• MHA简单部署


    MHA是目前比较成熟的mysql高可用集群方式之一.

    一、参考文档:
    1.官方文档:【 https://github.com/yoshinorim/mha4mysql-manager/wiki 】
    2.个人博客: 好多
    3.下载地址:
    (1)manager:【 https://github.com/yoshinorim/mha4mysql-manager/releases 】
    (2)node: 【 https://github.com/yoshinorim/mha4mysql-node/releases/tag/v0.58 】

    二、基础环境
    1.操作系统:Centos 7.4
    2.mysql版本:percona-mysql 5.7.22
    3.MHA版本:0.58
    4.服务器信息

    三、部署流程
    1.安装node
    # master,slave-01
    (1)下载安装包

    mkdir -p /opt/upload/mha_packges 
    cd opt/upload/mha_packges
    wget 'https://github.com/yoshinorim/mha4mysql-node/releases/download/v0.58/mha4mysql-node-0.58-0.el7.centos.noarch.rpm'


    (2)安装node

    yum -y install perl-DBD-MySQL -y
    yum -y localinstall mha4mysql-node-0.58-0.el7.centos.noarch.rpm

    2.安装manager
    #172.18.6.14
    (1)下载安装包

    mkdir -p /opt/upload/mha_packges
    cd /opt/upload/mha_packges
    wget 'https://github.com/yoshinorim/mha4mysql-node/releases/download/v0.58/mha4mysql-node-0.58-0.el7.centos.noarch.rpm'
    wget 'https://github.com/yoshinorim/mha4mysql-manager/releases/download/v0.58/mha4mysql-manager-0.58-0.el7.centos.noarch.rpm'


    (2)安装manager及node

    yum -y install perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager
    yum -y localinstall mha4mysql-node-0.58-0.el7.centos.noarch.rpm
    yum -y localinstall mha4mysql-manager-0.58-0.el7.centos.noarch.rpm


    3.添加hosts
    #master-01,slave-01,slave-02操作

    cat <<EOF>> /etc/hosts
    172.18.6.15 mysql_master-01
    172.18.6.13 mysql_slave-01
    172.18.6.14 mysql_slave-02
    EOF

    4.配置免密登陆
    (1)配置三台服务器免密登陆
    (2)测试命令:masterha_check_ssh --conf=/opt/ mha/conf/default.cnf
    5.创建manager工作目录
    mkdir -p /opt/mha/{manager_data,remote_data,manager_logs,conf}

    6.生成manager配置文件

    cat <<EOF> /opt/mha/conf/default.cnf 
    [server default]
    # mha_directory #
    manager_workdir=/opt/mha/manager_data
    manager_log=/opt/mha/manager_logs/manager.log
    remote_workdir=/opt/mha/remote_data
     
    # mha_setting #
    ping_interval=1
    shutdown_script=""
    master_ip_failover_script="/usr/bin/master_ip_failover"
    master_ip_online_change_script="/usr/bin/master_ip_online_change"
     
    # DATABASE #
    user=mha
    password=dingkai123 #最好不要用特殊字符,mha难以识别
     
    # SSH #
    ssh_user=root
    ssh_port=10022
    repl_user=repl #mysql主从复制账号
    repl_password=dingkai.123 #mysql主从复制账号密码
    master_binlog_dir=/opt/mysql/mysql_log #binlog目录
     
    [server1]
    hostname= mysql_master-01
    port=3306
    master_binlog_dir=/opt/mysql/mysql_log
    candidate_master=1
    check_repl_delay=0
     
    [server2]
    hostname=mysql_slave-01
    port=3306
    master_binlog_dir=/opt/mysql/mysql_log
    candidate_master=1
    check_repl_delay=0
     
    [server3]
    hostname=mysql_slave-02
    port=3306
    master_binlog_dir=/opt/mysql/mysql_log
    no_master=1
     
    [binlog1]
    hostname=mysql_master-01
    EOF

    5.在master创建mha管理账号
    grant all privileges on *.* to mha@172.18.6.% identified by 'MFdb@2018!';
    6.修改‘master_ip_failover’ ,'master_ip_online_change'脚本(这两个脚本在manager源码中的 mha4mysql-manager-0.58/samples/scripts 下)
    (1)修改master_ip_failover
    添加

    my $vip = '172.18.6.251/32';
    my $key = '0';
    my $ssh_port = '10022';
    my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip";
    my $ssh_stop_vip = "/sbin/ifconfig eth0:$key down";

    (2)修改master_ip_online_change
    #添加以下内容

    my $vip = '172.18.6.251/32';
    my $ssh_port = '10022';
    my $if = "eth0";

    
    

    (3)添加脚本到 /usr/bin/下

    cp -a master_ip_failover master_ip_online_change /usr/bin/
    chmod +x /usr/bin/master_ip_failover
    chmod +x /usr/bin/master_ip_online_change


    6.配置虚拟网卡
    #master实例操作
    ifconfig eth0:0 172.18.6.201/32

    7.检查复制情况
    #slave-02执行
    masterha_check_repl --conf=/opt/mha/conf/default.cnf #检查复制状态
    masterha_manager --conf=/opt/mha/conf/default.cnf #启动mha
    masterha_check_status --conf=/opt/mha/conf/default.cnf #查看mha运行状态

    8.使用脚本控制
    (1)创建mha控制脚本
    cat <<EOF> /usr/bin/mha.sh 
    #!/usr/bin/bash
    #filename: mha.sh
    #用途:启动关闭MHA
    
    #VARIABLES
    config_file="/opt/mha/conf/default.cnf "
    base_path="/opt/mha "
    log_path="/opt/mha/manager_logs"
    masterha_manager="/usr/bin/masterha_manager"
    masterha_stop="/usr/bin/masterha_stop"
    masterha_check_status="/usr/bin/masterha_check_status"
    mha_status=$(masterha_check_status --conf=/opt/mha/conf/default.cnf |grep -w 'pid'|awk -F" " '{print $2}'|awk -F":" '{print $2}'|awk -F")" '{print $1}')
    
    #functions
    start(){
        if [ -z ${mha_status} ]
        then
          /usr/bin/nohup ${masterha_manager} --conf=${config_file} > ${log_path}/nohup.log 2>&1 &
        else
          echo "MHA is Running!"
        fi
    }
    
    stop(){
        if [ ! -z ${mha_status} ]
        then
          ${masterha_stop}  --conf=${config_file}
        else
          echo "MHA is not running!"
        fi 
    }

    (2)脚本命令
    mha.sh start #启动mha
    mha.sh stop #停止mha
    mha.sh status #查看mha状态

    注意:当master宕机后,mha会自动将一个slave节点提升为主,随后mha自动停止运行,在手动恢复数据库之前,mha都是不可用的

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  • 原文地址:https://www.cnblogs.com/dingkailinux/p/9909138.html
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