update aws-ha-release to use AWS CLI
This commit is contained in:
Brett Porter
parent
922fcab3a7
commit
7f8f57a6d2
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@ -8,7 +8,7 @@
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#confirms that executables required for succesful script execution are available
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prerequisitecheck()
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{
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for prerequisite in basename grep cut as-describe-auto-scaling-groups as-update-auto-scaling-group elb-deregister-instances-from-lb as-terminate-instance-in-auto-scaling-group elb-describe-instance-health
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for prerequisite in basename grep cut aws
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do
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#use of "hash" chosen as it is a shell builtin and will add programs to hash table, possibly speeding execution. Use of type also considered - open to suggestions.
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hash $prerequisite &> /dev/null
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@ -23,14 +23,14 @@ return_as_initial_maxsize()
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if [[ $max_size_change -eq 1 ]]
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then echo "$asg_group_name had its max-size increased temporarily by 1 to a max-size of $asg_temporary_max_size. $app_name will now return the max-size of $asg_group_name to its original max-size of $asg_initial_max_size."
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#decrease max-size by 1
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as-update-auto-scaling-group $asg_group_name --region $region --max-size=$asg_initial_max_size
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aws autoscaling update-auto-scaling-group --auto-scaling-group-name $asg_group_name --region $region --max-size=$asg_initial_max_size
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fi
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}
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return_as_initial_desiredcapacity()
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{
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echo "$asg_group_name had its desired-capacity increased temporarily by 1 to a desired-capacity of $asg_temporary_desired_capacity. $app_name will now return the desired-capacity of $asg_group_name to its original desired-capacity of $asg_initial_desired_capacity."
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as-update-auto-scaling-group $asg_group_name --region $region --desired-capacity=$asg_initial_desired_capacity
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aws autoscaling update-auto-scaling-group --auto-scaling-group-name $asg_group_name --region $region --desired-capacity=$asg_initial_desired_capacity
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}
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#set application defaults
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@ -72,40 +72,36 @@ case $region in
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esac
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#creates variable containing Auto Scaling Group
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asg_result=`as-describe-auto-scaling-groups $asg_group_name --show-long --max-records 1000 --region $region --delimiter $delimiter`
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asg_result=`aws autoscaling describe-auto-scaling-groups --auto-scaling-group-name $asg_group_name --region $region`
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#validate Auto Scaling Group Exists
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#user response for Auto Scaling Group lookup - alerts user if Auto Scaling Group was not found.
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if [[ $asg_result = "No AutoScalingGroups found" ]]
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then echo "The Auto Scaling Group named \"$asg_group_name\" does not exist in the region named \"$region\". You must specify an Auto Scaling Group that exists." 1>&2 ; exit 64
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fi
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#validate - the pipeline of echo -e "$asg_result" | grep -c "AUTO-SCALING-GROUP" must only return one group found - in the case below - more than one group has been found
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if [[ `echo -e "$asg_result" | grep -c "^AUTO-SCALING-GROUP"` > 1 ]]
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#validate - the pipeline of echo -e "$asg_result" | grep -c "AutoScalingGroupARN" must only return one group found - in the case below - more than one group has been found
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if [[ `echo -e "$asg_result" | grep -c "AutoScalingGroupARN"` > 1 ]]
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then echo "More than one Auto Scaling Group found. As more than one Auto Scaling Group has been found, $app_name does not know which Auto Scaling Group should have Instances terminated." 1>&2 ; exit 64
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fi
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#validate - the pipeline of echo -e "$asg_result" | grep -c "AUTO-SCALING-GROUP" must only return one group found
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if [[ `echo -e "$asg_result" | grep -c "^AUTO-SCALING-GROUP"` < 1 ]]
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#validate - the pipeline of echo -e "$asg_result" | grep -c "AutoScalingGroupARN" must only return one group found
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if [[ `echo -e "$asg_result" | grep -c "AutoScalingGroupARN"` < 1 ]]
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then echo "No Auto Scaling Group was found. Because no Auto Scaling Group has been found, $app_name does not know which Auto Scaling Group should have Instances terminated." 1>&2 ; exit 64
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fi
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#confirms that certain Auto Scaling processes are not suspended. For certain processes, the "Suspending Processing" state prevents the termination of Auto Scaling Group instances and thus prevents aws-ha-release from running properly.
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necessary_processes=(RemoveFromLoadBalancerLowPriority Terminate Launch HealthCheck AddToLoadBalancer)
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for process in "${necessary_processes[@]}"
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do
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if [[ `echo -e "$asg_result" | grep -c "SUSPENDED-PROCESS$delimiter$process"` > 0 ]]
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if [[ `echo -e "$asg_result" | grep -c "SuspensionReason"` > 0 ]]
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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
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fi
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done
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#gets Auto Scaling Group max-size
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asg_initial_max_size=`echo $asg_result | grep ^AUTO-SCALING-GROUP | cut -d "$delimiter" -f 9`
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asg_initial_max_size=`echo $asg_result | awk '/MaxSize/{ print $2 }' RS=,`
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asg_temporary_max_size=$(($asg_initial_max_size+1))
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#gets Auto Scaling Group desired-capacity
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asg_initial_desired_capacity=`echo "$asg_result" | grep ^AUTO-SCALING-GROUP | cut -d "$delimiter" -f 10`
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asg_initial_desired_capacity=`echo $asg_result | awk '/DesiredCapacity/{ print $2 }' RS=,`
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asg_temporary_desired_capacity=$((asg_initial_desired_capacity+1))
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#gets list of Auto Scaling Group Instances - these Instances will be terminated
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asg_instance_list=`echo "$asg_result" | grep ^INSTANCE | cut -d "$delimiter" -f 2`
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asg_instance_list=`echo "$asg_result" | grep InstanceId | sed 's/.*i-/i-/' | sed 's/",//'`
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#builds an array of load balancers
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IFS=',' read -a asg_elbs <<< `echo "$asg_result" | grep ^AUTO-SCALING-GROUP | cut -d "$delimiter" -f 6`
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asg_elbs=`aws autoscaling describe-auto-scaling-groups --auto-scaling-group-name $asg_group_name --region $region --output text | grep LOADBALANCERNAMES | sed "s/LOADBALANCERNAMES[[:space:]]//"`
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#if the max-size of the Auto Scaling Group is zero there is no reason to run
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if [[ $asg_initial_max_size -eq 0 ]]
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@ -114,21 +110,21 @@ fi
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#echo a list of Instances that are slated for termination
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echo -e "The list of Instances in Auto Scaling Group $asg_group_name that will be terminated is below:\n$asg_instance_list"
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as_processes_to_suspend="ReplaceUnhealthy,AlarmNotification,ScheduledActions,AZRebalance"
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as-suspend-processes $asg_group_name --processes $as_processes_to_suspend --region $region
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as_processes_to_suspend="ReplaceUnhealthy AlarmNotification ScheduledActions AZRebalance"
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aws autoscaling suspend-processes --auto-scaling-group-name $asg_group_name --scaling-processes $as_processes_to_suspend --region $region
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#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).
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if [[ $asg_initial_desired_capacity -ge $asg_initial_max_size ]]
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then echo "$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."
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#increase max-size by 1
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as-update-auto-scaling-group $asg_group_name --region $region --max-size=$asg_temporary_max_size
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aws autoscaling update-auto-scaling-group --auto-scaling-group-name $asg_group_name --region $region --max-size=$asg_temporary_max_size
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#sets the flag that max-size has been changed
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max_size_change="1"
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fi
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#increase groups desired capacity to allow for instance recycling without decreasing available instances below initial capacity
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echo "$asg_group_name is currently at $asg_initial_desired_capacity desired-capacity. $app_name will increase desired-capacity by 1 to desired-capacity $asg_temporary_desired_capacity."
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as-update-auto-scaling-group $asg_group_name --region $region --desired-capacity=$asg_temporary_desired_capacity
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aws autoscaling update-auto-scaling-group --auto-scaling-group-name $asg_group_name --region $region --desired-capacity=$asg_temporary_desired_capacity
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#and begin recycling instances
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for instance_selected in $asg_instance_list
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@ -154,7 +150,7 @@ do
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for index in "${!asg_elbs[@]}"
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do
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inservice_instance_list=`elb-describe-instance-health ${asg_elbs[$index]} --region $region --show-long | grep InService`
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inservice_instance_list=`aws elb describe-instance-health --load-balancer-name ${asg_elbs[$index]} --region $region --output text | grep InService`
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inservice_instance_count=`echo "$inservice_instance_list" | wc -l`
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if [ $index -eq 0 ]
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@ -181,14 +177,14 @@ do
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echo "Instance $instance_selected will now be deregistered from ELBs \"${asg_elbs[@]}.\""
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for elb in "${asg_elbs[@]}"
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do
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elb-deregister-instances-from-lb $elb --region $region --instances $instance_selected > /dev/null
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aws elb deregister-instances-from-load-balancer --load-balancer-name $elb --region $region --instances $instance_selected > /dev/null
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done
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#sleep for "elb_timeout" seconds so that the instance can complete all processing before being terminated
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sleep $elb_timeout
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#terminates a pre-existing instance within the autoscaling group
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echo "Instance $instance_selected will now be terminated. By terminating this Instance, the actual capacity will be decreased to 1 under desired-capacity."
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as-terminate-instance-in-auto-scaling-group --region $region --instance $instance_selected --no-decrement-desired-capacity --force > /dev/null
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aws autoscaling terminate-instance-in-auto-scaling-group --region $region --instance-id $instance_selected --no-should-decrement-desired-capacity > /dev/null
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done
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#return max-size to initial size
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@ -197,4 +193,4 @@ return_as_initial_maxsize
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#return temporary desired-capacity to initial desired-capacity
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return_as_initial_desiredcapacity
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as-resume-processes $asg_group_name --region $region
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aws autoscaling resume-processes --auto-scaling-group-name $asg_group_name --region $region
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