怎么创建MHA+MySQL
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这篇文章主要介绍“怎么搭建MHA+MySQL”，在日常操作中，相信很多人在怎么搭建MHA+MySQL问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”怎么搭建MHA+MySQL”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！ 一主两从，manager节点为vm3 master：10.0.0.2 vm1 node slave1: 10.0.0.3 vm2 node slave2: 10.0.0.4 vm3 manager
OS verision均为：CentOS release 6.5
1，从https://code.google.com/p/mysql-master-ha/wiki/Downloads?tm=2下载MHA安装包 mha4mysql-node-0.56-0.el6.noarch.rpm mha4mysql-manager-0.56-0.el6.noarch.rpm
node需要安装mha4mysql-node-0.56-0.el6.noarch.rpm包， manager节点需要安装mha4mysql-manager-0.56-0.el6.noarch.rpm和mha4mysql-node-0.56-0.el6.noarch.rpm 或者从https://github.com/yoshinorim下载源码包 2 给所有节点配置EPEL yum源。 rpm -ivh http://mirrors.opencas.cn/epel/6/i386/epel-release-6-8.noarch.rpm
yum clean all; yum makecache
3 为所有节点安装mha4mysql-node-0.56-0.el6.noarch.rpm yum -y install perl-DBD-MySQL ncftp rpm -ivh mha4mysql-node-0.56-0.el6.noarch.rpm
4 为manager节点安装mha4mysql-manager-0.56-0.el6.noarch.rpm yum -y install perl-Config-Tiny perl-Params-Validate perl-Log-Dispatch perl-Parallel-ForkManager rpm -ivh mha4mysql-manager-0.56-0.el6.noarch.rpm
5 配置各节点间的ssh公钥信任，实现免密钥登录。（manager to node, node to node） vm1: ssh-keygen -t rsa ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.0.0.3 ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.0.0.4 vm2: ssh-keygen -t rsa ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.0.0.2 ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.0.0.4 vm3: ssh-keygen -t rsa ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.0.0.2 ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.0.0.3
分别从各个节点ssh登陆其他节点。（必须做，头一次需要输入yes确认）
6 在各mysql节点创建MHA的监控用户 grant all privileges on *.* to 'mha_monitor'@'10.0.0.%' identified by '123456'; mysql> select user,host from user; +-------------+-----------+ | user | host | +-------------+-----------+ | mha_monitor | 10.0.0.% | | repl | 10.0.0.% |
7 配置mha conf文件 mkdir /etc/masterha mkdir -p /masterha/app1
配置文件app1.cnf内容如下 cat /etc/masterha/app1.cnf [server default] manager_workdir=/masterha/app1 manager_log=/masterha/app1/manager.log ssh_user=root ##OS ssh登陆用户
user=mha_monitor ##mha登陆mysql主从的用户 password=123456 ##mha登陆mysql主从的用户密码
repl_user=repl ##主从复制用户 repl_password=p4ssw0rd ##主从复制用户的密码
ping_interval=1 shutdown_script="" #master_ip_failover_script="/usr/local/bin/master_ip_failover" master_ip_online_change_script="" report_script=""
[server1] hostname=10.0.0.2 master_binlog_dir="/data/mysql3306" port=3306 candidate_master=1
[server2] hostname=10.0.0.3 master_binlog_dir="/data/mysql3306" port=3306 candidate_master=1
[server3] hostname=10.0.0.4 master_binlog_dir="/data/mysql3306" port=3306 no_master=1
8 启动 nohup masterha_manager --conf=/etc/masterha/app1.cnf > /tmp/mha_manager.log < /dev/null 2>&1 & shutdown 掉master后，可以顺利切换。
但是masterha_check_ssh会报错，只是不影响功能： [root@vm3 ~]# masterha_check_ssh --conf=/etc/masterha/app1.cnf Wed Apr 6 15:56:05 2016 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Wed Apr 6 15:56:05 2016 - [info] Reading application default configuration from /etc/masterha/app1.cnf.. Wed Apr 6 15:56:05 2016 - [info] Reading server configuration from /etc/masterha/app1.cnf.. Wed Apr 6 15:56:05 2016 - [info] Starting SSH connection tests.. Wed Apr 6 15:56:05 2016 - [debug] Wed Apr 6 15:56:05 2016 - [debug] Connecting via SSH from root@vm1(10.0.0.2:22) to root@vm2(10.0.0.3:22).. Wed Apr 6 15:56:05 2016 - [debug] ok. Wed Apr 6 15:56:05 2016 - [debug] Connecting via SSH from root@vm1(10.0.0.2:22) to root@10.0.0.4(10.0.0.4:22).. Wed Apr 6 15:56:05 2016 - [debug] ok. Wed Apr 6 15:56:06 2016 - [debug] Wed Apr 6 15:56:05 2016 - [debug] Connecting via SSH from root@vm2(10.0.0.3:22) to root@vm1(10.0.0.2:22).. Wed Apr 6 15:56:06 2016 - [debug] ok. Wed Apr 6 15:56:06 2016 - [debug] Connecting via SSH from root@vm2(10.0.0.3:22) to root@10.0.0.4(10.0.0.4:22).. Wed Apr 6 15:56:06 2016 - [debug] ok. Wed Apr 6 15:56:06 2016 - [error][/usr/share/perl5/vendor_perl/MHA/SSHCheck.pm, ln63] Wed Apr 6 15:56:06 2016 - [debug] Connecting via SSH from root@10.0.0.4(10.0.0.4:22) to root@vm1(10.0.0.2:22).. Warning: Permanently added '10.0.0.4' (RSA) to the list of known hosts. Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password). Wed Apr 6 15:56:06 2016 - [error][/usr/share/perl5/vendor_perl/MHA/SSHCheck.pm, ln111] SSH connection from root@10.0.0.4(10.0.0.4:22) to root@vm1(10.0.0.2:22) failed! SSH Configuration Check Failed! at /usr/bin/masterha_check_ssh line 44中间 9 最后shutdown掉master，模拟failover: ----- Failover Report ----- app1: MySQL Master failover vm1(10.0.0.2:3306) to vm2(10.0.0.3:3306) succeeded Master vm1(10.0.0.2:3306) is down! Check MHA Manager logs at vm3:/masterha/app1/manager.log for details. Started automated(non-interactive) failover. Selected vm2(10.0.0.3:3306) as a new master. vm2(10.0.0.3:3306): OK: Applying all logs succeeded. 10.0.0.4(10.0.0.4:3306): OK: Slave started, replicating from vm2(10.0.0.3:3306) vm2(10.0.0.3:3306): Resetting slave info succeeded. 主从切换成功。 ########################################## ########################################## 关于masterha_check_ssh报错的问题，MHA官网上发现类似问题的帖子有人给的解释如下： #3 dba.abde...@gmail.com As mentioned here in the tutorial: https://code.google.com/p/mysql-master-ha/wiki/Tutorial You shouldn't add an entry for the manager host. If you have 4 hosts, 1, 2, 3 and 4 (manager), you should add host entries for the first 3 ones only (1, 2 & 3) then it should work without any problems. 他的结构是： master:10.10.105.9 slave1:10.10.105.10 slave2:10.10.105.11 slave3+mha_manage:10.10.105.12 和我的结构类似。 （编辑：银川站长网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
