MHA的搭建

2024-09-12 20:30:05

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MHA的搭建：

　　1，環境準備：

　　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
　　主從：

　　在主上（10.99.121.206）創建復制用戶與監控用戶

　　GRANT REPLICATION SLAVE ON *.* TO 'repluser'@'%' IDENTIFIED BY '123qwe';
　　grant all privileges on *.* to 'monitor'@'%' identified by '123qwe';
　　在從上（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上安裝perl依賴、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
　　安裝完成后會在/usr/local/bin目錄下生成以下腳本文件:

　　apply_diff_relay_logs       //識別差異的中繼日志事件并將其差異的事件應用于其他的slave

　　filter_mysqlbinlog          //去除不必要的ROLLBACK事件（MHA已不再使用這個工具）

　　purge_relay_logs            //清除中繼日志（不會阻塞SQL線程）

　　save_binary_logs            //保存和復制master的二進制日志

　　3,安裝MHA Manager,在MHA Manager的主機也是需要安裝MHA Node,MHA Manger也依賴于perl模塊

　　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登錄無密碼驗證

　　所有服務器上生成：

　　ssh-keygen -t rsa
　　登陸10.99.121.206：

　　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
　　登陸10.99.121.209

　　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
　　登陸10.99.121.210

　　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
　　登陸10.99.121.213

　　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(登陸10.99.121.206)

　?。?）創建MHA的工作目錄，并且創建相關配置文件（在軟件包解壓后的目錄里面有樣例配置文件）

　　mkdir -p /etc/masterha
　　cp mha4mysql-manager-0.56/samples/conf/app1.cnf /etc/masterha/
　　修改app1.cnf配置文件，修改后的文件內容如下

　　[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)設置relay log的清除方式（在每個slave節點上）

　　mysql -uroot -pLenovo123#@! -e "set global relay_log_purge=0"
　　mysql -uroot -pLenovo123#@! -e "set global relay_log_purge=0"
　　6,檢查SSH配置(10.99.121.206 Monitor 監控節點上操作)，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,檢查整個復制環境狀況(10.99.121.206 Monitor 監控節點上操作)，如下

　　masterha_check_repl --conf=/etc/masterha/app1.cnf
　　如果遇到如下錯誤：

　　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數據庫上執行：

　　ln -s /usr/local/mysql/bin/mysqlbinlog /usr/local/bin/mysqlbinlog
　　ln -s /usr/local/mysql/bin/mysql /usr/local/bin/mysql
　　8,開啟MHA Manager監控(10.99.121.206 Monitor 監控節點上操作)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
　　最后會在admin/daemontools-0.76先建立command目錄并存放相關命令，有什么命令我們可以這樣查看：

　　[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
　　同時在/usr/local/bin下對上面這些命令建立了軟連接方便我們執行

　　另外創建監控/services目錄，并在/etc/inittab下也有變化：

　　SV:123456:respawn:/command/svscanboot
　　它使用init的方式來守護自己

　　[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
　　##啟動monitoring
　　svc -u /service/masterha_app1
　　##停止monitoring
　　svc -d /service/masterha_app1
　　在此我們先不使用這種方式啟動。

（編輯：武林網）

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