zookeeper の起動と起動確認 docker compose

README.md

ZooKeeper 3-node Cluster (Docker Compose)

This sets up a 3-node ZooKeeper cluster using the official Docker Hub zookeeper:3.8.4 image.

Quick Start

cd /home/kawai/iceberg-poc/iced
docker compose up -d

• Node ports: zookeeper1 exposes client port 2181 on the host. Other nodes are accessible internally on the network.
• Cluster peer ports: 2888 and 3888 are used internally for quorum and leader election.

Check Status

# View logs
docker compose logs -f zookeeper1

# Check ensemble from inside a container
docker compose ps
# Pick the actual container name for zookeeper1 and run:
# docker exec -it <container_name> zkCli.sh -server zookeeper1:2181
# In the shell, try:
# stat /   or   ls /
 
# Automated check container (optional)
# Starts a helper that retries zkCli until ZooKeeper is ready
docker compose up -d zk-checker
docker compose logs -f zk-checker

Stop and Clean Up

docker compose down

Notes

• Each node has a unique ZOO_MY_ID and the same ZOO_SERVERS list.
• Authentication is disabled (ALLOW_ANONYMOUS_LOGIN=yes) for simplicity. Enable auth if needed.

docker-compose.yml

version: "3.8"

services:
  zookeeper1:
    image: zookeeper:3.8.4
    container_name: zookeeper1
    environment:
      - ZOO_MY_ID=1
      - ZOO_SERVERS=server.1=zookeeper1:2888:3888;2181 server.2=zookeeper2:2888:3888;2181 server.3=zookeeper3:2888:3888;2181
      - ZOO_STANDALONE_ENABLED=false
    ports:
      - "2181:2181"
    networks:
      - zk-net

  zookeeper2:
    image: zookeeper:3.8.4
    container_name: zookeeper2
    environment:
      - ZOO_MY_ID=2
      - ZOO_SERVERS=server.1=zookeeper1:2888:3888;2181 server.2=zookeeper2:2888:3888;2181 server.3=zookeeper3:2888:3888;2181
      - ZOO_STANDALONE_ENABLED=false
    networks:
      - zk-net

  zookeeper3:
    image: zookeeper:3.8.4
    container_name: zookeeper3
    environment:
      - ZOO_MY_ID=3
      - ZOO_SERVERS=server.1=zookeeper1:2888:3888;2181 server.2=zookeeper2:2888:3888;2181 server.3=zookeeper3:2888:3888;2181
      - ZOO_STANDALONE_ENABLED=false
    networks:
      - zk-net

  zk-checker:
    image: zookeeper:3.8.4
    container_name: zk-checker
    depends_on:
      - zookeeper1
      - zookeeper2
      - zookeeper3
    networks:
      - zk-net
    entrypoint: ["bash", "-c"]
    # Try connecting to zookeeper1:2181 until success, then exit
    command:
      - |
        for i in $(seq 1 60); do
          echo 'Checking ZooKeeper...'
          zkCli.sh -server zookeeper1:2181 stat / && exit 0 || sleep 2
        done
        echo 'ZooKeeper not ready after retries'
        exit 1

networks:
  zk-net:
    driver: bridge