diff --git a/README.md b/README.md
index 6afb824..b993fcb 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ An open source, modern and powerful wiki app built on Node.js, Git and Markdown
 
 **Wiki.js is still under development, all features not already implemented.**
 
-**Shipped version:** 2.0.0-beta.11
+**Shipped version:** 2.0.0-beta.13
 
 ## Licence
 
diff --git a/conf/app.src b/conf/app.src
index 9eaaaf7..e4dd89f 100644
--- a/conf/app.src
+++ b/conf/app.src
@@ -1,4 +1,4 @@
-SOURCE_URL=https://github.com/Requarks/wiki/releases/download/2.0.0-beta.11/wiki-js.tar.gz
+SOURCE_URL=url of app's source
 SOURCE_SUM=sha256 checksum
 SOURCE_SUM_PRG=sha256sum
 SOURCE_FORMAT=tar.gz
diff --git a/conf/systemd.service b/conf/systemd.service
index 35c2d16..eb1c958 100644
--- a/conf/systemd.service
+++ b/conf/systemd.service
@@ -7,7 +7,7 @@ Type=simple
 User=__APP__
 Group=__APP__
 WorkingDirectory=__FINALPATH__/
-ExecStart=__NODEJS_PATH__/node   __FINALPATH__/server >> /var/log/__APP__/__APP__.log 2>&1
+ExecStart=/bin/sh -c '__NODEJS_PATH__/node   __FINALPATH__/server >> /var/log/__APP__/__APP__.log 2>&1'
 
 [Install]
 WantedBy=multi-user.target
diff --git a/manifest.json b/manifest.json
index 1aa8d07..a58ba38 100644
--- a/manifest.json
+++ b/manifest.json
@@ -6,7 +6,7 @@
         "en": "An open source, modern and powerful wiki app built on Node.js, Git and Markdown for YunoHost.",
         "fr": "Un wiki moderne et open source propulsé Node.js, Git et Markdown pour YunoHost."
     },
-    "version": "2.0.0-beta.11~ynh1",
+    "version": "2.0.0-beta.13~ynh1",
     "url": "https://wiki.js.org/",
     "license": "AGPL-3.0-or-later",
     "maintainer": {
diff --git a/scripts/backup b/scripts/backup
index 4a8b7f0..93302d7 100644
--- a/scripts/backup
+++ b/scripts/backup
@@ -7,6 +7,7 @@
 #=================================================
 
 source ../settings/scripts/_common.sh
+source ../settings/scripts/ynh_systemd_action
 source /usr/share/yunohost/helpers
 
 #=================================================
@@ -15,7 +16,7 @@ source /usr/share/yunohost/helpers
 
 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/install b/scripts/install
index c45ea91..38032f0 100644
--- a/scripts/install
+++ b/scripts/install
@@ -7,6 +7,7 @@
 #=================================================
 
 source _common.sh
+source ynh_systemd_action
 source /usr/share/yunohost/helpers
 
 #=================================================
@@ -15,7 +16,7 @@ source /usr/share/yunohost/helpers
 
 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
@@ -96,9 +97,13 @@ ynh_app_setting_set $app port $port
 ###		- As well as the section "REINSTALL DEPENDENCIES" in the restore script
 ###		- And the section "UPGRADE DEPENDENCIES" in the upgrade script
 
-ynh_install_app_dependencies redis-server postgresql postgresql-contrib
+curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
+echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
+
 ynh_install_nodejs 10
 
+ynh_install_app_dependencies redis-server postgresql postgresql-contrib yarn
+
 #=================================================
 # CREATE A POSTGRESQL DATABASE
 #=================================================
@@ -132,6 +137,10 @@ ynh_app_setting_set $app final_path $final_path
 #ynh_setup_source "$final_path"
 git clone https://github.com/Requarks/wiki "$final_path"
 
