Docker login Harbor报错解决：Error response from daemon: Get https://.. 443: connect: connection refused

报错信息：

[root@localhost harbor]# docker login 192.168.2.195
Username: admin
Password: 
Error response from daemon: Get https://192.168.2.195/v2/: 
dial tcp 192.168.2.195:443: connect: connection refused

查看Docker版本：

[root@localhost ~]# docker version
Client: Docker Engine - Community
 Version:           19.03.8
 API version:       1.40
 Go version:        go1.12.17
 Git commit:        afacb8b
 Built:             Wed Mar 11 01:27:04 2020
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          19.03.8
  API version:      1.40 (minimum version 1.12)
  Go version:       go1.12.17
  Git commit:       afacb8b
  Built:            Wed Mar 11 01:25:42 2020
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.2.13
  GitCommit:        7ad184331fa3e55e52b890ea95e65ba581ae3429
 runc:
  Version:          1.0.0-rc10
  GitCommit:        dc9208a3303feef5b3839f4323d9beb36df0a9dd
 docker-init:
  Version:          0.18.0
  GitCommit:        fec3683

停止harbor：

 docker-compose down -v：停止并移除整个project的所有services

[root@localhost harbor]# docker-compose down -v
Stopping harbor-jobservice  ... done
Stopping nginx              ... done
Stopping harbor-ui          ... done
Stopping redis              ... done

查找docker.service所在位置：

[root@localhost harbor]# find / -name docker.service -type f
/usr/lib/systemd/system/docker.service

修改docker.service配置文件：

 添加 --insecure-registry=192.168.2.195 配置

[root@localhost harbor]# vim /usr/lib/systemd/system/docker.service
[Unit]
Documentation=http://docs.docker.io     //需修改
...
[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

ExecStart=/usr/bin/dockerd --insecure-registry=192.168.2.195   //重要
ExecStartPost=/sbin/iptables -I FORWARD -s 0.0.0.0/0 -j ACCEPT
      //需修改，根据自己的docker路径跟IP地址进行修改
      
ExecReload=/bin/kill -s HUP $MAINPID
TimeoutSec=0
RestartSec=2
Restart=always
...
[Install]
WantedBy=multi-user.target

重启服务：

[root@localhost harbor]# systemctl daemon-reload

[root@localhost harbor]# systemctl restart docker

启动harbor：

 docker-compose up -d ：构建（容器）并启动（容器）整个project的所有service

[root@localhost harbor]# docker-compose up -d
Creating network "harbor_harbor" with the default driver
Creating harbor-log ... done
Creating registry           ... done
Creating redis              ... done
Creating harbor-db          ... done
Creating harbor-adminserver ... done
Creating harbor-ui          ... done
Creating nginx              ... done
Creating harbor-jobservice  ... done

查看服务：

 已经包含了 --insecure-registry=192.168.2.195 参数

[root@localhost harbor]# ps -aux | grep docker
...
root      40719  1.4  4.8 660304 79992 ?        Ssl  01:58   0:14 /usr/bin/dockerd --insecure-registry=192.168.2.195
...

测试登录：

[root@localhost harbor]# docker login 192.168.2.195
Username: admin
Password: 
WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store

Login Succeeded        //登录成功

 成功登录！