Created
July 18, 2017 14:24
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ElasticBeanstalk Cron setup w/ script to determine auto scaling group leader
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#read cron command into temporary file | |
echo "0 2 * * * . /opt/elasticbeanstalk/support/envvars; /var/app/current/path/to/command" > /tmp/mycron | |
#install new cron file | |
crontab /tmp/mycron | |
#delete unwanted mycron file | |
rm /tmp/mycron |
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container_commands: | |
remove_cron_jobs: | |
command: "crontab -r || exit 0" | |
set_cron_script_permissions: | |
command: "chmod 700 cron_setup.sh" | |
set_group_leader_permissions: | |
command: "chmod 755 group_leader.py" | |
run_cron_setup: | |
command: "bash cron_setup.sh" |
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#!/usr/bin/python | |
import sys, urllib2, boto.ec2.autoscale | |
this_instance = urllib2.urlopen('http://169.254.169.254/latest/meta-data/instance-id').read() | |
instance_list = boto.ec2.autoscale.connect_to_region('us-east-1').get_all_autoscaling_instances() | |
instance_list = [ i for i in instance_list if i.lifecycle_state == "InService" ] | |
asgroup = [ i for i in instance_list if i.instance_id == this_instance ][0].group_name | |
instances = [ i.instance_id for i in instance_list if i.group_name == asgroup ] | |
instances.sort() | |
sys.exit( instances[0] != this_instance ) |
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public function is_group_leader() { | |
// NOTE: | |
// Python script exit codes: | |
// 0 - clean exit without any errors / problems | |
// 1 - there was some issue / error / problem and that is why the program is exiting | |
$script = ROOT . DS . 'group_leader.py'; | |
exec($script, $output, $return_value); | |
$this->out($return_value == 0 ? 'Leader' : 'Not Leader'); | |
return $return_value == 0; | |
} |
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