+pushd $final_path
+	git checkout "tags/2.0.0-beta.13" --quiet
+popd
+
 #=================================================
 # NGINX CONFIGURATION
 #=================================================
@@ -169,20 +178,22 @@ ynh_system_user_create "$app" "$final_path"
 #=================================================
 # SPECIFIC SETUP
 #=================================================
-# ...
+# CREATE LOG FOLDER
+#=================================================
+
+mkdir -p "/var/log/$app"
+chown -R "$app":"$app" "/var/log/$app"
+
+#=================================================
+# MAKE SETUP
 #=================================================
 
 chown -R "$app":"$app" "$final_path"
 
 pushd $final_path
-ynh_use_nodejs
-sudo -u $app env PATH=$PATH:$nodejs_path npm install "graphql@^0.13.1"
-sudo -u $app env PATH=$PATH:$nodejs_path npm install "acorn@^6.0.0"
-sudo -u $app env PATH=$PATH:$nodejs_path npm install "babel-core@>=6.0.20"
-sudo -u $app env PATH=$PATH:$nodejs_path npm install "eslint@>=5.0.0"
-sudo -u $app env PATH=$PATH:$nodejs_path npm install
-sudo -u $app env PATH=$PATH:$nodejs_path npm audit fix
-sudo -u $app env PATH=$PATH:$nodejs_path npm run build
+    ynh_use_nodejs
+	sudo -u $app env PATH=$PATH:$nodejs_path yarn install
+    sudo -u $app env PATH=$PATH:$nodejs_path npm run build
 popd
 
 
@@ -317,6 +328,11 @@ fi
 #=================================================
 # RELOAD NGINX
 #=================================================
-systemctl start $app
+
 systemctl reload nginx
-sleep 30
+
+#=================================================
+# START SERVICE
+#=================================================
+
+ynh_systemd_action --action=start --service_name=$app --line_match="Redis connection:"
diff --git a/scripts/remove b/scripts/remove
index 39d1815..2b6f6a4 100644
--- a/scripts/remove
+++ b/scripts/remove
@@ -7,6 +7,7 @@
 #=================================================
 
 source _common.sh
+source ynh_systemd_action
 source /usr/share/yunohost/helpers
 
 #=================================================
@@ -57,12 +58,13 @@ ynh_remove_app_dependencies
 ynh_use_nodejs
 ynh_remove_nodejs
 
+rm -rf "/etc/apt/sources.list.d/yarn.list"
+
 #=================================================
 # REMOVE APP MAIN DIR
 #=================================================
 
 # remove tmp files
-sudo -u $app rm -rf /tmp/*
 ynh_secure_remove "/var/tmp/*"
 
 # Remove the app directory securely
diff --git a/scripts/restore b/scripts/restore
index b6fb475..9541981 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -7,6 +7,7 @@
 #=================================================
 
 source ../settings/scripts/_common.sh
+source ../settings/scripts/ynh_systemd_action
 source /usr/share/yunohost/helpers
 
 #=================================================
@@ -15,7 +16,7 @@ source /usr/share/yunohost/helpers
 
 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
@@ -91,16 +92,21 @@ chown -R "$app":"$app" "$final_path"
 #=================================================
 
 # Define and install dependencies
-ynh_install_app_dependencies redis-server postgresql postgresql-contrib
+
+curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
+echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
+
 ynh_install_nodejs 10
 
+ynh_install_app_dependencies redis-server postgresql postgresql-contrib yarn
+
 #=================================================
 # RESTORE SYSTEMD
 #=================================================
 
 ynh_restore_file "/etc/systemd/system/$app.service"
 systemctl enable $app.service
-systemctl start $app
+systemctl daemon-reload
 
 #=================================================
 # ADVERTISE SERVICE IN ADMIN PANEL
@@ -128,4 +134,16 @@ ynh_restore_file "/etc/logrotate.d/$app"
 
