{"id":3164,"date":"2013-09-27T17:33:30","date_gmt":"2013-09-27T17:33:30","guid":{"rendered":"http:\/\/www.gubatron.com\/blog\/?p=3164"},"modified":"2019-04-25T13:18:58","modified_gmt":"2019-04-25T13:18:58","slug":"how-to-have-a-play-framework-app-autostart-during-boot-on-elastic-beanstalk-centos-ec2-instances","status":"publish","type":"post","link":"https:\/\/www.gubatron.com\/blog\/how-to-have-a-play-framework-app-autostart-during-boot-on-elastic-beanstalk-centos-ec2-instances\/","title":{"rendered":"How to have a Play framework app autostart during boot on Elastic Beanstalk CentOS ec2 instances"},"content":{"rendered":"

So you’ve created an Elastic Beanstalk environment, you have a play framework distribution which you’ve created using play dist<\/strong> (either on your local environment, or right there on the server, whatever you prefer)<\/p>\n

play dist<\/strong> outputs a my-app-1.0.zip<\/strong> file which has a self-contained version of your app with all the necessary libraries and a start<\/strong> script.<\/p>\n

Afer you unzip it, you end up with a my-app-1.0\/lib\/<\/strong> folder and a start script.<\/p>\n

[pastacode lang=”bash” manual=”%5Bec2-user%40ip-10-235-8-106%20bullq-1.0%5D%24%20ls%20-l%0Atotal%2024%0Adrwxrwxr-x%202%20ec2-user%20ec2-user%204096%20Sep%2027%2015%3A35%20lib%0A-rwxrwxr-x%201%20ec2-user%20ec2-user%204328%20Sep%2027%2015%3A35%20start” message=”” highlight=”” provider=”manual”\/]<\/p>\n

Make sure it’s executable by using chmod +x start<\/strong> on the start script.<\/p>\n

So now, this is all in the first ec2 instance of your elastic beanstalk environment, if you’re like me and you’ve used ubuntu\/debian for your server management things can be slightly different here, since Amazon preferred CentOS for their default image, and here I’ll show you how to make your play app auto start when the server boots because you want every new machine that may be instanciated to have your app installed and to start the service as soon as the machine is up.<\/p>\n

Create a \/etc\/init.d\/myappd script<\/strong>
\n(I’m using ‘myapp’ here as an example, your app can be named whatever is named, so replace accordingly)<\/p>\n

[pastacode lang=”bash” manual=”%23!%2Fusr%2Fbin%2Fenv%20bash%0A%23myappd%0A%23Script%20to%20start%7Cstop%7Crestart%20myappd%20from%20%2Fetc%2Finit.d%2F%0A%23By%20Gubatron%20%E2%80%93%20%40gubatron%20%E2%80%93%20gubatron%40gmail.com%0A%0A%23replace%20accordingly%20in%20these%20variables%20%E2%80%98myapp%E2%80%99%20for%20the%20name%20of%20your%20app%0APID_FILE%3D%2Fhome%2Fec2-user%2Fmyapp%2Fdist%2Fmyapp-1.0%2FRUNNING_PID%0ADAEMON_NAME%3Dmyappd%0ADAEMON_PATH%3D%2Fhome%2Fec2-user%2Fmyapp%0ADAEMON%3D%24DAEMON_PATH%2Fdist%2Fmyapp-1.0%2Fstart%0A%0Atest%20-x%20%24DAEMON%20%7C%7C%20exit%200%0A%0Aset%20-e%0A%0Afunction%20killDAEMON()%20%7B%0Aecho%20%E2%80%9Cstart%20kill%20daemon%E2%80%9D%0Akill%20-9%20cat%20%2Fhome%2Fec2-user%2Fbullq%2Fdist%2Fbullq-1.0%2FRUNNING_PID%0Aecho%20%E2%80%9Cend%20kill%20daemon%E2%80%9D%0A%7D%0A%0Afunction%20removePIDFile()%20%7B%0Aif%20%5B%20-e%20%24PID_FILE%20%5D%0Athen%0Arm%20-f%20%24PID_FILE%0Afi%0A%7D%0A%0Acase%20%241%20in%0Astart)%0AremovePIDFile%0Aecho%20%E2%80%9CStarting%20%24DAEMON_NAME%E2%80%A6%20%24DAEMON%E2%80%9D%0Anohup%20%24DAEMON%20%26%0A%3B%3B%0Arestart)%0Aecho%20%E2%80%9CHot%20restart%20of%20%24DAEMON_NAME%E2%80%9D%0AkillDAEMON%0AremovePIDFile%0ACOMMAND%3D%E2%80%9Dnohup%20%24DAEMON%20%26%E2%80%9D%3B%0Aecho%20%24COMMAND%0A%24COMMAND%0Arm%20-f%20%24PID_FILE%0A%3B%3B%0Astop)%0Aecho%20%E2%80%9CStopping%20%24DAEMON_NAME%E2%80%9D%0AkillDAEMON%0AremovePIDFile%0A%3B%3B%0A*)%0Aecho%20%E2%80%9CUsage%3A%20%24DAEMON_NAME%20%7Bstart%7Crestart%7Cstop%7D%E2%80%9D%20%3E%262%0Aexit%201%0A%3B%3B%0Aesac%0A%0Aexit%200″ message=”” highlight=”” provider=”manual”\/]<\/p>\n

