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摘要

在无法访问外网的情况下,通过将docker镜像导出为一个包,然后导入到另外的一台计算机上面,从而实现了不用访问外网就能拉取镜像了


1:在离线的环境中导入镜像

在无法访问外网的情况下,通过将docker镜像导出为一个包,然后导入到另外的一台计算机上面,从而实现了不用访问外网就能拉取镜像了

#将镜像输出到这个tar包 [root@cleint ~]# docker save -o centos.tar centos  #通过第三方的工具将这个tar包传输到其他机器上面,然后进行导入 [root@cleint ~]# docker images REPOSITORY   TAG       IMAGE ID   CREATED   SIZE [root@cleint ~]# ls anaconda-ks.cfg  centos.tar  docker-hello  project  qcy-centos [root@cleint ~]# docker load -i centos.tar  Loaded image: centos:latest [root@cleint ~]# docker images REPOSITORY   TAG       IMAGE ID       CREATED       SIZE centos       latest    5d0da3dc9764   2 years ago   231MB  #因此实现了不能访问外网的情况下,拉取镜像了

2:使用dockercommit命令基于容器构建镜像

有一个容器做成了web页面,所有的虚拟机都想要这个web页面的功能,直接基于这个提供web页面的容器做成一个镜像,然后虚拟机直接基于这个web容器镜像构建一个容器,从而提供了web页面

#搭建一个提供web页面的容器 [root@cleint ~]# docker run -tid --name 8080-nginx -p 8080:80 nginx /bin/bash a9161cf2c12713f4ec492b2e9c32aa75d1c8556457db07f33689282adcaf4d9c  #进行访问 [root@cleint ~]# curl http://127.0.0.1:8080 <!DOCTYPE html> <html> <head> <title>Welcome to nginx!</title> <style> html { color-scheme: light dark; } body { width: 35em; margin: 0 auto; font-family: Tahoma, Verdana, Arial, sans-serif; } </style> </head> <body> <h1>Welcome to nginx!</h1> <p>If you see this page, the nginx web server is successfully installed and working. Further configuration is required.</p>  <p>For online documentation and support please refer to <a href="http://nginx.org/">nginx.org</a>.<br/> Commercial support is available at <a href="http://nginx.com/">nginx.com</a>.</p>  <p><em>Thank you for using nginx.</em></p> </body> </html>   #基于这个容器做成一个镜像 [root@cleint ~]# docker commit 8080-nginx  web-nginx sha256:c072b790098d75f0082adb87b0abc0d9757c4db74f1ce9018854cae7ae22dccf [root@cleint ~]# docker images REPOSITORY   TAG       IMAGE ID       CREATED         SIZE web-nginx    latest    c072b790098d   3 seconds ago   187MB nginx        latest    92b11f67642b   6 weeks ago     187MB centos       latest    5d0da3dc9764   2 years ago     231MB  [root@cleint ~]# docker run -tid --name q1 -p 7777:80 web-nginx /bin/bash a66b1611c6cea9276f904f5fb410f632d325066939c72e221906e6607f0ef3b8 [root@cleint ~]# docker ps  CONTAINER ID   IMAGE       COMMAND                  CREATED         STATUS         PORTS                                   NAMES a66b1611c6ce   web-nginx   "/docker-entrypoint.…"   4 seconds ago   Up 3 seconds   0.0.0.0:7777->80/tcp, :::7777->80/tcp   q1 a9161cf2c127   nginx       "/docker-entrypoint.…"   3 minutes ago   Up 3 minutes   0.0.0.0:8080->80/tcp, :::8080->80/tcp   8080-nginx #进入这个容器里面,需要打开这个容器的服务nginx #进行访问 [root@cleint ~]# curl http://127.0.0.1:7777 <!DOCTYPE html> <html> <head> <title>Welcome to nginx!</title> <style> html { color-scheme: light dark; } body { width: 35em; margin: 0 auto; font-family: Tahoma, Verdana, Arial, sans-serif; } </style> </head> <body> <h1>Welcome to nginx!</h1> <p>If you see this page, the nginx web server is successfully installed and working. Further configuration is required.</p>  <p>For online documentation and support please refer to <a href="http://nginx.org/">nginx.org</a>.<br/> Commercial support is available at <a href="http://nginx.com/">nginx.com</a>.</p>  <p><em>Thank you for using nginx.</em></p> </body> </html>  #从而实现了基于这个已有的容器做成一个镜像,然后再来生成一个容器,这个容器会保留之前所做的一些操作  

3:使用第三方容器仓库

使用第三方的仓库,进行上传镜像,下载镜像

这个非常的遍历,就是使用这个仓库的话,因为网络的容器仓库有的属于国外的,所以的话拉取镜像的速度就比较的慢,需要自己的仓库即可

 操作步骤:

#登录第三方的容器仓库 docker login uhub.service.ucloud.cn  username 邮箱 password 密码  #对于要推送的镜像打上标签,只有标签是一致的,才能实现上传 #格式为 uhub.service.ucloud.cn这个 docker tag centos:latest uhub.service.ucloud.cn/admins/centos:latest  #然后拉取镜像,从镜像仓库里面进行拉取 [root@cleint yum.repos.d]# docker pull uhub.service.ucloud.cn/admins/centos:latest latest: Pulling from admins/centos Digest: sha256:a1801b843b1bfaf77c501e7a6d3f709401a1e0c83863037fa3aab063a7fdb9dc Status: Downloaded newer image for uhub.service.ucloud.cn/admins/centos:latest uhub.service.ucloud.cn/admins/centos:latest  #查看容器镜像仓库 可以使用skopeo这个命令进行查看远程的容器仓库

4:使用docker build命令基于dockerfile构建镜像

案例:使用dockerfile来构建一个镜像,然后里面有nginx.repo源,然后进行访问即可

#首先创建一个nginx.repo文件 #创建一个dockerfile文件 [root@cleint dockerfile-test]# ls dockerfile  nginx.repo [root@cleint dockerfile-test]# pwd /root/dockerfile-test [root@cleint dockerfile-test]# cat dockerfile  FROM centos RUN rm -rf /etc/yum.repos.d/*.repo  COPY ./nginx.repo  /etc/yum.repos.d/ RUN  yum clean all && yum makecache RUN yum -y install nginx RUN echo "Hello this is nginx server" > /usr/share/nginx/html/index.html EXPOSE 80 CMD ["nginx","-g","daemon off;"] [root@cleint dockerfile-test]# cat nginx.repo  [nginx] name=nginx baseurl=http://nginx.org/packages/centos/$releasever/$basearch gpgcheck=0 enabled=1  #然后使用dockerfile来创建一个镜像 [root@cleint dockerfile-test]# docker build  -t centos-nginx .  #创建一个容器 [root@cleint dockerfile-test]# docker run -tid --name c1  -p 8080:80 centos-nginx 110106833b9569158312a08a32898da18af450d93ab135c080a23337486c06b1 [root@cleint dockerfile-test]# docker ps -a CONTAINER ID   IMAGE          COMMAND                  CREATED         STATUS        PORTS                                   NAMES 110106833b95   centos-nginx   "nginx -g 'daemon of…"   2 seconds ago   Up 1 second   0.0.0.0:8080->80/tcp, :::8080->80/tcp   c1  #访问 [root@cleint dockerfile-test]# curl 0.0.0.0:8080 Hello this is nginx server

5:当容器内部无法进行上网的操作

yum -y install  autoconf yum -y install gcc wget  http://mirrors.edge.kernel.org/pub/linux/utils/net/bridge-utils/bridge-utils-1.6.tar.gz tar  -xvf bridge-utils-1.6.tar.gz  cd bridge-utils-1.6/ autoconf  ./configure  make make install systemctl stop docker ip link  set dev docker0 down brctl delbr docker0 systemctl restart docker

6:创建一个自定义的桥接网络

网段为192.168.107.0/24 网关为192.168.107.254

[root@cleint dockerfile-test]# docker network create  --driver bridge  --subnet 192.168.107.0/24 --gateway 192.168.107.254 n1 8aec3d57d238b34eb6e0cb31b71775511bddfefebe8f87cb309150909c1fc646 [root@cleint dockerfile-test]# docker network ls NETWORK ID     NAME      DRIVER    SCOPE d1ea2ab3dab8   bridge    bridge    local 5f3fcf22894d   host      host      local 8aec3d57d238   n1        bridge    local b99add30e794   none      null      local [root@cleint dockerfile-test]# docker inspect n1 [     {         "Name": "n1",         "Id": "8aec3d57d238b34eb6e0cb31b71775511bddfefebe8f87cb309150909c1fc646",         "Created": "2024-04-23T20:06:37.31247228+08:00",         "Scope": "local",         "Driver": "bridge",         "EnableIPv6": false,         "IPAM": {             "Driver": "default",             "Options": {},             "Config": [                 {                     "Subnet": "192.168.107.0/24",                     "Gateway": "192.168.107.254"                 }             ]         },         "Internal": false,         "Attachable": false,         "Ingress": false,         "ConfigFrom": {             "Network": ""         },         "ConfigOnly": false,         "Containers": {},         "Options": {},         "Labels": {}     } ] #创建一个容器,连接到这个n1的桥接网卡上面 [root@cleint dockerfile-test]# docker run -tid --name q1 --network n1  centos /bin/bash d098c15e25afd7d39a672f8193a658249016cfecd3e62f309cae4c7a317b94a9 [root@cleint dockerfile-test]# docker ps  CONTAINER ID   IMAGE          COMMAND                  CREATED         STATUS         PORTS                                   NAMES d098c15e25af   centos         "/bin/bash"              3 seconds ago   Up 2 seconds                                           q1 110106833b95   centos-nginx   "nginx -g 'daemon of…"   6 minutes ago   Up 6 minutes   0.0.0.0:8080->80/tcp, :::8080->80/tcp   c1 [root@cleint dockerfile-test]# docker exec -ti q1 /bin/bash [root@d098c15e25af /]# ping www.baidu.com PING www.a.shifen.com (183.2.172.42) 56(84) bytes of data. 64 bytes from 183.2.172.42 (183.2.172.42): icmp_seq=1 ttl=127 time=48.10 ms ^C --- www.a.shifen.com ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 48.952/48.952/48.952/0.000 ms #查看容器的ip信息 [root@cleint dockerfile-test]# docker inspect q1 | grep  -i address             "LinkLocalIPv6Address": "",             "SecondaryIPAddresses": null,             "SecondaryIPv6Addresses": null,             "GlobalIPv6Address": "",             "IPAddress": "",             "MacAddress": "",                     "MacAddress": "02:42:c0:a8:6b:01",                     "IPAddress": "192.168.107.1",                     "GlobalIPv6Address": "", 

 

 

 

 

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