diff --git a/conf/php-fpm.conf b/conf/php-fpm.conf
deleted file mode 100644
index 9b4aaa2..0000000
--- a/conf/php-fpm.conf
+++ /dev/null
@@ -1,422 +0,0 @@
-; Start a new pool named 'www'.
-; the variable $pool can be used in any directive and will be replaced by the
-; pool name ('www' here)
-[__NAMETOCHANGE__]
-
-; Per pool prefix
-; It only applies on the following directives:
-; - 'access.log'
-; - 'slowlog'
-; - 'listen' (unixsocket)
-; - 'chroot'
-; - 'chdir'
-; - 'php_values'
-; - 'php_admin_values'
-; When not set, the global prefix (or /usr) applies instead.
-; Note: This directive can also be relative to the global prefix.
-; Default Value: none
-;prefix = /path/to/pools/$pool
-
-; Unix user/group of processes
-; Note: The user is mandatory. If the group is not set, the default user's group
-;       will be used.
-user = __USER__
-group = __USER__
-
-; The address on which to accept FastCGI requests.
-; Valid syntaxes are:
-;   'ip.add.re.ss:port'    - to listen on a TCP socket to a specific IPv4 address on
-;                            a specific port;
-;   'port'                 - to listen on a TCP socket to all addresses on a
-;                            specific port;
-;   '[ip:6:addr:ess]:port' - to listen on a TCP socket to a specific IPv6 address on
-;                            a specific port;
-;   'port'                 - to listen on a TCP socket to all addresses
-;                            (IPv6 and IPv4-mapped) on a specific port;
-;   '/path/to/unix/socket' - to listen on a unix socket.
-; Note: This value is mandatory.
- listen = /var/run/php/php7.0-fpm-__NAMETOCHANGE__.sock
-
-; Set listen(2) backlog.
-; Default Value: 511 (-1 on FreeBSD and OpenBSD)
-;listen.backlog = 511
-
-; Set permissions for unix socket, if one is used. In Linux, read/write
-; permissions must be set in order to allow connections from a web server. Many
-; BSD-derived systems allow connections regardless of permissions.
-; Default Values: user and group are set as the running user
-;                 mode is set to 0660
-listen.owner = www-data
-listen.group = www-data
-;listen.mode = 0660
- 
-; When POSIX Access Control Lists are supported you can set them using
-; these options, value is a comma separated list of user/group names.
-; When set, listen.owner and listen.group are ignored
-;listen.acl_users =
-;listen.acl_groups =
-
-; List of addresses (IPv4/IPv6) of FastCGI clients which are allowed to connect.
-; Equivalent to the FCGI_WEB_SERVER_ADDRS environment variable in the original
-; PHP FCGI (5.2.2+). Makes sense only with a tcp listening socket. Each address
-; must be separated by a comma. If this value is left blank, connections will be
-; accepted from any ip address.
-; Default Value: any
-;listen.allowed_clients = 127.0.0.1
-
-; Specify the nice(2) priority to apply to the pool processes (only if set)
-; The value can vary from -19 (highest priority) to 20 (lower priority)
-; Note: - It will only work if the FPM master process is launched as root
-;       - The pool processes will inherit the master process priority
-;         unless it specified otherwise
-; Default Value: no set
-; process.priority = -19
-
-; Set the process dumpable flag (PR_SET_DUMPABLE prctl) even if the process user
-; or group is differrent than the master process user. It allows to create process
-; core dump and ptrace the process for the pool user.
-; Default Value: no
-; process.dumpable = yes
-
-; Choose how the process manager will control the number of child processes.
-; Possible Values:
-;   static  - a fixed number (pm.max_children) of child processes;
-;   dynamic - the number of child processes are set dynamically based on the
-;             following directives. With this process management, there will be
-;             always at least 1 children.
-;             pm.max_children      - the maximum number of children that can
-;                                    be alive at the same time.
-;             pm.start_servers     - the number of children created on startup.
-;             pm.min_spare_servers - the minimum number of children in 'idle'
-;                                    state (waiting to process). If the number
-;                                    of 'idle' processes is less than this
-;                                    number then some children will be created.
-;             pm.max_spare_servers - the maximum number of children in 'idle'
-;                                    state (waiting to process). If the number
-;                                    of 'idle' processes is greater than this
-;                                    number then some children will be killed.
-;  ondemand - no children are created at startup. Children will be forked when
-;             new requests will connect. The following parameter are used:
-;             pm.max_children           - the maximum number of children that
-;                                         can be alive at the same time.
-;             pm.process_idle_timeout   - The number of seconds after which
-;                                         an idle process will be killed.
-; Note: This value is mandatory.
-pm = dynamic
-
-; The number of child processes to be created when pm is set to 'static' and the
-; maximum number of child processes when pm is set to 'dynamic' or 'ondemand'.
-; This value sets the limit on the number of simultaneous requests that will be
-; served. Equivalent to the ApacheMaxClients directive with mpm_prefork.
-; Equivalent to the PHP_FCGI_CHILDREN environment variable in the original PHP
-; CGI. The below defaults are based on a server without much resources. Don't
-; forget to tweak pm.* to fit your needs.
-; Note: Used when pm is set to 'static', 'dynamic' or 'ondemand'
-; Note: This value is mandatory.
-pm.max_children = 10
-
-; The number of child processes created on startup.
-; Note: Used only when pm is set to 'dynamic'
-; Default Value: min_spare_servers + (max_spare_servers - min_spare_servers) / 2
-pm.start_servers = 2
-
-; The desired minimum number of idle server processes.
-; Note: Used only when pm is set to 'dynamic'
-; Note: Mandatory when pm is set to 'dynamic'
-pm.min_spare_servers = 1
-
-; The desired maximum number of idle server processes.
-; Note: Used only when pm is set to 'dynamic'
-; Note: Mandatory when pm is set to 'dynamic'
-pm.max_spare_servers = 3
-
-; The number of seconds after which an idle process will be killed.
-; Note: Used only when pm is set to 'ondemand'
-; Default Value: 10s
-;pm.process_idle_timeout = 10s;
-
-; The number of requests each child process should execute before respawning.
-; This can be useful to work around memory leaks in 3rd party libraries. For
-; endless request processing specify '0'. Equivalent to PHP_FCGI_MAX_REQUESTS.
-; Default Value: 0
-; pm.max_requests = 500
-
-; The URI to view the FPM status page. If this value is not set, no URI will be
-; recognized as a status page. It shows the following informations:
-;   pool                 - the name of the pool;
-;   process manager      - static, dynamic or ondemand;
-;   start time           - the date and time FPM has started;
