diff --git a/conf/config.ini b/conf/config.ini
index cf164d0..feccda9 100644
--- a/conf/config.ini
+++ b/conf/config.ini
@@ -17,7 +17,7 @@ port     = 3306
 [app]
 site_name         = __SITENAME__
 site_description  = __SITEDESCRIPTION__
-host              = https://your-writefreely-url-instance.com
+host              = __DOMAIN_URL__
 theme             = write
 disable_js        = false
 webfonts          = true
diff --git a/conf/nginx.conf b/conf/nginx.conf
index 4899948..19cfa5b 100644
--- a/conf/nginx.conf
+++ b/conf/nginx.conf
@@ -1,6 +1,5 @@
 #sub_path_only rewrite ^__PATH__$ __PATH__/ permanent;
 
-
 location ~ ^/.well-known/(webfinger|nodeinfo|host-meta) {
     proxy_set_header Host $host;
     proxy_set_header X-Real-IP $remote_addr;
@@ -15,8 +14,6 @@ location ~ ^/(css|img|js|fonts)/ {
     # expires 12M;
 }
 
-
-
 location __PATH__/ {
   
   proxy_pass http://localhost:__PORT__/;
diff --git a/conf/systemd.service b/conf/systemd.service
index e480739..b2cdfdf 100644
--- a/conf/systemd.service
+++ b/conf/systemd.service
@@ -7,7 +7,7 @@ Type=simple
 User=__APP__
 Group=__APP__
 WorkingDirectory=__FINALPATH__/
-ExecStart=__FINALPATH__/writefreely >> /var/log/__APP__/__APP__.log 2>&1
+ExecStart=/bin/sh -c '__FINALPATH__/writefreely >> /var/log/__APP__/__APP__.log 2>&1'
 
 [Install]
 WantedBy=multi-user.target
diff --git a/scripts/backup b/scripts/backup
index 96a872c..a565a30 100755
--- a/scripts/backup
+++ b/scripts/backup
@@ -8,6 +8,8 @@
 
 source ../settings/scripts/detect_arch
 source ../settings/scripts/_common.sh
+source ../settings/scripts/detect_arch
+source ../settings/scripts/ynh_systemd_action
 source /usr/share/yunohost/helpers
 
 #=================================================
@@ -25,7 +27,7 @@ fi
 
 ynh_clean_setup () {
 	### Remove this function if there's nothing to clean before calling the remove script.
-	true
+	ynh_clean_check_starting
 }
 # Exit if an error occurs during the execution of the script
 ynh_abort_if_errors
diff --git a/scripts/change_url b/scripts/change_url
index 1f71445..ff6fa1b 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -100,18 +100,27 @@ fi
 #=================================================
 # SPECIFIC MODIFICATIONS
 #=================================================
-# ...
+# STOP SERVICE
 #=================================================
 
-# Stop writefreely for modification
-yunohost service stop "$app"
+ynh_systemd_action --action=stop --service_name=$app
+
+#=================================================
+# MODIFY A CONFIG FILE
+#=================================================
 
 ynh_replace_string "host              =.*" "host              =https://$new_domain$new_path" "$final_path/config.ini"
 
-# Start writefreely after modification
-yunohost service start $app
+#=================================================
+# START SERVICE
+#=================================================
 
-### Verify the checksum of a file, stored by `ynh_store_file_checksum` in the install script.
+ynh_systemd_action --action=start --service_name=$app
+
+#=================================================
+# STORE THE CONFIG FILE CHECKSUM
+#=================================================
+fy the checksum of a file, stored by `ynh_store_file_checksum` in the install script.
 ### And create a backup of this file if the checksum is different. So the file will be backed up if the admin had modified it.
 ynh_backup_if_checksum_is_different "$final_path/config.ini"
 # Recalculate and store the checksum of the file for the next upgrade.
diff --git a/scripts/install b/scripts/install
index c82e337..cbf201e 100755
--- a/scripts/install
+++ b/scripts/install
@@ -8,6 +8,8 @@
 
 source detect_arch
 source _common.sh
+source detect_arch
+source ynh_systemd_action
 source /usr/share/yunohost/helpers
 
