一、docker push 提示：x509: certificate signed by unknown authority

1、打开daemon.json，在insecure-registries里面添加你的私库地址

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vim /etc/docker/daemon.json
{
   "registry-mirrors":["https://xxx.aliyuncs.com"],  #镜像加速地址
   "log-driver": "json-file",
    "log-opts": {
    "max-size": "100m",
    "max-file": "3"
    },
    "max-concurrent-downloads": 10,
    "max-concurrent-uploads": 10,
    "data-root": "/var/lib/docker",
    "storage-driver": "overlay2",
    "storage-opts": [
      "overlay2.override_kernel_check=true"
    ],
    "insecure-registries":["192.168.2.xxx:443"]
}
# 部分参数（registry-mirrors、insecure-registries ...）修改，只要reconfigure(systemctl reload docker) 就生效。insecure-registries 修改需要重启docker。

2、重启Docker

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systemctl restart docker

这样就可以了。先docker login，然后再docker push。