--- title: Run etcd clusters inside containers --- The following guide shows how to run etcd with rkt and Docker using the [static bootstrap process](clustering.md#static). ## rkt ### Running a single node etcd The following rkt run command will expose the etcd client API on port 2379 and expose the peer API on port 2380. Use the host IP address when configuring etcd. ``` export NODE1=192.168.1.21 ``` Trust the CoreOS [App Signing Key](https://coreos.com/security/app-signing-key/). ``` sudo rkt trust --prefix quay.io/coreos/etcd # gpg key fingerprint is: 18AD 5014 C99E F7E3 BA5F 6CE9 50BD D3E0 FC8A 365E ``` Run the `v3.2` version of etcd or specify another release version. ``` sudo rkt run --net=default:IP=${NODE1} quay.io/coreos/etcd:v3.2 -- -name=node1 -advertise-client-urls=http://${NODE1}:2379 -initial-advertise-peer-urls=http://${NODE1}:2380 -listen-client-urls=http://0.0.0.0:2379 -listen-peer-urls=http://${NODE1}:2380 -initial-cluster=node1=http://${NODE1}:2380 ``` List the cluster member. ``` etcdctl --endpoints=http://192.168.1.21:2379 member list ``` ### Running a 3 node etcd cluster Setup a 3 node cluster with rkt locally, using the `-initial-cluster` flag. ```sh export NODE1=172.16.28.21 export NODE2=172.16.28.22 export NODE3=172.16.28.23 ``` ``` # node 1 sudo rkt run --net=default:IP=${NODE1} quay.io/coreos/etcd:v3.2 -- -name=node1 -advertise-client-urls=http://${NODE1}:2379 -initial-advertise-peer-urls=http://${NODE1}:2380 -listen-client-urls=http://0.0.0.0:2379 -listen-peer-urls=http://${NODE1}:2380 -initial-cluster=node1=http://${NODE1}:2380,node2=http://${NODE2}:2380,node3=http://${NODE3}:2380 # node 2 sudo rkt run --net=default:IP=${NODE2} quay.io/coreos/etcd:v3.2 -- -name=node2 -advertise-client-urls=http://${NODE2}:2379 -initial-advertise-peer-urls=http://${NODE2}:2380 -listen-client-urls=http://0.0.0.0:2379 -listen-peer-urls=http://${NODE2}:2380 -initial-cluster=node1=http://${NODE1}:2380,node2=http://${NODE2}:2380,node3=http://${NODE3}:2380 # node 3 sudo rkt run --net=default:IP=${NODE3} quay.io/coreos/etcd:v3.2 -- -name=node3 -advertise-client-urls=http://${NODE3}:2379 -initial-advertise-peer-urls=http://${NODE3}:2380 -listen-client-urls=http://0.0.0.0:2379 -listen-peer-urls=http://${NODE3}:2380 -initial-cluster=node1=http://${NODE1}:2380,node2=http://${NODE2}:2380,node3=http://${NODE3}:2380 ``` Verify the cluster is healthy and can be reached. ``` ETCDCTL_API=3 etcdctl --endpoints=http://172.16.28.21:2379,http://172.16.28.22:2379,http://172.16.28.23:2379 endpoint health ``` ### DNS Production clusters which refer to peers by DNS name known to the local resolver must mount the [host's DNS configuration](https://coreos.com/kubernetes/docs/latest/kubelet-wrapper.html#customizing-rkt-options). ## 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`](https://docs.docker.com/engine/reference/commandline/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. ### Running a single node etcd Use the host IP address when configuring etcd: ``` export NODE1=192.168.1.21 ``` Configure a Docker volume to store etcd data: ``` docker volume create --name etcd-data export DATA_DIR="etcd-data" ``` Run the latest version of etcd: ``` REGISTRY=quay.io/coreos/etcd # available from v3.2.5 REGISTRY=gcr.io/etcd-development/etcd docker run \ -p 2379:2379 \ -p 2380:2380 \ --volume=${DATA_DIR}:/etcd-data \ --name etcd ${REGISTRY}:latest \ /usr/local/bin/etcd \ --data-dir=/etcd-data --name node1 \  --initial-advertise-peer-urls http://${NODE1}:2380 --listen-peer-urls http://0.0.0.0:2380 \  --advertise-client-urls http://${NODE1}:2379 --listen-client-urls http://0.0.0.0:2379 \ --initial-cluster node1=http://${NODE1}:2380 ``` List the cluster member: ``` etcdctl --endpoints=http://${NODE1}:2379 