Prepare Config Service

Backend.AI makes use of Etcd as the distributed configuration store. Launch the service using docker compose by generating the file $HOME/halfstack/etcd-cluster-default/docker-compose.yaml and populating it with the following YAML. Feel free to adjust the volume paths and port settings. Please refer the latest configuration (it’s a symbolic link so follow the filename in it) if needed.

x-base: &base
   logging:
      driver: "json-file"
      options:
         max-file: "5"
         max-size: "10m"

services:
   backendai-half-etcd:
      <<: *base
      container_name: backendai-halfstack-etcd
      image: quay.io/coreos/etcd:v3.4.15
      restart: unless-stopped
      command: >
         /usr/local/bin/etcd
         --name etcd-node01
         --data-dir /etcd-data
         --listen-client-urls http://0.0.0.0:2379
         --advertise-client-urls http://0.0.0.0:8120
         --listen-peer-urls http://0.0.0.0:2380
         --initial-advertise-peer-urls http://0.0.0.0:8320
         --initial-cluster etcd-node01=http://0.0.0.0:8320
         --initial-cluster-token backendai-etcd-token
         --initial-cluster-state new
         --auto-compaction-retention 1
      volumes:
         - "${HOME}/.data/backend.ai/etcd-data:/etcd-data:rw"
      healthcheck:
         test: ["CMD", "etcdctl", "endpoint", "health"]
         interval: 10s
         timeout: 3s
         retries: 10
      ports:
         - "8120:2379"
         # - "8320:2380"  # listen peer (only if required)
      networks:
         - half_stack
      cpu_count: 1
      mem_limit: "1g"

networks:
   half_stack:

Execute the following command to start the service container. The project ${USER} is added for operational convenience.

$ cd ${HOME}/halfstack/etcd-cluster-default
$ docker compose up -d
$ # -- To terminate the container:
$ # docker compose down
$ # -- To see the container logs:
$ # docker compose logs -f