mysql-libs-5.1.47-4.el6.i686 显示结果说明CentOS6.0系统自带了一个MySQL，我们需要删除这个老版本，用root用户执行下面语句
su -密码：rpm -e --nodeps mysql-libs-5.1.47-4.el6.i686先切换到"root"用户下，然后执行删除语句，删除之后，我们再次查看，发现已经成功删除了CentOS6.0自带的旧MySQL版本。在删除MySQL的rpm后，还要进行一些扫尾操作，网上有两种操作。（备注：我在这里两种都没有用到，发现系统中并没有其他残余的MySQL信息。）第一种善后处理：使用下面命令进行处理。rm -rf /var/lib/mysql*rm -rf /usr/share/mysql*另一种善后处理：卸载后 /var/lib/mysql 中的 /etc/my.cnf 会重命名为 my.cnf.rpmsave，/var/log/mysqld.log 会重命名为 /var/log/mysqld.log.rpmsave，如果确定没用后就手工删除。2）安装MySql 服务端rpm -ivh MySQL-server-5.6.22-1.linux_glibc2.5.x86_64.rpmPReparing... ########################################### [100%]1:MySQL-server ########################################### [100%]warning: user mysql does not exist - using rootwarning: group mysql does not exist - using root2014-08-10 22:43:44 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).2014-08-10 22:43:44 23012 [Note] InnoDB: Using atomics to ref count buffer pool pages2014-08-10 22:43:44 23012 [Note] InnoDB: The InnoDB memory heap is disabled2014-08-10 22:43:44 23012 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins2014-08-10 22:43:44 23012 [Note] InnoDB: Memory barrier is not used2014-08-10 22:43:44 23012 [Note] InnoDB: Compressed tables use zlib 1.2.32014-08-10 22:43:44 23012 [Note] InnoDB: Using Linux native AIO2014-08-10 22:43:44 23012 [Note] InnoDB: Not using CPU crc32 instructions2014-08-10 22:43:44 23012 [Note] InnoDB: Initializing buffer pool, size = 128.0M2014-08-10 22:43:44 23012 [Note] InnoDB: Completed initialization of buffer pool2014-08-10 22:43:45 23012 [Note] InnoDB: The first specified data file ./ibdata1 did not exist: a new database to be created!2014-08-10 22:43:45 23012 [Note] InnoDB: Setting file ./ibdata1 size to 12 MB2014-08-10 22:43:45 23012 [Note] InnoDB: Database physically writes the file full: wait...2014-08-10 22:43:45 23012 [Note] InnoDB: Setting log file ./ib_logfile101 size to 48 MB2014-08-10 22:43:46 23012 [Note] InnoDB: Setting log file ./ib_logfile1 size to 48 MB2014-08-10 22:43:46 23012 [Note] InnoDB: Renaming log file ./ib_logfile101 to ./ib_logfile02014-08-10 22:43:46 23012 [Warning] InnoDB: New log files created, LSN=457812014-08-10 22:43:46 23012 [Note] InnoDB: Doublewrite buffer not found: creating new2014-08-10 22:43:46 23012 [Note] InnoDB: Doublewrite buffer created2014-08-10 22:43:46 23012 [Note] InnoDB: 128 rollback segment(s) are active.2014-08-10 22:43:46 23012 [Warning] InnoDB: Creating foreign key constraint system tables.2014-08-10 22:43:47 23012 [Note] InnoDB: Foreign key constraint system tables created2014-08-10 22:43:47 23012 [Note] InnoDB: Creating tablespace and datafile system tables.2014-08-10 22:43:47 23012 [Note] InnoDB: Tablespace and