tleyden5iwx/etcd-discovery repository overview

A wrapper around etcd⁠, with some discovery-related additions that calls etcd with the right advertising related URLs.

⁠The problem this is trying to solve

As described in this Google Groups thread⁠, when running etcd in the context of Kubernetes, there's no straighforward way to discover what IP should be used for the -advertise-client-urls etcd parameter.

Without a correct -advertise-client-urls etcd parameter, code that uses the etcd client API (such as etcdctl) will not work. (curl, on the other hand, will still work)

⁠How to use

Instead of invoking etcd via:

$ etcd -listen-client-urls http://0.0.0.0:2379 -advertise-client-urls http://10.1.50.34:2379

You would instead run:

$ etcdisco -listen-client-urls http://0.0.0.0:2379 -advertise-client-urls http://{{.LOCAL_IP}}:2379

This would have the effect of:

• etcdisco would attempt to discover the ip it should be advertising
• it will look over the command line args and replace {{.LOCAL_IP}} with the discovered ip address
• it will invoke etcd with the modified command line args

⁠Supported variables