How to run etcd cluster in docker using ansible?

I’m trying to run etcd cluster in docker via ansible.

I use docker_container ansible module and this is what I have:

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  • - name: Run etcd KV node
          docker_container:
            name: "etcd0"
            image: quay.io/coreos/etcd
            network_mode: host
            command: [ "/usr/local/bin/etcd", \
            "-name etcd0", \
            "-advertise-client-urls http://{{ ansible_default_ipv4['address'] }}:2379,http://{{ ansible_default_ipv4['address'] }}:4001", \
            "-listen-client-urls http://0.0.0.0:2379,http://0.0.0.0:4001", \
            "-initial-advertise-peer-urls http://{{ ansible_default_ipv4['address'] }}:2380", \
            "-initial-cluster etcd0=http://{{ ansible_default_ipv4['address'] }}:2380", \
            "-initial-cluster-token etcd-cluster", \
            "-listen-peer-urls http://0.0.0.0:2380", \
            "-initial-cluster-state new" ]
    

    This work in single mode, but troubles come with more than 1 node because there is etcd parameter -initial-cluster which should contain all nodes, for example, in case of 3 nodes:

    -initial-cluster etcd0=http://192.168.12.50:2380,etcd1=http://192.168.12.51:2380,etcd2=http://192.168.12.52:2380
    

    I have no idea how to loop thru all nodes and build this string to run one docker container. Is it possible?

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  • One Solution collect form web for “How to run etcd cluster in docker using ansible?”

    hostvars magic variable at your service:

    - name: Generate useful facts for current node 1
      set_fact:
        ip_addr: "{{ ansible_default_ipv4.address }}"
        etcd_name: "etcd{{ ansible_play_hosts.index(inventory_hostname) }}"
    
    - name: Generate useful facts for current node 2
      set_fact:
        etcd_uri: "{{ etcd_name }}=http://{{ ip_addr }}:2380"
    
    - name: Run etcd KV node
      docker_container:
        name: "{{ etcd_name }}"
        image: quay.io/coreos/etcd
        network_mode: host
        command:
          - /usr/local/bin/etcd
          - -name {{ etcd_name }}
          - -advertise-client-urls http://{{ ip_addr }}:2379,http://{{ ip_addr }}:4001
          - -listen-client-urls http://0.0.0.0:2379,http://0.0.0.0:4001
          - -initial-advertise-peer-urls http://{{ ip_addr }}:2380
          - -initial-cluster {{ ansible_play_hosts | map('extract',hostvars,'etcd_uri') | list | join(',') }}
          - -initial-cluster-token etcd-cluster
          - -listen-peer-urls http://0.0.0.0:2380
          - -initial-cluster-state new
    

    P.S. I also reformatted your command argument a bit.

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