 #systemctl reload php5-fpm
 systemctl reload nginx
-sleep 30
+
+#=================================================
+# CREATE LOG FOLDER
+#=================================================
+
+mkdir -p "/var/log/$app"
+chown -R "$app":"$app" "/var/log/$app"
+
+#=================================================
+# START SERVICE
+#=================================================
+
+ynh_systemd_action --action=start --service_name=$app --line_match="Redis connection:"
diff --git a/scripts/upgrade b/scripts/upgrade
index d304d57..bbb5706 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -7,6 +7,7 @@
 #=================================================
 
 source _common.sh
+source ynh_systemd_action
 source /usr/share/yunohost/helpers
 
 #=================================================
@@ -22,6 +23,7 @@ is_public=$(ynh_app_setting_get $app is_public)
 final_path=$(ynh_app_setting_get $app final_path)
 #language=$(ynh_app_setting_get $app language)
 db_name=$(ynh_app_setting_get $app db_name)
+db_pwd=$(ynh_app_setting_get $app db_pwd)
 port=$(ynh_app_setting_get $app port)
 
 #=================================================
@@ -58,10 +60,17 @@ 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 SERVICE
+#=================================================
+
+ynh_systemd_action --action=stop --service_name=$app
+
 #=================================================
 # CHECK THE PATH
 #=================================================
@@ -77,7 +86,11 @@ path_url=$(ynh_normalize_url_path $path_url)
 
 # Download, check integrity, uncompress and patch the source from app.src
 #ynh_setup_source "$final_path"
-( cd $final_path && git pull )
+
+pushd $final_path
+	git fetch origin
+	git checkout "tags/2.0.0-beta.13" --quiet
+popd
 
 #=================================================
 # NGINX CONFIGURATION
@@ -90,9 +103,13 @@ ynh_add_nginx_config
 # UPGRADE DEPENDENCIES
 #=================================================
 
-ynh_install_app_dependencies redis-server postgresql postgresql-contrib
+curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
+echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
+
 ynh_install_nodejs 10
 
+ynh_install_app_dependencies redis-server postgresql postgresql-contrib yarn
+
 #=================================================
 # CREATE DEDICATED USER
 #=================================================
@@ -116,16 +133,26 @@ ynh_system_user_create "$app" "$final_path"
 chown -R "$app":"$app" "$final_path"
 
 pushd $final_path
-ynh_use_nodejs
-sudo -u $app env PATH=$PATH:$nodejs_path npm install "graphql@^0.13.1"
-sudo -u $app env PATH=$PATH:$nodejs_path npm install "acorn@^6.0.0"
-sudo -u $app env PATH=$PATH:$nodejs_path npm install "babel-core@>=6.0.20"
-sudo -u $app env PATH=$PATH:$nodejs_path npm install "eslint@>=5.0.0"
-sudo -u $app env PATH=$PATH:$nodejs_path npm install
-sudo -u $app env PATH=$PATH:$nodejs_path npm audit fix
-sudo -u $app env PATH=$PATH:$nodejs_path npm run build
+    ynh_use_nodejs
+    sudo -u $app env PATH=$PATH:$nodejs_path yarn install
+    sudo -u $app env PATH=$PATH:$nodejs_path npm run build
 popd
 
+
+#=================================================
+# MODIFY A CONFIG FILE
+#=================================================
+
+cp -f ../conf/config.sample.yml "$final_path/config.yml"
+
+### `ynh_replace_string` is used to replace a string in a file.
+### (It's compatible with sed regular expressions syntax)
+
+#ynh_replace_string "match_string" "replace_string" "$final_path/config.yml"
+ynh_replace_string "__PORT__" "$port" "$final_path/config.yml"
+ynh_replace_string "__DB_PWD__" "$db_pwd" "$final_path/config.yml"
+ynh_replace_string "__DB_NAME__" "$db_name" "$final_path/config.yml"
+
 ### 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.
 ynh_backup_if_checksum_is_different "$final_path/config.yml"
@@ -172,4 +199,9 @@ fi
 #=================================================
 
 systemctl reload nginx
-sleep 30
+
+#=================================================
+# START SERVICE
+#=================================================
+
+ynh_systemd_action --action=start --service_name=$app --line_match="Redis connection:"
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
+}