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Auto generate haproxy "peers" based on existing ASG instances
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| #!/bin/bash | |
| # just a quick-and-dirty solution to update the peers configuration of haproxy upon ASG changes | |
| # instance-id becomes the peer name ( need to use -L<instance_id> on the haproxy command line) | |
| # port 7777 is used for p2p communication | |
| # call this script on crontab and redirect the output to > /etc/haproxy/peers.cfg then include that file into your haproxy config | |
| instance_id=$(curl http://169.254.169.254/latest/meta-data/instance-id) | |
| region=$(curl http://169.254.169.254/latest/meta-data/placement/availability-zone/) | |
| region=${region:0:${#region}-1} | |
| asg_name=$(aws ec2 describe-instances --instance-ids $instance_id --region $region | jq '.Reservations[].Instances[].Tags[] | select(.Key=="aws:autoscaling:groupName") | .Value' | xargs) | |
| instances=$(aws autoscaling describe-auto-scaling-groups --auto-scaling-group-name $asg_name --region $region --query "AutoScalingGroups[].Instances[].InstanceId" --output text | xargs ) | |
| private_ips=$(aws ec2 describe-instances --instance-ids $instances --region $region --query 'Reservations[].Instances[][InstanceId,NetworkInterfaces[].PrivateIpAddresses[0].PrivateIpAddress]' --output text | xargs -I{} echo -n "{};") | |
| IFS=";" read -a results <<< "$private_ips" | |
| echo "peers lb_repl" | |
| for (( i=0; i<$(( ${#results[@]} / 2 )); i++ )); do | |
| id=${results[$((i*2))]} | |
| ip=${results[$((1+i*2))]} | |
| echo " peer $id $ip:7777" | |
| done |
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