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suspend processes that interfere with cycling servers

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This commit is contained in:
Anuj Biyani 2013-04-16 17:56:33 -07:00
parent 9ba549ad00
commit 199c39bce9
1 changed files with 12 additions and 5 deletions
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17
aws-ha-release/aws-ha-release.sh
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@ -86,11 +86,14 @@ fi
if [[ `echo -e "$asg_result" | grep -c "^AUTO-SCALING-GROUP"` < 1 ]]
then echo "No Auto Scaling Group was found. Because no Auto Scaling Group has been found, $app_name does not know which Auto Scaling Group should have Instances terminated." 1>&2 ; exit 64
fi
#confirms that the selected Auto Scaling Group is not currently in state "Suspended Processing" - the "Suspending Processing" state prevents the termination of Auto Scaling Group instances and thus prevents aws-ha-release from running properly
if [[ `echo -e "$asg_result" | grep -c "SUSPENDED-PROCESS"` > 1 ]]
then echo "Scaling Processes for the Auto Scaling Group $asg_group_name are currently suspended. $app_name will now exit as Scaling Processes are required for $app_name to run properly." 1>&2 ; exit 77
fi
#confirms that certain Auto Scaling processes are not suspended. For certain processes, the "Suspending Processing" state prevents the termination of Auto Scaling Group instances and thus prevents aws-ha-release from running properly.
necessary_processes=(RemoveFromLoadBalancerLowPriority Terminate Launch ReplaceUnhealthy HealthCheck)
for process in "${necessary_processes[@]}"
do
if [[ `echo -e "$asg_result" | grep -c "SUSPENDED-PROCESS$delimiter$process"` > 0 ]]
then echo "Scaling Process $process for the Auto Scaling Group $asg_group_name is currently suspended. $app_name will now exit as Scaling Processes ${necessary_processes[@]} are required for $app_name to run properly." 1>&2 ; exit 77
fi
done
#gets Auto Scaling Group max-size
asg_initial_max_size=`echo $asg_result | grep ^AUTO-SCALING-GROUP | cut -d "$delimiter" -f 9`
@ -108,6 +111,8 @@ fi
#echo a list of Instances that are slated for termination
echo -e "The list of Instances in Auto Scaling Group $asg_group_name that will be terminated is below:\n$asg_instance_list"
as-suspend-processes $asg_group_name --processes ReplaceUnhealthy,AlarmNotification,ScheduledActions,AZRebalance
#if the desired-capacity of an Auto Scaling Group group is greater than or equal to the max-size of an Auto Scaling Group, the max-size must be increased by 1 to cycle instances while maintaining desired-capacity. This is particularly true of groups of 1 instance (where we'd be removing all instances if we cycled).
if [[ $asg_initial_desired_capacity -ge $asg_initial_max_size ]]
then echo "$asg_group_name has a max-size of $asg_initial_max_size. In order to recycle instances max-size will be temporarily increased by 1 to max-size $asg_temporary_max_size."
@ -162,3 +167,5 @@ done
return_as_initial_maxsize
#return temporary desired-capacity to initial desired-capacity
return_as_initial_desiredcapacity
as-resume-processes $asg_group_name