写在前面的话
1.本文参考了[蓝狐的博客](http://www.bluefoxah.org/ "蓝狐的博客")中[《新版Teamtalk部署教程》](http://www.bluefoxah.org/teamtalk/new_tt_deploy.html "《新版Teamtalk部署教程》")中的部分内容。
2.本文配置中使用的是腾讯云的虚拟机
日常初始化Centos主机，主要的思路和流程是修改源、卸载非必要的软件、安装常用软件、系统升级、*配置lnmp（选配）、安全配置（后面再写）。
修改源
个人比较推荐的源有两个，一个是[大连东软学院的开源镜像站](http://mirrors.neusoft.edu.cn/ "大连东软学院的开源镜像站")，另外一个是[清华大学开源软件镜像站](https://mirror.tuna.tsinghua.edu.cn/ "清华大学开源软件镜像站")，因为在我这这两个源的速度很快,但具体的还是要测一下，优先选择速度最快的源。介于使用的是腾讯云，在此就不修改，只贴出流程。
备份并编辑源文件
shell
sudo mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak vim /etc/yum.repos.d/CentOS-Base.repo修改源信息
东软源，注意，大连东软学院的开源镜像站的修改步骤是之2、3，即不需要执行1命令，直接执行该条命令，后在执行3命令即可。
shell
sed -e "s/^mirrorlist/#mirrorlist/g" -e"s/#baseurl/baseurl/g" -e "s/mirror\.centos\.org/mirrors.neusoft.edu.cn/g" -i /etc/yum.repos.d/CentOS-Base.repo清华大学开源软件镜像站
# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client. You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
#
#
[base]
name=CentOS-$releasever - Base
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/os/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#released updates
[updates]
name=CentOS-$releasever - Updates
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/updates/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/extras/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/centosplus/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7163源，查看帮助，可以直接下载对应版本的repo文件
http://mirrors.163.com/.help/centos.html科大源，可下载repo文件，也可以直接编辑
https://lug.ustc.edu.cn/wiki/mirrors/help/centos# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client. You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
#
#
[base]
name=CentOS-$releasever - Base
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
baseurl=http://mirrors.ustc.edu.cn/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#released updates
[updates]
name=CentOS-$releasever - Updates
# mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
baseurl=http://mirrors.ustc.edu.cn/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
# mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
baseurl=http://mirrors.ustc.edu.cn/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
# mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus
baseurl=http://mirrors.ustc.edu.cn/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7搜狐源， 同163源，可直接下载repo文件
http://mirrors.sohu.com/help/centos.html执行更新命令
sudo yum makecache卸载非必要的软件
卸载这些软件，主要为后面安装lnmp减少一些不必要的麻烦
yum -y remove httpd* php* mysql-server mysql mysql-libs php-mysq安装常用软件
yum -y install wget vim git texinfo patch make cmake gcc gcc-c++ gcc-g77 flex bison file libtool libtool-libs autoconf kernel-devel libjpeg libjpeg-devel libpng libpng-devel libpng10 libpng10-devel gd gd-devel freetype freetype-devel libxml2 libxml2-devel zlib zlib-devel glib2 glib2-devel bzip2 bzip2-devel libevent libevent-devel ncurses ncurses-devel curl curl-devel e2fsprogs e2fsprogs-devel krb5 krb5-devel libidn libidn-devel openssl openssl-devel vim-minimal nano fonts-chinese gettext gettext-devel ncurses-devel gmp-devel pspell-devel unzip libcap diffutils screen系统升级
sudo yum -y update
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