datafile system tables created.2014-08-10 22:43:47 23012 [Note] InnoDB: Waiting for purge to start2014-08-10 22:43:47 23012 [Note] InnoDB: 5.6.22 started; log sequence number 0A random root passWord has been set. You will find it in '/root/.mysql_secret'.2014-08-10 22:43:48 23012 [Note] Binlog end2014-08-10 22:43:48 23012 [Note] InnoDB: FTS optimize thread exiting.2014-08-10 22:43:48 23012 [Note] InnoDB: Starting shutdown...2014-08-10 22:43:50 23012 [Note] InnoDB: Shutdown completed; log sequence number 16259772014-08-10 22:43:50 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).2014-08-10 22:43:50 23039 [Note] InnoDB: Using atomics to ref count buffer pool pages2014-08-10 22:43:50 23039 [Note] InnoDB: The InnoDB memory heap is disabled2014-08-10 22:43:50 23039 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins2014-08-10 22:43:50 23039 [Note] InnoDB: Memory barrier is not used2014-08-10 22:43:50 23039 [Note] InnoDB: Compressed tables use zlib 1.2.32014-08-10 22:43:50 23039 [Note] InnoDB: Using Linux native AIO2014-08-10 22:43:50 23039 [Note] InnoDB: Not using CPU crc32 instructions2014-08-10 22:43:50 23039 [Note] InnoDB: Initializing buffer pool, size = 128.0M2014-08-10 22:43:50 23039 [Note] InnoDB: Completed initialization of buffer pool2014-08-10 22:43:50 23039 [Note] InnoDB: Highest supported file format is Barracuda.2014-08-10 22:43:50 23039 [Note] InnoDB: 128 rollback segment(s) are active.2014-08-10 22:43:50 23039 [Note] InnoDB: Waiting for purge to start2014-08-10 22:43:50 23039 [Note] InnoDB: 5.6.22 started; log sequence number 16259772014-08-10 22:43:50 23039 [Note] Binlog end2014-08-10 22:43:50 23039 [Note] InnoDB: FTS optimize thread exiting.2014-08-10 22:43:50 23039 [Note] InnoDB: Starting shutdown...2014-08-10 22:43:52 23039 [Note] InnoDB: Shutdown completed; log sequence number 1625987A RANDOM PASSWORD HAS BEEN SET FOR THE MySQL root USER !You will find that password in '/root/.mysql_secret'.You must change that password on your first connect,no other statement but 'SET PASSWORD' will be accepted.See the manual for the semantics of the 'password expired' flag.Also, the account for the anonymous user has been removed.In addition, you can run:/usr/bin/mysql_secure_installationwhich will also give you the option of removing the test database.This is strongly recommended for production servers.See the manual for more instructions.Please report any problems athttp://bugs.mysql.com/The latest information about MySQL is available on the web athttp://www.mysql.comSupport MySQL by buying support/licenses athttp://shop.mysql.comNew default config file was created as /usr/my.cnf andwill be used by default by the server when you start it.You may edit this file to change server settings3）检测 MySQL 3306 端口是否安打开。