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allow for multiple load balancers

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This commit is contained in:
Anuj Biyani 2013-04-16 18:57:45 -07:00
parent 2b0693803d
commit 5feaf83e57
1 changed files with 26 additions and 7 deletions
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33
aws-ha-release/aws-ha-release.sh
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@ -103,7 +103,11 @@ 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
@ -129,8 +133,10 @@ 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=false
#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 ]]
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
@ -143,22 +149,35 @@ do
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 elb in "${asg_elbs[@]}"
do
inservice_instance_list=`elb-describe-instance-health $elb --region $region --show-long | grep InService`
inservice_instance_count=`echo "$inservice_instance_list" | wc -l`
[[ $inservice_instance_count -lt $asg_temporary_desired_capacity ]] && all_instances_inservice=false || all_instances_inservice=true
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