This was written primarily for CoreOS Etcd instances created as part of an AWS Autoscaling Group, using the method described at https://github.com/MonsantoCo/etcd-aws-cluster.
Rather than adding the etcd-aws-cluster unit to every proxy client
of your etcd cluster, asg-route53 will add a SRV record to DNS
for all the etcd hosts, so they can be discovered by proxy clients,
as described at
https://coreos.com/etcd/docs/latest/clustering.html#discovery.
- Looks up instance metadata and queries
aws-sdkfor autoscaling group. - Looks up all instances for this autoscaling group.
- Updates given DNS record in Route53 to contain all ASG instances.
docker pull rlister/asg-route53:latest
docker run rlister/asg-route53:latest _etcd-server._tcp.example.com
{
"Version": "2012-10-17",
"Statement": [
{
"Action": [
"route53:ChangeResourceRecordSets"
],
"Resource": "arn:aws:route53:::hostedzone/$zone_id",
"Effect": "Allow"
},
{
"Action": [
"route53:GetChange"
],
"Resource": "arn:aws:route53:::change/*",
"Effect": "Allow"
},
{
"Action": [
"route53:ListHostedZonesByName"
],
"Resource": "*",
"Effect": "Allow"
},
{
"Action": [
"autoscaling:DescribeAutoScalingGroups",
"ec2:DescribeInstances",
"ec2:DescribeTags"
],
"Resource": "*",
"Effect": "Allow"
}
]
}
Download a static binary from https://github.com/rlister/asg-route53/releases.
docker pull rlister/asg-route53:latest
Unless running under an IAM role, you will need to pass in your AWS credentials to make AWS changes, for example:
docker run \
-e AWS_REGION \
-e AWS_ACCESS_KEY_ID \
-e AWS_SECRET_ACCESS_KEY \
rlister/asg-route53 my-security-group
Build your own using your favourite go build command, for example:
go build ./asg-route53.go
Binaries in releases are built using goxc:
goxc -t # first use
goxc bump
goxc -bc="linux darwin"
I build a tiny docker image from scratch as follows:
version=0.0.1
CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo asg-route53.go
docker build -t rlister/asg-route53:${version} .
docker tag -f rlister/asg-route53:${version} rlister/asg-route53:latest
docker push rlister/asg-route53
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