Restart Unicorn

Premise

I'm deploying a Rails app on EC2 and using Unicorn as my application server.

If it was a development environment, I should have started it with rails s, but in the production environment, the method of starting and stopping the server has changed, so I summarized it as a memo.

Steps if you want to stop the server

Unicorn startup confirmation

ps -ef | grep unicorn | grep -v grep

vinaka     15533     1  0 08:02 ?        00:00:01 unicorn_rails master -c /var/www/rails/ShitsumonWa-/config/unicorn.conf.rb -D -E production                                                                                    
vinaka     15537 15533  0 08:03 ?        00:00:00 unicorn_rails worker[0] -c /var/www/rails/ShitsumonWa-/config/unicorn.conf.rb -D -E production                                                                                 
vinaka     15538 15533  0 08:03 ?        00:00:00 unicorn_rails worker[1] -c /var/www/rails/ShitsumonWa-/config/unicorn.conf.rb -D -E production

Of master, worker [0], worker [1] If you see three, it seems that Unicorn is running.

kill

The top number of the three I just confirmed(master)15533 Tokill(The number changes every time, so every timeps -ef | grep unicorn | grep -v grepで番号To確認)

kill -9 15533

Unicorn stop confirmation

ps -ef | grep unicorn | grep -v grep

Then nothing should be displayed. If it is not displayed, Unicorn is stopped.

Procedure for starting the server again

Unicorn stop confirmation

ps -ef | grep unicorn | grep -v grep

Unicorn started!

 bundle exec unicorn_rails -c /var/www/rails/app name/config/unicorn.conf.rb -D -E production

If nothing comes out, it seems to be running properly.

I will confirm it for the time being.

ps -ef | grep unicorn | grep -v grep

vinaka     15740     1  1 08:48 ?        00:00:01 unicorn_rails master -c /var/www/rails/ShitsumonWa-/config/unicorn.conf.rb -D -E production                                                                                    
vinaka     15744 15740  0 08:48 ?        00:00:00 unicorn_rails worker[0] -c /var/www/rails/ShitsumonWa-/config/unicorn.conf.rb -D -E production                                                                                 
vinaka    15745 15740  0 08:48 ?        00:00:00 unicorn_rails worker[1] -c /var/www/rails/ShitsumonWa-/config/unicorn.conf.rb -D -E production

Three are displayed! It has been started. The number should have changed a while ago!

** By the way **

master failed to start, check stderr log for details

If you get an error

cat log/unicorn.log

Check the content of the error with. Unicorn version (It seems that an error will occur if it is 5.5 or higher, so it is better to specify the version with Gem file.)

Gemfile


group :production, :staging do
    gem 'unicorn', '5.4.1'
end

Also

unicorn_rails -c /var/www/rails/app name/config/unicorn.conf.rb -D -E production

It may get angry, so it is safer to add bundle exec.

bundle exec unicorn_rails -c /var/www/rails/app name/config/unicorn.conf.rb -D -E production

restart nginx too

When `ʻUnicorn`` starts up safely, restart nginx and you're done.

sudo nginx -s reload

It's the end.

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Restart Unicorn