-;   start since          - number of seconds since FPM has started;
-;   accepted conn        - the number of request accepted by the pool;
-;   listen queue         - the number of request in the queue of pending
-;                          connections (see backlog in listen(2));
-;   max listen queue     - the maximum number of requests in the queue
-;                          of pending connections since FPM has started;
-;   listen queue len     - the size of the socket queue of pending connections;
-;   idle processes       - the number of idle processes;
-;   active processes     - the number of active processes;
-;   total processes      - the number of idle + active processes;
-;   max active processes - the maximum number of active processes since FPM
-;                          has started;
-;   max children reached - number of times, the process limit has been reached,
-;                          when pm tries to start more children (works only for
-;                          pm 'dynamic' and 'ondemand');
-; Value are updated in real time.
-; Example output:
-;   pool:                 www
-;   process manager:      static
-;   start time:           01/Jul/2011:17:53:49 +0200
-;   start since:          62636
-;   accepted conn:        190460
-;   listen queue:         0
-;   max listen queue:     1
-;   listen queue len:     42
-;   idle processes:       4
-;   active processes:     11
-;   total processes:      15
-;   max active processes: 12
-;   max children reached: 0
-;
-; By default the status page output is formatted as text/plain. Passing either
-; 'html', 'xml' or 'json' in the query string will return the corresponding
-; output syntax. Example:
-;   http://www.foo.bar/status
-;   http://www.foo.bar/status?json
-;   http://www.foo.bar/status?html
-;   http://www.foo.bar/status?xml
-;
-; By default the status page only outputs short status. Passing 'full' in the
-; query string will also return status for each pool process.
-; Example:
-;   http://www.foo.bar/status?full
-;   http://www.foo.bar/status?json&full
-;   http://www.foo.bar/status?html&full
-;   http://www.foo.bar/status?xml&full
-; The Full status returns for each process:
-;   pid                  - the PID of the process;
-;   state                - the state of the process (Idle, Running, ...);
-;   start time           - the date and time the process has started;
-;   start since          - the number of seconds since the process has started;
-;   requests             - the number of requests the process has served;
-;   request duration     - the duration in µs of the requests;
-;   request method       - the request method (GET, POST, ...);
-;   request URI          - the request URI with the query string;
-;   content length       - the content length of the request (only with POST);
-;   user                 - the user (PHP_AUTH_USER) (or '-' if not set);
-;   script               - the main script called (or '-' if not set);
-;   last request cpu     - the %cpu the last request consumed
-;                          it's always 0 if the process is not in Idle state
-;                          because CPU calculation is done when the request
-;                          processing has terminated;
-;   last request memory  - the max amount of memory the last request consumed
-;                          it's always 0 if the process is not in Idle state
-;                          because memory calculation is done when the request
-;                          processing has terminated;
-; If the process is in Idle state, then informations are related to the
-; last request the process has served. Otherwise informations are related to
-; the current request being served.
-; Example output:
-;   ************************
-;   pid:                  31330
-;   state:                Running
-;   start time:           01/Jul/2011:17:53:49 +0200
-;   start since:          63087
-;   requests:             12808
-;   request duration:     1250261
-;   request method:       GET
-;   request URI:          /test_mem.php?N=10000
-;   content length:       0
-;   user:                 -
-;   script:               /home/fat/web/docs/php/test_mem.php
-;   last request cpu:     0.00
-;   last request memory:  0
-;
-; Note: There is a real-time FPM status monitoring sample web page available
-;       It's available in: /usr/share/php/7.0/fpm/status.html
-;
-; Note: The value must start with a leading slash (/). The value can be
-;       anything, but it may not be a good idea to use the .php extension or it
-;       may conflict with a real PHP file.
-; Default Value: not set 
-;pm.status_path = /status
- 
-; The ping URI to call the monitoring page of FPM. If this value is not set, no
-; URI will be recognized as a ping page. This could be used to test from outside
-; that FPM is alive and responding, or to
-; - create a graph of FPM availability (rrd or such);
-; - remove a server from a group if it is not responding (load balancing);
-; - trigger alerts for the operating team (24/7).
-; Note: The value must start with a leading slash (/). The value can be
-;       anything, but it may not be a good idea to use the .php extension or it
-;       may conflict with a real PHP file.
-; Default Value: not set
-;ping.path = /ping
-
-; This directive may be used to customize the response of a ping request. The
-; response is formatted as text/plain with a 200 response code.
-; Default Value: pong
-;ping.response = pong
-
-; The access log file
-; Default: not set
-;access.log = log/$pool.access.log
-
-; The access log format.
-; The following syntax is allowed
-;  %%: the '%' character
-;  %C: %CPU used by the request
-;      it can accept the following format:
-;      - %{user}C for user CPU only
-;      - %{system}C for system CPU only
-;      - %{total}C  for user + system CPU (default)
-;  %d: time taken to serve the request
-;      it can accept the following format:
-;      - %{seconds}d (default)
-;      - %{miliseconds}d
-;      - %{mili}d
-;      - %{microseconds}d
-;      - %{micro}d
-;  %e: an environment variable (same as $_ENV or $_SERVER)
-;      it must be associated with embraces to specify the name of the env
-;      variable. Some exemples:
-;      - server specifics like: %{REQUEST_METHOD}e or %{SERVER_PROTOCOL}e
-;      - HTTP headers like: %{HTTP_HOST}e or %{HTTP_USER_AGENT}e
-;  %f: script filename
-;  %l: content-length of the request (for POST request only)
-;  %m: request method
-;  %M: peak of memory allocated by PHP
-;      it can accept the following format:
-;      - %{bytes}M (default)
-;      - %{kilobytes}M
-;      - %{kilo}M
-;      - %{megabytes}M
-;      - %{mega}M
-;  %n: pool name
-;  %o: output header
-;      it must be associated with embraces to specify the name of the header:
-;      - %{Content-Type}o
-;      - %{X-Powered-By}o
-;      - %{Transfert-Encoding}o
-;      - ....
-;  %p: PID of the child that serviced the request
-;  %P: PID of the parent of the child that serviced the request
-;  %q: the query string
-;  %Q: the '?' character if query string exists
