diff --git a/aws-ha-release/aws-ha-release.sh b/aws-ha-release/aws-ha-release.sh index dab7f0d..e59a41f 100755 --- a/aws-ha-release/aws-ha-release.sh +++ b/aws-ha-release/aws-ha-release.sh @@ -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 $app_name to run properly." 1>&2 ; exit 77 -fi - +#confirms that certain Auto Scaling processes are not suspended. For certain processes, the "Suspending Processing" state prevents the termination of Auto Scaling Group instances and thus prevents aws-ha-release from running properly. +necessary_processes=(RemoveFromLoadBalancerLowPriority Terminate Launch HealthCheck AddToLoadBalancer) +for process in "${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` @@ -100,7 +103,10 @@ asg_initial_desired_capacity=`echo "$asg_result" | grep ^AUTO-SCALING-GROUP | cu asg_temporary_desired_capacity=$((asg_initial_desired_capacity+1)) #gets list of Auto Scaling Group Instances - these Instances will be terminated asg_instance_list=`echo "$asg_result" | grep ^INSTANCE | cut -d "$delimiter" -f 2` -asg_elb=`echo "$asg_result" | grep ^AUTO-SCALING-GROUP | cut -d "$delimiter" -f 6` + +#builds an array of load balancers +IFS=',' read -a asg_elbs <<< `echo "$asg_result" | grep ^AUTO-SCALING-GROUP | cut -d "$delimiter" -f 6` + #if the max-size of the Auto Scaling Group is zero there is no reason to run if [[ $asg_initial_max_size -eq 0 ]] then echo "$asg_group_name has a max-size of 0. As the Auto Scaling Group \"$asg_group_name\" has no active Instances there is no reason to run." ; exit 79 @@ -108,6 +114,9 @@ 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_processes_to_suspend="ReplaceUnhealthy,AlarmNotification,ScheduledActions,AZRebalance" +as-suspend-processes $asg_group_name --processes $as_processes_to_suspend + #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." @@ -124,33 +133,57 @@ as-update-auto-scaling-group $asg_group_name --region $region --desired-capacity #and begin recycling instances for instance_selected in $asg_instance_list do + all_instances_inservice=0 + #the while loop below sleeps for the auto scaling group to have an InService capacity that is equal to the desired-capacity + 1 - while [[ $inservice_instance_count -lt $asg_temporary_desired_capacity ]] + while [[ $all_instances_inservice -eq 0 ]] do if [[ $inservice_time_taken -gt $inservice_time_allowed ]] then echo "During the last $inservice_time_allowed seconds the InService capacity of the $asg_group_name Auto Scaling Group did not meet the Auto Scaling Group's desired capacity of $asg_temporary_desired_capacity." 1>&2 - #return max-size to initial size - return_as_initial_maxsize - #return temporary desired-capacity to initial desired-capacity - return_as_initial_desiredcapacity + echo "Because we can't be sure that instances created by this script are healthy, settings that were changed are being left as is. Settings that were changed:" + + if [[ $max_size_change -eq 1 ]] + then echo "max size was increased by $max_size_change" + fi + + echo "desired capacity was increased by 1" + echo "AutoScaling processes \"$as_processes_to_suspend\" were suspended." + exit 79 fi - inservice_instance_list=`elb-describe-instance-health $asg_elb --region $region --show-long | grep InService` - inservice_instance_count=`echo "$inservice_instance_list" | wc -l` + + for index in "${!asg_elbs[@]}" + do + inservice_instance_list=`elb-describe-instance-health ${asg_elbs[$index]} --region $region --show-long | grep InService` + inservice_instance_count=`echo "$inservice_instance_list" | wc -l` + + if [ $index -eq 0 ] + then [ $inservice_instance_count -eq $asg_temporary_desired_capacity ] && all_instances_inservice=1 || all_instances_inservice=0 + else + [[ ($all_instances_inservice -eq 1) && ($inservice_instance_count -eq $asg_temporary_desired_capacity) ]] && all_instances_inservice=1 || all_instances_inservice=0 + fi + done + #sleeps a particular amount of time sleep $inservice_polling_time + inservice_time_taken=$(($inservice_time_taken+$inservice_polling_time)) echo $inservice_instance_count "Instances are InService status. $asg_temporary_desired_capacity Instances are required to terminate the next instance. $inservice_time_taken seconds have elapsed while waiting for an Instance to reach InService status." - #if any status in $elbinstsancehealth != "InService" repeat + #if any status in $elbinstancehealth != "InService" repeat done + #if the echo "$asg_group_name has reached a desired-capacity of $asg_temporary_desired_capacity. $app_name can now remove an Instance from service." inservice_instance_count=0 inservice_time_taken=0 #remove instance from ELB - this ensures no traffic will be directed at an instance that will be terminated - echo "Instance $instance_selected will now be deregistered from ELB \"$asg_elb.\"" - elb-deregister-instances-from-lb $asg_elb --region $region --instances $instance_selected > /dev/null + echo "Instance $instance_selected will now be deregistered from ELBs \"${asg_elbs[@]}.\"" + for elb in "${asg_elbs[@]}" + do + elb-deregister-instances-from-lb $elb --region $region --instances $instance_selected > /dev/null + done + #sleep for "elb_timeout" seconds so that the instance can complete all processing before being terminated sleep $elb_timeout #terminates a pre-existing instance within the autoscaling group @@ -160,5 +193,8 @@ done #return max-size to initial size return_as_initial_maxsize + #return temporary desired-capacity to initial desired-capacity return_as_initial_desiredcapacity + +as-resume-processes $asg_group_name