Linux下的yum怎么升级？
1. 备份默认的yum
# mv /etc/yum.repos.d /etc/yum.repos.d.backup
2. 设置新的yum目录
# mkdir /etc/yum.repos.d && cd /etc/yum.repos.d
3. 下载阿里yum配置到该目录中，用wget，进行下载，
# yum install -y wget
# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
4. 重建缓存
yum clean all执行效果，
[root@ethanyang yum.repos.d]# yum clean all
Loaded plugins: langpacks, product-id, search-disabled-repos, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
Cleaning repos: base centosplus extras updates
Cleaning up everything
yum makecache执行效果，
[root@ethanyang yum.repos.d]# yum makecache
Loaded plugins: langpacks, product-id, search-disabled-repos, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
base | 3.6 kB 00:00:00
centosplus | 2.9 kB 00:00:00
extras | 2.9 kB 00:00:00
updates | 2.9 kB 00:00:00
(1/13): base/x86_64/group_gz | 165 kB 00:00:00
(2/13): base/x86_64/filelists_db | 7.3 MB 00:00:08
(3/13): base/x86_64/primary_db | 6.0 MB 00:00:08
(4/13): base/x86_64/other_db | 2.6 MB 00:00:02
(5/13): centosplus/x86_64/filelists_db | 1.2 MB 00:00:02
(6/13): centosplus/x86_64/other_db | 69 kB 00:00:00
(7/13): centosplus/x86_64/primary_db | 2.7 MB 00:00:03
(8/13): extras/x86_64/filelists_db | 216 kB 00:00:00
(9/13): extras/x86_64/other_db | 106 kB 00:00:00
(10/13): extras/x86_64/primary_db | 164 kB 00:00:01
(11/13): updates/x86_64/filelists_db | 4.0 MB 00:00:03
(12/13): updates/x86_64/other_db | 493 kB 00:00:00
(13/13): updates/x86_64/primary_db | 6.7 MB 00:00:06
Metadata Cache Created
[root@ethanyang yum.repos.d]#
5. 升级所有包
yum update -y
注意：
(1) 第一次运行yum安装软件前，建议更新yum。
(2) yum update -y改变软件设置和系统设置，系统版本内核都升级，需几分钟耐心等待。
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原文链接 https://blog.csdn.net/bisal/article/details/104853055?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522162268744916780255216972%2522%252C%2522scm%2522%253A%252220140713.130102334..%2522%257D&request_id=162268744916780255216972&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~baidu_landing_v2~default-2-104853055.first_rank_v2_pc_rank_v29&utm_term=yum%E7%89%88%E6%9C%AC%E5%8D%87%E7%BA%A7&spm=1018.2226.3001.4187
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