单机Ubuntu安装第二个Mysql服务

第一个Mysql服务是按照官方的apt-get下载下来的,唯一改的就是配置文件
安装第二个Mysql服务的原因是因为需要部署主从同步+读写分离

一、安装配置第二个mysql服务

参考链接

  1. 新建目录

    • 新建实例目录

      mkdir /usr/mysql/mysql_3307
      
    • 赋权

      chown -R mysql.mysql  /usr/mysql/mysql_3307
      
    • apparmor中配置对目录文件的访问权限

      # 编辑配置
      vim /etc/apparmor.d/usr.sbin.mysqld
      	/usr/mysql/mysql_3307/ r,
      	/usr/mysql/mysql_3307/** rwk,
      	
      /opt/mysql/mysql_3307/mysqld_3307.pid rw,
      /opt/mysql/mysql_3307/data/ r,
        /opt/mysql/mysql_3307/data/** rwk,
        /opt/mysql/mysql_3307/log/ r,
        /opt/mysql/mysql_3307/log/** rw,
      # 刷新培训
      service apparmor restart
      

  2. 复制多个MySQL配置文件

    mysql启动时会读取配置文件my.cnf,要配置多个实例需要复制多个my.cnf配置文件。

    在mysql5.7版本中/etc/mysql/目录下的my.cnf文件是个软链接,关联的是/etc/mysql/mysql.conf.d目录下的mysqld.cnf文件,配置信息全部在mysqld.cnf中,所以可以直接复制mysqld.cnf命名为mysqld_3307.cnf作为启动配置文件。

    ## 修改mysqld_3307.cnf配置 ##
    
    [mysqld_safe]
    socket          = /usr/mysql/mysql_3307/mysqld.sock
    # nice          = 0
    
    [mysqld]
    user            = mysql
    pid-file        = /usr/mysql/mysql_3307/mysqld.pid
    socket          = /usr/mysql/mysql_3307/mysqld.sock
    port            = 3307
    basedir         = /usr
    datadir         = /usr/mysql/mysql_3307
    tmpdir          = /tmp
    lc-messages-dir = /usr/share/mysql
    skip-external-locking
    
    bind-address            = 0.0.0.0
    
    log_error = /usr/mysql/mysql_3307/error.log
    

  3. 初始化Mysql文件

    # 5.7版本
    mysqld --initialize --user=mysql --basedir=/usr  --datadir=/usr/mysql/mysql_3307
    
    # 5.6版本会出现以下提示
    mysql_install_db --defaults-file=/etc/mysql/mysql.conf.d/mysqld_3307.cnf --basedir=/usr/ --datadir=/usr/mysql/mysql_3307 --user=mysql
    # 2111:29:05[WARNING]mysql_install_db is deprecated. Please consider switching to mysqld --initialize
    

  4. 修改密码

    • 启动实例

      先通过安全模式启动实例,跳过安全认证登录后修改root密码

    mysqld_safe --defaults-file=/etc/mysql/mysql.conf.d/mysqld_3307.cnf  &
    
    • 修改密码
    # 无密码登录
    mysql -S /usr/mysql/mysql_3307/mysqld.sock -P 3307
    # 修改密码
    update user set authentication_string=password('123456') where user='root';
    flush privileges;
    quit;
    
    • 关闭实例后再次启动实例
    # 关闭实例
    mysqladmin -u root -p -S /usr/mysql/mysql_3307/mysqld.sock shutdown
    

    异常:登录后执行命令的时候提示错误

    ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this start
    # 解决方案:设置密码
    set password="YOUR_PASSWORD";
    

    异常:使用无密码登录时,出现异常,链接

    ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
    # 在[mysqld]后添加skip-grant-tables(使用 set password for设置密码无效,且此后登录无需键入密码)
    skip-grant-tables
    
    

二、主从同步配置

  1. 主库配置(/etc/mysql/mysql.conf.d/mysqld.cnf
# 设置master的serverid
server-id               = 1
# 要生成的二进制日记文件名称
log_bin                 = /var/log/mysql/mysql-bin.log
# 要同步的数据库
binlog_do_db            = marcosys

  1. 为主服务器注册新用户,用于从库链接
grant replication slave on *.* to 'replication'@'%' identified by '123456';
  • 异常
# 若出现异常:
ERROR 1290 (HY000): The MySQL server is running with the --skip-grant-tables option so it cannot execute this statement
# 方案
flush privileges;

  1. 记录FilePosition的值
show master status;

  1. 从库配置(/etc/mysql/mysql.conf.d/mysqld_3307.cnf
server-id		= 2
replicate-do-db=marcosys
  1. 从库设置
# 设置主库信息
change master to master_host='127.0.0.1',master_port=3306,master_user='replication',master_password='123456',master_log_file='mysql-bin.000001',master_log_pos=767;
# 启动从机
start slave;
# 检查状态
show slave status\G;
# 状态标准
lave_IO_Running: Yes
Slave_SQL_Running: Yes
Master_Log_File: mysql-bin.000001
Relay_Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 767
Exec_master_log_pos: 767
posted @ 2020-09-18 13:41  久末丶  阅读(423)  评论(0编辑  收藏  举报