response - elastic beanstalk cron run twice -


i have 1 application on elastic beanstalk , cron jobs it.

the code of setting cron is

container_commands:   01_some_cron_job:     command: "echo '*/5 * * * * wget -o - -q -t 1 http://site.com/cronscript/' | crontab"   leader_only: true

this script calls mail sender. , i'm receive 2 message per time.

code of http://site.com/cronscript/ looks (php code)

require_once('ses.php'); $ses = new simpleemailservice(email_shortkey, email_longkey); $m = new simpleemailservicemessage(); $m->addto('user@domain.com'); $m->setfrom('response_service@domain.com'); $m->setsubject('test message'); $m->setmessagefromstring('', 'message content'); $send_emails=($ses->sendemail($m));

when call http://site.com/cronscript/ browser's address bar, receive 1 message want.

i believe what's happening first time deploy app, autoscaling picks 1 instance leader , new cron job created on instance. next time deploy app, autoscaling picks instance leader. end same cron job on 2 instances.

so basic test ssh instances , check crontab contents crontab -l

you can avoid duplicate cron jobs removing old cron jobs on instance regardless whether leader or not.

container_commands:   00_remove_old_cron_jobs:     command: "crontab -r || exit 0"   01_some_cron_job:     command: "echo '*/5 * * * * wget -o - -q -t 1 http://example.com/cronscript/' | crontab"     leader_only: true

as mentioned in running cron in elastic beanstalk auto-scaling environment: || exit 0 mandatory because if there no crontab in machine crontab -r command return status code > 0 (an error). elastic beanstalk stop deploy process if 1 of container_commands fail.

although never experienced situation when crontab not found on elastic beanstalk instance.

you can run /opt/elasticbeanstalk/bin/leader-test.sh test whether leader instance or not.

hope helps.


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