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update aws-ha-release to use AWS CLI

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Brett Porter 2014-11-06 12:51:01 +10:00
parent 922fcab3a7
commit 7f8f57a6d2
1 changed files with 21 additions and 25 deletions
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46
aws-ha-release/aws-ha-release.sh
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@ -8,7 +8,7 @@
#confirms that executables required for succesful script execution are available #confirms that executables required for succesful script execution are available
prerequisitecheck() prerequisitecheck()
{ {
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 for prerequisite in basename grep cut aws
do do
#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. #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.
hash $prerequisite &> /dev/null hash $prerequisite &> /dev/null
@ -23,14 +23,14 @@ return_as_initial_maxsize()
if [[ $max_size_change -eq 1 ]] if [[ $max_size_change -eq 1 ]]
then echo "$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 $asg_initial_max_size." then echo "$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."
#decrease max-size by 1 #decrease max-size by 1
as-update-auto-scaling-group $asg_group_name --region $region --max-size=$asg_initial_max_size aws autoscaling update-auto-scaling-group --auto-scaling-group-name $asg_group_name --region $region --max-size=$asg_initial_max_size
fi fi
} }
return_as_initial_desiredcapacity() return_as_initial_desiredcapacity()
{ {
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 $asg_initial_desired_capacity." echo "$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."
as-update-auto-scaling-group $asg_group_name --region $region --desired-capacity=$asg_initial_desired_capacity aws autoscaling update-auto-scaling-group --auto-scaling-group-name $asg_group_name --region $region --desired-capacity=$asg_initial_desired_capacity
} }
#set application defaults #set application defaults
@ -72,40 +72,36 @@ case $region in
esac esac
#creates variable containing Auto Scaling Group #creates variable containing Auto Scaling Group
asg_result=`as-describe-auto-scaling-groups $asg_group_name --show-long --max-records 1000 --region $region --delimiter $delimiter` asg_result=`aws autoscaling describe-auto-scaling-groups --auto-scaling-group-name $asg_group_name --region $region`
#validate Auto Scaling Group Exists #validate Auto Scaling Group Exists
#user response for Auto Scaling Group lookup - alerts user if Auto Scaling Group was not found. #validate - the pipeline of echo -e "$asg_result" | grep -c "AutoScalingGroupARN" must only return one group found - in the case below - more than one group has been found
if [[ $asg_result = "No AutoScalingGroups found" ]] if [[ `echo -e "$asg_result" | grep -c "AutoScalingGroupARN"` > 1 ]]
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
fi
#validate - the pipeline of echo -e "$asg_result" | grep -c "AUTO-SCALING-GROUP" must only return one group found - in the case below - more than one group has been found
if [[ `echo -e "$asg_result" | grep -c "^AUTO-SCALING-GROUP"` > 1 ]]
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 then echo "More than one Auto Scaling Group found. As more than one Auto Scaling Group has been found, $app_name does not know which Auto Scaling Group should have Instances terminated." 1>&2 ; exit 64
fi fi
#validate - the pipeline of echo -e "$asg_result" | grep -c "AUTO-SCALING-GROUP" must only return one group found #validate - the pipeline of echo -e "$asg_result" | grep -c "AutoScalingGroupARN" must only return one group found
if [[ `echo -e "$asg_result" | grep -c "^AUTO-SCALING-GROUP"` < 1 ]] if [[ `echo -e "$asg_result" | grep -c "AutoScalingGroupARN"` < 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 then echo "No Auto Scaling Group was found. Because no Auto Scaling Group has been found, $app_name does not know which Auto Scaling Group should have Instances terminated." 1>&2 ; exit 64
fi fi
#confirms that certain Auto Scaling processes are not suspended. For certain processes, the "Suspending Processing" state prevents the termination of Auto Scaling Group instances and thus prevents aws-ha-release from running properly. #confirms that certain Auto Scaling processes are not suspended. For certain processes, the "Suspending Processing" state prevents the termination of Auto Scaling Group instances and thus prevents aws-ha-release from running properly.
