Docker安装初试&&制作centos6.5基础镜像

电玩女神 2022-09-25 07:22 223阅读 0赞

[https://blog.tankywoo.com/docker/2014/05/08/docker-4-summary.html][https_blog.tankywoo.com_docker_2014_05_08_docker-4-summary.html]  
[https://yeasy.gitbooks.io/docker\_practice/content/basic\_concept/container.html][https_yeasy.gitbooks.io_docker_practice_content_basic_concept_container.html]  
**centos7.x系列的yum源中自带了docker的rpm包，安装比较简单**  
`# yum install docker -y`  
安装过程中可能会遇到lvm2包依赖冲突，如不使用，卸载即可  
`# yum remove lvm2`  
启动服务  
`# service docker start`  
查看版本  
`# docker -v Docker version 1.10.3, build d381c64-unsupported`  
获取BusyBox镜像  
`# docker pull busybox`  
创建容器并echo一句话  
`# docker run busybox /bin/echo Starting docker trip? Starting docker trip?`  
**centos6.x系列需要安装epel源，并且升级内核到3.10版本否则docker不能正常运行**  
基于git克隆安装[https://github.com/llitfkitfk/docker-tutorial-cn][https_github.com_llitfkitfk_docker-tutorial-cn]

# git clone git://github.com/llitfkitfk/docker-tutorial-cn.git
    # cd docker-tutorial-cn/
    # ./docker_install.sh 
    ##执行此步骤如果报下文错误需要修改/etc/yum.repos.d/epel.repo文件，取消baseurl的注释，注释掉mirrorlist
    Error: Cannot retrieve metalink for repository: epel. Please verify its path and try again
    # ./docker_config.sh ##可根据实际情况修改docker image的储存路径，此处配置到/mnt/docker，默认路径是/var/lib/docker 
    # mkdir /mnt/docker
    # ./start_docker.sh ##开启docker服务
    docker: relocation error: docker: symbol dm_task_get_info_with_deferred_remove, version Base not defined in file libdevmapper.so.1.02 with link time reference
    # yum upgrade device-mapper-libs ##启动报错，需要安装依赖
    # docker info ##检查Docker是否正确安装
    Containers: 0
    Images: 0
    Storage Driver: devicemapper
     Pool Name: docker-253:0-1182180-pool
     Pool Blocksize: 65.54 kB
     Backing Filesystem: extfs
     Data file: /dev/loop0
     Metadata file: /dev/loop1
     Data Space Used: 305.7 MB
     Data Space Total: 107.4 GB
     Data Space Available: 28.35 GB
     Metadata Space Used: 733.2 kB
     Metadata Space Total: 2.147 GB
     Metadata Space Available: 2.147 GB
     Udev Sync Supported: true
     Deferred Removal Enabled: false
     Data loop file: /var/lib/docker/devicemapper/devicemapper/data
     Metadata loop file: /var/lib/docker/devicemapper/devicemapper/metadata
     Library Version: 1.02.117-RHEL6 (2016-04-01)
    Execution Driver: native-0.2
    Logging Driver: json-file
    Kernel Version: 2.6.32-358.6.2.el6.x86_64
    Operating System: <unknown>
    CPUs: 12
    Total Memory: 3.662 GiB
    Name: localhost
    ID: SAJR:3GXN:LA3H:XV3F:4WUS:PJNS:N7YI:IXS2:LCO2:J6WL:AMCV:AEBW

在docker index中搜索centos相关的image  
`# docker search centos`  
从docker registry server拉取centos镜像  
`# docker pull centos`  
创建一个运行bash应用的容器，一直报错，使用-d命令查看进行运行信息，发现内核版本过低

# docker run -i -t centos /bin/bash
    Error response from daemon: Cannot start container 317bcef4837ad90112a9021012f243bdf92e594h file or directory
    # docker -d
    WARN[0000] You are running linux kernel version 2.6.32-358.6.2.el6.x86_64, which might be pgrade your kernel to 3.10.0.

于是升级内核到3.10  
[http://my.oschina.net/denglz/blog/487332][http_my.oschina.net_denglz_blog_487332]  
安装kernel-lt（long-term）

# yum install http://www.elrepo.org/elrepo-release-6-5.el6.elrepo.noarch.rpm
    # yum --enablerepo=elrepo-kernel install kernel-lt -y

新安装的内核已经自动写入了grub.conf文件，只需修改Grub引导顺序，重启即可  
`# sed -i 's/default=1/default=0/' /etc/grub.conf`

![这里写图片描述][20160817134018152]  
内核已经更新

# uname -a
    Linux localhost.localdomain 3.10.102-1.el6.elrepo.x86_64 #1 SMP Tue Jun 14 11:40:50 EDT 20

列出images

# docker images
    REPOSITORY         TAG                IMAGE ID           CREATED            VIRTUAL SIZE
    centos              latest              d83a55af4e75        2 weeks ago         196.7 MB

使用centos这个镜像创建container进入交互模式，login shell是/bin/bash  
![这里写图片描述][20160818150640453]  
**Docker制作centos6.5基础镜像**  
[http://blog.chinaunix.net/uid-20788636-id-4909654.html][http_blog.chinaunix.net_uid-20788636-id-4909654.html]

# yum install febootstrap
    # mkdir /dockerimg/centos6.5 创建镜像文件保存目录
    # febootstrap -i bash -i wget -i yum -i iputils -i iproute -i man -i vim -i openssh-server -i openssh-clients -i tar -i p7zip -i net-tools centos6.5 /dockerimg/centos6.5 http://vault.centos.org/6.5/os/x86_64/
    -i指定安装的包     centos6.5标识OS版本
    # cp /etc/skel/.bash* /dockerimg/centos6.5/root/
    # cd /dockerimg/centos6.5
    # tar -c .|docker import - centos6.5 导入镜像文件
    63a8a89d802130fa35f0661402bf776069dcfd2cf83da553d4874c6a6c7ad056
    # docker images 已经成功导入，使用docker run命令就可以基于centos6.5创建容器使用了
    REPOSITORY         TAG                IMAGE ID           CREATED             VIRTUAL SIZE
    centos6.5           latest              63a8a89d8021        About a minute ago   372 MB

[https_blog.tankywoo.com_docker_2014_05_08_docker-4-summary.html]: https://blog.tankywoo.com/docker/2014/05/08/docker-4-summary.html
[https_yeasy.gitbooks.io_docker_practice_content_basic_concept_container.html]: https://yeasy.gitbooks.io/docker_practice/content/basic_concept/container.html
[https_github.com_llitfkitfk_docker-tutorial-cn]: https://github.com/llitfkitfk/docker-tutorial-cn
[http_my.oschina.net_denglz_blog_487332]: http://my.oschina.net/denglz/blog/487332
[20160817134018152]: /images/20220718/9671186cb1644245870cc128c1218279.png
[20160818150640453]: /images/20220718/f839198716fa434dba1a70a7589132da.png
[http_blog.chinaunix.net_uid-20788636-id-4909654.html]: http://blog.chinaunix.net/uid-20788636-id-4909654.html