Docker 开启2375端口提供外部访问

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

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

[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 fd:// --containerd=/run/containerd/containerd.sock -H tcp://0.0.0.
0:2375 -H unix://var/run/docker.sock
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

[root@docker-servers ~]# systemctl daemon-reload
[root@docker-servers ~]# systemctl restart docker
[root@docker-servers ~]# netstat -tunlp | grep 2375
tcp6       0      0 :::2375                 :::*                    LISTEN      96681/dockerd

[root@localhost ~]# firewall-cmd --zone=public --add-port=2375/tcp --permanent
success