-;  %r: the request URI (without the query string, see %q and %Q)
-;  %R: remote IP address
-;  %s: status (response code)
-;  %t: server time the request was received
-;      it can accept a strftime(3) format:
-;      %d/%b/%Y:%H:%M:%S %z (default)
-;      The strftime(3) format must be encapsuled in a %{<strftime_format>}t tag
-;      e.g. for a ISO8601 formatted timestring, use: %{%Y-%m-%dT%H:%M:%S%z}t
-;  %T: time the log has been written (the request has finished)
-;      it can accept a strftime(3) format:
-;      %d/%b/%Y:%H:%M:%S %z (default)
-;      The strftime(3) format must be encapsuled in a %{<strftime_format>}t tag
-;      e.g. for a ISO8601 formatted timestring, use: %{%Y-%m-%dT%H:%M:%S%z}t
-;  %u: remote user
-;
-; Default: "%R - %u %t \"%m %r\" %s"
-; access.format = "%R - %u %t \"%m %r%Q%q\" %s %f %{mili}d %{kilo}M %C%%"
-
-; The log file for slow requests
-; Default Value: not set
-; Note: slowlog is mandatory if request_slowlog_timeout is set
-; slowlog = log/$pool.log.slow
-
-; The timeout for serving a single request after which a PHP backtrace will be
-; dumped to the 'slowlog' file. A value of '0s' means 'off'.
-; Available units: s(econds)(default), m(inutes), h(ours), or d(ays)
-; Default Value: 0
-;request_slowlog_timeout = 0
-
-; The timeout for serving a single request after which the worker process will
-; be killed. This option should be used when the 'max_execution_time' ini option
-; does not stop script execution for some reason. A value of '0' means 'off'.
-; Available units: s(econds)(default), m(inutes), h(ours), or d(ays)
-; Default Value: 0
-request_terminate_timeout = 1d
-
-; Set open file descriptor rlimit.
-; Default Value: system defined value
-;rlimit_files = 1024
-
-; Set max core size rlimit.
-; Possible Values: 'unlimited' or an integer greater or equal to 0
-; Default Value: system defined value
-;rlimit_core = 0
-
-; Chroot to this directory at the start. This value must be defined as an
-; absolute path. When this value is not set, chroot is not used.
-; Note: you can prefix with '$prefix' to chroot to the pool prefix or one
-; of its subdirectories. If the pool prefix is not set, the global prefix
-; will be used instead.
-; Note: chrooting is a great security feature and should be used whenever
-;       possible. However, all PHP paths will be relative to the chroot
-;       (error_log, sessions.save_path, ...).
-; Default Value: not set
-;chroot = 
- 
-; Chdir to this directory at the start.
-; Note: relative path can be used.
-; Default Value: current directory or / when chroot
-chdir = __FINALPATH__
- 
-; Redirect worker stdout and stderr into main error log. If not set, stdout and
-; stderr will be redirected to /dev/null according to FastCGI specs.
-; Note: on highloaded environement, this can cause some delay in the page
-; process time (several ms).
-; Default Value: no
-;catch_workers_output = yes
-
-; Clear environment in FPM workers
-; Prevents arbitrary environment variables from reaching FPM worker processes
-; by clearing the environment in workers before env vars specified in this
-; pool configuration are added.
-; Setting to "no" will make all environment variables available to PHP code
-; via getenv(), $_ENV and $_SERVER.
-; Default Value: yes
-;clear_env = no
-
-; Limits the extensions of the main script FPM will allow to parse. This can
-; prevent configuration mistakes on the web server side. You should only limit
-; FPM to .php extensions to prevent malicious users to use other extensions to
-; execute php code.
-; Note: set an empty value to allow all extensions.
-; Default Value: .php
-;security.limit_extensions = .php .php3 .php4 .php5 .php7
-
-; Pass environment variables like LD_LIBRARY_PATH. All $VARIABLEs are taken from
-; the current environment.
-; Default Value: clean env
-;env[HOSTNAME] = $HOSTNAME
-;env[PATH] = /usr/local/bin:/usr/bin:/bin
-;env[TMP] = /tmp
-;env[TMPDIR] = /tmp
-;env[TEMP] = /tmp
-
-; Additional php.ini defines, specific to this pool of workers. These settings
-; overwrite the values previously defined in the php.ini. The directives are the
-; same as the PHP SAPI:
-;   php_value/php_flag             - you can set classic ini defines which can
-;                                    be overwritten from PHP call 'ini_set'.
-;   php_admin_value/php_admin_flag - these directives won't be overwritten by
-;                                     PHP call 'ini_set'
-; For php_*flag, valid values are on, off, 1, 0, true, false, yes or no.
-
-; Defining 'extension' will load the corresponding shared extension from
-; extension_dir. Defining 'disable_functions' or 'disable_classes' will not
-; overwrite previously defined php.ini values, but will append the new value
-; instead.
-
-; Note: path INI options can be relative and will be expanded with the prefix
-; (pool, global or /usr)
-
-; Default Value: nothing is defined by default except the values in php.ini and
-;                specified at startup with the -d argument
-;php_admin_value[sendmail_path] = /usr/sbin/sendmail -t -i -f www@my.domain.com
-;php_flag[display_errors] = off
-;php_admin_value[error_log] = /var/log/fpm-php.www.log
-;php_admin_flag[log_errors] = on
-;php_admin_value[memory_limit] = 32M
diff --git a/config_panel.json b/config_panel.json
index b4454ae..e605e61 100644
--- a/config_panel.json
+++ b/config_panel.json
@@ -42,6 +42,33 @@
 				"type": "bool",
 				"default": true
 			}]
+		},
+		{
+			"name": "PHP-FPM configuration",
+			"id": "php_fpm_config",
+			"options": [{
+				"name": "Memory footprint of the service ?",
+				"help": "low <= 20Mb per pool. medium between 20Mb and 40Mb per pool. high > 40Mb per pool. Use specific to set a value with the following option.\n<br>We can't use a choices field for now. In the meantime please choose between one of this values:\n<br>low, medium, high, specific.",
+				"id": "footprint",
+				"type": "text",
+				"//": "\"choices\" : [\"low\", \"medium\", \"high\", \"specific\"]",
+				"default" : "low"
+			},
+			{
+				"name": "Memory footprint of the service ?",
+				"help": "Free field to specify exactly the footprint in Mb if you don't want to use one of the three previous values.",
+				"id": "free_footprint",
+				"type": "number",
+				"default": 0
+			},
+			{
+				"name": "Expected usage of the service ?",
+				"help": "low: Personal usage, behind the sso. No RAM footprint when not used, but the impact on the processor can be high if many users are using the service.\n<br>medium: Low usage, few people or/and publicly accessible. Low RAM footprint, medium processor footprint when used.\n<br>high: High usage, frequently visited website. High RAM footprint, but lower on processor usage and quickly responding.\n<br>We can't use a choices field for now. In the meantime please choose between one of this values:\n<br>low, medium, high.",
+				"id": "usage",
+				"type": "text",
+				"//": "\"choices\" : [\"low\", \"medium\", \"high\"]",
+				"default" : "low"
+			}]
 		}]
 	}
 ]
diff --git a/scripts/_common.sh b/scripts/_common.sh
index 836436f..1176ffc 100755
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -1,5 +1,9 @@
 #!/bin/bash
 