测试是否成功可运行 netstat 看 MySQL 端口是否打开，如打开表示服务已经启动，安装成功。MySQL 默认的端口是3306。[root@hadoopMysql]#netstat -nat Active Internet connections (servers and established)Proto Recv-Q Send-Q Local Address Foreign Address Statetcp 0 0 0.0.0.0:50070 0.0.0.0:* LISTENtcp 0 0 0.0.0.0:22 0.0.0.0:* LISTENtcp 0 0 127.0.0.1:631 0.0.0.0:* LISTENtcp 0 0 127.0.0.1:25 0.0.0.0:* LISTENtcp 0 0 0.0.0.0:50010 0.0.0.0:* LISTENtcp 0 0 0.0.0.0:50075 0.0.0.0:* LISTENtcp 0 0 0.0.0.0:50020 0.0.0.0:* LISTENtcp 0 0 192.168.128.129:9000 0.0.0.0:* LISTENtcp 0 0 0.0.0.0:50090 0.0.0.0:* LISTENtcp 1 0 192.168.128.129:35744 63.130.76.64:80 CLOSE_WAITtcp 0 0 192.168.128.129:34847 192.168.128.129:9000 ESTABLISHEDtcp 0 0 192.168.128.129:35770 192.168.128.129:9000 TIME_WAITtcp 0 52 192.168.128.129:22 192.168.128.1:1297 ESTABLISHEDtcp 0 0 192.168.128.129:50968 61.135.185.247:80 ESTABLISHEDtcp 0 0 192.168.128.129:9000 192.168.128.129:34847 ESTABLISHEDtcp 0 0 :::34803 :::* LISTENtcp 0 0 :::22 :::* LISTENtcp 0 0 ::1:631 :::* LISTENtcp 0 0 :::8088 :::* LISTENtcp 0 0 :::13562 :::* LISTENtcp 0 0 :::8030 :::* LISTENtcp 0 0 :::8031 :::* LISTENtcp 0 0 :::8032 :::* LISTENtcp 0 0 :::8033 :::* LISTENtcp 0 0 :::8040 :::* LISTENtcp 0 0 :::8042 :::* LISTENtcp 0 0 ::ffff:192.168.128.129:8031 ::ffff:192.168.128.12:58051 ESTABLISHEDtcp 0 0 ::ffff:192.168.128.12:58051 ::ffff:192.168.128.129:8031 ESTABLISHED4）启动MySql 服务[root@hadoopMysql]#service mysql start Starting MySQL.......... SUCCESS!5）安装客户端[root@hadoopMysql]#rpm -ivh MySQL-client-5.6.22-1.linux_glibc2.5.x86_64.rpmPreparing... ########################################### [100%]1:MySQL-client ^C########################################### [100%] 安装完成5）MySQL的几个重要目录。MySQL安装完成后不像 SQL Server 默认安装在一个目录，它的数据库文件、配置文件和命令文件分别在不同的目录，了解这些目录非常重要，尤其对于Linux的初学者，因为 Linux本身的目录结构就比较复杂，如果搞不清楚MySQL的安装目录那就无从谈起深入学习。a、数据库目录 /var/lib/mysql/b、配置文件 /usr/share/mysql（mysql.server命令及配置文件）c、相关命令 /usr/bin(mysqladmin mysqldump等命令)d、启动脚本 /etc/rc.d/init.d/（启动脚本文件mysql的目录）如：/etc/rc.d/init.d/mysql start/restart/stop/status6）更改 MySQL 目录。由于MySQL数据库目录占用磁盘比较大，而MySQL默认的数据文件存储目录为 /"var/lib/mysql"，也可以把要把数据目录移到 "/" 根目录下的 "mysql_data" 目录中（如果做测试用就不用移动了）。停止 MySql 服务进程：service mysql stop或者 mysqladmin -u root -p shutdownMySQL默认用户名为"root"，此处的"root"与Linux的最高权限用户"root"不是一会儿，而且默认的用户"root"的密码为空，所以上图中让输入密码，直接点击回车即可。把 "/var/lib/mysql" 整个目录移到 "/mysql_data"mv /var/lib/mysql /mysql_data找到my.cnf配置文件如果"/etc/"目录下没有my.cnf配置文件，请到 "/usr/share/mysql/" 下找到 my-default.cnf 文件，拷贝其中一个合适的配置文件到 "/etc/" 并改名为 "my.cnf" 中。命令如下：cp /usr/share/mysql/my-medium.cnf /etc/my.cnf编辑MySQL的配置文件 "/etc/my.cnf"为保证MySQL能够正常工作，需要指明"mysql.sock"文件的产生位置，以及默认编码修改为UTF-8。