etcd cluster docker compose

docker-compose.yaml

x-variables:
    flag_initial_cluster_token: &flag_initial_cluster_token '--initial-cluster-token=mys3cr3ttok3n'
    common_settings: &common_settings
        image: quay.io/coreos/etcd:v3.5.9
        entrypoint: /usr/local/bin/etcd
        ports:
            - 2379

services:
    etcd-1:
        <<: *common_settings
        command:
            - '--name=etcd-1'
            - '--initial-advertise-peer-urls=http://etcd-1:2380'
            - '--listen-peer-urls=http://0.0.0.0:2380'
            - '--listen-client-urls=http://0.0.0.0:2379'
            - '--advertise-client-urls=http://etcd-1:2379'
            - '--heartbeat-interval=250'
            - '--election-timeout=1250'
            - '--initial-cluster=etcd-1=http://etcd-1:2380,etcd-2=http://etcd-2:2380,etcd-3=http://etcd-3:2380'
            - '--initial-cluster-state=new'
            - *flag_initial_cluster_token
        volumes:
            - etcd1:/etcd_data

    etcd-2:
        <<: *common_settings
        command:
            - '--name=etcd-2'
            - '--initial-advertise-peer-urls=http://etcd-2:2380'
            - '--listen-peer-urls=http://0.0.0.0:2380'
            - '--listen-client-urls=http://0.0.0.0:2379'
            - '--advertise-client-urls=http://etcd-2:2379'
            - '--heartbeat-interval=250'
            - '--election-timeout=1250'
            - '--initial-cluster=etcd-1=http://etcd-1:2380,etcd-2=http://etcd-2:2380,etcd-3=http://etcd-3:2380'
            - '--initial-cluster-state=new'
            - *flag_initial_cluster_token
        volumes:
            - etcd2:/etcd_data

    etcd-3:
        <<: *common_settings
        command:
            - '--name=etcd-3'
            - '--initial-advertise-peer-urls=http://etcd-3:2380'
            - '--listen-peer-urls=http://0.0.0.0:2380'
            - '--listen-client-urls=http://0.0.0.0:2379'
            - '--advertise-client-urls=http://etcd-3:2379'
            - '--heartbeat-interval=250'
            - '--election-timeout=1250'
            - '--initial-cluster=etcd-1=http://etcd-1:2380,etcd-2=http://etcd-2:2380,etcd-3=http://etcd-3:2380'
            - '--initial-cluster-state=new'
            - *flag_initial_cluster_token
        volumes:
            - etcd3:/etcd_data

volumes:
    etcd1:
    etcd2:
    etcd3: