docker 开放 2375端口

[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 tcp://0.0.0.0:2375 -H fd:// --containerd=/run/containerd/containerd.sock

systemctl daemon-reload
systemctl restart docker

[root@localhost ~]# netstat -ano | grep 2375
tcp6       0      0 :::2375                 :::*                    LISTEN      off (0.00/0/0)

[root@localhost ~]# netstat -tulp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 0.0.0.0:ssh             0.0.0.0:*               LISTEN      3124/sshd           
tcp        0      0 localhost:smtp          0.0.0.0:*               LISTEN      3379/master         
tcp6       0      0 [::]:2375               [::]:*                  LISTEN      13964/dockerd       

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