+#=================================================
+# PERSONAL HELPERS
+#=================================================
+
 #=================================================
 # BACKUP
 #=================================================
@@ -384,72 +388,6 @@ ynh_maintenance_mode_OFF () {
 
 #=================================================
 
-# Download and check integrity of a file from app.src_file
-#
-# The file conf/app.src_file need to contains:
-#
-# FILE_URL=Address to download the file
-# FILE_SUM=Control sum
-# # (Optional) Program to check the integrity (sha256sum, md5sum...)
-# # default: sha256
-# FILE_SUM_PRG=sha256
-# # (Optionnal) Name of the local archive (offline setup support)
-# # default: Name of the downloaded file.
-# FILENAME=example.deb
-#
-# usage: ynh_download_file --dest_dir="/destination/directory" [--source_id=myfile]
-# | arg: -d, --dest_dir=  - Directory where to download the file
-# | arg: -s, --source_id= - Name of the source file 'app.src_file' if it isn't '$app'
-ynh_download_file () {
-	# Declare an array to define the options of this helper.
-	declare -Ar args_array=( [d]=dest_dir= [s]=source_id= )
-	local dest_dir
-	local source_id
-	# Manage arguments with getopts
-	ynh_handle_getopts_args "$@"
-
-	source_id=${source_id:-app} # If the argument is not given, source_id equals "$app"
-
-	# Load value from configuration file (see above for a small doc about this file
-	# format)
-	local src_file="$YNH_CWD/../conf/${source_id}.src_file"
-	# If the src_file doesn't exist, use the backup path instead, with a "settings" directory
-	if [ ! -e "$src_file" ]
-	then
-		src_file="$YNH_CWD/../settings/conf/${source_id}.src_file"
-	fi
-	local file_url=$(grep 'FILE_URL=' "$src_file" | cut -d= -f2-)
-	local file_sum=$(grep 'FILE_SUM=' "$src_file" | cut -d= -f2-)
-	local file_sumprg=$(grep 'FILE_SUM_PRG=' "$src_file" | cut -d= -f2-)
-	local filename=$(grep 'FILENAME=' "$src_file" | cut -d= -f2-)
-
-	# Default value
-	file_sumprg=${file_sumprg:-sha256sum}
-	if [ "$filename" = "" ] ; then
-		filename="$(basename "$file_url")"
-	fi
-	local local_src="/opt/yunohost-apps-src/${YNH_APP_ID}/${filename}"
-
-	if test -e "$local_src"
-	then    # Use the local source file if it is present
-		cp $local_src $filename
-	else    # If not, download the source
-		local out=`wget -nv -O $filename $file_url 2>&1` || ynh_print_err $out
-	fi
-
-	# Check the control sum
-	echo "${file_sum} ${filename}" | ${file_sumprg} -c --status \
-		|| ynh_die "Corrupt file"
-
-	# Create the destination directory, if it's not already.
-	mkdir -p "$dest_dir"
-
-	# Move the file to its destination
-	mv $filename $dest_dir
-}
-
-#=================================================
-
 # Create a changelog for an app after an upgrade.
 #
 # The changelog is printed into the file ./changelog for the time of the upgrade.
@@ -509,3 +447,231 @@ ynh_app_changelog () {
 		sed -in-place "s@\*(\([[:alnum:]]*\)) -> \(.*\)@* __URL_TAG1__\2__URL_TAG2__${repo}/commit/\1__URL_TAG3__@g" changelog
  	fi
 }
+
+#=================================================
+
+# Check the amount of available RAM
+#
+# usage: ynh_check_ram [--required=RAM required in Mb] [--no_swap|--only_swap] [--free_ram]
+# | arg: -r, --required= - Amount of RAM required in Mb. The helper will return 0 is there's enough RAM, or 1 otherwise.
+# If --required isn't set, the helper will print the amount of RAM, in Mb.
+# | arg: -s, --no_swap   - Ignore swap
+# | arg: -o, --only_swap - Ignore real RAM, consider only swap.
+# | arg: -f, --free_ram  - Count only free RAM, not the total amount of RAM available.
+ynh_check_ram () {
+	# Declare an array to define the options of this helper.
+	declare -Ar args_array=( [r]=required= [s]=no_swap [o]=only_swap [f]=free_ram )
+	local required
+	local no_swap
+	local only_swap
+	# Manage arguments with getopts
+	ynh_handle_getopts_args "$@"
+	required=${required:-}
+	no_swap=${no_swap:-0}
+	only_swap=${only_swap:-0}
+
+	local total_ram=$(vmstat --stats --unit M | grep "total memory" | awk '{print $1}')
+	local total_swap=$(vmstat --stats --unit M | grep "total swap" | awk '{print $1}')
+	local total_ram_swap=$(( total_ram + total_swap ))
+
+	local free_ram=$(vmstat --stats --unit M | grep "free memory" | awk '{print $1}')
+	local free_swap=$(vmstat --stats --unit M | grep "free swap" | awk '{print $1}')
+	local free_ram_swap=$(( free_ram + free_swap ))
+
+	# Use the total amount of ram
+	local ram=$total_ram_swap
+	if [ $free_ram -eq 1 ]
+	then
+		# Use the total amount of free ram
+		ram=$free_ram_swap
+		if [ $no_swap -eq 1 ]
+		then
+			# Use only the amount of free ram
+			ram=$free_ram
+		elif [ $only_swap -eq 1 ]
+		then
+			# Use only the amount of free swap
+			ram=$free_swap
+		fi
+	else
+		if [ $no_swap -eq 1 ]
+		then
+			# Use only the amount of free ram
+			ram=$total_ram
+		elif [ $only_swap -eq 1 ]
+		then
+			# Use only the amount of free swap
+			ram=$total_swap
+		fi
+	fi
+
+	if [ -n "$required" ]
+	then
+		# Return 1 if the amount of ram isn't enough.
+		if [ $ram -lt $required ]
+		then
+			return 1
+		else
+			return 0
+		fi
+
+	# If no RAM is required, return the amount of available ram.
+	else
+		echo $ram
+	fi
+}
+
+#=================================================
+
+# Define the values to configure php-fpm
+#
+# usage: ynh_get_scalable_phpfpm --usage=usage --footprint=footprint [--print]
+# | arg: -f, --footprint      - Memory footprint of the service (low/medium/high).
+# low    - Less than 20Mb of ram by pool.
+# medium - Between 20Mb and 40Mb of ram by pool.
+# high   - More than 40Mb of ram by pool.
+# Or specify exactly the footprint, the load of the service as Mb by pool instead of having a standard value.
+# To have this value, use the following command and stress the service.
+# watch -n0.5 ps -o user,cmd,%cpu,rss -u APP
+#
+# | arg: -u, --usage     - Expected usage of the service (low/medium/high).
+# low    - Personal usage, behind the sso.
+# medium - Low usage, few people or/and publicly accessible.
+# high   - High usage, frequently visited website.
+#
+# | arg: -p, --print - Print the result
+#
+#
+#
+# The footprint of the service will be used to defined the maximum footprint we can allow, which is half the maximum RAM.
+# So it will be used to defined 'pm.max_children'
+# A lower value for the footprint will allow more children for 'pm.max_children'. And so for
