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MHA的搭建

2024-09-12 20:30:05
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       MHA的搭建:

  1,环境准备:
 
  DB:mysql-5.7.16
 
  MHA:mha4mysql-manager-0.56.tar.gz、mha4mysql-node-0.56.tar.gz、daemontools-0.76.tar.gz
 
  role       ip
  monitor    10.99.121.206
  master     10.99.121.209
  slave      10.99.121.210
  slave      10.99.121.213
  主从:
 
  在主上(10.99.121.206)创建复制用户与监控用户
 
  GRANT REPLICATION SLAVE ON *.* TO 'repluser'@'%' IDENTIFIED BY '123qwe';
  grant all privileges on *.* to 'monitor'@'%' identified by '123qwe';
  在从上(10.99.121.210、10.99.121.213)配置
 
  change master to
  master_host='10.99.121.209',
  master_port=3306,
  master_user='repluser',
  master_password='123qwe',
  master_log_file='binlog.000002',
  master_log_pos=1009;
 
  set global read_only=on;
  2,在所有的node上安装perl依赖、mha-node
 
  master slave install epel and perl-DBD-MySQL
  rpm -ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
  yum install perl-DBD-MySQL -y
  yum install -y perl-devel
  yum install -y perl-CPAN
 
  master slave install MHA node
  tar xf mha4mysql-node-0.56.tar.gz
  cd mha4mysql-node-0.56
  perl Makefile.PL
  make && make install
  安装完成后会在/usr/local/bin目录下生成以下脚本文件:
 
  apply_diff_relay_logs       //识别差异的中继日志事件并将其差异的事件应用于其他的slave
 
  filter_mysqlbinlog          //去除不必要的ROLLBACK事件(MHA已不再使用这个工具)
 
  purge_relay_logs            //清除中继日志(不会阻塞SQL线程)
 
  save_binary_logs            //保存和复制master的二进制日志
 
  3,安装MHA Manager,在MHA Manager的主机也是需要安装MHA Node,MHA Manger也依赖于perl模块
 
  rpm -ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
  yum install perl-DBD-MySQL -y
  yum install -y perl-devel perl-CPAN
  yum install perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager perl-Time-HiRes -y
 
  tar xf mha4mysql-node-0.56.tar.gz
  cd mha4mysql-node-0.56
  perl Makefile.PL
  make && make install
 
  tar xf mha4mysql-manager-0.56.tar.gz
  cd mha4mysql-manager-0.56
  perl Makefile.PL
  make && make install
 
  cd /apps/mha4mysql-manager-0.56/samples/scripts
  cp * /usr/local/bin/
  4,配置SSH登录无密码验证
 
  所有服务器上生成:
 
  ssh-keygen -t rsa
  登陆10.99.121.206:
 
  ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.99.121.209
  ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.99.121.210
  ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.99.121.213
  登陆10.99.121.209
 
  ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.99.121.210
  ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.99.121.213
  登陆10.99.121.210
 
  ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.99.121.209
  ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.99.121.213
  登陆10.99.121.213
 
  ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.99.121.209
  ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.99.121.210
  5,配置MHA(登陆10.99.121.206)
 
  (1)创建MHA的工作目录,并且创建相关配置文件(在软件包解压后的目录里面有样例配置文件)
 
  mkdir -p /etc/masterha
  cp mha4mysql-manager-0.56/samples/conf/app1.cnf /etc/masterha/
  修改app1.cnf配置文件,修改后的文件内容如下
 
  [server default]
  manager_workdir=/var/log/masterha/app1
  manager_log=/var/log/masterha/app1/manager.log
  master_binlog_dir=/data/mysql/mysql_data
  master_ip_failover_script= /usr/local/bin/master_ip_failover
  ster_ip_online_change_script= /usr/local/bin/master_ip_online_change
  password=123qwe
  user=monitor
  ping_interval=1
  remote_workdir=/tmp
  repl_password=123qwe
  repl_user=repluser
  report_script=/usr/local/bin/send_report
  secondary_check_script= /usr/local/bin/masterha_secondary_check -s lenovo2 -s lenovo1 --user=repluser --master_host=lenovo1 --master_ip=10.99.121.209 --master_port=3306
  shutdown_script=""
  ssh_user=root
 
  [server1]
  hostname=10.99.121.209
  port=3306
 
  [server2]
  hostname=10.99.121.210
  port=3306
  candidate_master=1
  check_repl_delay=0
 
  [server3]
  hostname=10.99.121.213
  port=3306
  (2)设置relay log的清除方式(在每个slave节点上)
 
  mysql -uroot -pLenovo123#@! -e "set global relay_log_purge=0"
  mysql -uroot -pLenovo123#@! -e "set global relay_log_purge=0"
  6,检查SSH配置(10.99.121.206 Monitor 监控节点上操作),如下
 
