 vi /usr/lib/systemd/system/docker.service

2：找到 ExecStart，在最后面添加 -H tcp://0.0.0.0:2375

# for containers run by docker
ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock -H tcp://0.0.0.0:2375
ExecReload=/bin/kill -s HUP $MAINPID
TimeoutSec=0
RestartSec=2
Restart=always

3：开放系统端口

3-1：关闭防火墙

systemctl stop firewalld

3-2：防火墙开放端口

添加 --permanent永久生效，没有此参数重启后失效

重新载入

查看所有打开的端口：

firewall-cmd --zone=public --list-ports

4：重启docker

4-1：如果docker启动了执行命令

[root@localhost ~]# systemctl stop docker.socket

4-2：执行启动命令

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

4-3：通过docker启动状态可以查看是否读取了配置文件和开启了监听2375端口

[root@localhost ~]# systemctl status docker
● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
   Active: active (running) since 二 2023-08-22 17:46:00 CST; 14s ago
     Docs: https://docs.docker.com
 Main PID: 8219 (dockerd)
    Tasks: 7
   Memory: 24.3M
   CGroup: /system.slice/docker.service
           └─8219 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock -H tcp://0.0.0.0:2375

8月 22 17:46:00 localhost.localdomain dockerd[8219]: time="2023-08-22T17:46:00.266423902+08:00" level=info msg="ClientConn switching balancer to \"pick_first\"" module=grpc
8月 22 17:46:00 localhost.localdomain dockerd[8219]: time="2023-08-22T17:46:00.290199031+08:00" level=info msg="[graphdriver] using prior storage driver: overlay2"
8月 22 17:46:00 localhost.localdomain dockerd[8219]: time="2023-08-22T17:46:00.308690375+08:00" level=info msg="Loading containers: start."
8月 22 17:46:00 localhost.localdomain dockerd[8219]: time="2023-08-22T17:46:00.499669329+08:00" level=info msg="Default bridge (docker0) is assigned with an IP address 172.17.0...IP address"
8月 22 17:46:00 localhost.localdomain dockerd[8219]: time="2023-08-22T17:46:00.527983877+08:00" level=info msg="Loading containers: done."
8月 22 17:46:00 localhost.localdomain dockerd[8219]: time="2023-08-22T17:46:00.562405494+08:00" level=info msg="Docker daemon" commit=3056208 graphdriver(s)=overlay2 version=20.10.21
8月 22 17:46:00 localhost.localdomain dockerd[8219]: time="2023-08-22T17:46:00.562786361+08:00" level=info msg="Daemon has completed initialization"
8月 22 17:46:00 localhost.localdomain systemd[1]: Started Docker Application Container Engine.
8月 22 17:46:00 localhost.localdomain dockerd[8219]: time="2023-08-22T17:46:00.601480387+08:00" level=info msg="API listen on /var/run/docker.sock"
8月 22 17:46:00 localhost.localdomain dockerd[8219]: time="2023-08-22T17:46:00.602129704+08:00" level=info msg="API listen on [::]:2375"
Hint: Some lines were ellipsized, use -l to show in full.
[root@localhost ~]#

4-4：通过curl http://docker宿主机IP:2375/version验证是否可以远程连接docker

[root@localhost ~]# curl http://192.168.11.48:2375/version
{"Platform":{"Name":"Docker Engine - Community"},"Components":[{"Name":"Engine","Version":"20.10.21","Details":{"ApiVersion":"1.41","Arch":"amd64","BuildTime":"2022-10-25T18:02:38.000000000+00ommit":"3056208","GoVersion":"go1.18.7","KernelVersion":"3.10.0-1160.el7.x86_64","MinAPIVersion":"1.12","Os":"linux"}},{"Name":"containerd","Version":"1.6.10","Details":{"GitCommit":"770bd0108},{"Name":"runc","Version":"1.1.4","Details":{"GitCommit":"v1.1.4-0-g5fd4c4d"}},{"Name":"docker-init","Version":"0.19.0","Details":{"GitCommit":"de40ad0"}}],"Version":"20.10.21","ApiVersion":"Commit":"3056208","GoVersion":"go1.18.7","Os":"linux","Arch":"amd64","KernelVersion":"3.10.0-1160.el7.x86_64","BuildTime":"2022-10-25T18:02:38.000000000+00:00"}
[root@localhost ~]#