+#    'pm.start_servers', 'pm.min_spare_servers' and 'pm.max_spare_servers' which are defined from the
+#    value of 'pm.max_children'
+# NOTE: 'pm.max_children' can't exceed 4 times the number of processor's cores.
+#
+# The usage value will defined the way php will handle the children for the pool.
+# A value set as 'low' will set the process manager to 'ondemand'. Children will start only if the
+#   service is used, otherwise no child will stay alive. This config gives the lower footprint when the
+#   service is idle. But will use more proc since it has to start a child as soon it's used.
+# Set as 'medium', the process manager will be at dynamic. If the service is idle, a number of children
+#   equal to pm.min_spare_servers will stay alive. So the service can be quick to answer to any request.
+#   The number of children can grow if needed. The footprint can stay low if the service is idle, but
+#   not null. The impact on the proc is a little bit less than 'ondemand' as there's always a few
+#   children already available.
+# Set as 'high', the process manager will be set at 'static'. There will be always as many children as
+#   'pm.max_children', the footprint is important (but will be set as maximum a quarter of the maximum
+#   RAM) but the impact on the proc is lower. The service will be quick to answer as there's always many
+#   children ready to answer.
+ynh_get_scalable_phpfpm () {
+    local legacy_args=ufp
+    # Declare an array to define the options of this helper.
+    declare -Ar args_array=( [u]=usage= [f]=footprint= [p]=print )
+    local usage
+    local footprint
+    local print
+    # Manage arguments with getopts
+    ynh_handle_getopts_args "$@"
+    # Set all characters as lowercase
+    footprint=${footprint,,}
+    usage=${usage,,}
+    print=${print:-0}
+
+    if [ "$footprint" = "low" ]
+    then
+        footprint=20
+    elif [ "$footprint" = "medium" ]
+    then
+        footprint=35
+    elif [ "$footprint" = "high" ]
+    then
+        footprint=50
+    fi
+
+    # Define the way the process manager handle child processes.
+    if [ "$usage" = "low" ]
+    then
+        php_pm=ondemand
+    elif [ "$usage" = "medium" ]
+    then
+        php_pm=dynamic
+    elif [ "$usage" = "high" ]
+    then
+        php_pm=static
+    else
+        ynh_die --message="Does not recognize '$usage' as an usage value."
+    fi
+
+    # Get the total of RAM available, except swap.
+    local max_ram=$(ynh_check_ram --no_swap)
+
+    less0() {
+        # Do not allow value below 1
+        if [ $1 -le 0 ]
+        then
+            echo 1
+        else
+            echo $1
+        fi
+    }
+
+    # Define pm.max_children
+    # The value of pm.max_children is the total amount of ram divide by 2 and divide again by the footprint of a pool for this app.
+    # So if php-fpm start the maximum of children, it won't exceed half of the ram.
+    php_max_children=$(( $max_ram / 2 / $footprint ))
+    # If process manager is set as static, use half less children.
+    # Used as static, there's always as many children as the value of pm.max_children
+    if [ "$php_pm" = "static" ]
+    then
+        php_max_children=$(( $php_max_children / 2 ))
+    fi
+    php_max_children=$(less0 $php_max_children)
+
+    # To not overload the proc, limit the number of children to 4 times the number of cores.
+    local core_number=$(nproc)
+    local max_proc=$(( $core_number * 4 ))
+    if [ $php_max_children -gt $max_proc ]
+    then
+        php_max_children=$max_proc
+    fi
+
+    if [ "$php_pm" = "dynamic" ]
+    then
+        # Define pm.start_servers, pm.min_spare_servers and pm.max_spare_servers for a dynamic process manager
+        php_min_spare_servers=$(( $php_max_children / 8 ))
+        php_min_spare_servers=$(less0 $php_min_spare_servers)
+
+        php_max_spare_servers=$(( $php_max_children / 2 ))
+        php_max_spare_servers=$(less0 $php_max_spare_servers)
+
+        php_start_servers=$(( $php_min_spare_servers + ( $php_max_spare_servers - $php_min_spare_servers ) /2 ))
+        php_start_servers=$(less0 $php_start_servers)
+    else
+        php_min_spare_servers=0
+        php_max_spare_servers=0
+        php_start_servers=0
+    fi
+
+    if [ $print -eq 1 ]
+    then
+        ynh_debug --message="Footprint=${footprint}Mb by pool."
+        ynh_debug --message="Process manager=$php_pm"
+        ynh_debug --message="Max RAM=${max_ram}Mb"
+        if [ "$php_pm" != "static" ]; then
+            ynh_debug --message="\nMax estimated footprint=$(( $php_max_children * $footprint ))"
+            ynh_debug --message="Min estimated footprint=$(( $php_min_spare_servers * $footprint ))"
+        fi
+        if [ "$php_pm" = "dynamic" ]; then
+            ynh_debug --message="Estimated average footprint=$(( $php_max_spare_servers * $footprint ))"
+        elif [ "$php_pm" = "static" ]; then
+            ynh_debug --message="Estimated footprint=$(( $php_max_children * $footprint ))"
+        fi
+        ynh_debug --message="\nRaw php-fpm values:"
+        ynh_debug --message="pm.max_children = $php_max_children"
+        if [ "$php_pm" = "dynamic" ]; then
+            ynh_debug --message="pm.start_servers = $php_start_servers"
+            ynh_debug --message="pm.min_spare_servers = $php_min_spare_servers"
+            ynh_debug --message="pm.max_spare_servers = $php_max_spare_servers"
+        fi
+    fi
+}
diff --git a/scripts/_ynh_add_fpm_config b/scripts/_ynh_add_fpm_config
new file mode 100644
index 0000000..8d36834
--- /dev/null
+++ b/scripts/_ynh_add_fpm_config
@@ -0,0 +1,132 @@
+#!/bin/bash
+
+# Create a dedicated php-fpm config
+#
+# usage 1: ynh_add_fpm_config [--phpversion=7.X] [--use_template]
+# | arg: -v, --phpversion - Version of php to use.
+# | arg: -t, --use_template - Use this helper in template mode.
+#
+# -----------------------------------------------------------------------------
+#
+# usage 2: ynh_add_fpm_config [--phpversion=7.X] --usage=usage --footprint=footprint
+# | arg: -v, --phpversion - Version of php to use.#
+# | arg: -f, --footprint      - Memory footprint of the service (low/medium/high).
+# low    - Less than 20Mb of ram by pool.
+# medium - Between 20Mb and 40Mb of ram by pool.
+# high   - More than 40Mb of ram by pool.
+# Or specify exactly the footprint, the load of the service as Mb by pool instead of having a standard value.
