搭建 MySQL MHA
- 搭建 MySQL MHA
- 实验拓扑图
- 实验环境
- 实验思路
- MHA架构
- 故障模拟
- 实验部署
- 数据库安装
- 主从复制部署
- 时间同步
- 主服务器配置
- 从服务器配置
- 创建链接
- MHA搭建
- 安装依赖的环境
- 安装 node 组件
- 安装 manager 组件
- 配置无密码认证
- 在 manager 节点上配置 MHA
- 管理 mysql 节点服务器
- 创建相关目录
- 编写配置文件
- 手动开启虚拟IP
- 测试 ssh 无密码认证及 MySQL主从连接情况
- 启动 MHA
- 故障模拟———— Master 节点意外故障
- 停止 Master 节点MySQL服务
- 查看 mysql2 是否接管 VIP
- 修复故障
- 启动原来的主节点
- 修复数据
- 在 manager 节点上修改配置文件
- 对mysql1和mysql2 进行重启
- 在 manager 节点上启动 MHA
搭建 MySQL MHA
实验拓扑图
实验环境
| 主机 | IP |
|---|---|
| Master主库服务器 | 10.190.33.71 |
| Slave从库服务器01 | 10.190.33.72 |
| Slave从库服务器02 | 10.190.33.73 |
| MHA Manager服务器 | 10.190.33.74 |
| Client | 10.190.33.75 |
实验思路
MHA架构
- 数据库安装
- 一主两从
- MHA搭建
故障模拟
- 主库失效
- 备选主库成为主库
- 原故障主库恢复重新加入到MHA成为从库
实验部署
数据库安装
MySQL安装教程
主从复制部署
时间同步
所有服务器均需要进行配置(仅以Master服务器举例)
yum install -y chronyvim /etc/chrony.conf #注释原有ntp服务器，添加阿里ntp服务源server ntp.aliyun.com iburstsystemctl restart chronydchronyc sources -vsystemctl enable --now chronyd
主服务器配置
vim /etc/my.cnfserver-id=1log_bin = mysql-binbinlog_format = mixedlog-slave-updates = truerelay-log = relay-log-binrelay-log-index = slave-relay-bin.index systemctl restart mysqld
mysql -u root -pAdmin@123grant replication slave on *.* to 'myslave'@'10.190.33.%' identified by 'Admin@123';grant all privileges on *.* to 'manager'@'10.190.33.%' identified by 'Admin@123';grant all privileges on *.* to 'manager'@'10.190.33.71' identified by 'Admin@123';grant all privileges on *.* to 'manager'@'10.190.33.72' identified by 'Admin@123';grant all privileges on *.* to 'manager'@'10.190.33.73' identified by 'Admin@123';flush privileges;show master status;
从服务器配置
vim /etc/my.cnfserver-id = 2log_bin = mysql-binbinlog_format = mixedlog-slave-updates = truerelay-log = relay-log-binrelay-log-index = slave-relay-bin.indexsystemctl restart mysqldmysql -u root -pAdmin@123grant replication slave on *.* to 'myslave'@'10.190.33.%' identified by 'Admin@123';grant all privileges on *.* to 'manager'@'10.190.33.%' identified by 'Admin@123';grant all privileges on *.* to 'manager'@'10.190.33.71' identified by 'Admin@123';grant all privileges on *.* to 'manager'@'10.190.33.72' identified by 'Admin@123';grant all privileges on *.* to 'manager'@'10.190.33.73' identified by 'Admin@123';flush privileges;change master to master_host='10.190.33.71',master_user='myslave',master_password='Admin@123',master_log_file='mysql-bin.000001',master_log_pos=3400;start slave;show slave status\Gset global read_only=1;
- Slave1
- Slave2
创建链接
所有的数据库服务器(仅以Master服务器举例)
ln -s /usr/local/mysql/bin/mysql /usr/sbin/ln -s /usr/local/mysql/bin/mysqlbinlog /usr/sbin/
MHA搭建
安装依赖的环境
所有的服务器(仅以Master服务器举例)
