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  • linux mysql 卸载 安装

     卸载mysql

    一、使用以下命令查看当前安装mysql情况,查找以前是否装有mysql

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    rpm -qa|grep -i mysql

    可以看到如下图的所示:

    显示之前安装了:

         MySQL-client-5.5.25a-1.rhel5

         MySQL-server-5.5.25a-1.rhel5

    2、停止mysql服务、删除之前安装的mysql

    删除命令:rpm -e –nodeps 包名

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    rpm -ev MySQL-client-5.5.25a-1.rhel5
    rpm -ev MySQL-server-5.5.25a-1.rhel5

    如果提示依赖包错误,则使用以下命令尝试

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    rpm -ev MySQL-client-5.5.25a-1.rhel5 --nodeps

    如果提示错误:error: %preun(xxxxxx) scriptlet failed, exit status 1

    则用以下命令尝试:

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    rpm -e --noscripts MySQL-client-5.5.25a-1.rhel5

    3、查找之前老版本mysql的目录、并且删除老版本mysql的文件和库

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    find / -name mysql

    查找结果如下:

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    find / -name mysql
     
    /var/lib/mysql
    /var/lib/mysql/mysql
    /usr/lib64/mysql

    删除对应的mysql目录

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    rm -rf /var/lib/mysql
    rm -rf /var/lib/mysql
    rm -rf /usr/lib64/mysql

    具体的步骤如图:查找目录并删除

    注意:卸载后/etc/my.cnf不会删除,需要进行手工删除

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    rm -rf /etc/my.cnf

    4、再次查找机器是否安装mysql

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    rpm -qa|grep -i mysql

    安装mysql

    检查是否安装了mysql

     

    报错:

     warning: MySQL-server-5.5.49-1.linux2.6.i386.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
      Preparing... ################################# [100%]
      file /usr/share/mysql/charsets/README from install of MySQL-server-5.5.49-1.linux2.6.i386 conflicts with file from package mariadb-libs-1:5.5.52-1.el7.x86_64
      file /usr/share/mysql/charsets/Index.xml from install of MySQL-server-5.5.49-1.linux2.6.i386 conflicts with file from package mariadb-libs-1:5.5.52-1.el7.x86_64
      file /usr/share/mysql/charsets/armscii8.xml from install of MySQL-server-5.5.49-1.linux2.6.i386 conflicts with file from package mariadb-libs-1:5.5.52-1.el7.x86_64
      file /usr/share/mysql/charsets/ascii.xml from install of MySQL-server-5.5.49-1.linux2.6.i386 conflicts with file from package mariadb-libs-1:5.5.52-1.el7.x86_64
      file /usr/share/mysql/charsets/cp1250.xml from install of MySQL-server-5.5.49-1.linux2.6.i386 conflicts with file from package mariadb-libs-1:5.5.52-1.el7.x86_64

    原因:这是由于yum安装了旧版本的GPG keys造成的 解决办法:后面加上  --force --nodeps 如:  rpm -ivh MySQL-server-5.5.46-1.linux2.6.x86_64.rpm --force --nodeps  

    报错 error: Failed dependencies:

      libaio.so.1 is needed by MySQL-server-5.5.49-1.linux2.6.i386
      libaio.so.1(LIBAIO_0.1) is needed by MySQL-server-5.5.49-1.linux2.6.i386
      libaio.so.1(LIBAIO_0.4) is needed by MySQL-server-5.5.49-1.linux2.6.i386

      输入命令 : yum install  libaio.so.1

    报libncurses.so.5 is needed by MySQL-client-5.5.49-1.linux2.6.i386

      输入命令 : yum install  libncurses.so.5 

     

    启动报错 Unit not found .

    启动失败,查看日志:cat /var/lib/mysql/JD.err

    初始化数据库:mysql_install_db --user=mysql

    (警告:无法使用解析程序查找主机“JD”。这可能意味着您的libc库与这个二进制MySQL版本不完全兼容。MySQL守护进程mysqld应该正常工作,除非主机名解析不能工作。这意味着在指定MySQL特权时,应该使用IP地址而不是主机名!安装MySQL系统表.。)

     配置hosts: vi /etc/hosts

    设置密码:

    use mysql;

    update user set password=password('123456') where user='root';(只适用mysql5.7以下版本,5.7版本没有password字段)

    mysql5.7:update mysql.user set authentication_string=password('123456') where user='root' and Host = 'localhost';

    flush privileges;  

    设置允许远程连接:

    1、新建用户远程连接mysql数据库
    grant all on *.* to root@'%' identified by '123456' with grant option; 
    flush privileges;
    允许任何ip地址(%表示允许任何ip地址)的电脑用root帐户和密码(123456)来访问这个mysql server。
    注意root账户不一定要存在。

    2、支持root用户允许远程连接mysql数据库
    grant all privileges on *.* to 'root'@'%' identified by '123456' with grant option;
    flush privileges;


