記錄下CentOS 6.4環境將MySQL5.1升級至5.5.36的過程，希望對大家有個參考。

1.為了安全期間，首先需要備份原有數據

2.卸載原有MySQL，先停止原有的MySQL服務，再查找 find / -name mysql

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

/var/lib/mysql

/var/lib/mysql/mysql

/usr/lib64/mysql

并移除服務

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

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

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

3.安裝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.下載安裝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的過程中出錯了，提示Could NOT find Curses (missing:  CURSES_LIBRARY CURSES_INCLUDE_PATH)

執行以下代碼就可以了，執行好之后繼續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.接下來需要把之前備份下來的my.cnf文件，復制至/etc/my.cnf

MySQL會讀取/etc/my.cnf /etc/mysql/my.cnf /usr/local/mysql/etc/my.cnf /.my.cnf。左邊的文件優先級是最高的

6.配置好之后，我們就啟動mysql，發現有一個問題啟動MySQL提示:The server quit without updating PID file(…)失敗

查看my.cnf文件設置的日記文件地址/var/log/mysqld.log，錯誤提示如下

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

此報錯是由/etc/my.cnf配置文件下的[mysqld]設置字符集引起的，解決方法：將default-character-set=utf8 改為 character_set_server=utf8

7.通過mysql -u root -p命令連接mysql。（我們之前有安裝過mysql，數據庫文件還在，所以不需要再添加用戶設置權限了）

出現了錯誤信息：ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock'

出錯原因是我們mysql.sock文件在/usr/lib/mysql/文件夾下

可以嘗試通過下面命令連接，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)