yum install epel-release --nogpgcheck -yyum install -y perl-DBD-MySQL \
perl-Config-Tiny \
perl-Log-Dispatch \
perl-Parallel-ForkManager \
perl-ExtUtils-CBuilder \
perl-ExtUtils-MakeMaker \
perl-CPAN
安装 node 组件
所有的服务器(仅以Master服务器举例)
cd /opttar xf mha4mysql-node-0.57.tar.gzcd mha4mysql-node-0.57perl Makefile.PLmake && make install
安装 manager 组件
manager服务器
cd /opttar xf mha4mysql-manager-0.57.tar.gzcd mha4mysql-manager-0.57perl Makefile.PLmake && make install
配置无密码认证
所有的服务器
#manager节点上配置到所有数据库节点的无密码认证ssh-keygen -t rsassh-copy-id 10.190.33.71ssh-copy-id 10.190.33.72ssh-copy-id 10.190.33.73#master节点上配置到数据库节点 slave1 和 slave2的无密码认证ssh-keygen -t rsassh-copy-id 10.190.33.72ssh-copy-id 10.190.33.73#slave1节点上配置到数据库节点 master和 slave2的无密码认证ssh-keygen -t rsassh-copy-id 10.190.33.71ssh-copy-id 10.190.33.73#slave2节点上配置到数据库节点 master和 slave1 的无密码认证ssh-keygen -t rsassh-copy-id 10.190.33.71ssh-copy-id 10.190.33.72- manager
- master
- slave1
- slave2
在 manager 节点上配置 MHA
cp -rp /opt/mha4mysql-manager-0.57/samples/scripts /usr/local/binll /usr/local/bin/scripts/cp /usr/local/bin/scripts/master_ip_failover /usr/local/binvim /usr/local/bin/master_ip_failover###删除所有后；拷贝前输入 :set paste 解决vim粘贴乱序问题#!/usr/bin/env perluse strict;use warnings FATAL => 'all';use Getopt::Long;my ($command, $ssh_user, $orig_master_host, $orig_master_ip,$orig_master_port, $new_master_host, $new_master_ip, $new_master_port);my $vip = '10.190.33.100';my $brdc = '10.190.33.255';my $ifdev = 'ens33'; ##看下自己网卡是ens33则不用动，不是ens33就换成自己网卡名my $key = '1';my $ssh_start_vip = "/sbin/ifconfig ens33:$key $vip";my $ssh_stop_vip = "/sbin/ifconfig ens33:$key down";my $exit_code = 0;#my $ssh_start_vip = "/usr/sbin/ip addr add $vip/24 brd $brdc dev $ifdev label $ifdev:$key;/usr/sbin/arping -q -A -c 1 -I $ifdev $vip;iptables -F;";#my $ssh_stop_vip = "/usr/sbin/ip addr del $vip/24 dev $ifdev label $ifdev:$key";GetOptions('command=s' => \$command,'ssh_user=s' => \$ssh_user,'orig_master_host=s' => \$orig_master_host,'orig_master_ip=s' => \$orig_master_ip,'orig_master_port=i' => \$orig_master_port,'new_master_host=s' => \$new_master_host,'new_master_ip=s' => \$new_master_ip,'new_master_port=i' => \$new_master_port,);exit &main();sub main {print "\n\nIN SCRIPT TEST====$ssh_stop_vip==$ssh_start_vip===\n\n";if ( $command eq "stop" || $command eq "stopssh" ) {my $exit_code = 1;eval {print "Disabling the VIP on old master: $orig_master_host \n";&stop_vip();$exit_code = 0;};if ($@) {warn "Got Error: $@\n";exit $exit_code;}exit $exit_code;}elsif ( $command eq "start" ) {my $exit_code = 10;eval {print "Enabling the VIP - $vip on the new master - $new_master_host \n";&start_vip();$exit_code = 0;};if ($@) {warn $@;exit $exit_code;}exit $exit_code;}elsif ( $command eq "status" ) {print "Checking the Status of the script.. OK \n";exit 0;}else {&usage();exit 1;}}sub start_vip() {`ssh $ssh_user\@$new_master_host \" $ssh_start_vip \"`;}## A simple system call that disable the VIP on the old_mastersub stop_vip() {`ssh $ssh_user\@$orig_master_host \" $ssh_stop_vip \"`;}sub usage {print"Usage: master_ip_failover --command=start|stop|stopssh|status --orig_master_host=host --orig_master_ip=ip --orig_master_port=port --new_master_host=host --new_master_ip=ip --new_master_port=port\n";}
管理 mysql 节点服务器
创建相关目录
所有的服务器(仅以Master服务器举例)
mkdir -p /opt/mysql-mha/mha-node
编写配置文件
mkdir -p /opt/mysql-mha/mha-managervim /opt/mysql-mha/mysql_mha.cnf[server default]manager_log=/opt/mysql-mha/manager.logmanager_workdir=/opt/mysql-mha/mha-managerremote_workdir=/opt/mysql-mha/mha-nodemaster_binlog_dir=/usr/local/mysql/dataping_interval=1master_ip_failover_script=/usr/local/bin/master_ip_failovermaster_ip_online_change_script=/usr/local/bin/master_ip_online_changeuser=managerpassword=Admin@123repl_user=myslaverepl_password=Admin@123port=3306secondary_check_script=/usr/local/bin/masterha_secondary_check -s 10.190.33.72 -s 10.190.33.73shutdown_script=""ssh_user=root[server1]hostname=10.190.33.71port=3306[server2]candidate_master=1check_repl_delay=0hostname=10.190.33.72port=3306[server3]hostname=10.190.33.73port=3306
手动开启虚拟IP
Master服务器
/sbin/ifconfig ens33:1 10.190.33.100/24ifconfig
测试 ssh 无密码认证及 MySQL主从连接情况
masterha_check_ssh -conf=/opt/mysql-mha/mysql_mha.cnf#测试 ssh 无密码认证masterha_check_repl -conf=/opt/mysql-mha/mysql_mha.cnf#MySQL主从连接情况
启动 MHA
nohup masterha_manager \
--conf=/opt/mysql-mha/mysql_mha.cnf \
--remove_dead_master_conf \
--ignore_last_failover < /dev/null > /var/log/mha_manager.log 2>&1 &masterha_check_status --conf=/opt/mysql-mha/mysql_mha.cnf#查看 MHA 状态cat /opt/mysql-mha/manager.log | grep "current master"#查看 MHA 日志
故障模拟———— Master 节点意外故障
停止 Master 节点MySQL服务
systemctl stop mysqld
查看 mysql2 是否接管 VIP
ifconfig
修复故障
启动原来的主节点
systemctl start mysqld
修复数据
现主MySQL服务器（原从MySQL服务器1）
mysql -u root -pmysql> show master status;
在原来的主节点
change master to master_host='10.190.33.72',master_user='myslave',master_password='Admin@123',master_log_file='mysql-bin.000001',master_log_pos=1777;start slave;
在 manager 节点上修改配置文件
vim /opt/mysql-mha/mysql_mha.cnf······[server1]hostname= 10.190.33.71port=3306······
对mysql1和mysql2 进行重启
systemctl restart mysqld在 manager 节点上启动 MHA
masterha_stop --conf=/opt/mysql-mha/mysql_mha.cnfnohup masterha_manager \
--conf=/opt/mysql-mha/mysql_mha.cnf \
--remove_dead_master_conf \
--ignore_last_failover < /dev/null > /var/log/mha_manager.log 2>&1 &
