执行yum 命令时 提示yum命令找不到
[root@nfs ~]# yum install -y inotify-tools
-bash: yum: command not found
一、打开清华大学镜像 站https://mirrors.tuna.tsinghua.edu.cn（或其他）
进入路径：https://mirrors.tuna.tsinghua.edu.cn/centos/7/os/x86_64/Packages/
注意：找到对应自己centos系统的版本
找到以下rpm软件包：
python-iniparse-0.4-9.el7.noarch.rpm
yum-3.4.3-163.el7.centos.noarch.rpm
yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
yum-plugin-fastestmirror-1.1.31-52.el7.noarch.rpm
二、安装rpm包
[root@nfs ~]# rpm -ivh python*
warning: package python-iniparse-0.4-9.el7.noarch was already added, skipping python-iniparse-0.4-9.el7.noarch
Preparing... ################################# [100%]
package python-iniparse-0.4-9.el7.noarch is already installed
[root@nfs ~]# rpm -ivh yum*
warning: package yum-metadata-parser-1.1.4-10.el7.x86_64 was already added, skipping yum-metadata-parser-1.1.4-10.el7.x86_64
Preparing... ################################# [100%]
Updating / installing...
1:yum-metadata-parser-1.1.4-10.el7 ################################# [ 33%]
2:yum-plugin-fastestmirror-1.1.31-5################################# [ 67%]
3:yum-3.4.3-163.el7.centos ################################# [100%]
三、yum源优化
root@nfs ~]# cd /etc/yum.repos.d/
[root@nfs yum.repos.d]# ls
CentOS-Base.repo CentOS-CR.repo CentOS-fasttrack.repo CentOS-Sources.repo epel.repo
CentOS-Base.repo.bak CentOS-Debuginfo.repo CentOS-Media.repo CentOS-Vault.repo
[root@nfs yum.repos.d]# rm -rf*
[root@nfs yum.repos.d]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
--2020-01-14 16:22:43-- http://mirrors.aliyun.com/repo/Centos-7.repo
Resolving mirrors.aliyun.com (mirrors.aliyun.com)... 111.32.173.225, 111.32.172.238, 111.32.172.240, ...
Connecting to mirrors.aliyun.com (mirrors.aliyun.com)|111.32.173.225|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 2523 (2.5K) [application/octet-stream]
Saving to: ‘/etc/yum.repos.d/CentOS-Base.repo’
100%[=====================================================================>] 2,523 --.-K/s in 0s
2020-01-14 16:22:43 (156 MB/s) - ‘/etc/yum.repos.d/CentOS-Base.repo’ saved [2523/2523]
[root@nfs yum.repos.d]# wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
--2020-01-14 16:25:18-- http://mirrors.aliyun.com/repo/epel-7.repo
Resolving mirrors.aliyun.com (mirrors.aliyun.com)... 111.32.173.233, 183.201.230.245, 111.32.172.240, ...
Connecting to mirrors.aliyun.com (mirrors.aliyun.com)|111.32.173.233|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 664 [application/octet-stream]
Saving to: ‘/etc/yum.repos.d/epel.repo’
100%[=====================================================================>] 664 --.-K/s in 0s
2020-01-14 16:25:23 (37.0 MB/s) - ‘/etc/yum.repos.d/epel.repo’ saved [664/664]
[root@nfs yum.repos.d]# ls
CentOS-Base.repo epel.repo
四、执行下载测试
[root@nfs yum.repos.d]# yum install -y rsync
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
epel | 5.3 kB 00:00:00
(1/3): epel/x86_64/group_gz | 90 kB 00:00:00
^C/3): epel/x86_64/updateinfo 17% [===== ] 321 kB/s | 1.4 MB 00:00:21 ETA
Exiting on user cancel
[root@nfs yum.repos.d]# yum install -y cowsay
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
epel/x86_64/primary_db | 6.9 MB 00:00:11
Resolving Dependencies
--> Running transaction check
---> Package cowsay.noarch 0:3.04-4.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
===============================================================================================================
Package Arch Version Repository Size
===============================================================================================================
Installing:
cowsay noarch 3.04-4.el7 epel 42 k
Transaction Summary
===============================================================================================================
Install 1 Package
Total download size: 42 k
Installed size: 77 k
Downloading packages:
cowsay-3.04-4.el7.noarch.rpm | 42 kB 00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Warning: RPMDB altered outside of yum.
Installing : cowsay-3.04-4.el7.noarch 1/1
Verifying : cowsay-3.04-4.el7.noarch 1/1
Installed:
cowsay.noarch 0:3.04-4.el7
Complete!
