etcd/Documentation/op-guide/container.md

Run etcd clusters inside containers

The following guide shows how to run etcd with rkt and Docker using the static bootstrap process.

Docker

In order to expose the etcd API to clients outside of Docker host, use the host IP address of the container. Please see docker inspect for more detail on how to get the IP address. Alternatively, specify --net=host flag to docker run command to skip placing the container inside of a separate network stack.

# For each machine
ETCD_VERSION=v3.0.0-beta.0
TOKEN=my-etcd-token
CLUSTER_STATE=new
NAME_1=etcd-node-0
NAME_2=etcd-node-1
NAME_3=etcd-node-2
HOST_1=10.20.30.1
HOST_2=10.20.30.2
HOST_3=10.20.30.3
CLUSTER=${NAME_1}=http://${HOST_1}:2380,${NAME_2}=http://${HOST_2}:2380,${NAME_3}=http://${HOST_3}:2380

# For node 1
THIS_NAME=${NAME_1}
THIS_IP=${HOST_1}
sudo docker run --net=host --name etcd quay.io/coreos/etcd:${ETCD_VERSION} \
    --data-dir=data.etcd --name ${THIS_NAME} \
	--initial-advertise-peer-urls http://${THIS_IP}:2380 --listen-peer-urls http://${THIS_IP}:2380 \
	--advertise-client-urls http://${THIS_IP}:2379 --listen-client-urls http://${THIS_IP}:2379 \
	--initial-cluster ${CLUSTER} \
	--initial-cluster-state ${CLUSTER_STATE} --initial-cluster-token ${TOKEN}

# For node 2
THIS_NAME=${NAME_2}
THIS_IP=${HOST_2}
sudo docker run --net=host --name etcd quay.io/coreos/etcd:${ETCD_VERSION} \
    --data-dir=data.etcd --name ${THIS_NAME} \
	--initial-advertise-peer-urls http://${THIS_IP}:2380 --listen-peer-urls http://${THIS_IP}:2380 \
	--advertise-client-urls http://${THIS_IP}:2379 --listen-client-urls http://${THIS_IP}:2379 \
	--initial-cluster ${CLUSTER} \
	--initial-cluster-state ${CLUSTER_STATE} --initial-cluster-token ${TOKEN}

# For node 3
THIS_NAME=${NAME_3}
THIS_IP=${HOST_3}
sudo docker run --net=host --name etcd quay.io/coreos/etcd:${ETCD_VERSION} \
    --data-dir=data.etcd --name ${THIS_NAME} \
	--initial-advertise-peer-urls http://${THIS_IP}:2380 --listen-peer-urls http://${THIS_IP}:2380 \
	--advertise-client-urls http://${THIS_IP}:2379 --listen-client-urls http://${THIS_IP}:2379 \
	--initial-cluster ${CLUSTER} \
	--initial-cluster-state ${CLUSTER_STATE} --initial-cluster-token ${TOKEN}

TODO: current etcd docker container is shipped with etcdctl, but the ETCDCTL_API environment value is not set inside the container. So currently there's no way to use etcdctl for v3 directly from the container (e.g. docker exec etcd /etcdctl put foo bar won't work).