gitlab: Add option to use a tmpfs instead of log bindmount

This patch will provide a new config option `gitlab_log_tmpfs` to
configure the docker container to setup a tmpfs instead of the bindmount
for the log directory of GitLab.

This should solve all headache around logs clogging up the disk but
might just trades it against memory problems. So far the test-run looks
good, but time will tell if it is a sufficent solution.

roles/gitlab/defaults/main.yml

@@ -24,6 +24,9 @@ gitlab_data_location: "{{ gitlab_install_location }}/data"
 gitlab_config_location: "{{ gitlab_install_location }}/config"
 gitlab_log_location: "{{ gitlab_install_location }}/log"
 
+# Put GitLab's logs in a tempfs instead to save headache with diskspace
+gitlab_log_tmpfs: false
+
 # Set the certresolver to your desired traefik certresolver.
 # Note: This is `letsencrypt_cf` by default for backwards compatibility, you might want to use `letsencrypt_http` instead, depending on your setup
 gitlab_traefik_certresolver: letsencrypt_http

roles/gitlab/templates/docker-compose.yml

@@ -203,7 +203,16 @@ services:
     volumes:
       - "{{ gitlab_data_location }}:/var/opt/gitlab"
       - "{{ gitlab_config_location }}:/etc/gitlab"
+{% if gitlab_log_tmpfs %}
       - "{{ gitlab_log_location }}:/var/log/gitlab"
+{% endif %}
+
+
+{% if gitlab_log_tmpfs %}
+    tmpfs:
+      - "/var/log/gitlab:size=1G,noexec,nodev,nosuid,rw"
+{% endif %}
+
     restart: always
     ports:
       - "{{ gitlab_ssh_port }}:22"