diff --git a/judgels-env/hosts.ini b/judgels-env/hosts.ini
new file mode 100644
index 000000000..29e4e4f8f
--- /dev/null
+++ b/judgels-env/hosts.ini
@@ -0,0 +1,5 @@
+[core]
+34.101.52.134 ansible_user=root
+
+[grader]
+34.101.52.134 ansible_user=root
diff --git a/judgels-env/vars.yml b/judgels-env/vars.yml
new file mode 100644
index 000000000..57229cfa2
--- /dev/null
+++ b/judgels-env/vars.yml
@@ -0,0 +1,28 @@
+app_version: '2.0'
+app_name: Judgels
+app_slogan: Programming Contest System
+app_title: <h1>Welcome to Judgels</h1>
+app_description: <h2>This is a programming contest system.</h2>
+
+ansible_ssh_private_key_file: ~/.ssh/google_compute_engine
+
+nginx_domain_judgels_client: judgels.com
+nginx_domain_judgels_server_api: api.judgels.com
+nginx_domain_judgels_server_admin: admin.judgels.com
+nginx_certbot_email: admin@judgels.com
+
+# java_opts_judgels_server: -Xmx1g
+# java_opts_judgels_grader: -Xmx1g
+
+db_root_password: pass # <-------------------------- CHANGE THIS !!!
+db_username: judgels
+db_password: pass # <------------------------------- CHANGE THIS !!!
+
+rabbitmq_username: judgels
+rabbitmq_password: pass # <------------------------- CHANGE THIS !!!
+
+jophiel_superadmin_initialPassword: superadmin # <-- CHANGE THIS !!!
+jophiel_session_maxConcurrentSessionsPerUser: -1
+jophiel_session_disableLogout: false
+
+gabriel_grading_numWorkerThreads: 1