 #=================================================
@@ -25,7 +27,7 @@ fi
 
 ynh_clean_setup () {
 	### Remove this function if there's nothing to clean before calling the remove script.
-	true
+	ynh_clean_check_starting
 }
 # Exit if an error occurs during the execution of the script
 ynh_abort_if_errors
@@ -57,7 +59,6 @@ then
 	admin="test"
 fi
 
-
 ### If it's a multi-instance app, meaning it can be installed several times independently
 ### The id of the app as stated in the manifest is available as $YNH_APP_ID
 ### The instance number is available as $YNH_APP_INSTANCE_NUMBER (equals "1", "2", ...)
@@ -76,7 +77,7 @@ app=$YNH_APP_INSTANCE_NAME
 
 ### If the app uses nginx as web server (written in HTML/PHP in most cases), the final path should be "/var/www/$app".
 ### If the app provides an internal web server (or uses another application server such as uwsgi), the final path should be "/opt/yunohost/$app"
-final_path=/var/www/$app
+final_path="/var/www/$app"
 test ! -e "$final_path" || ynh_die "This path already contains a folder"
 
 # Normalize the url path syntax
@@ -250,7 +251,6 @@ ynh_add_systemd_config
 #	ynh_app_setting_delete $app skipped_uris
 #fi
 
-
 #=================================================
 # MODIFY A CONFIG FILE
 #=================================================
@@ -259,13 +259,13 @@ ynh_add_systemd_config
 ### (It's compatible with sed regular expressions syntax)
 
 # setup application config
-sudo cp ../conf/config.ini $final_path/config.ini
+sudo cp "../conf/config.ini" "$final_path/config.ini"
 
 ynh_replace_string "__DBNAME__" "$db_name" "$final_path/config.ini"
 ynh_replace_string "__DBUSER__" "$db_name" "$final_path/config.ini"
 ynh_replace_string "__DBPWD__" "$db_pwd" "$final_path/config.ini"
 ynh_replace_string "__PORT__" "$port" "$final_path/config.ini"
-ynh_replace_string "https://your-writefreely-url-instance.com" "https://$domain$path_url" "$final_path/config.ini"
+ynh_replace_string "__DOMAIN_URL__" "https://$domain$path_url" "$final_path/config.ini"
 ynh_replace_string "__SINGLEUSER__" "$single_user" "$final_path/config.ini"
 ynh_replace_string "__SITENAME__" "$site_name" "$final_path/config.ini"
 ynh_replace_string "__SITEDESCRIPTION__" "$site_description" "$final_path/config.ini"
@@ -290,13 +290,23 @@ ynh_store_file_checksum "$final_path/config.ini"
 #=================================================
 # SPECIFIC SETUP
 #=================================================
-# ...
+# CREATE LOG FOLDER
 #=================================================
 
-( cd $final_path && $final_path/writefreely --init-db )
-( cd $final_path && $final_path/writefreely --gen-keys )
-( cd $final_path && $final_path/writefreely --create-admin $admin:$password )
+mkdir -p "/var/log/$app"
+chown -R "$app":"$app" "/var/log/$app"
 
+#=================================================
+# MAKE SETUP
+#=================================================
+
+chown -R "$app":"$app" "$final_path"
+
+pushd $final_path
+	sudo -u $app ./writefreely --init-db
+	sudo -u $app ./writefreely --gen-keys
+	sudo -u $app ./writefreely --create-admin "$admin":"$password"
+popd
 
 #=================================================
 # GENERIC FINALIZATION
@@ -325,7 +335,6 @@ chown -R "$app":"$app" "$final_path"
 
 # Use logrotate to manage application logfile(s)
 ynh_use_logrotate
-chown -R $app: /var/log/$app/
 
 #=================================================
 # ADVERTISE SERVICE IN ADMIN PANEL
@@ -344,7 +353,6 @@ chown -R $app: /var/log/$app/
 # if using yunohost version 3.2 or more in the 'manifest.json', a description can be added
 yunohost service add $app --description "$app daemon for WriteFreely" --log "/var/log/$app/$app.log"
 
-
 #=================================================
 # SETUP SSOWAT
 #=================================================
@@ -366,4 +374,4 @@ systemctl reload nginx
 # START SERVICE
 #=================================================
 
-yunohost service start $app
+ynh_systemd_action --action=start --service_name=$app
diff --git a/scripts/remove b/scripts/remove
index 7d890b0..e2cca67 100755
--- a/scripts/remove
+++ b/scripts/remove
@@ -8,6 +8,7 @@
 
 source detect_arch
 source _common.sh
+source ynh_systemd_action
 source /usr/share/yunohost/helpers
 
 #=================================================
@@ -28,7 +29,6 @@ app=$YNH_APP_INSTANCE_NAME
 domain=$(ynh_app_setting_get $app domain)
 port=$(ynh_app_setting_get $app port)
 db_name=$(ynh_app_setting_get $app db_name)
-db_user=$db_name
 final_path=$(ynh_app_setting_get $app final_path)
 
 #=================================================
@@ -63,7 +63,7 @@ ynh_remove_systemd_config
 #=================================================
 
 # Remove a database if it exists, along with the associated user
-ynh_mysql_remove_db $db_user $db_name
+ynh_mysql_remove_db $db_name $db_name
 
 #=================================================
 # REMOVE APP MAIN DIR
diff --git a/scripts/restore b/scripts/restore
index 24978a3..f4bb76a 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -8,6 +8,8 @@
 
 source ../settings/scripts/detect_arch
 source ../settings/scripts/_common.sh
+source ../settings/scripts/detect_arch
+source ../settings/scripts/ynh_systemd_action
 source /usr/share/yunohost/helpers
 
 #=================================================
@@ -25,7 +27,7 @@ fi
 
 ynh_clean_setup () {
 	#### Remove this function if there's nothing to clean before calling the remove script.
-	true
+	ynh_clean_check_starting
 }
 # Exit if an error occurs during the execution of the script
 ynh_abort_if_errors
@@ -107,6 +109,7 @@ chown -R "$app":"$app" "$final_path"
 
 ynh_restore_file "/etc/systemd/system/$app.service"
 systemctl enable $app.service
+systemctl daemon-reload
 
 #=================================================
 # ADVERTISE SERVICE IN ADMIN PANEL
@@ -135,8 +138,15 @@ ynh_restore_file "/etc/logrotate.d/$app"
 #systemctl reload php5-fpm
 systemctl reload nginx
 
+#=================================================
+# CREATE LOG FOLDER
+#=================================================
+
+mkdir -p "/var/log/$app"
+chown -R "$app":"$app" "/var/log/$app"
+
 #=================================================
 # START SERVICE
 #=================================================
 
-yunohost service start $app
+ynh_systemd_action --action=start --service_name=$app
diff --git a/scripts/upgrade b/scripts/upgrade
index d27f63d..efe6305 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -8,6 +8,9 @@
 
 source detect_arch
 source _common.sh
+source detect_arch
+source ynh_systemd_action
+source ynh_check_app_version_changed
 source /usr/share/yunohost/helpers
 
 #=================================================
@@ -34,6 +37,12 @@ final_path=$(ynh_app_setting_get $app final_path)
 db_name=$(ynh_app_setting_get $app db_name)
 port=$(ynh_app_setting_get $app port)
 
+#=================================================
+# CHECK VERSION
+#=================================================
+
+upgrade_type=$(ynh_check_app_version_changed)
+
 #=================================================
 # ENSURE DOWNWARD COMPATIBILITY
 #=================================================
@@ -68,12 +77,16 @@ ynh_backup_before_upgrade
 ynh_clean_setup () {
 	# restore it if the upgrade fails
 	ynh_restore_upgradebackup
+	ynh_clean_check_starting
 }
 # Exit if an error occurs during the execution of the script
 ynh_abort_if_errors
 
