准备篇
1.配置防火墙，开启80端口、3306端口
1 vim /etc/sysconfig/iptables
2 -A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT #允许80端口通过防火墙
3 -A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT #允许3306端口通过防火墙
service iptables restart #重启防火墙，使配置生效
2.关闭SELINUX（这个和服务器安全相关，先关闭。相关介绍：https://wiki.centos.org/zh/HowTos/SELinux）
vim /etc/selinux/config #SELINUX=enforcing #注释掉 #SELINUXTYPE=targeted #注释掉 SELINUX=disabled #增加 :wq #保存退出 shutdown -r now #重启系统
3.安装第三方源
1)安装EPEL仓库
yum install -y epel-release
如果以上命令不起作用：
CentOS/RHEL 7
rpm -Uvh http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-5.noarch.rpm
CentOS/RHEL 6
rpm -Uvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
2)安装IUS仓库
CentOS 6
rpm -Uvh https://centos6.iuscommunity.org/ius-release.rpm
CentOS 7
rpm -Uvh https://centos7.iuscommunity.org/ius-release.rpm
错误处理:
1.安装IUS仓库出错：curl: (35) SSL connect error。这个问题在RHEL 6.1 -> RHEL 6.4应该都会出现，原因是curl使用了REST API。解决：
yum update nss
2.结果问题1没解决，出另一个问题：Error: Cannot retrieve metalink for repository: epel. Please verify its path and try again。解决：
vim /etc/yum.repos.d/CentOS-Base.repo
把有mirrorlist的都注释掉，有baseurl的都去掉注释，然后再进行步骤1，再安装IUS仓库。修改如下：
[epel] name=Extra Packages for Enterprise Linux 6 - $basearch baseurl=http://download.fedoraproject.org/pub/epel/6/$basearch #mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-6&arch=$basearch failovermethod=priority enabled=1 gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6 [epel-debuginfo] name=Extra Packages for Enterprise Linux 6 - $basearch - Debug baseurl=http://download.fedoraproject.org/pub/epel/6/$basearch/debug #mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-debug-6&arch=$basearch failovermethod=priority enabled=0 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6 gpgcheck=1 [epel-source] name=Extra Packages for Enterprise Linux 6 - $basearch - Source baseurl=http://download.fedoraproject.org/pub/epel/6/SRPMS #mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-source-6&arch=$basearch failovermethod=priority enabled=0 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6 gpgcheck=1
查看仓库列表，看看是否安装成功了：
