multi piston in progress

var/dock@.service

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+[Unit]
+Description=Docker Application Container Engine
+Documentation=http://docs.docker.com
+After=network.target
+Wants=docker-storage-setup.service
+Requires=docker-cleanup.timer
+
+[Service]
+Type=notify
+NotifyAccess=main
+EnvironmentFile=-/run/containers/registries.conf
+EnvironmentFile=-/etc/sysconfig/docker
+EnvironmentFile=-/etc/sysconfig/docker-storage
+EnvironmentFile=-/etc/sysconfig/docker-network
+Environment=GOTRACEBACK=crash
+Environment=DOCKER_HTTP_HOST_COMPAT=1
+Environment=PATH=/usr/libexec/docker:/usr/bin:/usr/sbin
+ExecStart=/usr/bin/dockerd-current \
+          --add-runtime docker-runc=/usr/libexec/docker/docker-runc-current \
+          --default-runtime=docker-runc \
+          --exec-opt native.cgroupdriver=systemd \
+          --userland-proxy-path=/usr/libexec/docker/docker-proxy-current \
+          --init-path=/usr/libexec/docker/docker-init-current \
+          --seccomp-profile=/etc/docker/seccomp.json \
+          --exec-root=/var/run/docker-%i \
+          --graph=/var/lib/docker-%i \
+          --host unix:///var/run/docker-%i.sock \
+          --pidfile /var/run/docker-%i.pid \
+          $OPTIONS \
+          $DOCKER_STORAGE_OPTIONS \
+          $DOCKER_NETWORK_OPTIONS \
+          $ADD_REGISTRY \
+          $BLOCK_REGISTRY \
+          $INSECURE_REGISTRY \
+          $REGISTRIES
+ExecReload=/bin/kill -s HUP $MAINPID
+LimitNOFILE=1048576
+LimitNPROC=1048576
+LimitCORE=infinity
+TimeoutStartSec=0
+Restart=on-abnormal
+KillMode=process
+
+[Install]
+WantedBy=multi-user.target