member list ``` ### Running a 3 node etcd cluster ``` REGISTRY=quay.io/coreos/etcd # available from v3.2.5 REGISTRY=gcr.io/etcd-development/etcd # For each machine ETCD_VERSION=latest TOKEN=my-etcd-token CLUSTER_STATE=new NAME_1=etcd-node-0 NAME_2=etcd-node-1 NAME_3=etcd-node-2 HOST_1=10.20.30.1 HOST_2=10.20.30.2 HOST_3=10.20.30.3 CLUSTER=${NAME_1}=http://${HOST_1}:2380,${NAME_2}=http://${HOST_2}:2380,${NAME_3}=http://${HOST_3}:2380 DATA_DIR=/var/lib/etcd # For node 1 THIS_NAME=${NAME_1} THIS_IP=${HOST_1} docker run \ -p 2379:2379 \ -p 2380:2380 \ --volume=${DATA_DIR}:/etcd-data \ --name etcd ${REGISTRY}:${ETCD_VERSION} \ /usr/local/bin/etcd \ --data-dir=/etcd-data --name ${THIS_NAME} \  --initial-advertise-peer-urls http://${THIS_IP}:2380 --listen-peer-urls http://0.0.0.0:2380 \  --advertise-client-urls http://${THIS_IP}:2379 --listen-client-urls http://0.0.0.0:2379 \ --initial-cluster ${CLUSTER} \ --initial-cluster-state ${CLUSTER_STATE} --initial-cluster-token ${TOKEN} # For node 2 THIS_NAME=${NAME_2} THIS_IP=${HOST_2} docker run \ -p 2379:2379 \ -p 2380:2380 \ --volume=${DATA_DIR}:/etcd-data \ --name etcd ${REGISTRY}:${ETCD_VERSION} \ /usr/local/bin/etcd \ --data-dir=/etcd-data --name ${THIS_NAME} \  --initial-advertise-peer-urls http://${THIS_IP}:2380 --listen-peer-urls http://0.0.0.0:2380 \  --advertise-client-urls http://${THIS_IP}:2379 --listen-client-urls http://0.0.0.0:2379 \ --initial-cluster ${CLUSTER} \ --initial-cluster-state ${CLUSTER_STATE} --initial-cluster-token ${TOKEN} # For node 3 THIS_NAME=${NAME_3} THIS_IP=${HOST_3} docker run \ -p 2379:2379 \ -p 2380:2380 \ --volume=${DATA_DIR}:/etcd-data \ --name etcd ${REGISTRY}:${ETCD_VERSION} \ /usr/local/bin/etcd \ --data-dir=/etcd-data --name ${THIS_NAME} \  --initial-advertise-peer-urls http://${THIS_IP}:2380 --listen-peer-urls http://0.0.0.0:2380 \  --advertise-client-urls http://${THIS_IP}:2379 --listen-client-urls http://0.0.0.0:2379 \ --initial-cluster ${CLUSTER} \ --initial-cluster-state ${CLUSTER_STATE} --initial-cluster-token ${TOKEN} ``` To run `etcdctl` using API version 3: ``` docker exec etcd /bin/sh -c "export ETCDCTL_API=3 && /usr/local/bin/etcdctl put foo bar" ``` ## Bare Metal To provision a 3 node etcd cluster on bare-metal, the examples in the [baremetal repo](https://github.com/coreos/coreos-baremetal/tree/master/examples) may be useful. ## Mounting a certificate volume The etcd release container does not include default root certificates. To use HTTPS with certificates trusted by a root authority (e.g., for discovery), mount a certificate directory into the etcd container: ``` REGISTRY=quay.io/coreos/etcd # available from v3.2.5 REGISTRY=docker://gcr.io/etcd-development/etcd rkt run \ --insecure-options=image \ --volume etcd-ssl-certs-bundle,kind=host,source=/etc/ssl/certs/ca-certificates.crt \ --mount volume=etcd-ssl-certs-bundle,target=/etc/ssl/certs/ca-certificates.crt \ ${REGISTRY}:latest -- --name my-name \ --initial-advertise-peer-urls http://localhost:2380 --listen-peer-urls http://localhost:2380 \ --advertise-client-urls http://localhost:2379 --listen-client-urls http://localhost:2379 \ --discovery https://discovery.etcd.io/c11fbcdc16972e45253491a24fcf45e1 ``` ``` REGISTRY=quay.io/coreos/etcd # available from v3.2.5 REGISTRY=gcr.io/etcd-development/etcd docker run \ -p 2379:2379 \ -p 2380:2380 \ --volume=/etc/ssl/certs/ca-certificates.crt:/etc/ssl/certs/ca-certificates.crt \ ${REGISTRY}:latest \ /usr/local/bin/etcd --name my-name \ --initial-advertise-peer-urls http://localhost:2380 --listen-peer-urls http://localhost:2380 \ --advertise-client-urls http://localhost:2379 --listen-client-urls http://localhost:2379 \ --discovery https://discovery.etcd.io/86a9ff6c8cb8b4c4544c1a2f88f8b801 ```