解决Jenkins自动部署Docker出现unix://localhost:80: Permission denied

jenkins使用docker-maven-plugin或者dockerfile-maven-plugin进行编译时发现没有权限，具体错误内容如下：

[INFO] I/O exception (java.io.IOException) caught when processing request to {}->unix://localhost:80: Permission denied
[INFO] Retrying request to {}->unix://localhost:80
[INFO] I/O exception (java.io.IOException) caught when processing request to {}->unix://localhost:80: Permission denied
[INFO] Retrying request to {}->unix://localhost:80
[INFO] I/O exception (java.io.IOException) caught when processing request to {}->unix://localhost:80: Permission denied
[INFO] Retrying request to {}->unix://localhost:80

给jenkins用户组一个运行docker的权限即可，修改/lib/systemd/system/docker.service文件，增加启动参数  -G jenkins

/lib/systemd/system/docker.service：

[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
BindsTo=containerd.service
After=network-online.target firewalld.service
Wants=network-online.target

[Service]
Type=notify
# the default is not to use systemd for cgroups because the delegate issues still
# exists and systemd currently does not support the cgroup feature set required
# for containers run by docker
ExecStart=/usr/bin/dockerd -H unix:///var/run/docker.sock -H tcp://0.0.0.0:2375 -G jenkins
ExecReload=/bin/kill -s HUP $MAINPID
TimeoutSec=0
RestartSec=2
Restart=always

# Note that StartLimit* options were moved from "Service" to "Unit" in systemd 229.
# Both the old, and new location are accepted by systemd 229 and up, so using the old location
# to make them work for either version of systemd.
StartLimitBurst=3

# Note that StartLimitInterval was renamed to StartLimitIntervalSec in systemd 230.
# Both the old, and new name are accepted by systemd 230 and up, so using the old name to make
# this option work for either version of systemd.
StartLimitInterval=60s

# Having non-zero Limit*s causes performance problems due to accounting overhead
# in the kernel. We recommend using cgroups to do container-local accounting.
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity

# Comment TasksMax if your systemd version does not supports it.
# Only systemd 226 and above support this option.
TasksMax=infinity

# set delegate yes so that systemd does not reset the cgroups of docker containers
Delegate=yes

# kill only the docker process, not all processes in the cgroup
KillMode=process

[Install]
WantedBy=multi-user.target
~

重新启动服务

$ systemctl daemon-reload
$ systemctl restart docker

再次编译项目成功，上面的是Jenkins和Docker在同一服务的情况，所有还是存在一个问题，如果发布到远程的Docker上？