+# To have this value, use the following command and stress the service.
+# watch -n0.5 ps -o user,cmd,%cpu,rss -u APP
+#
+# | arg: -u, --usage     - Expected usage of the service (low/medium/high).
+# low    - Personal usage, behind the sso.
+# medium - Low usage, few people or/and publicly accessible.
+# high   - High usage, frequently visited website.
+#
+# Requires YunoHost version 2.7.2 or higher.
+ynh_add_fpm_config () {
+	# Declare an array to define the options of this helper.
+	local legacy_args=vtuf
+	declare -Ar args_array=( [v]=phpversion= [t]=use_template [u]=usage= [f]=footprint= )
+	local phpversion
+    local use_template
+    local usage
+    local footprint
+	# Manage arguments with getopts
+	ynh_handle_getopts_args "$@"
+	# The default behaviour is to use the template.
+    use_template="${use_template:-1}"
+    usage="${usage:-}"
+    footprint="${footprint:-}"
+    if [ -n "$usage" ] || [ -n "$footprint" ]; then
+        use_template=0
+    fi
+
+	# Configure PHP-FPM 7.0 by default
+	phpversion="${phpversion:-7.0}"
+
+	local fpm_config_dir="/etc/php/$phpversion/fpm"
+	local fpm_service="php${phpversion}-fpm"
+	# Configure PHP-FPM 5 on Debian Jessie
+	if [ "$(ynh_get_debian_release)" == "jessie" ]; then
+		fpm_config_dir="/etc/php5/fpm"
+		fpm_service="php5-fpm"
+	fi
+	ynh_app_setting_set --app=$app --key=fpm_config_dir --value="$fpm_config_dir"
+	ynh_app_setting_set --app=$app --key=fpm_service --value="$fpm_service"
+	finalphpconf="$fpm_config_dir/pool.d/$app.conf"
+	ynh_backup_if_checksum_is_different --file="$finalphpconf"
+
+	if [ $use_template -eq 1 ]
+	then
+        # Usage 1, use the template in ../conf/php-fpm.conf
+        sudo cp ../conf/php-fpm.conf "$finalphpconf"
+        ynh_replace_string --match_string="__NAMETOCHANGE__" --replace_string="$app" --target_file="$finalphpconf"
+        ynh_replace_string --match_string="__FINALPATH__" --replace_string="$final_path" --target_file="$finalphpconf"
+        ynh_replace_string --match_string="__USER__" --replace_string="$app" --target_file="$finalphpconf"
+        ynh_replace_string --match_string="__PHPVERSION__" --replace_string="$phpversion" --target_file="$finalphpconf"
+
+	else
+        # Store settings
+        ynh_app_setting_set --app=$app --key=fpm_footprint --value=$footprint
+        ynh_app_setting_set --app=$app --key=fpm_usage --value=$usage
+
+        # Usage 2, generate a php-fpm config file with ynh_get_scalable_phpfpm
+        ynh_get_scalable_phpfpm --usage=$usage --footprint=$footprint
+
+        # Copy the default file
+        sudo cp "$fpm_config_dir/pool.d/www.conf" "$finalphpconf"
+
+        # Replace standard variables into the default file
+        ynh_replace_string --match_string="^\[www\]" --replace_string="[$app]" --target_file="$finalphpconf"
+        ynh_replace_string --match_string=".*listen = .*" --replace_string="listen = /var/run/php/php7.0-fpm-$app.sock" --target_file="$finalphpconf"
+        ynh_replace_string --match_string="^user = .*" --replace_string="user = $app" --target_file="$finalphpconf"
+        ynh_replace_string --match_string="^group = .*" --replace_string="group = $app" --target_file="$finalphpconf"
+        ynh_replace_string --match_string=".*chdir = .*" --replace_string="chdir = $final_path" --target_file="$finalphpconf"
+
+        # Configure fpm children
+        ynh_replace_string --match_string=".*pm = .*" --replace_string="pm = $php_pm" --target_file="$finalphpconf"
+        ynh_replace_string --match_string=".*pm.max_children = .*" --replace_string="pm.max_children = $php_max_children" --target_file="$finalphpconf"
+        ynh_replace_string --match_string=".*pm.max_requests = .*" --replace_string="pm.max_requests = 500" --target_file="$finalphpconf"
+        ynh_replace_string --match_string=".*request_terminate_timeout = .*" --replace_string="request_terminate_timeout = 1d" --target_file="$finalphpconf"
+        if [ "$php_pm" = "dynamic" ]
+        then
+            ynh_replace_string --match_string=".*pm.start_servers = .*" --replace_string="pm.start_servers = $php_start_servers" --target_file="$finalphpconf"
+            ynh_replace_string --match_string=".*pm.min_spare_servers = .*" --replace_string="pm.min_spare_servers = $php_min_spare_servers" --target_file="$finalphpconf"
+            ynh_replace_string --match_string=".*pm.max_spare_servers = .*" --replace_string="pm.max_spare_servers = $php_max_spare_servers" --target_file="$finalphpconf"
+        elif [ "$php_pm" = "ondemand" ]
+        then
+            ynh_replace_string --match_string=".*pm.process_idle_timeout = .*" --replace_string="pm.process_idle_timeout = 10s" --target_file="$finalphpconf"
+        fi
+
+        # Comment unused parameters
+        if [ "$php_pm" != "dynamic" ]
+        then
+            ynh_replace_string --match_string=".*\(pm.start_servers = .*\)" --replace_string=";\1" --target_file="$finalphpconf"
+            ynh_replace_string --match_string=".*\(pm.min_spare_servers = .*\)" --replace_string=";\1" --target_file="$finalphpconf"
+            ynh_replace_string --match_string=".*\(pm.max_spare_servers = .*\)" --replace_string=";\1" --target_file="$finalphpconf"
+        fi
+        if [ "$php_pm" != "ondemand" ]
+        then
+            ynh_replace_string --match_string=".*\(pm.process_idle_timeout = .*\)" --replace_string=";\1" --target_file="$finalphpconf"
+        fi
+
+        # Concatene the extra config.
+        if [ -e ../conf/extra_php-fpm.conf ]; then
+            cat ../conf/extra_php-fpm.conf >> "$finalphpconf"
+        fi
+	fi
+	sudo chown root: "$finalphpconf"
+	ynh_store_file_checksum --file="$finalphpconf"
+
+	if [ -e "../conf/php-fpm.ini" ]
+	then
+		echo "Packagers ! Please do not use a separate php ini file, merge your directives in the pool file instead." >&2
+		finalphpini="$fpm_config_dir/conf.d/20-$app.ini"
+		ynh_backup_if_checksum_is_different "$finalphpini"
+		sudo cp ../conf/php-fpm.ini "$finalphpini"
+		sudo chown root: "$finalphpini"
+		ynh_store_file_checksum "$finalphpini"
+	fi
+	ynh_systemd_action --service_name=$fpm_service --action=reload
+}
diff --git a/scripts/actions/public_private b/scripts/actions/public_private
index 5fb5c62..ebe0cc8 100755
--- a/scripts/actions/public_private
+++ b/scripts/actions/public_private
@@ -30,7 +30,7 @@ is_public_old=$(ynh_app_setting_get --app=$app --key=is_public)
 
