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運氣好時非常順利，一個 rpm 包，一執行安裝，就完成了，比如今天在單位的虛擬機器上。運氣沒那麼好的時候，要手動安裝一些信賴，比如下班回家後的我。感謝運氣不那麼好，要不然就不會整理這篇文件了。

安裝包集合：https://download.docker.com/linux/centos/7/x86_64/stable/Packages/

此次安裝用到了列表中的：

• containerd.io-1.2.5-3.1.el7.x86_64.rpm
• docker-ce-cli-18.09.4-3.el7.x86_64.rpm
• docker-ce-18.09.4-3.el7.x86_64.rpm

白天虛擬機器上，竟然只安裝 docker-ce-18.09.4-3.el7.x86_64.rpm 就可以了，結果晚上雲伺服器上陸續出現下面的問題

1. 嘗試直接安裝 docker-ce-18.09.4-3.el7.x86_64.rpm

    [root@iZ286t0wuf9Z ftp_user]# yum install ./docker-ce-18.09.4-3.el7.x86_64.rpm
    Loaded plugins: fastestmirror
    Examining ./docker-ce-18.09.4-3.el7.x86_64.rpm: 3:docker-ce-18.09.4-3.el7.x86_64
    Marking ./docker-ce-18.09.4-3.el7.x86_64.rpm to be installed
    **************此處省略一大堆輸出**************
    --> Finished Dependency Resolution
    Error: Package: 3:docker-ce-18.09.4-3.el7.x86_64 (/docker-ce-18.09.4-3.el7.x86_64)
               Requires: docker-ce-cli
    Error: Package: 3:docker-ce-18.09.4-3.el7.x86_64 (/docker-ce-18.09.4-3.el7.x86_64)
               Requires: containerd.io >= 1.2.2-3
     You could try using --skip-broken to work around the problem
    ** Found 2 pre-existing rpmdb problem(s), 'yum check' output follows:
    2:postfix-2.10.1-6.el7.x86_64 has missing requires of libmysqlclient.so.18()(64bit)
    2:postfix-2.10.1-6.el7.x86_64 has missing requires of libmysqlclient.so.18(libmysqlclient_18)(64bit)
    [root@iZ286t0wuf9Z ftp_user]#
    
   

2. 根據提示，“Requires: docker-ce-cli” 和 “Requires: containerd.io >= 1.2.2-3”，所以安裝了前面提到的另外兩個 rpm 檔案。

    [root@iZ286t0wuf9Z ftp_user]# yum install containerd.io-1.2.5-3.1.el7.x86_64.rpm 
    **************此處省略一大堆輸出**************
    [root@iZ286t0wuf9Z ftp_user]# yum install docker-ce-cli-18.09.4-3.el7.x86_64.rpm 
    **************此處省略一大堆輸出**************
    [root@iZ286t0wuf9Z ftp_user]# 
    
   

3. 再嘗試安裝 docker-ce-18.09.4-3.el7.x86_64.rpm

    [root@iZ286t0wuf9Z ftp_user]# yum install ./docker-ce-18.09.4-3.el7.x86_64.rpm 
    Loaded plugins: fastestmirror
    Examining ./docker-ce-18.09.4-3.el7.x86_64.rpm: 3:docker-ce-18.09.4-3.el7.x86_64
    Marking ./docker-ce-18.09.4-3.el7.x86_64.rpm to be installed
    Resolving Dependencies
    **************此處省略一大堆輸出**************
    Downloading packages:
    Delta RPMs disabled because /usr/bin/applydeltarpm not installed.
   
   
    Error downloading packages:
      selinux-policy-targeted-3.13.1-229.el7_6.9.noarch: [Errno 5] [Errno 12] Cannot allocate memory
    **************此處省略一大堆輸出**************
      libsepol-devel-2.5-10.el7.x86_64: [Errno 5] [Errno 12] Cannot allocate memory
   

4. 根據提示 “because /usr/bin/applydeltarpm not installed”，所以如下操作

    [root@iZ286t0wuf9Z ftp_user]# yum provides '*/applydeltarpm' 
    Loaded plugins: fastestmirror
    Loading mirror speeds from cached hostfile
    base/7/x86_64/filelists_db
    | 7.1 MB  00:00:00     
    epel/x86_64/filelists_db
    |  11 MB  00:00:00     
    extras/7/x86_64/filelists_db
    | 236 kB  00:00:00     
    updates/7/x86_64/filelists_db
    | 2.7 MB  00:00:00     
    deltarpm-3.6-3.el7.x86_64 : Create deltas between rpms
    Repo        : base
    Matched from:
    Filename    : /usr/bin/applydeltarpm
   

   原來是 deltarpm-3.6-3.el7.x86_64 的問題，所以繼續操作

    [root@iZ286t0wuf9Z ftp_user]# yum install deltarpm
    Loaded plugins: fastestmirror
    Loading mirror speeds from cached hostfile
    Resolving Dependencies
    --> Running transaction check
    ---> Package deltarpm.x86_64 0:3.6-3.el7 will be installed
    --> Finished Dependency Resolution
    **************此處省略一大堆輸出**************                                                                                                                                                                    
    Complete!
   

5. 最後一次嘗試安裝 docker-ce-18.09.4-3.el7.x86_64.rpm

    [root@iZ286t0wuf9Z ftp_user]# yum install docker-ce-18.09.4-3.el7.x86_64.rpm 
    Loaded plugins: fastestmirror
    Examining docker-ce-18.09.4-3.el7.x86_64.rpm: 3:docker-ce-18.09.4-3.el7.x86_64
    Marking docker-ce-18.09.4-3.el7.x86_64.rpm to be installed
    Resolving Dependencies
    **************此處省略一大堆輸出**************
    Complete!
    [root@iZ286t0wuf9Z ftp_user]# 
   

愉快完成

參考：

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