  [root@lenovo16 masterha]# masterha_check_ssh --conf=/etc/masterha/app1.cnf
  Thu May 25 16:55:19 2017 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
  Thu May 25 16:55:19 2017 - [info] Reading application default configuration from /etc/masterha/app1.cnf..
  Thu May 25 16:55:19 2017 - [info] Reading server configuration from /etc/masterha/app1.cnf..
  Thu May 25 16:55:19 2017 - [info] Starting SSH connection tests..
  Thu May 25 16:55:20 2017 - [debug]
  Thu May 25 16:55:19 2017 - [debug]  Connecting via SSH from root@10.99.121.210(10.99.121.210:22) to root@10.99.121.209(10.99.121.209:22)..
  Thu May 25 16:55:20 2017 - [debug]   ok.
  Thu May 25 16:55:20 2017 - [debug]  Connecting via SSH from root@10.99.121.210(10.99.121.210:22) to root@10.99.121.213(10.99.121.213:22)..
  Thu May 25 16:55:20 2017 - [debug]   ok.
  Thu May 25 16:55:20 2017 - [debug]
  Thu May 25 16:55:19 2017 - [debug]  Connecting via SSH from root@10.99.121.209(10.99.121.209:22) to root@10.99.121.210(10.99.121.210:22)..
  Thu May 25 16:55:19 2017 - [debug]   ok.
  Thu May 25 16:55:19 2017 - [debug]  Connecting via SSH from root@10.99.121.209(10.99.121.209:22) to root@10.99.121.213(10.99.121.213:22)..
  Thu May 25 16:55:20 2017 - [debug]   ok.
  Thu May 25 16:55:21 2017 - [debug]
  Thu May 25 16:55:20 2017 - [debug]  Connecting via SSH from root@10.99.121.213(10.99.121.213:22) to root@10.99.121.209(10.99.121.209:22)..
  Thu May 25 16:55:20 2017 - [debug]   ok.
  Thu May 25 16:55:20 2017 - [debug]  Connecting via SSH from root@10.99.121.213(10.99.121.213:22) to root@10.99.121.210(10.99.121.210:22)..
  Thu May 25 16:55:21 2017 - [debug]   ok.
  Thu May 25 16:55:21 2017 - [info] All SSH connection tests passed successfully.
  7,检查整个复制环境状况(10.99.121.206 Monitor 监控节点上操作),如下
 
  masterha_check_repl --conf=/etc/masterha/app1.cnf
  如果遇到如下错误:
 
  Thu May 25 16:58:30 2017 - [info]   Connecting to root@10.99.121.210(10.99.121.210:22)..
  Can't exec "mysqlbinlog": No such file or directory at /usr/local/share/perl5/MHA/BinlogManager.pm line 106.
  mysqlbinlog version command failed with rc 1:0, please verify PATH, LD_LIBRARY_PATH, and client options
   at /usr/local/bin/apply_diff_relay_logs line 493
  那在所有mysql数据库上执行:
 
  ln -s /usr/local/mysql/bin/mysqlbinlog /usr/local/bin/mysqlbinlog
  ln -s /usr/local/mysql/bin/mysql /usr/local/bin/mysql
  8,开启MHA Manager监控(10.99.121.206 Monitor 监控节点上操作)如下
 
  [root@lenovo16 apps]# masterha_check_status --conf=/etc/masterha/app1.cnf
  app1 is stopped(2:NOT_RUNNING).
  [root@lenovo16 apps]# nohup masterha_manager --conf=/etc/masterha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/masterha/app1/manager.log 2>&1 &
  [1] 18587
  [root@lenovo16 apps]# masterha_check_status --conf=/etc/masterha/app1.cnf
  app1 monitoring program is now on initialization phase(10:INITIALIZING_MONITOR). Wait for a while and try checking again.
  [root@lenovo16 apps]# masterha_check_status --conf=/etc/masterha/app1.cnf
  app1 (pid:18587) is running(0:PING_OK), master:10.99.121.209
  wget http://cr.yp.to/daemontools/daemontools-0.76.tar.gz
  tar -zxvf daemontools-0.76.tar.gz
  cd admin/daemontools-0.76/
  package/install
  在src/conf-cc最后加上-include /usr/include/errno.h
 
  [root@lenovo16 apps]# package/install
  最后会在admin/daemontools-0.76先建立command目录并存放相关命令,有什么命令我们可以这样查看:
 
  [root@lenovo16 apps]# ls /apps/admin/daemontools-0.76/command
  envdir     fghack    pgrphack       setlock    softlimit  svc   svscan      svstat  tai64nlocal
  envuidgid  multilog  readproctitle  setuidgid  supervise  svok  svscanboot  tai64n
  同时在/usr/local/bin下对上面这些命令建立了软连接方便我们执行
 
  另外创建监控/services目录,并在/etc/inittab下也有变化:
 
  SV:123456:respawn:/command/svscanboot
  它使用init的方式来守护自己
 
  [root@lenovo16 apps]# mkdir -p /service/masterha_app1
  [root@lenovo16 apps]# vim /service/masterha_app1/run
  #!bin/bash
  exec masterha_manager --conf=/etc/mha/app1.cnf --wait_on_monitor_error=60 --wait_on_failover_error=60 >> /var/log/masterha/app1/app1.log 2>&1
  [root@lenovo16 apps]#chmod 755 /service/masterha_app1/run
  ##启动monitoring
  svc -u /service/masterha_app1
  ##停止monitoring
  svc -d /service/masterha_app1
  在此我们先不使用这种方式启动。

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