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k8s-etcd

Docker container to run etcd (0.4.6) in an Ubuntu 14.04 container with configuration settings from the environment.

environment

The names of these environment variables are carefully chosen for compatibility with what Kubernetes (primarily GKE) provides for defined services.

  • ETCD_SERVER_ID: required, integer 1..cluster size
  • for each etcd instance in the cluster
    • ETCD_CLIENT_<i>_SERVICE_HOST: IP address of the etcd instance
    • ETCD_CLIENT_<i>_SERVICE_PORT: port number of the etcd client service (4001)
    • ETCD_PEER_<i>_SERVICE_HOST: IP address of the etcd instance
    • ETCD_PEER_<i>_SERVICE_PORT: port number of the etcd client service

notes

To start a two node cluster, run this to start the first node:

HOST_IP=$(ip ro get 8.8.8.8 | grep -oP "(?<=src )(\S+)")
docker run \
 -p 4002:4001 \
 -p 7002:7001 \
 -e ETCD_SERVER_ID=1 \
 -e ETCD_CLIENT_1_SERVICE_HOST=`ip ro get 8.8.8.8 | grep -oP "(?<=src )(\S+)"` \
 -e ETCD_CLIENT_1_SERVICE_PORT=4002 \
 -e ETCD_PEER_1_SERVICE_HOST=`ip ro get 8.8.8.8 | grep -oP "(?<=src )(\S+)"` \
 -e ETCD_PEER_1_SERVICE_PORT=7002 \
 -e ETCD_CLIENT_2_SERVICE_HOST=`ip ro get 8.8.8.8 | grep -oP "(?<=src )(\S+)"` \
 -e ETCD_CLIENT_2_SERVICE_PORT=4003 \
 -e ETCD_PEER_2_SERVICE_HOST=`ip ro get 8.8.8.8 | grep -oP "(?<=src )(\S+)"` \
 -e ETCD_PEER_2_SERVICE_PORT=7003 \
 graemej/k8s-etcd

and this to start the second one:

docker run \
 -p 4003:4001 \
 -p 7003:7001 \
 -e ETCD_SERVER_ID=2 \
 -e ETCD_CLIENT_1_SERVICE_HOST=`ip ro get 8.8.8.8 | grep -oP "(?<=src )(\S+)"` \
 -e ETCD_CLIENT_1_SERVICE_PORT=4002 \
 -e ETCD_PEER_1_SERVICE_HOST=`ip ro get 8.8.8.8 | grep -oP "(?<=src )(\S+)"` \
 -e ETCD_PEER_1_SERVICE_PORT=7002 \
 -e ETCD_CLIENT_2_SERVICE_HOST=`ip ro get 8.8.8.8 | grep -oP "(?<=src )(\S+)"` \
 -e ETCD_CLIENT_2_SERVICE_PORT=4003 \
 -e ETCD_PEER_2_SERVICE_HOST=`ip ro get 8.8.8.8 | grep -oP "(?<=src )(\S+)"` \
 -e ETCD_PEER_2_SERVICE_PORT=7003 \
 graemej/k8s-etcd
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wokim
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