// Example of Blue/Green Deployment for ETCD
// Create two separate ETCD clusters, "blue" and "green"
// Step 1: Deploy the new version on the "green" cluster
system('ETCD_VERSION=new-version docker run -d --name etcd-green etcd:latest');
// Step 2: Promote "green" as the active cluster
system('docker stop etcd-blue');
system('docker rename etcd-blue etcd-blue-old'); // backup old cluster
system('docker rename etcd-green etcd-blue');
// Step 3: Verify that "blue" is pointing to the new "green" cluster
// Once verified, you can remove the old cluster after a grace period
system('docker rm etcd-blue-old');
// rollback if needed
// to rollback, just stop the "blue", and rename "blue-old" back to "blue"
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