如何处理‘`yum repolist is 0’和‘`yum list空’？

Question

我在centos 7主机上运行了一个码头映像(gitlab-runner)。在容器中，奇怪的是它有apt命令，但是没有yum command.But系统似乎是一个中心而不是ubuntu？

root@vultr:/usr/local/java# uname -r 
3.10.0-1062.4.1.el7.x86_64

我用apt-get install来安装yum，然后我想做yum更新，但是我遇到了以下问题，如何处理？

    root@vultr:/usr/local/java# yum update      
    There are no enabled repos.
    Run "yum repolist all" to see the repos you have.
    You can enable repos with yum-config-manager --enable <repo>
    root@vultr:/usr/local/java# yum repolist all
    repolist: 0
    root@vultr:/usr/local/java# yum list
    root@vultr:/usr/local/java#
    root@vultr:/usr/local/java#
    root@vultr:/usr/local/java# yum-config-manager --enable
    Error: Trying to enable already enabled repos.
    ==================================================================================================== main ====================================================================================================
    [main]
    alwaysprompt = True
    assumeyes = False
    bandwidth = 0
    bugtracker_url = http://yum.baseurl.org/report
    cache = 0
    cachedir = /var/cache/yum
    clean_requirements_on_remove = False
    color = auto
    color_list_available_downgrade = dim,cyan
    color_list_available_install = normal
    color_list_available_reinstall = bold,underline,green
    color_list_available_upgrade = bold,blue
    color_list_installed_extra = bold,red
    color_list_installed_newer = bold,yellow
    color_list_installed_older = bold
    color_list_installed_reinstall = normal
    color_search_match = bold
    color_update_installed = normal
    color_update_local = bold
    color_update_remote = normal
    commands =
    debuglevel = 2
    diskspacecheck = True
    distroverpkg = redhat-release
    enable_group_conditionals = True
    enabled = True
    enablegroups = True
    errorlevel = 2
    exactarch = True
    exactarchlist = kernel,
       kernel-smp,
       kernel-hugemem,
       kernel-enterprise,
       kernel-bigmem,
       kernel-devel,
       kernel-PAE,
       kernel-PAE-debug
    exclude =
    exit_on_lock = False
    failovermethod = roundrobin
    gaftonmode = False
    gpgcheck = False
    group_package_types = mandatory,
       default
    groupremove_leaf_only = False
    history_list_view = single-user-commands

Answer 1

GitLab运行程序映像是基于Ubuntu或Alpine的。这是在医生里声明的：

可获得下列Docker图像：

• 基于Ubuntu的gitlab/gitlab-runner:latest。
• gitlab/gitlab-runner:alpine基于阿尔卑斯山，占地面积小得多(~160/350MB Ubuntu ~45/130MB阿尔卑斯压缩/解压)。

Ubuntu和Alpine都有自己的包管理系统-- apt和apk。可以使用这些包管理器在容器中添加/删除包。yum是RHEL/Fedora类Linux发行版的包管理器，Ubuntu或Alpine都不使用它。