Unicorn unable to write pid file

Question

I am using deploying a Ruby on Rails app to a Linode VPS using Capistrano. I am using Unicorn as the application server and Nginx as the proxy. My problem is that I am not able

Answer 1

Actually, the error message has already told you why:

directory for pid=/home/deploy/apps/shared/pids/unicorn.pid not writable

So, does the directory /home/deploy/apps/shared/pids exist? If not, you should call mkdir to create it.

Answer 2

Unicorn process is running in background(-d), type

ps aux | grep unicorn

and kill running unicorn process then start once again.

Answer 3

in capistrano 3; if we change roles to :all, then while deployment capistrano saying; WARN [SKIPPING] No Matching Host for ..... and after deployment all symlinks not working anymore. And if tmp/pids folder in symlink array, then unicorn can't find the tmp/pids folder and saying unicorn.pid is not writable.

So we must use; roles: %w{web app db} instead of roles :all.

Sample server line at production.rb;

server 'YOUR_SERVER_IP', user: 'YOUR_DEPLOY_USER', roles: %w{web app db}, ssh_options: { forward_agent: true }