-# Stop writefreely for upgrade
-yunohost service stop "$app"
+#=================================================
+# STOP SERVICE
+#=================================================
+
+ynh_systemd_action --action=stop --service_name=$app
 
 #=================================================
 # CHECK THE PATH
@@ -88,8 +101,11 @@ path_url=$(ynh_normalize_url_path $path_url)
 # DOWNLOAD, CHECK AND UNPACK SOURCE
 #=================================================
 
+if [ "$upgrade_type" == "UPGRADE_APP" ]
+then
 # Download, check integrity, uncompress and patch the source from app.src
 ynh_setup_source "$final_path"
+fi
 
 #=================================================
 # NGINX CONFIGURATION
@@ -124,7 +140,11 @@ ynh_system_user_create "$app" "$final_path"
 # MAKE UPGRADE
 #=================================================
 
-( cd $final_path && $final_path/writefreely --migrate )
+chown -R "$app":"$app" "$final_path"
+
+pushd $final_path
+	sudo -u $app ./writefreely --migrate
+popd
 
 ### Verify the checksum of a file, stored by `ynh_store_file_checksum` in the install script.
 ### And create a backup of this file if the checksum is different. So the file will be backed up if the admin had modified it.
@@ -132,7 +152,6 @@ ynh_backup_if_checksum_is_different "$final_path/config.ini"
 # Recalculate and store the checksum of the file for the next upgrade.
 ynh_store_file_checksum "$final_path/config.ini"
 
-
 #=================================================
 # CLOSE A PORT
 #=================================================
@@ -143,7 +162,6 @@ then
 	yunohost firewall disallow TCP $port 2>&1
 fi
 
-
 #=================================================
 # SETUP LOGROTATE
 #=================================================
@@ -188,4 +206,4 @@ systemctl reload nginx
 # START SERVICE
 #=================================================
 
