配置阿里云yum源

1. 修改默认的yum仓库，把原有的移动到创建的目录里（踢出国外的yum源）

# 切换到/ect/yum.repos.d/目录下
cd /etc/yum.repos.d/
# 新建repo目录
mkdir repo
# 把原有的移动到创建的目录里
mv ./*.repo ./repo/

1. 配置yum源

# 找到阿里云的官方镜像源地址
https://opsx.alibaba.com/mirror

1. 如果没有wget 可以先yum安装

yum -y install wget

1. 下载centos7的yum源

# wget下载
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
# curl下载（如果yum安装wget失败的话用curl）
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

1. 清空旧的yum缓存

yum clean all

1. 生成新的yum仓库缓存（这个缓存来自于阿里云的yum仓库，便于加速软件下载）

yum makecache

1. 显示当前可用yum源

yum repolist

1. 安装CentOS基础依赖

yum -y install gcc gcc-c++ make ntpdate bzip2-devel curl-devel libjpeg-devel libpng-devel freetype-devel libXpm-devel gmp-devel openldap-devel unixODBC-devel postgresql-devel sqlite-devel net-snmp-devel libxslt-devel libxml2-devel pcre pcre-devel mysql-devel libmemcached zlib zlib-devel vim wget lrzsz tree nmap elinks openssl openssl-devel curl lynx net-tools dos2unix nc tcpdump iotop sysstat vim-enhanced ruby patch bash-completion zip unzip lsof psmisc python-devel expat-devel libnl-devel cyrus-sasl*

1. 因为CentOS7操作系统默认安装mariadb-libs库，它与MySQL冲突，影响初始化

yum -y remove mariadb-libs