yum和rpm
最常用的几个命令：
- install：安装
- update：更新
- remove：删除
- search：搜索
- localinstall：安装本地rpm包
下面演示一下安装nginx：
搜索
# yum search nginx
collectd-nginx.x86_64 : Nginx plugin for collectd
munin-nginx.noarch : NGINX support for Munin resource monitoring
nextcloud-nginx.noarch : Nginx integration for NextCloud
nginx-all-modules.noarch : A meta package that installs all available Nginx modules
nginx-filesystem.noarch : The basic directory layout for the Nginx server
nginx-mod-http-geoip.x86_64 : Nginx HTTP geoip module
nginx-mod-http-image-filter.x86_64 : Nginx HTTP image filter module
nginx-mod-http-perl.x86_64 : Nginx HTTP perl module
nginx-mod-http-xslt-filter.x86_64 : Nginx XSLT module
nginx-mod-mail.x86_64 : Nginx mail modules
nginx-mod-stream.x86_64 : Nginx stream modules
owncloud-nginx.noarch : Nginx integration for ownCloud
pcp-pmda-nginx.x86_64 : Performance Co-Pilot (PCP) metrics for the Nginx Webserver
python2-certbot-nginx.noarch : The nginx plugin for certbot
nginx.x86_64 : A high performance web server and reverse proxy server
Name and summary matches only, use "search all" for everything.
搜出来好多，仔细看一下最后一个才是，但是上面也没有显示nginx的版本，如果我们要安装具体的某一个版本怎么办？
先查看源里面nginx的版本：
# yum info nginx.x86_64
Available Packages
Name : nginx
Arch : x86_64
Epoch : 1
Version : 1.12.2
Release : 3.el7
Size : 531 k
Repo : epel/x86_64
Summary : A high performance web server and reverse proxy server
URL : http://nginx.org/
License : BSD
Description : Nginx is a web server and a reverse proxy server for HTTP, SMTP, POP3 and
: IMAP protocols, with a strong focus on high concurrency, performance and low
: memory usage.
如果要安装其他版本的，就需要添加源了：
vim /etc/yum.repos.d/nginx.repo
删除
yum remove nginx
yum erase nginx
查看某个名字在哪个包里面
yum provides nginx
yum配置http代理
在/etc/yum.conf后面添加以下内容：
proxy=http://代理服务器IP地址:端口号
如果需要认证:
proxy=http://代理服务器IP地址:端口号
proxy_username=代理服务器用户名
proxy_password=代理服务器密码