-yunohost service start $app
+ynh_systemd_action --action=start --service_name=$app
diff --git a/scripts/ynh_check_app_version_changed b/scripts/ynh_check_app_version_changed
new file mode 100644
index 0000000..641815c
--- /dev/null
+++ b/scripts/ynh_check_app_version_changed
@@ -0,0 +1,46 @@
+#!/bin/bash
+
+# Checks the app version to upgrade with the existing app version and returns:
+# - UPGRADE_APP if the upstream app version has changed
+# - UPGRADE_PACKAGE if only the YunoHost package has changed
+#
+## It stops the current script without error if the package is up-to-date
+#
+# This helper should be used to avoid an upgrade of an app, or the upstream part
+# of it, when it's not needed
+#
+# To force an upgrade, even if the package is up to date,
+# you have to set the variable YNH_FORCE_UPGRADE before.
+# example: sudo YNH_FORCE_UPGRADE=1 yunohost app upgrade MyApp
+
+# usage: ynh_check_app_version_changed
+ynh_check_app_version_changed () {
+  local force_upgrade=${YNH_FORCE_UPGRADE:-0}
+  local package_check=${PACKAGE_CHECK_EXEC:-0}
+
+  # By default, upstream app version has changed
+  local return_value="UPGRADE_APP"
+
+  local current_version=$(ynh_read_manifest "/etc/yunohost/apps/$YNH_APP_INSTANCE_NAME/manifest.json" "version" || echo 1.0)
+  local current_upstream_version="${current_version/~ynh*/}"
+  local update_version=$(ynh_read_manifest "../manifest.json" "version" || echo 1.0)
+  local update_upstream_version="${update_version/~ynh*/}"
+
+  if [ "$current_version" == "$update_version" ] ; then
+      # Complete versions are the same
+      if [ "$force_upgrade" != "0" ]
+      then
+        echo "Upgrade forced by YNH_FORCE_UPGRADE." >&2
+        unset YNH_FORCE_UPGRADE
+      elif [ "$package_check" != "0" ]
+      then
+        echo "Upgrade forced for package check." >&2
+      else
+        ynh_die "Up-to-date, nothing to do" 0
+      fi
+  elif [ "$current_upstream_version" == "$update_upstream_version" ] ; then
+    # Upstream versions are the same, only YunoHost package versions differ
+    return_value="UPGRADE_PACKAGE"
+  fi
+  echo $return_value
+}
diff --git a/scripts/ynh_systemd_action b/scripts/ynh_systemd_action
new file mode 100644
index 0000000..6bed6be
--- /dev/null
+++ b/scripts/ynh_systemd_action
@@ -0,0 +1,89 @@
+#!/bin/bash
+
+# Start (or other actions) a service,  print a log in case of failure and optionnaly wait until the service is completely started
+#
+# usage: ynh_systemd_action [-n service_name] [-a action] [ [-l "line to match"] [-p log_path] [-t timeout] [-e length] ]
+# | arg: -n, --service_name= - Name of the service to reload. Default : $app
+# | arg: -a, --action=       - Action to perform with systemctl. Default: start
+# | arg: -l, --line_match=   - Line to match - The line to find in the log to attest the service have finished to boot.
+#                              If not defined it don't wait until the service is completely started.
+# | arg: -p, --log_path=     - Log file - Path to the log file. Default : /var/log/$app/$app.log
+# | arg: -t, --timeout=      - Timeout - The maximum time to wait before ending the watching. Default : 300 seconds.
+# | arg: -e, --length=       - Length of the error log : Default : 20
+ynh_systemd_action() {
+    # Declare an array to define the options of this helper.
+    declare -Ar args_array=( [n]=service_name= [a]=action= [l]=line_match= [p]=log_path= [t]=timeout= [e]=length= )
+    local service_name
+    local action
+    local line_match
+    local length
+    local log_path
+    local timeout
+
+    # Manage arguments with getopts
+    ynh_handle_getopts_args "$@"
+
+    local service_name="${service_name:-$app}"
+    local action=${action:-start}
+    local log_path="${log_path:-/var/log/$service_name/$service_name.log}"
+    local length=${length:-20}
+    local timeout=${timeout:-300}
+
+    # Start to read the log
+    if [[ -n "${line_match:-}" ]]
+    then
+        local templog="$(mktemp)"
+	# Following the starting of the app in its log
+	if [ "$log_path" == "systemd" ] ; then
+            # Read the systemd journal
+            journalctl -u $service_name -f --since=-45 > "$templog" &
+	else
+            # Read the specified log file
+            tail -F -n0 "$log_path" > "$templog" &
+	fi
+        # Get the PID of the tail command
+        local pid_tail=$!
+    fi
+
+    echo "${action^} the service $service_name" >&2
+    systemctl $action $service_name \
+        || ( journalctl --lines=$length -u $service_name >&2 \
+        ; test -n "$log_path" && echo "--" && tail --lines=$length "$log_path" >&2 \
+        ; false )
+
+    # Start the timeout and try to find line_match
+    if [[ -n "${line_match:-}" ]]
+    then
+        local i=0
+        for i in $(seq 1 $timeout)
+        do
+            # Read the log until the sentence is found, that means the app finished to start. Or run until the timeout
+            if grep --quiet "$line_match" "$templog"
+            then
+                echo "The service $service_name has correctly started." >&2
+                break
+            fi
+            echo -n "." >&2
+            sleep 1
+        done
+        if [ $i -eq $timeout ]
+        then
+            echo "The service $service_name didn't fully started before the timeout." >&2
+            journalctl --lines=$length -u $service_name >&2
+            test -n "$log_path" && echo "--" && tail --lines=$length "$log_path" >&2
+        fi
+
+        echo ""
+        ynh_clean_check_starting
+    fi
+}
+
+# Clean temporary process and file used by ynh_check_starting
+# (usually used in ynh_clean_setup scripts)
+#
+# usage: ynh_clean_check_starting
+ynh_clean_check_starting () {
+	# Stop the execution of tail.
+	kill -s 15 $pid_tail 2>&1
+	ynh_secure_remove "$templog" 2>&1
+}