Consul Server bootstrap using Fleet and bash scripting

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    - name: [email protected]
      content: |
        [Unit]
        Description=Consul Server

        # Requirements
        Requires=docker.service
        Requires=fleet.service
        Requires=consul-discovery@%i.service

        # Dependency ordering and binding
        After=docker.service
        After=fleet.service
        Before=consul-discovery@%i.service

        [Service]
        TimeoutStartSec=0
##        TimeoutStopSec=90s

        Restart=on-failure
        RestartSec=10s

        # Get CoreOS environmental variables
        EnvironmentFile=/etc/environment

        ExecStartPre=-/usr/bin/docker kill %p
        ExecStartPre=-/usr/bin/docker rm %p
        ExecStartPre=/usr/bin/docker pull progrium/consul

        ExecStart=/usr/bin/bash -c '\
                log_tag="%p"; \
                if [ %i -eq 1 ]; then \
                  logger -t "$log_tag" "Starting initial consul server at ${COREOS_PRIVATE_IPV4}"; \
                  $(docker run --rm -e EXPECT=3 progrium/consul cmd:run ${COREOS_PRIVATE_IPV4} --name %p -v /mnt:/data); \
                else \
                  primary_ip=$(fleetctl list-units --fields=unit,sub,machine | grep -E "%[email protected]" | sed -r "s/.*\/(.+?)/\1/"); \
                  logger -t "$log_tag" "Starting secondary consul server: $primary_ip"; \
                  $(docker run --rm progrium/consul cmd:run ${COREOS_PRIVATE_IPV4}::$primary_ip --name %p -v /mnt:/data); \
                fi; '
        
        ExecStop=-/usr/bin/docker exec %p consul leave
        ExecStop=-/usr/bin/docker stop -t 30 %p
        ExecStop=-/usr/bin/docker rm %p

        [X-Fleet]
        Conflicts=%p@*.service