necessary_processes=(RemoveFromLoadBalancerLowPriority Terminate Launch HealthCheck AddToLoadBalancer) necessary_processes=(RemoveFromLoadBalancerLowPriority Terminate Launch HealthCheck AddToLoadBalancer)
for process in "${necessary_processes[@]}" for process in "${necessary_processes[@]}"
do do
if [[ `echo -e "$asg_result" | grep -c "SUSPENDED-PROCESS$delimiter$process"` > 0 ]] if [[ `echo -e "$asg_result" | grep -c "SuspensionReason"` > 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 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 fi
done done
#gets Auto Scaling Group max-size #gets Auto Scaling Group max-size
asg_initial_max_size=`echo $asg_result | grep ^AUTO-SCALING-GROUP | cut -d "$delimiter" -f 9` asg_initial_max_size=`echo $asg_result | awk '/MaxSize/{ print $2 }' RS=,`
asg_temporary_max_size=$(($asg_initial_max_size+1)) asg_temporary_max_size=$(($asg_initial_max_size+1))
#gets Auto Scaling Group desired-capacity #gets Auto Scaling Group desired-capacity
asg_initial_desired_capacity=`echo "$asg_result" | grep ^AUTO-SCALING-GROUP | cut -d "$delimiter" -f 10` asg_initial_desired_capacity=`echo $asg_result | awk '/DesiredCapacity/{ print $2 }' RS=,`
asg_temporary_desired_capacity=$((asg_initial_desired_capacity+1)) asg_temporary_desired_capacity=$((asg_initial_desired_capacity+1))
#gets list of Auto Scaling Group Instances - these Instances will be terminated #gets list of Auto Scaling Group Instances - these Instances will be terminated
asg_instance_list=`echo "$asg_result" | grep ^INSTANCE | cut -d "$delimiter" -f 2` asg_instance_list=`echo "$asg_result" | grep InstanceId | sed 's/.*i-/i-/' | sed 's/",//'`
#builds an array of load balancers #builds an array of load balancers
IFS=',' read -a asg_elbs <<< `echo "$asg_result" | grep ^AUTO-SCALING-GROUP | cut -d "$delimiter" -f 6` 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:]]//"`
#if the max-size of the Auto Scaling Group is zero there is no reason to run #if the max-size of the Auto Scaling Group is zero there is no reason to run
if [[ $asg_initial_max_size -eq 0 ]] if [[ $asg_initial_max_size -eq 0 ]]
@ -114,21 +110,21 @@ fi
#echo a list of Instances that are slated for termination #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" 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_processes_to_suspend="ReplaceUnhealthy AlarmNotification ScheduledActions AZRebalance"
as-suspend-processes $asg_group_name --processes $as_processes_to_suspend --region $region aws autoscaling suspend-processes --auto-scaling-group-name $asg_group_name --scaling-processes $as_processes_to_suspend --region $region
#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 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 ]] 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 $asg_temporary_max_size." then echo "$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."
#increase max-size by 1 #increase max-size by 1
as-update-auto-scaling-group $asg_group_name --region $region --max-size=$asg_temporary_max_size aws autoscaling update-auto-scaling-group --auto-scaling-group-name $asg_group_name --region $region --max-size=$asg_temporary_max_size
#sets the flag that max-size has been changed #sets the flag that max-size has been changed
max_size_change="1" max_size_change="1"
fi fi
#increase groups desired capacity to allow for instance recycling without decreasing available instances below initial capacity #increase groups desired capacity to allow for instance recycling without decreasing available instances below initial capacity
echo "$asg_group_name is currently at $asg_initial_desired_capacity desired-capacity. $app_name will increase desired-capacity by 1 to desired-capacity $asg_temporary_desired_capacity." echo "$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."
as-update-auto-scaling-group $asg_group_name --region $region --desired-capacity=$asg_temporary_desired_capacity aws autoscaling update-auto-scaling-group --auto-scaling-group-name $asg_group_name --region $region --desired-capacity=$asg_temporary_desired_capacity
#and begin recycling instances #and begin recycling instances
for instance_selected in $asg_instance_list for instance_selected in $asg_instance_list
@ -154,7 +150,7 @@ do
for index in "${!asg_elbs[@]}" for index in "${!asg_elbs[@]}"
do do
inservice_instance_list=`elb-describe-instance-health ${asg_elbs[$index]} --region $region --show-long | grep InService` inservice_instance_list=`aws elb describe-instance-health --load-balancer-name ${asg_elbs[$index]} --region $region --output text | grep InService`
inservice_instance_count=`echo "$inservice_instance_list" | wc -l` inservice_instance_count=`echo "$inservice_instance_list" | wc -l`
if [ $index -eq 0 ] if [ $index -eq 0 ]
@ -181,14 +177,14 @@ do
echo "Instance $instance_selected will now be deregistered from ELBs \"${asg_elbs[@]}.\"" echo "Instance $instance_selected will now be deregistered from ELBs \"${asg_elbs[@]}.\""
for elb in "${asg_elbs[@]}" for elb in "${asg_elbs[@]}"
do do
elb-deregister-instances-from-lb $elb --region $region --instances $instance_selected > /dev/null aws elb deregister-instances-from-load-balancer --load-balancer-name $elb --region $region --instances $instance_selected > /dev/null
done done
#sleep for "elb_timeout" seconds so that the instance can complete all processing before being terminated #sleep for "elb_timeout" seconds so that the instance can complete all processing before being terminated
sleep $elb_timeout sleep $elb_timeout
#terminates a pre-existing instance within the autoscaling group #terminates a pre-existing instance within the autoscaling group
echo "Instance $instance_selected will now be terminated. By terminating this Instance, the actual capacity will be decreased to 1 under desired-capacity." echo "Instance $instance_selected will now be terminated. By terminating this Instance, the actual capacity will be decreased to 1 under desired-capacity."
as-terminate-instance-in-auto-scaling-group --region $region --instance $instance_selected --no-decrement-desired-capacity --force > /dev/null aws autoscaling terminate-instance-in-auto-scaling-group --region $region --instance-id $instance_selected --no-should-decrement-desired-capacity > /dev/null
done done
#return max-size to initial size #return max-size to initial size
@ -197,4 +193,4 @@ return_as_initial_maxsize
#return temporary desired-capacity to initial desired-capacity #return temporary desired-capacity to initial desired-capacity
return_as_initial_desiredcapacity return_as_initial_desiredcapacity
as-resume-processes $asg_group_name --region $region aws autoscaling resume-processes --auto-scaling-group-name $asg_group_name --region $region