diff --git a/mattermost/hooks/init b/mattermost/hooks/init
new file mode 100755
index 00000000..c27e453b
--- /dev/null
+++ b/mattermost/hooks/init
@@ -0,0 +1,26 @@
+#!/bin/bash
+
+## Init is run on host
+## For now it is run every time the script is launched, but
+## it should be launched only once after build.
+
+## Accessible variables are:
+## - SERVICE_NAME        Name of current service
+## - DOCKER_BASE_IMAGE   Base image from which this service might be built if any
+## - SERVICE_DATASTORE           Location on host of the DATASTORE of this service
+## - SERVICE_CONFIGSTORE         Location on host of the CONFIGSTORE of this service
+
+
+# Please note that postgres detect on its own if its datadir needs to be populated
+
+
+##
+## checking permission of base directory
+##
+
+dirs=("$SERVICE_CONFIGSTORE/mattermost/"{config,plugins} "$SERVICE_DATASTORE/mattermost/"{data,logs})
+for dir in "${dirs[@]}"; do
+    mkdir -p "$dir"
+    find "$dir" \! -uid 2000 -exec chown -v 2000 {} \;
+    find "$dir" \! -gid 2000 -exec chgrp -v 2000 {} \;
+done
diff --git a/mattermost/hooks/postgres_database-relation-joined b/mattermost/hooks/postgres_database-relation-joined
new file mode 100755
index 00000000..a751df5c
--- /dev/null
+++ b/mattermost/hooks/postgres_database-relation-joined
@@ -0,0 +1,26 @@
+#!/bin/bash
+
+set -e
+
+PASSWORD="$(relation-get password)"
+USER="$(relation-get user)"
+DBNAME="$(relation-get dbname)"
+
+control=$(echo -en "$USER\0$DBNAME\0$PASSWORD" | md5_compat)
+
+config-add "\
+services:
+  $MASTER_BASE_SERVICE_NAME:
+    environment:
+      DB_HOST: $MASTER_TARGET_SERVICE_NAME
+      MM_DBNAME: $DBNAME
+      MM_PASSWORD: $PASSWORD
+      MM_USERNAME: $USER
+"
+
+[ "$control" == "$(relation-get control 2>/dev/null)" ] && exit 0
+
+
+relation-set control "$control"
+
+info "Configured $SERVICE_NAME code for $TARGET_SERVICE_NAME access."
diff --git a/mattermost/metadata.yml b/mattermost/metadata.yml
new file mode 100644
index 00000000..b90367f5
--- /dev/null
+++ b/mattermost/metadata.yml
@@ -0,0 +1,16 @@
+# description: "Mattermost"
+# maintainer: "Valentin Lab <valentin.lab@kalysto.org>"
+## We fix image here to be sure of what we install
+docker-image: docker.0k.io/mattermost-team
+# docker-image: docker.0k.io/mattermost-enterprise
+config-resources:
+  - /mattermost/config
+  - /mattermost/plugins
+data-resources:
+  - /mattermost/data
+  - /mattermost/logs
+host-resources:
+  - /etc/localtime:ro
+
+docker-compose:
+  restart: unless-stopped
\ No newline at end of file