修改/etc/sysconfig/docker檔案，在最後增加一行DOCKER_OPTS

vim /etc/sysconfig/docker

			
DOCKER_OPTS="-H unix:///var/run/docker.sock -H tcp://0.0.0.0:2375"
			
		

修改/usr/lib/systemd/system/docker.service 在[Service]的ExexStart=下面增加一行$DOCKER_OPTS

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

[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
EnvironmentFile=-/etc/sysconfig/docker
ExecStart=/usr/bin/dockerd $DOCKER_OPTS
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
			
		

重啟 docker

			
[root@localhost ~]# systemctl daemon-reload
[root@localhost ~]# systemctl restart docker			
			
		

查看連接埠

			
[root@localhost ~]# ss -lnt | grep 2375
LISTEN     0      1024        :::2375                    :::*  			
			
		

檢查 docker 信息

			
[root@localhost ~]# curl -s http://localhost:2375/info
{"ID":"YNK5:OJTT:FELN:H4DQ:AG7H:W3RE:WGLD:TOOI:32CH:S6HR:AJ45:4VLZ","Containers":4,"ContainersRunning":0,"ContainersPaused":0,"ContainersStopped":4,"Images":10,"Driver":"btrfs","DriverStatus":[["Build Version","Btrfs v4.9.1"],["Library Version","102"]],"SystemStatus":null,"Plugins":{"Volume":["local"],"Network":["bridge","host","macvlan","null","overlay"],"Authorization":null,"Log":["awslogs","fluentd","gcplogs","gelf","journald","json-file","local","logentries","splunk","syslog"]},"MemoryLimit":true,"SwapLimit":true,"KernelMemory":true,"CpuCfsPeriod":true,"CpuCfsQuota":true,"CPUShares":true,"CPUSet":true,"IPv4Forwarding":true,"BridgeNfIptables":false,"BridgeNfIp6tables":false,"Debug":false,"NFd":23,"OomKillDisable":true,"NGoroutines":37,"SystemTime":"2019-01-24T23:30:56.230913047-05:00","LoggingDriver":"json-file","CgroupDriver":"cgroupfs","NEventsListener":0,"KernelVersion":"3.10.0-693.el7.x86_64","OperatingSystem":"CentOS Linux 7 (Core)","OSType":"linux","Architecture":"x86_64","IndexServerAddress":"https://index.docker.io/v1/","RegistryConfig":{"AllowNondistributableArtifactsCIDRs":[],"AllowNondistributableArtifactsHostnames":[],"InsecureRegistryCIDRs":["127.0.0.0/8"],"IndexConfigs":{"docker.io":{"Name":"docker.io","Mirrors":[],"Secure":true,"Official":true}},"Mirrors":[]},"NCPU":2,"MemTotal":1958645760,"GenericResources":null,"DockerRootDir":"/var/lib/docker","HttpProxy":"","HttpsProxy":"","NoProxy":"","Name":"localhost.localdomain","Labels":[],"ExperimentalBuild":false,"ServerVersion":"18.09.1","ClusterStore":"","ClusterAdvertise":"","Runtimes":{"runc":{"path":"runc"}},"DefaultRuntime":"runc","Swarm":{"NodeID":"","NodeAddr":"","LocalNodeState":"inactive","ControlAvailable":false,"Error":"","RemoteManagers":null},"LiveRestoreEnabled":false,"Isolation":"","InitBinary":"docker-init","ContainerdCommit":{"ID":"9754871865f7fe2f4e74d43e2fc7ccd237edcbce","Expected":"9754871865f7fe2f4e74d43e2fc7ccd237edcbce"},"RuncCommit":{"ID":"96ec2177ae841256168fcf76954f7177af9446eb","Expected":"96ec2177ae841256168fcf76954f7177af9446eb"},"InitCommit":{"ID":"fec3683","Expected":"fec3683"},"SecurityOptions":["name=seccomp,profile=default"],"ProductLicense":"Community Engine","Warnings":["WARNING: API is accessible on http://0.0.0.0:2375 without encryption.\n         Access to the remote API is equivalent to root access on the host. Refer\n         to the 'Docker daemon attack surface' section in the documentation for\n         more information: https://docs.docker.com/engine/security/security/#docker-daemon-attack-surface","WARNING: bridge-nf-call-iptables is disabled","WARNING: bridge-nf-call-ip6tables is disabled"]}			
			
		

/etc/docker/daemon.json

		
"default-ulimits": { "nofile": { "Name": "nofile", "Hard": 128000, "Soft": 128000 } }