    启动mysql:

    service mysql start;

    service mysqld start;

    mysql 启动失败,日志查看:

    tail -f 100 /var/log/mysqld.log

     (rm -rf ./* 删除当前目录所有文件;)


    mysql 5.7 安装教程 :

    1系统约定
    安装文件下载目录:/data/software
    Mysql目录安装位置:/usr/local/mysql
    数据库保存位置:/data/mysql
    日志保存位置:/data/log/mysql

    2下载mysql
    在官网:http://dev.mysql.com/downloads/mysql/ 中,选择以下版本的mysql下载:

    执行如下命名:
    #mkdir /data/software
    #cd /data/software

    --下载安装包 

    --建议:在windows上使用迅雷下载,速度很快(我的是1M/s),然后用工具(Xftp)上传到 /data/software目录下;
    #wget http://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.17-linux-glibc2.5-x86_64.tar.gz

    3解压压缩包到目标位置

    #cd /data/software

    --解压压缩包

    #tar -xzvf /data/software/mysql-5.7.17-linux-glibc2.5-x86_64.tar.gz

    --移动并修改文件名

    #mv /data/software/mysql-5.7.17-linux-glibc2.5-x86_64 /usr/local/mysql

    4创建数据仓库目录

    --/data/mysql 数据仓库目录
    # mkdir /data/mysql         
    #ls /data/

    5新建mysql用户、组及目录
    #      ---新建一个msyql组
    # useradd -r -s /sbin/nologin -g mysql mysql -d /usr/local/mysql     ---新建msyql用户禁止登录shell

    6改变目录属有者

    #cd /usr/local/mysql
    #pwd
    #chown -R mysql .
    #chgrp -R mysql .

    #chown -R mysql /data/mysql

    7配置参数
    # bin/mysqld --initialize --user=mysql --basedir=/usr/local/mysql --datadir=/data/mysql

     此处需要注意记录生成的临时密码,如上文结尾处的:YLi>7ecpe;YP
    #bin/mysql_ssl_rsa_setup  --datadir=/data/mysql

     

    8修改系统配置文件

    #cd /usr/local/mysql/support-files

    # cp my-default.cnf /etc/my.cnf
    # cp mysql.server /etc/init.d/mysql

    # vim /etc/init.d/mysql

    修改以下内容:

    9启动mysql

    # /etc/init.d/mysql start

    --登陆

    # mysql -hlocalhost -uroot -p

      --如果出现:-bash: mysql: command not found

      --就执行: # ln -s /usr/local/mysql/bin/mysql /usr/bin --没有出现就不用执行

    --输入第6步生成的临时密码

    --修改密码

    mysql> set password=password('root');

    --设置root账户的host地址(修改了才可以远程连接)

    mysql>grant all privileges on *.* to 'root'@'%' identified by 'root';
    mysql>flush privileges;

    --查看表

    mysql> use mysql;
    mysql> select host,user from user;

    --这里就可以使用远程连接测试了;

    10添加系统路径
    # vim /etc/profile
    添加:
    export PATH=/usr/local/mysql/bin:$PATH
    如下:

    # source /etc/profile

    11配置mysql自动启动
    # chmod 755 /etc/init.d/mysql
    # chkconfig --add mysql
    # chkconfig --level 345 mysql on

    以上就是linux环境Mysql 5.7.13安装教程,希望对大家的学习有所帮助。

    补充:

    --退出mysql命令窗口

    #exit

     --查看mysql状态

    #service mysql status

    --停止mysql

    #service mysql stop

    --启动mysql

    #service mysql start

    附my.cnf(这是一个配置mysql配置文件,暂时可以不用管,如你想钻研 你可以百度或google “mysql my.cnf 配置详情”)

    /etc/my.cnf
    # For advice on how to change settings please see
    # http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html
    # *** DO NOT EDIT THIS FILE. It's a template which will be copied to the
    # *** default location during install, and will be replaced if you
    # *** upgrade to a newer version of MySQL.

    [mysqld]

    # Remove leading # and set to the amount of RAM for the most important data
    # cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
    innodb_buffer_pool_size = 10G

    # Remove leading # to turn on a very important data integrity option: logging
    # changes to the binary log between backups.
    log_bin
    character-set-server=utf8
    collation-server=utf8_bin
    init-connect='SET NAMES utf8'
    # These are commonly set, remove the # and set as required.
    basedir = /usr/local/mysql
    datadir = /export/mysql/var
    port = 3306
    server_id = 22206
    socket = /export/mysql/mysql.sock
    binlog_format = statement
    # Remove leading # to set options mainly useful for reporting servers.
    # The server defaults are faster for transactions and fast SELECTs.
    # Adjust sizes as needed, experiment to find the optimal values.
    join_buffer_size = 128M
    sort_buffer_size = 2M
    read_rnd_buffer_size = 2M
    log_bin_trust_function_creators = on
    sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

    lower_case_table_names=1

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  • 原文地址:https://www.cnblogs.com/mryangbo/p/11136867.html
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