 if [ $is_public -eq $is_public_old ]
 then
-	ynh_die --message="is_public is already set as $is_public." 0
+	ynh_die --message="is_public is already set as $is_public." --ret_code=0
 fi
 
 #=================================================
diff --git a/scripts/config b/scripts/config
index 66aea11..f0785cc 100644
--- a/scripts/config
+++ b/scripts/config
@@ -8,6 +8,7 @@
 
 source _common.sh
 source /usr/share/yunohost/helpers
+source _ynh_add_fpm_config
 
 #=================================================
 # RETRIEVE ARGUMENTS
@@ -31,6 +32,7 @@ old_is_public="$(ynh_app_setting_get --app=$app --key=is_public)"
 old_is_public=$(bool_to_true_false $old_is_public)
 is_public="${YNH_CONFIG_MAIN_IS_PUBLIC_IS_PUBLIC:-$old_is_public}"
 
+
 # Overwrite nginx configuration
 old_overwrite_nginx="$(ynh_app_setting_get --app=$app --key=overwrite_nginx)"
 old_overwrite_nginx=$(bool_to_true_false $old_overwrite_nginx)
@@ -41,11 +43,32 @@ old_overwrite_phpfpm="$(ynh_app_setting_get --app=$app --key=overwrite_phpfpm)"
 old_overwrite_phpfpm=$(bool_to_true_false $old_overwrite_phpfpm)
 overwrite_phpfpm="${YNH_CONFIG_MAIN_OVERWRITE_FILES_OVERWRITE_PHPFPM:-$old_overwrite_phpfpm}"
 
