【docker】docker desktop换国内源时 apply按钮为灰色or换源失败 解决方法

配docker环境时复制进去国内镜像源后，发现apply按钮为灰色，点不了，如下图

解决方法：

往下滑，找到下图圈住的选项打勾

再回到Docker Engine界面，发现可以点apply按钮了

直接把下面的全选覆盖掉原来的（两个任选其一即可）

{
  "builder": {
    "gc": {
      "defaultKeepStorage": "20GB",
      "enabled": true
    }
  },
  "experimental": false,
  "registry-mirrors": [
    "http://mirrors.ustc.edu.cn",
    "http://hub-mirror.c.163.com",
    "https://docker.hpcloud.cloud",
    "https://docker.m.daocloud.io",
    "https://docker.unsee.tech",
    "https://docker.1panel.live",
    "https://docker.chenby.cn",
    "http://mirror.azure.cn",
    "https://dockerpull.org",
    "https://dockerhub.icu",
    "https://hub.rat.dev"
  ]
}

或者

{
  "builder": {
    "gc": {
      "defaultKeepStorage": "20GB",
      "enabled": true
    }
  },
  "experimental": false,
  "registry-mirrors": [
    "https://docker.1ms.run",
    "https://hub-mirror.c.163.com",
    "https://mirror.baidubce.com",
    "https://mirror.ccs.tencentyun.com",
    "https://dockerproxy.com",
    "https://docker.mirrors.sjtug.sjtu.edu.cn",
    "https://docker.nju.edu.cn",
    "https://mirror.azure.cn",
    "https://docker.1panel.dev",
    "https://docker.foreverlink.love",
    "https://dytt.online",
    "https://func.ink",
    "https://lispy.org",
    "https://docker.xiaogenban1993.com",
    "https://docker.xn--6oq72ry9d5zx.cn",
    "https://docker.zhai.cm",
    "https://docker.5z5f.com",
    "https://a.ussh.net",
    "https://docker.cloudlayer.icu",
    "https://docker.linkedbus.com",
    "https://hub.littlediary.cn",
    "https://hub.crdz.gq",
    "https://docker.unsee.tech",
    "https://docker.kejilion.pro",
    "https://registry.dockermirror.com",
    "https://hub.rat.dev",
    "https://dhub.kubesre.xyz",
    "https://docker.nastool.de",
    "https://docker.udayun.com",
    "https://docker.rainbond.cc",
    "https://hub.geekery.cn",
    "https://docker.1panelproxy.com",
    "https://docker.m.daocloud.io"
  ]
}

读者也可以添加其他源。效果如下

点击apply即可