yum安装步骤

yum是Linux系统的安装必备神器，简直不要太方便。但是新系统一般是不自带yum工具的，所以需要手动安装一下。

环境：centos7

1.新建一个目录用来保存yum安装包

mkdir yum

2.进入文件夹并输入命令

wget http://yum.baseurl.org/download/3.2/yum-3.2.28.tar.gz

3.解压

tar -xvf yum-3.2.28.tar.gz

5.进入yum目录

cd yum-3.2.28

6.脚本安装

./yummain.py install yum

PS：脚本安装yum报错 ImportError: No module named sqlitecachec

./yummain.py install yum
Traceback (most recent call last):
  File "./yummain.py", line 27, in <module>
    from yum import Errors
  File "/home/huaxiaolong/yum-3.2.28/yum/__init__.py", line 42, in <module>
    import rpmsack
  File "/home/huaxiaolong/yum-3.2.28/yum/rpmsack.py", line 38, in <module>
    import yum.depsolve
  File "/home/huaxiaolong/yum-3.2.28/yum/depsolve.py", line 30, in <module>
    from transactioninfo import TransactionMember
  File "/home/huaxiaolong/yum-3.2.28/yum/transactioninfo.py", line 31, in <module>
    from sqlitesack import YumAvailablePackageSqlite
  File "/home/huaxiaolong/yum-3.2.28/yum/sqlitesack.py", line 26, in <module>
    import yumRepo
  File "/home/huaxiaolong/yum-3.2.28/yum/yumRepo.py", line 32, in <module>
    import sqlitecachec
ImportError: No module named sqlitecachec

网上说这个sqlitecachec包在:yum-metadata-parser里，但是装了无数次还是没这个包，最后用rpm -ivh http://mirror.centos.org/centos/7/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm --force解决,简而言之就是之前装的第一次没装上 ，然后却提示已经安装上了，最好只能使用–force强制安装安装上。

期间会提示安装新版本，y回车即可

手动更新

# 安装所有更新软件
yum update

安装成功！