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Centos小白学习
以前用ubuntu比较多，但服务器要求，决定开始学习Centos
1.安装完Centos后桌面宽度不能自适应
如果使用的是 gnome, 点击菜单 "System -> Preferences -> Display，调整分辨率
2.Centos安装FireFox，原装的反应很慢
解压
# cd /usr/local
# su -c "tar zxvf /home/wandering/firefox-2.0.0.5.tar.gz"
替换
# which firefox
/usr/bin/firefox
# mv /usr/bin/firefox /usr/bin/firefox-1.5.0.9
# ln -s /usr/local/firefox/firefox /usr/bin/firefox
命令行下：firefox
小知识：
.tar.gz 格式解压为 tar -zxvf xx.tar.gz
.tar.bz2 格式解压为 tar -jxvf xx.tar.bz2
3.yum更新源
Centos软件安装工具yum，系统默认使用的是国外的centos更新源，导致默认更新源安装或者更新软件时速度很慢的问题，需要将默认的yum更新源配置为国内的更新源。yum更新源配置文件位于centos目录 /etc/yum.repos.d/ 下。
国内速度较快的常用更新源如下：
http://mirrors.163.com/centos/ 163-网易
http://mirrors.ta139.com/centos/ 中国移动通信（山东移动）
http://centos.ustc.edu.cn/centos/ 中国科学技术大学
http://mirror.neu.edu.cn/centos/ 东北大学
编辑yum配置文件：
#vi /etc/yum.repos.d/CentOS-Base.repo
[base]name=CentOS-$releasever - Basemirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/baseurl=http://mirrors.163.com/centos/$releasever/os/$basearch/http://mirrors.ta139.com/centos/$releasever/os/$basearch/http://centos.ustc.edu.cn/centos/$releasever/os/$basearch/http://mirror.neu.edu.cn/centos/$releasever/os/$basearch/gpgcheck=1gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6#released updates [updates]name=CentOS-$releasever - Updatesmirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates#baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/baseurl=http://mirrors.163.com/centos/$releasever/updates/$basearch/http://mirrors.ta139.com/centos/$releasever/updates/$basearch/http://centos.ustc.edu.cn/centos/$releasever/updates/$basearch/http://mirror.neu.edu.cn/centos/$releasever/updates/$basearch/gpgcheck=1gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6#additional packages that may be useful[extras]name=CentOS-$releasever - Extrasmirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras#baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/baseurl=http://mirrors.163.com/centos/$releasever/extras/$basearch/http://mirrors.ta139.com/centos/$releasever/extras/$basearch/http://centos.ustc.edu.cn/centos/$releasever/extras/$basearch/http://mirror.neu.edu.cn/centos/$releasever/extras/$basearch/gpgcheck=1gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6#additional packages that extend functionality of existing packages[centosplus]name=CentOS-$releasever - Plusmirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus#baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/baseurl=http://mirrors.163.com/centos/$releasever/centosplus/$basearch/http://mirrors.ta139.com/centos/$releasever/centosplus/$basearch/http://centos.ustc.edu.cn/centos/$releasever/centosplus/$basearch/http://mirror.neu.edu.cn/centos/$releasever/centosplus/$basearch/gpgcheck=1enabled=0gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6#contrib - packages by Centos Users[contrib]name=CentOS-$releasever - Contribmirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib#baseurl=http://mirror.centos.org/centos/$releasever/contrib/$basearch/baseurl=http://mirrors.163.com/centos/$releasever/contrib/$basearch/http://mirrors.ta139.com/centos/$releasever/contrib/$basearch/http://centos.ustc.edu.cn/centos/$releasever/contrib/$basearch/http://mirror.neu.edu.cn/centos/$releasever/contrib/$basearch/gpgcheck=1enabled=0gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
从以上配置文件可以看出，需要根据各家源情况 有选择的配置 [base] [updates] [addons] [extras] [centosplus] 这几项。
每一项只要修改baseurl 和gpgkey 为相应源地址即可。
然后使用如下命令更新到最新系统：
#rpm –import /etc/pki/rpm-gpg-key*
#yum upgrade
以上配置结束之后，要清空yum 缓存，并重建yum缓存，执行以下命令：
yum clean all && yum clean metadata && yum clean dbcache && yum makecache && yum update
Centos小白学习