用下面命令：vim /etc /my.cnf[mysqld] #下添加以下命令socket = /var/lib/mysql/mysql/mysql.sockdatadir=/mysql_data/mysql #如果你的数据存储位置要改变的话需要在这里指定存储目录character-set-server=utf8lower_case_table_names=1 #（注意linux下mysql安装完后是默认：区分表名的大小写，不区分列名的大小写；# lower_case_table_names = 0 0：区分大小写，1：不区分大小写）注意：1）最后一行，我在本地安装的时候没有添加此设置也可以照样运行起来，加不加还要看你们自己了。2）还有在此配置文件还有 [client] 的一下配置 其中也可以设置socket，datadir两个选项，我这里也没有（此处不做配置，因为只是安装 MySql 测试用），不知道是版本的原因还是什么，如果大家需要弄清楚这个怎么使用，那就自己先百度一下吧；3）如果你修改了数据的存储位置目录 ，则可以执行以下命令来修改MySQL启动脚本 "/etc/rc.d/init.d/mysql" 最后，需要修改MySQL启动脚本 /etc/rc.d/init.d/mysql，修改 datadir=/mysql_data/mysql。vim /etc/rc.d/init.d/mysql7）重新启动MySQL服务service mysql start发生错误：Starting MySQL ERROR! The server quit without updataing PID file....经百度后解决方法是：vi /etc/selinux/config把 SELINUX=enforcing 改为SELINUX=disabled后存盘退出重启机器试试，必须要重启，很关键。千辛万苦重启后盼望着能管用，结果 服务器启动不了了。。。。。显示错误：Kernel panic - not syncing: Attempted to kill init PS：太糟心了，安装个MySQL 费这么大的劲。。。经过百度又找到新的解决文案：解决办法系统启动的时候，按下 ‘e’ 键进入 grub 编辑界面，编辑 grub 菜单，选择 “kernel /vmlinuz-2.6.23.1-42.fc8 ro root=/dev/vogroup00/logvol00 rhgb quiet” 一栏，按‘e’键进入编辑，在末尾增加enforcing=0，即：kernel /vmlinuz-2.6.23.1-42.fc8 ro root=/dev/vogroup00/logvol00 rhgb quietenforcing=0按‘b’键继续引导，OK顺利前进。好吧终于顺利进入到 Linux 系统，启动MySQL 服务：service mysql start又提示错误：MySQL:StartingMySQL…..ERROR!TheserverquitwithoutupdatingPIDfile解决办法是因为 MySQL 没有初始化表/usr/bin/mysql_install_db --user=mysqlservice mysql start就可以重启MySQL 服务了。PS：安装个MySql 着实不容易啊。。。。。8）修改登录密码MySQL默认没有密码，安装完毕增加密码的重要性是不言而喻的。修改前，直接登录检查 MySql 端口是否开启：[root@hadoop ~]#netstat -ntlp | grep 3306tcp 0 0 :::3306 :::* LISTEN 5052/mysqld $：mysql报错：ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)发现 与设置 MySql 服务器的socket位置不一样。改一下 /etc/my.cn修改socket = /var/lib/mysql/mysql.sock --保存；再次进入：[root@hadoop init.d]# mysql又报错。。。ERROR 1045 (28000): access denied for user 'root'@'localhost' (using password: NO)百度一下解决方法：[root@hadoop~]#mysqld_safe --user=mysql --skip-grant-tables --skip-networking & mysql -u root mysql再次进入：[root@hadoop ~]# mysqlWelcome to the MySQL monitor. Commands end with ; or /g.Your MySQL connection id is 2Server version: 5.6.22 MySQL Community Server (GPL)Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '/h' for help. Type '/c' to clear the current input statement.mysql>OK 了总算安装成功了。。。在没有添加密码前，直接输入"mysql"就能登录到MySQL数据库里。修改登录密码：[root@hadoop~]mysqladmin -u root password 'root'格式：mysqladmin -u用户名 -p旧密码 password 新密码如果已经连接上了 MySql 可以使用下面语句 ：mysql>use mysql;mysql>UPDATE user SET Password=PASSWORD('root') where USER='root';Query OK, 4 rows affected (0.04 sec)Rows matched: 4 Changed: 4 Warnings: 0修改成功；本文参考博客：http://www.CUOXin.com/xia520pi/archive/2012/06/12/2546261.html多谢虾皮工作室新闻热点
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