在這以前咱們要知道docker是一個c/s架構的程序,也就是說咱們輸入的docker命令其實是客戶端用來發送指令給docker的守護進程的,全部的操做都是docker的守護進程來作。html
docker和服務端守護進程通訊有兩種方式一個就是docker本身的client(docker cli)還有一個就是用戶能夠本身寫程序,調用docker的remote-api來和docker的守護進程通訊。還有要知道的是docker客戶端和服務端是使用socket鏈接方式的,有三種socket鏈接方式,一種是直接鏈接本地的socket文件unix:///var/run/docker/sock
,第二種是tcp://host:prot
,第三種是fd://socketfd
,默認docker都是直接鏈接本地的socket文件,並且還支持fd://socketfd
,若是咱們要支持遠程鏈接就必需要加上tcp鏈接方式node
實驗環境是 2臺centos虛擬機,並且都安裝上了docker,爲了卻別兩臺機器,我在服務端機器上pull了一個ubuntu鏡像 docker pull ubuntu
以後修改服務端配置,讓它支持使用tcp遠程訪問,這裏說明一下docker1.12版本以前是修改vim /etc/default/docker
的DOCKER_OPTS參數的,可是1.12以後docker建議在/etc/docker/daemon.json
文件中修改docker啓動參數,具體的全部參數以下面所示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" ] } } }
默認docker不建立這個文件,因此咱們要建立而且添加上咱們要的配置,不要的能夠不加,好比個人就是docker
{ "registry-mirrors": ["https://kf0vxqi6.mirror.aliyuncs.com"], "labels": ["name=docker-server"], "hosts": [ "tcp://0.0.0.0:2376", "unix:///var/run/docker.sock" ] }
第一行是倉庫地址,第二行是給docker-daemon作一個標籤,第三行hosts就是鏈接方式,如今docker同時支持兩種鏈接方式了 接着咱們直接在客戶端centos機器上鍊接服務端的機器,輸入下面命令 docker -H tcp://192.168.0.83:2376 info
-H後面就是指定鏈接的服務端地址 info表示查看服務端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
若是你不想每次都輸入-H參數,那麼你能夠在客戶端機器加上下面的環境變量 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
若是你想鏈接本地那麼改回環境變量便可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
最後再說一句,若是你碰到了下面的問題 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
那麼就是你係統的防火牆開了,你只要修改防火牆規則或者關閉掉防火牆就行了,在centos下是 sudo systemctl stop firewalld
若是你還想查看更多關於鏈接的問題你能夠查看下面這篇博客 遠程鏈接docker daemon,Docker Remote APIapi
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