diff --git a/.gitignore b/.gitignore
index 064317d..daa9006 100755
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,2 @@
 /playbook.retry
-/hosts.ini
 /*.json
diff --git a/README.md b/README.md
index abbedcc..a34748c 100644
--- a/README.md
+++ b/README.md
@@ -10,16 +10,11 @@ Available playbooks:
 + app-start
 + app-stop
 
-Start by copy then change values of hosts example file :
-
-```bash
-$ cp hosts.example.ini hosts.ini
-```
-
-Then create a file `vars.json` who contain :
+First create a file `vars.json` who contain :
 
 ```json
 {
+  "working_dir": "/home/vagrant/test",  
   "container_name": "myapp",
   "repository": "https://git.example.com/vendor/app.git",
   "version": "master",
@@ -38,7 +33,8 @@ Then create a file `vars.json` who contain :
 Then run a playbook: 
 
 ```bash
-$ ansible-playbook -i hosts.ini -e @vars.json playbooks/app-install.yml
+HOSTNAME=vps.example.com
+$ ansible-playbook -i $HOSTNAME, -e ansible_python_interpreter=/usr/bin/python3 -e @vars.json playbooks/app-install.yml
 ```
 
 ## Manage database
@@ -47,10 +43,11 @@ Available playbooks:
 
 + db-create
 
-First create a file `dbvars.json` who contain :
+First create a file `vars.json` who contain :
 
 ```json
 {
+  "ansible_python_interpreter": "/usr/bin/python3",
   "container_name": "myappdb",
   "envvars": {
     "MYSQL_ROOT_PASSWORD": "superpassword",
@@ -64,5 +61,6 @@ First create a file `dbvars.json` who contain :
 Then run a playbook:
 
 ```bash
-$ ansible-playbook -i hosts.ini -e @dbvars.json playbooks/db-create.yml
+HOSTNAME=vps.example.com
+$ ansible-playbook -i $HOSTNAME, -e ansible_python_interpreter=/usr/bin/python3 -e @vars.json playbooks/db-create.yml
 ```
diff --git a/hosts.example.ini b/hosts.example.ini
deleted file mode 100644
index d4783d6..0000000
--- a/hosts.example.ini
+++ /dev/null
@@ -1,7 +0,0 @@
-[webservers]
-example.com
-
-[webservers:vars]
-ansible_python_interpreter=/usr/bin/python3
-
-working_dir=/var/apps
diff --git a/playbooks/app-install.yml b/playbooks/app-install.yml
index 71bb355..50ab68f 100755
--- a/playbooks/app-install.yml
+++ b/playbooks/app-install.yml
@@ -1,6 +1,6 @@
 ---
 - name: Install app
-  hosts: webservers
+  hosts: all
   become: yes
 
   tasks:
diff --git a/playbooks/app-start.yml b/playbooks/app-start.yml
index 31630a3..506f0a4 100644
--- a/playbooks/app-start.yml
+++ b/playbooks/app-start.yml
@@ -1,6 +1,6 @@
 ---
 - name: Start app
-  hosts: webservers
+  hosts: all
   become: yes
 
   tasks:
diff --git a/playbooks/app-stop.yml b/playbooks/app-stop.yml
index 8cb7fbe..25391eb 100644
--- a/playbooks/app-stop.yml
+++ b/playbooks/app-stop.yml
@@ -1,6 +1,6 @@
 ---
 - name: Start app
-  hosts: webservers
+  hosts: all
   become: yes
 
   tasks:
diff --git a/playbooks/db-create.yml b/playbooks/db-create.yml
index 075db1e..fbed661 100644
--- a/playbooks/db-create.yml
+++ b/playbooks/db-create.yml
@@ -1,6 +1,6 @@
 ---
 - name: Create mysql database
-  hosts: webservers
+  hosts: all
   become: yes
 
   tasks: