Centos環境docker的正確安裝及疑難雜癥
阿新 • • 發佈：2018-06-20
文檔 出現 連接 targe daemon digest working bcg for
根據官方文檔：https://docs.docker.com/install/linux/docker-ce/centos/搭建docker
1.卸載docker舊版本：
sudo yum remove docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate docker-logrotate docker-selinux docker-engine-selinux docker-engine\
2.安裝相關工具類：
sudo yum install -y yum-utils device-mapper-persistent-data lvm2
3.配置docker倉庫：
sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
會報以下錯誤： Loaded plugins: fastestmirror adding repo from: https://download.docker.com/linux/centos/docker-ce.repo grabbing file https://download.docker.com/linux/centos/docker-ce.repo to /etc/yum.repos.d/docker-ce.repo Could not fetch/save url https://download.docker.com/linux/centos/docker-ce.repo to file /etc/yum.repos.d/docker-ce.repo: [Errno 14] curl#35 - "TCP connection reset by peer
這是由於國內訪問不到docker官方鏡像的緣故
可以通過aliyun的源來完成：
sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
出現以下內容則表示docker倉庫配置成功： Loaded plugins: fastestmirror adding repo from: http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo grabbing file http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo to /etc/yum.repos.d/docker-ce.repo repo saved to /etc/yum.repos.d/docker-ce.repo
4.安裝docker
sudo yum install docker-ce
出現以下異常： Loaded plugins: fastestmirror base https://download-stage.docker.com/linux/centos/7/x86_64/stable/repodata/repomd.xml: [Errno 14] curl#35 - "TCP connection reset by peer" Trying other mirror. One of the configured repositories failed (Docker CE Stable - x86_64), and yum doesn‘t have enough cached data to continue. At this point the only safe thing yum can do is fail. There are a few ways to work "fix" this: 1. Contact the upstream for the repository and get them to fix the problem. 2. Reconfigure the baseurl/etc. for the repository, to point to a working upstream. This is most often useful if you are using a newer distribution release than is supported by the repository (and the packages for the previous distribution release still work). 3. Run the command with the repository temporarily disabled yum --disablerepo=docker-ce-stable ... 4. Disable the repository permanently, so yum won‘t use it by default. Yum will then just ignore the repository until you permanently enable it again or use --enablerepo for temporary usage: yum-config-manager --disable docker-ce-stable or subscription-manager repos --disable=docker-ce-stable 5. Configure the failing repository to be skipped, if it is unavailable. Note that yum will try to contact the repo. when it runs most commands, so will have to try and fail each time (and thus. yum will be be much slower). If it is a very temporary problem though, this is often a nice compromise: yum-config-manager --save --setopt=docker-ce-stable.skip_if_unavailable=true failure: repodata/repomd.xml from docker-ce-stable: [Errno 256] No more mirrors to try. https://download-stage.docker.com/linux/centos/7/x86_64/stable/repodata/repomd.xml: [Errno 14] curl#35 - "TCP connection reset by peer"
分析原因為：阿裏的鏡像庫文件也指向docker官方庫，所以需要修改庫文件
sudo vim /etc/yum.repos.d/docker-ce.repo
通過命令把https://download-stage.docker.com替換為http://mirrors.aliyun.com/docker-ce
命令如下：:%s#https://download-stage.docker.com#http://mirrors.aliyun.com/docker-ce#g
再執行docker的安裝命令即可安裝成功。
sudo yum install docker-ce
內容如下：
Installed: docker-ce.x86_64 0:18.03.0.ce-1.el7.centos Dependency Installed: audit-libs-python.x86_64 0:2.7.6-3.el7 checkpolicy.x86_64 0:2.5-4.el7 container-selinux.noarch 2:2.42-1.gitad8f0f7.el7 libcgroup.x86_64 0 libtool-ltdl.x86_64 0:2.4.2-22.el7_3 pigz.x86_64 0:2.3.3-1.el7.centos policycoreutils-python.x86_64 0:2.5-17.1.el7 python-IPy.noarch Complete!
5.驗證docker安裝成功：
啟動docker：
sudo systemctl start docker
驗證docker:
sudo docker run hello-world
則會出現以下異常：
Unable to find image ‘hello-world:latest‘ locally latest: Pulling from library/hello-world 9bb5a5d4561a: Pulling fs layer docker: error pulling image configuration: Get https://dseasb33srnrn.cloudfront.net/registry-v2/docker/registry/v2/blobs/sha256/e3/e38bc07ac18e See ‘docker run --help‘.
此錯誤也是網絡問題：出現這個問題原因為國內網絡問題，無法連接到 docker hub。
配置阿裏雲的docker鏡像庫：在阿裏雲開通容器鏡像服務拿到加速地址在執行以下命令：
也可以：
好在國內已經有 daocloud，docker指定該源即可。
vi /usr/lib/systemd/system/docker.service [Unit] Description=Docker Application Container Engine Documentation=https://docs.docker.com After=network-online.target firewalld.service Wants=network-online.target [Service] Type=notify # the default is not to use systemd for cgroups because the delegate issues still # exists and systemd currently does not support the cgroup feature set required # for containers run by docker ExecStart=/usr/bin/dockerd --registry-mirror=http://f2d6cb40.m.daocloud.io ExecReload=/bin/kill -s HUP $MAINPID # Having non-zero Limit*s causes performance problems due to accounting overhead # in the kernel. We recommend using cgroups to do container-local accounting. LimitNOFILE=infinity LimitNPROC=infinity LimitCORE=infinity # Uncomment TasksMax if your systemd version supports it. # Only systemd 226 and above support this version. #TasksMax=infinity TimeoutStartSec=0 # set delegate yes so that systemd does not reset the cgroups of docker containers Delegate=yes # kill only the docker process, not all processes in the cgroup KillMode=process # restart the docker process if it exits prematurely Restart=on-failure StartLimitBurst=3 StartLimitInterval=60s [Install] WantedBy=multi-user.target
重啟docker服務：
$ sudo systemctl daemon-reload $ sudo systemctl restart docker
再次驗證docker:
sudo docker run hello-world
出現一下內容表示驗證成功：
Unable to find image ‘hello-world:latest‘ locally latest: Pulling from library/hello-world 9bb5a5d4561a: Pull complete Digest: sha256:f5233545e43561214ca4891fd1157e1c3c563316ed8e237750d59bde73361e77 Status: Downloaded newer image for hello-world:latest Hello from Docker! This message shows that your installation appears to be working correctly. To generate this message, Docker took the following steps: 1. The Docker client contacted the Docker daemon. 2. The Docker daemon pulled the "hello-world" image from the Docker Hub. (amd64) 3. The Docker daemon created a new container from that image which runs the executable that produces the output you are currently reading. 4. The Docker daemon streamed that output to the Docker client, which sent it to your terminal. To try something more ambitious, you can run an Ubuntu container with: $ docker run -it ubuntu bash Share images, automate workflows, and more with a free Docker ID: https://hub.docker.com/ For more examples and ideas, visit: https://docs.docker.com/engine/userguide/
Centos環境docker的正確安裝及疑難雜癥