使用本地的docker客户端链接远程docker的守护进程

时间  2019-12-05
标签 使用 本地 docker 客户端 链接 远程 守护 进程 栏目 Docker 繁體版
原文   原文链接

概述

在这以前咱们要知道docker是一个c/s架构的程序，也就是说咱们输入的docker命令其实是客户端用来发送指令给docker的守护进程的，全部的操做都是docker的守护进程来作。html

一些基础知识

docker和服务端守护进程通讯有两种方式一个就是docker本身的client(docker cli)还有一个就是用户能够本身写程序，调用docker的remote-api来和docker的守护进程通讯。还有要知道的是docker客户端和服务端是使用socket链接方式的，有三种socket链接方式，一种是直接链接本地的socket文件unix:///var/run/docker/sock，第二种是tcp://host:prot，第三种是fd://socketfd，默认docker都是直接链接本地的socket文件，并且还支持fd://socketfd，若是咱们要支持远程链接就必需要加上tcp链接方式node

使用docker本地客户端链接远程docker服务端

实验环境是 2台centos虚拟机，并且都安装上了docker，为了却别两台机器，我在服务端机器上pull了一个ubuntu镜像 docker pull ubuntu 以后修改服务端配置，让它支持使用tcp远程访问，这里说明一下docker1.12版本以前是修改vim /etc/default/docker的DOCKER_OPTS参数的，可是1.12以后docker建议在/etc/docker/daemon.json文件中修改docker启动参数，具体的全部参数以下面所示linux

{
	"authorization-plugins": [],
	"data-root": "",
	"dns": [],
	"dns-opts": [],
	"dns-search": [],
	"exec-opts": [],
	"exec-root": "",
	"experimental": false,
	"storage-driver": "",
	"storage-opts": [],
	"labels": [],
	"live-restore": true,
	"log-driver": "",
	"log-opts": {},
	"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": {},
	"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"
			]
		}
	}
}

默认docker不建立这个文件，因此咱们要建立而且添加上咱们要的配置，不要的能够不加，好比个人就是docker

{
  "registry-mirrors": ["https://kf0vxqi6.mirror.aliyuncs.com"],
  "labels": ["name=docker-server"],
  "hosts": [
		"tcp://0.0.0.0:2376",
		"unix:///var/run/docker.sock"
	]
}

第一行是仓库地址，第二行是给docker-daemon作一个标签，第三行hosts就是链接方式，如今docker同时支持两种链接方式了 接着咱们直接在客户端centos机器上链接服务端的机器，输入下面命令 docker -H tcp://192.168.0.83:2376 info -H后面就是指定链接的服务端地址 info表示查看服务端daemon的信息json

[root@MiWiFi-R1CM-srv ~]# docker -H tcp://192.168.0.83:2376 info
Containers: 0
 Running: 0
 Paused: 0
 Stopped: 0
Images: 1
Server Version: 18.03.0-ce
Storage Driver: overlay2
 Backing Filesystem: xfs
 Supports d_type: true
 Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
 Volume: local
 Network: bridge host macvlan null overlay
 Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: cfd04396dc68220d1cecbe686a6cc3aa5ce3667c
runc version: 4fc53a81fb7c994640722ac585fa9ca548971871
init version: 949e6fa
Security Options:
 seccomp
  Profile: default
Kernel Version: 3.10.0-693.el7.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64
CPUs: 1
Total Memory: 1.797GiB
Name: MiWiFi-R1CM-srv
ID: 7S6I:U2LJ:C2KG:LVP7:D6WA:46KN:A2HB:XJ7G:6CI3:6ID3:3A5F:B7CZ
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
Labels:
 name=docker-server
Experimental: false
Insecure Registries:
 127.0.0.0/8
Registry Mirrors:
 https://kf0vxqi6.mirror.aliyuncs.com/
Live Restore Enabled: false

若是你不想每次都输入-H参数，那么你能够在客户端机器加上下面的环境变量 export DOCKER_HOST="tcp://192.168.0.83:2376"ubuntu

[root@MiWiFi-R1CM-srv ~]# export DOCKER_HOST="tcp://192.168.0.83:2376"
[root@MiWiFi-R1CM-srv ~]# docker info
Containers: 0
 Running: 0
 Paused: 0
 Stopped: 0
Images: 1
Server Version: 18.03.0-ce
Storage Driver: overlay2
 Backing Filesystem: xfs
 Supports d_type: true
 Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
 Volume: local
 Network: bridge host macvlan null overlay
 Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: cfd04396dc68220d1cecbe686a6cc3aa5ce3667c
runc version: 4fc53a81fb7c994640722ac585fa9ca548971871
init version: 949e6fa
Security Options:
 seccomp
  Profile: default
Kernel Version: 3.10.0-693.el7.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64
CPUs: 1
Total Memory: 1.797GiB
Name: MiWiFi-R1CM-srv
ID: 7S6I:U2LJ:C2KG:LVP7:D6WA:46KN:A2HB:XJ7G:6CI3:6ID3:3A5F:B7CZ
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
Labels:
 name=docker-server
Experimental: false
Insecure Registries:
 127.0.0.0/8
Registry Mirrors:
 https://kf0vxqi6.mirror.aliyuncs.com/
Live Restore Enabled: false

若是你想链接本地那么改回环境变量便可vim

export DOCKER_HOST=""centos

[root@MiWiFi-R1CM-srv ~]# export DOCKER_HOST=""
[root@MiWiFi-R1CM-srv ~]# docker info
Containers: 0
 Running: 0
 Paused: 0
 Stopped: 0
Images: 0
Server Version: 18.03.0-ce
Storage Driver: overlay2
 Backing Filesystem: xfs
 Supports d_type: true
 Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
 Volume: local
 Network: bridge host macvlan null overlay
 Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: cfd04396dc68220d1cecbe686a6cc3aa5ce3667c
runc version: 4fc53a81fb7c994640722ac585fa9ca548971871
init version: 949e6fa
Security Options:
 seccomp
  Profile: default
Kernel Version: 3.10.0-693.el7.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64
CPUs: 1
Total Memory: 1.797GiB
Name: MiWiFi-R1CM-srv
ID: 7S6I:U2LJ:C2KG:LVP7:D6WA:46KN:A2HB:XJ7G:6CI3:6ID3:3A5F:B7CZ
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
Labels:
 name=docker-client-server
Experimental: false
Insecure Registries:
 127.0.0.0/8
Registry Mirrors:
 https://kf0vxqi6.mirror.aliyuncs.com/
Live Restore Enabled: false

最后再说一句，若是你碰到了下面的问题 error during connect: Get http://192.168.0.83:2376/v1.37/info: dial tcp 192.168.0.83:2376: getsockopt: no route to host 那么就是你系统的防火墙开了，你只要修改防火墙规则或者关闭掉防火墙就行了，在centos下是 sudo systemctl stop firewalld 若是你还想查看更多关于链接的问题你能够查看下面这篇博客 远程链接docker daemon，Docker Remote APIapi

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