docker安装后默认没有daemon.json这个配置文件，需要进行手动创建。配置文件的默认路径：/etc/docker/daemon.json

一般情况，配置文件 daemon.json中配置的项目参数，在启动参数中同样适用，有些可能不一样（具体可以查看官方文档），但需要注意的一点，配置文件中如果已经有某个配置项，则无法在启动参数中增加，会出现冲突的错误。

我们可以通过此地址https://docs.docker.com/engine/reference/commandline/dockerd/#daemon-configuration-file查看daemon.json文件所有可配参数

{
	"authorization-plugins": [],
	"data-root": "",
	"dns": [],
	"dns-opts": [],
	"dns-search": [],
	"exec-opts": [],
	"exec-root": "",
	"experimental": false,
	"features": {},
	"storage-driver": "",
	"storage-opts": [],
	"labels": [],
	"live-restore": true,
	"log-driver": "json-file",
	"log-opts": {
		"max-size": "10m",
		"max-file":"5",
		"labels": "somelabel",
		"env": "os,customer"
	},
	"mtu": 0,
	"pidfile": "",
	"cluster-store": "",
	"cluster-store-opts": {},
	"cluster-advertise": "",
	"max-concurrent-downloads": 3,
	"max-concurrent-uploads": 5,
	"default-shm-size": "64M",
	"shutdown-timeout": 15,
	"debug": true,
	"hosts": [],
	"log-level": "",
	"tls": true,
	"tlsverify": true,
	"tlscacert": "",
	"tlscert": "",
	"tlskey": "",
	"swarm-default-advertise-addr": "",
	"api-cors-header": "",
	"selinux-enabled": false,
	"userns-remap": "",
	"group": "",
	"cgroup-parent": "",
	"default-ulimits": {
		"nofile": {
			"Name": "nofile",
			"Hard": 64000,
			"Soft": 64000
		}
	},
	"init": false,
	"init-path": "/usr/libexec/docker-init",
	"ipv6": false,
	"iptables": false,
	"ip-forward": false,
	"ip-masq": false,
	"userland-proxy": false,
	"userland-proxy-path": "/usr/libexec/docker-proxy",
	"ip": "0.0.0.0",
	"bridge": "",
	"bip": "",
	"fixed-cidr": "",
	"fixed-cidr-v6": "",
	"default-gateway": "",
	"default-gateway-v6": "",
	"icc": false,
	"raw-logs": false,
	"allow-nondistributable-artifacts": [],
	"registry-mirrors": [],
	"seccomp-profile": "",
	"insecure-registries": [],
	"no-new-privileges": false,
	"default-runtime": "runc",
	"oom-score-adjust": -500,
	"node-generic-resources": ["NVIDIA-GPU=UUID1", "NVIDIA-GPU=UUID2"],
	"runtimes": {
		"cc-runtime": {
			"path": "/usr/bin/cc-runtime"
		},
		"custom": {
			"path": "/usr/local/bin/my-runc-replacement",
			"runtimeArgs": [
				"--debug"
			]
		}
	},
	"default-address-pools":[{"base":"172.80.0.0/16","size":24},
	{"base":"172.90.0.0/16","size":24}]}

1、如何配置 registry 私库相关的参数

涉及以下2个参数：

"insecure-registries": [],  #这个私库的服务地址
"registry-mirrors": [],    #私库加速器

2.配置示例：

# cat /etc/docker/daemon.json
 
{
    "registry-mirrors": [
       "https://d8b3zdiw.mirror.aliyuncs.com"
    ],
 
    "insecure-registries": [
       "https://ower.site.com"
    ]，
}

配置与应用

1.默认没有文件，所以我们需要先创建，进入/etc/docker目录下，记得创建的文件所有者是root（vim或touch，记得chown修改所有者）

-rw-r--r--  1 root root   71 Dec 19 17:25daemon.json

2.在文档中配置想要添加的参数：如，镜像加速器网站,私库网站

# cat /etc/docker/daemon.json
{
   "registry-mirrors":[
        "https://d8b3zdiw.mirror.aliyuncs.com"
    ],
 
    "insecure-registries": [
       "https://ower.site.com"
    ]，
}

3.创建并修改完daemon.json文件后，需要让这个文件生效

a.修改完成后reload配置文件

sudo systemctl daemon-reload

b.重启docker服务

sudo systemctl restart docker.service

c.查看状态

sudo systemctl status docker -l

d.查看服务

sudo docker info