Use the build number instead of the time for the cache key.

playbooks/roles/edxapp/tasks/deploy.yml

@@ -7,20 +7,6 @@
     owner={{ edxapp_user }}  group={{ common_web_user }}
     mode=0644
 
-- name: Get current time
-  shell: 'date +%s'
-  register: time_in_seconds
-  when: EDXAPP_UPDATE_STATIC_FILES_KEY
-
-- name: Update the static_files_key_prefix
-  set_fact:
-    edxapp_dynamic_cache_key: '{{time_in_seconds.stdout}}'
-  when: EDXAPP_UPDATE_STATIC_FILES_KEY
-
-- name: Print out the staticfiles prefix
-  debug: msg="Setting static_files_cache_prefix to {{time_in_seconds.stdout}}"
-  when: EDXAPP_UPDATE_STATIC_FILES_KEY
-
 # Optional auth for git
 - name: create ssh script for git (not authenticated)
   template: >

util/vpc-tools/abbey.py

@@ -337,6 +337,10 @@ EDXAPP_LOCAL_GIT_IDENTITY: $secure_identity
 # this is so that the application can come
 # up healthy
 fake_migrations: true
+
+# Use the build number an the dynamic cache key.
+EDXOAPP_UPDATE_STATIC_FILES_KEY: true
+edxapp_dynamic_cache_key: {build_id}
 EOF
 
 chmod 400 $secure_identity
@@ -377,7 +381,8 @@ rm -rf $base_dir
                 queue_name=run_id,
                 extra_vars_yml=extra_vars_yml,
                 git_refs_yml=git_refs_yml,
-                secure_vars=secure_vars)
+                secure_vars=secure_vars,
+                build_id=args.jenkin_build)
 
     ec2_args = {
         'security_group_ids': [security_group_id],