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k8s-kafka

Docker container to run kafka (0.8.1.1) in an Ubuntu container (java7) 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.

  • KAFKA_SERVER_ID: required, integer 1..cluster size
  • for each Kafka instance in the cluster
    • KAFKA_CLIENT_<i>_SERVICE_HOST: IP address of the etcd instance
    • KAFKA_CLIENT_<i>_SERVICE_PORT: port number of the etcd client service (4001)
  • for each Zookeeper instance
    • ZK_CLIENT_<i>_SERVICE_HOST: IP address of the Zookeeper instance
    • ZK_CLIENT_<i>_SERVICE_PORT: port number of the Zookeeper client service

notes

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

env HOST_IP=`ip ro get 8.8.8.8 | grep -oP "(?<=src )(\S+)"` \
 docker run \
  -P \
  -e ZK_SERVER_ID=1 \
  -e ZK_CLIENT_SERVICE_PORT=2181 \
  -e ZK_CLIENT_1_SERVICE_HOST=${HOST_IP} \
  -e ZK_CLIENT_1_SERVICE_PORT=2181 \
  -e ZK_PEER_1_SERVICE_HOST=${HOST_IP} \
  -e ZK_PEER_1_SERVICE_PORT=2888 \
  -e ZK_ELECTION_1_SERVICE_HOST=${HOST_IP} \
  -e ZK_ELECTION_1_SERVICE_PORT=3888 \
  fabric8/zookeeper

Now bring up the first Kafka node:

docker run \
 -P \
 -e KAFKA_SERVER_ID=1 \
 -e KAFKA_CLIENT_1_SERVICE_HOST=`ip ro get 8.8.8.8 | grep -oP "(?<=src )(\S+)"` \
 -e KAFKA_CLIENT_1_SERVICE_PORT=9093 \
 -e ZK_CLIENT_1_SERVICE_HOST=`ip ro get 8.8.8.8 | grep -oP "(?<=src )(\S+)"` \
 -e ZK_CLIENT_1_SERVICE_PORT=2181 \
 graemej/k8s-kafka

and the second Kafka node:

docker run \
 -P \
 -e KAFKA_SERVER_ID=2 \
 -e KAFKA_CLIENT_2_SERVICE_HOST=`ip ro get 8.8.8.8 | grep -oP "(?<=src )(\S+)"` \
 -e KAFKA_CLIENT_2_SERVICE_PORT=9094 \
 -e ZK_CLIENT_1_SERVICE_HOST=`ip ro get 8.8.8.8 | grep -oP "(?<=src )(\S+)"` \
 -e ZK_CLIENT_1_SERVICE_PORT=2181 \
 graemej/k8s-kafka