diff --git a/.env.j2 b/.env.j2
new file mode 100644
index 0000000..62baa88
--- /dev/null
+++ b/.env.j2
@@ -0,0 +1,3 @@
+{% for key,value in envvars.items() %}
+{{ key }}={{ value }}
+{% endfor %}
diff --git a/.gitignore b/.gitignore
index a80359c..aa2c66c 100755
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 /playbook.retry
 /hosts.ini
+/vars.json
diff --git a/README.md b/README.md
index b21f930..6a3865e 100644
--- a/README.md
+++ b/README.md
@@ -4,19 +4,30 @@ This playbook installs app from repository and bind Traefik on defined host.
 
 ## Installing
 
-Copy then change values of hosts example file:
+Copy then change values of hosts example file :
 
 ```bash
 $ cp hosts.example.ini hosts.ini
 ```
 
-Then run the playbook:
+Then create a file `vars.json` vars who contain :
+
+```json
+{
+  "name": "myapp",
+  "repository": "https://git.example.com/vendor/app.git",
+  "version": "master",
+  "host": "myapp.example.com",
+  "dockerfile": "Dockerfile",
+  "envvars": {
+    "APP_NAME": "Wonderful",
+    "APP_ENV": "production"
+  }
+}
+```
+
+Then run the playbook: 
 
 ```bash
-$ ansible-playbook -i hosts.ini playbook.yml \
-  -e name=myapp \
-  -e repository=https://git.example.com/vendor/app.git \
-  -e version=master \
-  -e host=myapp.example.com
-  -e dockerfile=Dockerfile
+$ ansible-playbook -i hosts.ini playbook.yml -e @vars.json
 ```
diff --git a/docker-compose.yml.j2 b/docker-compose.yml.j2
index 30cf048..d8f67ed 100644
--- a/docker-compose.yml.j2
+++ b/docker-compose.yml.j2
@@ -9,6 +9,8 @@ services:
     build:
       context: ./
       dockerfile: {{ dockerfile }}
+    env_file:
+      - .env.pilot
     networks:
       - web
     labels:
diff --git a/playbook.yml b/playbook.yml
index 8b75e4b..cb488b6 100755
--- a/playbook.yml
+++ b/playbook.yml
@@ -10,6 +10,11 @@
         dest: "{{ working_dir }}/{{ name }}"
         version: "{{ version }}"
 
+    - name: Build env file
+      template:
+        src: .env.j2
+        dest: '{{ working_dir }}/{{ name }}/.env.pilot'
+
     - name: Build docker-compose file
       template:
         src: docker-compose.yml.j2