 <\/p>\n

Wire it to autostart<\/strong><\/p>\n

The simplest way I found to have this script start when the server would boot was to add it at the end of the
\n\/etc\/rc.local<\/strong> file. (In ubuntu you’d register the new script with the upate-rc.d command)<\/p>\n

[pastacode lang=”bash” manual=”%23!%2Fbin%2Fsh%0A%23%0AThis%20script%20will%20be%20executed%20after%20all%20the%20other%20init%20scripts.%0AYou%20can%20put%20your%20own%20initialization%20stuff%20in%20here%20if%20you%20don%E2%80%99t%0Awant%20to%20do%20the%20full%20Sys%20V%20style%20init%20stuff.%0A%0Atouch%20%2Fvar%2Flock%2Fsubsys%2Flocal%0A%0A%2Fetc%2Finit.d%2Fmyappd%20start” message=”” highlight=”” provider=”manual”\/]<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

So you’ve created an Elastic Beanstalk environment, you have a play framework distribution which you’ve created using play dist (either on your local environment, or right there on the server, whatever you prefer) play dist outputs a my-app-1.0.zip file which has a self-contained version of your app with all the necessary libraries and a start […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[15,43],"tags":[1346,1301,1344,1156,1347,276,296,1157,1343,1345,1449,1315,1341,1342,1027],"class_list":["post-3164","post","type-post","status-publish","format-standard","hentry","category-code","category-linux","tag-etcrc-local","tag-amazon-web-services","tag-autostart","tag-aws","tag-centos","tag-cloud","tag-configuration","tag-ec2","tag-elastic-beans","tag-init-d","tag-linux","tag-management","tag-play","tag-play-framework","tag-ubuntu"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p5Unzf-P2","jetpack-related-posts":[{"id":3543,"url":"https:\/\/www.gubatron.com\/blog\/tutorial-how-to-pause-an-aws-elastic-beanstalk-environment-using-the-dashboard\/","url_meta":{"origin":3164,"position":0},"title":"[TUTORIAL] HOW TO PAUSE AN AWS ELASTIC BEANSTALK ENVIRONMENT USING THE DASHBOARD","author":"gubatron","date":"June 23, 2016","format":false,"excerpt":"So you have set up a test elastic beanstalk environment because you don't want to put at risk your production elastic bean. You don't want to pay for the time you're not using it, and there's no freaking \"Pause Environment\" option. all you can do is \"Terminate Environment\"? but then\u2026","rel":"","context":"In "Code"","block_context":{"text":"Code","link":"https:\/\/www.gubatron.com\/blog\/category\/code\/"},"img":{"alt_text":"aws-elasticbean-no-pause-option","src":"https:\/\/i0.wp.com\/www.gubatron.com\/blog\/wp-content\/uploads\/2016\/06\/Screen-Shot-2016-06-23-at-1.54.48-PM-219x300.png?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":3213,"url":"https:\/\/www.gubatron.com\/blog\/aws-troubleshooting-how-to-fix-a-broken-ebs-volume-bad-superblock-on-xfs\/","url_meta":{"origin":3164,"position":1},"title":"AWS troubleshooting: how to fix a broken EBS volume (bad superblock on xfs)","author":"gubatron","date":"January 19, 2014","format":false,"excerpt":"As great as EBS volumes are on Amazon Web Services, they can break and not ever mount again, even though your data could still be there intact, a simple corruption on the filesystem structure can cause a lot of damage. 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