RPM安装mysql 5.5.48

下载对应的MySQL安装包rpm文件,可以去MySQL官方网站找到对应版本,一般需要下载3个文件
MySQL-server
MySQL-client
MySQL-devel

wget http://dev.mysql.com/get/Downloads/MySQL-5.5/MySQL-server-5.5.48-1.el6.x86_64.rpm
wget http://dev.mysql.com/get/Downloads/MySQL-5.5/MySQL-client-5.5.48-1.el6.x86_64.rpm
wget http://dev.mysql.com/get/Downloads/MySQL-5.5/MySQL-devel-5.5.48-1.el6.x86_64.rpm


rpm -ivh MySQL-server-5.5.48-1.el6.x86_64.rpm
rpm -ivh MySQL-client-5.5.48-1.el6.x86_64.rpm
rpm -ivh MySQL-devel-5.5.48-1.el6.x86_64.rpm

安装服务端出错:

[root@localhost ~]# rpm -ivh MySQL-server-5.5.48-1.el6.x86_64.rpm
warning: MySQL-server-5.5.48-1.el6.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing...                ########################################### [100%]
        file /usr/share/mysql/charsets/Index.xml from install of MySQL-server-5.5.48-1.el6.x86_64 conflicts with file from package mysql-libs-5.1.73-5.el6_6.x86_64
        file /usr/share/mysql/charsets/armscii8.xml from install of MySQL-server-5.5.48-1.el6.x86_64 conflicts with file from package mysql-libs-5.1.73-5.el6_6.x86_64
        file /usr/share/mysql/charsets/ascii.xml from install of MySQL-server-5.5.48-1.el6.x86_64 conflicts with file from package mysql-libs-5.1.73-5.el6_6.x86_64
        file /usr/share/mysql/charsets/cp1250.xml from install of MySQL-server-5.5.48-1.el6.x86_64 conflicts with file from package mysql-libs-5.1.73-5.el6_6.x86_64
        file /usr/share/mysql/charsets/cp1256.xml from install of MySQL-server-5.5.48-1.el6.x86_64 conflicts with file from package mysql-libs-5.1.73-5.el6_6.x86_64

错误原因:包冲突了
centos6.7 basic server 版本 默认安装了mysql5.1,所以先卸载mysql5.1

yum -y remove mysql-libs-5.1*

再重新安装即可

rpm -ivh MySQL-server-5.5.48-1.el6.x86_64.rpm

启动mysql

[root@localhost ~]# service mysql start
Starting MySQL SUCCESS!

CentOS下安装官方RPM包的MySQL后找不到my.cnf解决办法

复制 /usr/share/mysql/my-medium.cnf 文件到/etc目录,

cp /usr/share/mysql/my-medium.cnf /etc/my.cnf

局域网内mysql连接慢的解决办法

ping都很快,mysql连接慢,
原因是由于mysql对连接的客户端进行DNS反向解析。
有2种解决办法:
1,把client的ip写在mysql服务器的/etc/hosts文件里,随便给个名字就可以了。
2,在 my.cnf 中加入 –skip-name-resolve 。