diff --git a/synapse/hooks/init b/synapse/hooks/init
new file mode 100755
index 0000000..0ad6d36
--- /dev/null
+++ b/synapse/hooks/init
@@ -0,0 +1,94 @@
+#!/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
+
+. lib/common
+
+# Please note that postgres detect on its own if its datadir needs to be populated
+
+service_def=$(get_compose_service_def "$SERVICE_NAME") || return 1
+options="$(e "$service_def" | shyaml -y get-value options)" || true
+
+
+SYNAPSE_OPTIONS=(
+    report-stats:bool        ## Enable anon stat reporting back to the Matrix project
+    enable-registration:bool ## Enable registration on the Synapse instance.
+    allow-guest:bool         ## allow guest joining this server.
+    event-cache-size:size    ## event cache size [default 10K].
+    max-upload-size:size     ## max upload size [default 10M].
+
+    ## shared secrets
+    registration-shared-secret:string  ## registrering users if registration is disable.
+    macaroon-secret-key:string         ## secret for signing access tokens to the server.
+
+    ## recaptcha
+    recaptcha-public-key:string  ## required in order to enable recaptcha upon registration
+    recaptcha-private-key:string ## required in order to enable recaptcha upon registration
+
+    ## turn
+    turn-uris:string             ## coma-separated list of TURN uris to enable TURN for this homeserver.
+    turn-secret:string           ## TURN shared secret if required.
+)
+
+OPTIONS_CONCAT=" ${SYNAPSE_OPTIONS[*]} "
+
+yaml_opts=()
+while read-0 key val; do
+    key_option="$key"
+    case "$OPTIONS_CONCAT" in
+        *" ${key_option}:bool "*)
+            case "${val,,}" in
+                true|ok|yes|y|1)
+                    val="\"yes\""
+                    ;;
+                false|ko|nok|no|n|0)
+                    val="\"no\""
+                    ;;
+                *)
+                    die "Invalid value for ${WHITE}$key$NORMAL, please use a boolean value."
+                    ;;
+            esac
+            ;;
+        *" ${key_option}:numeric "*)
+            if ! is_int "$val"; then
+                die "Invalid value for ${WHITE}$key$NORMAL, please use numeric value."
+            fi
+            ;;
+        *" ${key_option}:string "*)
+            :
+            ;;
+        *" ${key_option}:size "*)
+            [[ "${val}" =~ ^[0-9\.]+[KkMmGgTtPp]$ ]] || {
+                die "Unknown size specification '${val}'."
+            }
+            ;;
+        *)
+            case "${key//_/-}" in
+                *) die "Unknown option ${WHITE}$key$NORMAL.";;
+            esac
+            continue
+            ;;
+    esac
+    yaml_opts+=("$key" "$val")
+done < <(e "$options" | yaml_opt_flatten)
+
+config="\
+$SERVICE_NAME:
+  environment:
+    SYNAPSE_NO_TLS: \"yes\"
+"
+
+while read-0 key value; do
+    key=${key//-/_}
+    config+="$(printf "\n    SYNAPSE_%s: %s" "${key^^}" "$value")"
+done < <(array_values_to_stdin yaml_opts)
+
+init-config-add "$config"
diff --git a/synapse/hooks/postgres_database-relation-joined b/synapse/hooks/postgres_database-relation-joined
new file mode 100755
index 0000000..2d2d530
--- /dev/null
+++ b/synapse/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$PASSWORD" | md5_compat)
+
+
+init-config-add "
+$SERVICE_NAME:
+  environment:
+    POSTGRES_HOST: $MASTER_TARGET_SERVICE_NAME 
+    POSTGRES_DB: $DBNAME
+    POSTGRES_USER: $USER
+    POSTGRES_PASSWORD: $PASSWORD
+"
+
+[ "$control" == "$(relation-get control 2>/dev/null)" ] && exit 0
+
+
+relation-set control "$control"
+
+info "Configured $SERVICE_NAME code for $TARGET_SERVICE_NAME access."
diff --git a/synapse/hooks/web_proxy-relation-joined b/synapse/hooks/web_proxy-relation-joined
new file mode 100755
index 0000000..4e3e1f2
--- /dev/null
+++ b/synapse/hooks/web_proxy-relation-joined
@@ -0,0 +1,23 @@
+#!/bin/bash
+
+set -e
+
+. lib/common
+
+DOMAIN=$(relation-get domain) || exit 1
+
+url=$(relation-get url)
+
+if [ "${url%://*}" == "https" ]; then
+    no_tls="    SYNAPSE_NO_TLS: 'yes'"
+else
+    no_tls=
+fi
+
+init-config-add "
+$SERVICE_NAME:
+  environment:
+    SYNAPSE_SERVER_NAME: $DOMAIN
+$no_tls
+" || exit 1
+
diff --git a/synapse/lib/common b/synapse/lib/common
new file mode 100644
index 0000000..3d1cb8d
--- /dev/null
+++ b/synapse/lib/common
@@ -0,0 +1,20 @@
+# -*- mode: shell-script -*-
+
+
+yaml_opt_flatten() {
+    local prefix="$1" key value
+    while read-0 key value; do
+        if [ "$prefix" ]; then
+            new_prefix="${prefix}-${key}"
+        else
+            new_prefix="${key}"
+        fi
+        if [[ "$(echo "$value" | shyaml get-type)" == "struct" ]]; then
+            echo "$value" | yaml_opt_flatten "${new_prefix}"
+        else
+            printf "%s\0%s\0" "${new_prefix}" "$value"
+        fi
+    done < <(shyaml key-values-0)
+}
+
+
diff --git a/synapse/metadata.yml b/synapse/metadata.yml
new file mode 100644
index 0000000..6b22bd4
--- /dev/null
+++ b/synapse/metadata.yml
@@ -0,0 +1,46 @@
+description: Synapse
+maintainer: "Valentin Lab <valentin.lab@kalysto.org>"
+docker-image: docker.0k.io/synapse:py3.6
+data-resources:
+  - /data
+host-resources:
+  - /etc/localtime:ro
+
+default-options:
+  report-stats: no
+  enable-registration: no
+  allow-guest: no
+  event-cache-size: 10K
+  max-upload-size: 10M
+
+  # recaptcha:
+  #   ## https://www.google.com/recaptcha/admin/create
+  #   public-key: XXX
+  #   private-key: XXX
+  # turn:
+  #   uris:
+  #   secret:
+
+# docker-compose:
+#   ports:
+
+uses:
+  postgres-database:
+    constraint: required
+    auto: summon
+    solves:
+      database: "main storage"
+  # log-rotate:
+  #   constraint: recommended
+  #   auto: pair
+  #   solves:
+  #     disk-leak: "/data/logs"
+  web-proxy:
+    constraint: recommended
+    auto: pair
+    solves:
+      proxy: "Public access"
+    default-options:
+      ## ``nocanon`` is mandatory
+      ## see: https://github.com/matrix-org/synapse/blob/master/docs/reverse_proxy.rst
+      apache-proxy-pass-options: retry=0 nocanon
\ No newline at end of file