yum downloadonly

當生產環境因爲安全緣由處於斷網狀態的時候。經過本地源的方式，使用yum可以自動安裝軟件，而且自動處理好依賴關係。
然而該方法最最關鍵的一個問題是——怎麼獲取該軟件及其依賴包，供本地源使用？
若是真的以爲很無力，那麼downloadonly跟yumdownload絕對是兩個值得嘗試的神器。本文主要介紹downloadonly的使用方法。

yum install yum-plugin-downloadonly
centos7默認yum就有downloadonly
[root@linux-node1 ~]# yum install yum-plugin-downloadonly
Loaded plugins: fastestmirror, langpacks
Repository base is listed more than once in the configuration
Repository updates is listed more than once in the configuration
Repository extras is listed more than once in the configuration
Repository centosplus is listed more than once in the configuration
Loading mirror speeds from cached hostfile

• base: mirrors.cn99.com
• epel: mirrors.tongji.edu.cn
• extras: mirrors.aliyun.com
• updates: mirrors.cn99.com
  Package yum-3.4.3-158.el7.centos.noarch already installed and latest version
  Nothing to do
  [root@linux-node1 ~]#
  
  
  

建立目錄用來緩存rpm包
[root@linux-node1 ~]# mkdir /data/rpm -p
[root@linux-node1 ~]#

咱們還能夠指定軟件包的下載路徑。須要加入參數–downloaddir參數。
格式：yum install –downloadonly –downloaddir= your-dir package-name，如：

執行依賴包下載
[root@linux-node1 /data/rpms]# yum install --downloadonly --downloaddir=/data/rpm gem
[root@linux-node1 ~]# cd /data/rpm/
[root@linux-node1 /data/rpm]# ll
total 1012
-rw-r--r-- 1 root root 72560 Mar 5 21:47 ruby-2.0.0.648-33.el7_4.x86_64.rpm
-rw-r--r-- 1 root root 84692 Mar 5 21:47 rubygem-bigdecimal-1.2.0-33.el7_4.x86_64.rpm
-rw-r--r-- 1 root root 55044 Mar 5 21:47 rubygem-io-console-0.4.2-33.el7_4.x86_64.rpm
-rw-r--r-- 1 root root 81180 Mar 5 21:47 rubygem-json-1.7.7-33.el7_4.x86_64.rpm
-rw-r--r-- 1 root root 84160 Mar 5 21:48 rubygem-psych-2.0.0-33.el7_4.x86_64.rpm
-rw-r--r-- 1 root root 329272 Mar 5 21:48 rubygem-rdoc-4.0.0-33.el7_4.noarch.rpm
-rw-r--r-- 1 root root 224400 Mar 5 21:48 rubygems-2.0.14.1-33.el7_4.noarch.rpm
-rw-r--r-- 1 root root 94056 Mar 5 21:48 ruby-irb-2.0.0.648-33.el7_4.noarch.rpm
[root@linux-node1 /data/rpms]#

離線安裝本地rpm包，這樣rpm包就能夠拿到一個沒法連外網的環境使用

[root@linux-node1 /data]# cd rpm/
[root@linux-node1 /data/rpm]# ll
total 3932
-rw-r--r-- 1 root root 56068 Jan 30 2015 libyaml-0.1.4-11.el7_0.x86_64.rpm
-rw-r--r-- 1 root root 72560 Mar 5 21:47 ruby-2.0.0.648-33.el7_4.x86_64.rpm
-rw-r--r-- 1 root root 84692 Mar 5 21:47 rubygem-bigdecimal-1.2.0-33.el7_4.x86_64.rpm
-rw-r--r-- 1 root root 55044 Mar 5 21:47 rubygem-io-console-0.4.2-33.el7_4.x86_64.rpm
-rw-r--r-- 1 root root 81180 Mar 5 21:47 rubygem-json-1.7.7-33.el7_4.x86_64.rpm
-rw-r--r-- 1 root root 84160 Mar 5 21:48 rubygem-psych-2.0.0-33.el7_4.x86_64.rpm
-rw-r--r-- 1 root root 329272 Mar 5 21:48 rubygem-rdoc-4.0.0-33.el7_4.noarch.rpm
-rw-r--r-- 1 root root 224400 Mar 5 21:48 rubygems-2.0.14.1-33.el7_4.noarch.rpm
-rw-r--r-- 1 root root 94056 Mar 5 21:48 ruby-irb-2.0.0.648-33.el7_4.noarch.rpm
-rw-r--r-- 1 root root 2931216 Mar 5 21:48 ruby-libs-2.0.0.648-33.el7_4.x86_64.rpm
[root@linux-node1 /data/rpm]#* yum localinstall .rpm -y**