CentOS系统中MySQL5.1升级至5.5.36

记录下centos 6.4环境将mysql5.1升级至5.5.36的过程，希望对大家有个参考。

1.为了安全期间，首先需要备份原有数据

2.卸载原有mysql，先停止原有的mysql服务，再查找 find / -name mysql

[root@linuxidc /]# find / -name mysql

/var/lib/mysql

/var/lib/mysql/mysql

/usr/lib64/mysql

并移除服务

[root@linuxidc /]# rm -rf /var/lib/mysql

[root@linuxidc /]# rm -rf /var/lib/mysql

[root@linuxidc /]# rm -rf /usr/lib64/mysql

3.安装cmake

[root@linuxidc download]# wget http://www.cmake.org/files/v2.8/cmake-2.8.12.2.tar.gz

[root@linuxidc download]# tarx zvfc cmake-2.8.12.2.tar.gz

[root@linuxidc download]# cd cmake-2.8.12.2

[root@linuxidc cmake-2.8.12.2]# ./configure

[root@linuxidc cmake-2.8.12.2]# make && make install

4.下载安装mysql5.5.36

[root@linuxidc download]# wget http://dev.mysql.com/get/downloads/mysql-5.5/mysql-5.5.36.tar.gz

[root@linuxidc download]# tar xzvf mysql-5.5.36.tar.gz

[root@linuxidc download]# cd mysql-5.5.36

[root@linuxidc mysql-5.5.36]# cmake -dcmake_install_prefix=/usr/local/mysql -dextra_charsets=all -ddefault_charset=utf8 -ddefault_collation=utf8_general_ci -dwith_readline=1 -dwith_ssl=system -dwith_zlib=system -dwith_embedded_server=1 -denabled_local_infile=1 -dmysql_datadir=/home/mysql

[root@linuxidc mysql-5.5.36]# make && make install

在cmake的过程中出错了，提示could not find curses (missing:  curses_library curses_include_path)

执行以下代码就可以了，执行好之后继续cmake，然后再make && make install

[root@localhost mysql-5.5.36]# rm cmakecache.txt

[root@localhost mysql-5.5.36]# yum install ncurses-devel

5.接下来需要把之前备份下来的my.cnf文件，复制至/etc/my.cnf

mysql会读取/etc/my.cnf /etc/mysql/my.cnf /usr/local/mysql/etc/my.cnf /.my.cnf。左边的文件优先级是最高的

6.配置好之后，我们就启动mysql，发现有一个问题启动mysql提示:the server quit without updating pid file(…)失败

查看my.cnf文件设置的日记文件地址/var/log/mysqld.log，错误提示如下

170715 12:31:36 mysqld_safe mysqld from pid file /var/lib/mysql/linuxidc.pid ended

170715 12:57:48 mysqld_safe starting mysqld daemon with databases from /home/mysql

170715 12:57:48 innodb: the innodb memory heap is disabled

170715 12:57:48 innodb: mutexes and rw_locks use gcc atomic builtins

170715 12:57:48 innodb: compressed tables use zlib 1.2.3

170715 12:57:48 innodb: initializing buffer pool, size = 128.0m

170715 12:57:48 innodb: completed initialization of buffer pool

170715 12:57:48 innodb: highest supported file format is barracuda.

170715 12:57:48  innodb: waiting for the background threads to start

170715 12:57:49 innodb: 5.5.36 started; log sequence number 2645823

170715 12:57:49 [error] /usr/local/mysql/bin/mysqld: unknown variable 'default-character-set=utf8'

170715 12:57:49 [error] aborting

此报错是由/etc/my.cnf配置文件下的[mysqld]设置字符集引起的，解决方法：将default-character-set=utf8 改为 character_set_server=utf8

7.通过mysql -u root -p命令连接mysql。（我们之前有安装过mysql，数据库文件还在，所以不需要再添加用户设置权限了）

出现了错误信息：error 2002 (hy000): can't connect to local mysql server through socket '/tmp/mysql.sock'

出错原因是我们mysql.sock文件在/usr/lib/mysql/文件夹下

可以尝试通过下面命令连接，并查看mysql版本

[root@linuxidc var]# mysql -u root -p -s /usr/lib/mysql/mysql.sock

mysql> select version();

+-----------+

| version() |

+-----------+

| 5.5.36    |

+-----------+

1 row in set (0.00 sec)