+
 # Type of admin mail configuration
 old_admin_mail_html="$(ynh_app_setting_get --app=$app --key=admin_mail_html)"
 old_admin_mail_html=$(bool_to_true_false $old_admin_mail_html)
 admin_mail_html="${YNH_CONFIG_MAIN_GLOBAL_CONFIG_EMAIL_TYPE:-$old_admin_mail_html}"
 
+
+# Footprint for php-fpm
+old_fpm_footprint="$(ynh_app_setting_get --app=$app --key=fpm_footprint)"
+fpm_footprint="${YNH_CONFIG_MAIN_PHP_FPM_CONFIG_FOOTPRINT:-$old_fpm_footprint}"
+
+# Free footprint value for php-fpm
+# Check if fpm_footprint is an integer
+if [ "$fpm_footprint" -eq "$fpm_footprint" ] 2> /dev/null
+then
+    # If fpm_footprint is an integer, that's a numeric value for the footprint
+    old_free_footprint=$fpm_footprint
+else
+    old_free_footprint=0
+fi
+free_footprint="${YNH_CONFIG_MAIN_PHP_FPM_CONFIG_FREE_FOOTPRINT:-$old_free_footprint}"
+
+# Usage for php-fpm
+old_fpm_usage="$(ynh_app_setting_get --app=$app --key=fpm_usage)"
+fpm_usage="${YNH_CONFIG_MAIN_PHP_FPM_CONFIG_USAGE:-$old_fpm_usage}"
+
 #=================================================
 # SHOW_CONFIG FUNCTION FOR 'SHOW' COMMAND
 #=================================================
@@ -60,6 +83,10 @@ show_config() {
 	echo "YNH_CONFIG_MAIN_OVERWRITE_FILES_OVERWRITE_PHPFPM=$overwrite_phpfpm"
 
 	echo "YNH_CONFIG_MAIN_GLOBAL_CONFIG_EMAIL_TYPE=$admin_mail_html"
+
+	echo "YNH_CONFIG_MAIN_PHP_FPM_CONFIG_FOOTPRINT=$fpm_footprint"
+	echo "YNH_CONFIG_MAIN_PHP_FPM_CONFIG_FREE_FOOTPRINT=$free_footprint"
+	echo "YNH_CONFIG_MAIN_PHP_FPM_CONFIG_USAGE=$fpm_usage"
 }
 
 #=================================================
@@ -67,6 +94,11 @@ show_config() {
 #=================================================
 
 apply_config() {
+
+    #=================================================
+    # MODIFY PUBLIC ACCESSIBILITY
+    #=================================================
+
 	# Change public accessibility
 	if [ "$is_public" = "true" ]
 	then
@@ -75,6 +107,10 @@ apply_config() {
 		yunohost app action run $app public_private --args is_public=0
 	fi
 
+    #=================================================
+    # MODIFY OVERWRITTING SETTINGS
+    #=================================================
+
 	# Set overwrite_nginx
 	overwrite_nginx=$(bool_to_01 $overwrite_nginx)
 	ynh_app_setting_set --app=$app --key=overwrite_nginx --value="$overwrite_nginx"
@@ -82,9 +118,22 @@ apply_config() {
 	overwrite_phpfpm=$(bool_to_01 $overwrite_phpfpm)
 	ynh_app_setting_set --app=$app --key=overwrite_phpfpm --value="$overwrite_phpfpm"
 
+    #=================================================
+    # MODIFY EMAIL SETTING
+    #=================================================
+
 	# Set admin_mail_html
 	admin_mail_html=$(bool_to_01 $admin_mail_html)
 	ynh_app_setting_set --app=$app --key=admin_mail_html --value="$admin_mail_html"
+
+    #=================================================
+    # RECONFIGURE PHP-FPM
+    #=================================================
+
+    if [ "$fpm_usage" != "$old_fpm_usage" ] || [ "$fpm_footprint" != "$old_fpm_footprint" ]
+    then
+        ynh_add_fpm_config --usage=$fpm_usage --footprint=$fpm_footprint
+    fi
 }
 
 #=================================================
diff --git a/scripts/install b/scripts/install
index 414a1d0..5401721 100644
--- a/scripts/install
+++ b/scripts/install
@@ -8,6 +8,7 @@
 
 source _common.sh
 source /usr/share/yunohost/helpers
+source _ynh_add_fpm_config
 
 #=================================================
 # MANAGE FAILURE OF THE SCRIPT
@@ -95,7 +96,7 @@ ynh_system_user_create --username=$app
 ynh_script_progression --message="Configuring php-fpm..." --weight=2
 
 # Create a dedicated php-fpm config
-ynh_add_fpm_config
+ynh_add_fpm_config --usage=low --footprint=low
 
 #=================================================
 # SPECIFIC SETUP
diff --git a/scripts/upgrade b/scripts/upgrade
index eee1ec6..8e6a0e8 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -8,6 +8,7 @@
 
 source _common.sh
 source /usr/share/yunohost/helpers
+source _ynh_add_fpm_config
 
 #=================================================
 # LOAD SETTINGS
@@ -28,6 +29,9 @@ overwrite_nginx=$(ynh_app_setting_get --app=$app --key=overwrite_nginx)
 overwrite_phpfpm=$(ynh_app_setting_get --app=$app --key=overwrite_phpfpm)
 admin_mail_html=$(ynh_app_setting_get --app=$app --key=admin_mail_html)
 
+fpm_footprint=$(ynh_app_setting_get --app=$app --key=fpm_footprint)
+fpm_usage=$(ynh_app_setting_get --app=$app --key=fpm_usage)
+
 #=================================================
 # CHECK VERSION
 #=================================================
@@ -160,7 +164,7 @@ if [ $overwrite_phpfpm -eq 1 ]
 then
 	ynh_script_progression --message="Upgrading php-fpm configuration..." --weight=2
 	# Create a dedicated php-fpm config
-	ynh_add_fpm_config
+	ynh_add_fpm_config --usage=$fpm_usage --footprint=$fpm_footprint
 fi
 
 #=================================================