介绍:
MHA架构至少需要3台服务器.两台Master.其中一台位主master,另外一台为备master,第三台位slave机器.
MHA两部分构成.MHA manager和MHA data.管理节点和数据节点.
MAH在自动故障切换的过程中,MHA试图从的宕机的主服务器上保存二进制日志,最大程度的保证数据不丢失.但是数据肯定会丢失的.(主服务器硬件故障/无法通过ssh访问)
MHA的切换过程
（1）从宕机崩溃的master保存二进制日志事件（binlog events）; （2）识别含有最新更新的slave； （3）应用差异的中继日志（relay log）到其他的slave； （4）应用从master保存的二进制日志事件（binlog events）； （5）提升一个slave为新的master； （6）使其他的slave连接新的master进行复制；
一:准备规划机器配置:
我使用了5台服务器.虚拟环境.
192.168.0.221 manager 192.168.0.222 master1 192.168.0.223 master2 192.168.0.224 slave1 192.168.0.225 slave2
0.安装前执行脚本
#!/bin/bash service iptables stop chkconfig iptables off iptables -F sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/sysconfig/selinux yum install wget gcc gcc-c++ -y
1.配置hosts文件
cat >> /etc/hosts << EOF 192.168.0.221 manager 192.168.0.222 master1 192.168.0.223 master2 192.168.0.224 slave1 192.168.0.225 slave2 EOF
[root@manager ~]# scp -o StrictHostKeyChecking=no /etc/hosts root@master1:/etc/ [root@manager ~]# scp -o StrictHostKeyChecking=no /etc/hosts root@master2:/etc/ [root@manager ~]# scp -o StrictHostKeyChecking=no /etc/hosts root@slave1:/etc/ [root@manager ~]# scp -o StrictHostKeyChecking=no /etc/hosts root@slave2:/etc/
2.ssh无密码登陆
主机:manager
ssh-keygen -t rsa ssh-copy-id -i ~/.ssh/id_rsa.pub root@master1 ssh-copy-id -i ~/.ssh/id_rsa.pub root@master2 ssh-copy-id -i ~/.ssh/id_rsa.pub root@slave1 ssh-copy-id -i ~/.ssh/id_rsa.pub root@slave2
主机:master1
ssh-keygen -t rsa ssh-copy-id -i ~/.ssh/id_rsa.pub root@manager ssh-copy-id -i ~/.ssh/id_rsa.pub root@master2 ssh-copy-id -i ~/.ssh/id_rsa.pub root@slave1 ssh-copy-id -i ~/.ssh/id_rsa.pub root@slave2
主机:master2
ssh-keygen -t rsa ssh-copy-id -i ~/.ssh/id_rsa.pub root@manager ssh-copy-id -i ~/.ssh/id_rsa.pub root@master1 ssh-copy-id -i ~/.ssh/id_rsa.pub root@slave1 ssh-copy-id -i ~/.ssh/id_rsa.pub root@slave2
主机:slave1
ssh-keygen -t rsa ssh-copy-id -i ~/.ssh/id_rsa.pub root@manager ssh-copy-id -i ~/.ssh/id_rsa.pub root@master1 ssh-copy-id -i ~/.ssh/id_rsa.pub root@master2 ssh-copy-id -i ~/.ssh/id_rsa.pub root@slave2
主机:slave2
ssh-keygen -t rsa ssh-copy-id -i ~/.ssh/id_rsa.pub root@manager ssh-copy-id -i ~/.ssh/id_rsa.pub root@master1 ssh-copy-id -i ~/.ssh/id_rsa.pub root@master2 ssh-copy-id -i ~/.ssh/id_rsa.pub root@slave1
二:规划mysql数据库
1.在master1、master2和slave1和slave2上安装mysql服务
http://yujianglei.blog.51cto.com/7215578/1725585
更改密码: mysqladmin -uroot password '123'
2.配置master1、master2、slave1和slave2之间的主从复制
主机:master1
[root@master1 ~]# egrep "log-bin|server-id" /etc/my.cnf log-bin=/mydata/bin_log/mysql-bin server-id=221
主机:master2
[root@master2 ~]# egrep "log-bin|server-id" /etc/my.cnf log-bin=/mydata/bin_log/mysql-bin server-id=222
主机:slave1
[root@slave1 ~]# egrep "log-bin|server-id" /etc/my.cnf log-bin=/mydata/bin_log/mysql-bin server-id=224
主机:slave2
[root@slave2 ~]# egrep "log-bin|server-id" /etc/my.cnf log-bin=/mydata/bin_log/mysql-bin server-id=225
3.在master1、master2上创建主从同步的账号。master2是备用master，这个也需要建立授权用户
[root@master1 ~]# mysql -uroot -p123 -e "grant all privileges on *.* to 'rep'@'192.168.0.%' identified by 'rep123';flush privileges" [root@master2 ~]# mysql -uroot -p123 -e "grant all privileges on *.* to 'rep'@'192.168.0.%' identified by 'rep123';flush privileges"
mysql -uroot -p123 -e "select User,Host,Password from mysql.user"
4、在master1上执行命令，查看master状态信息
[root@master1 ~]# mysql -uroot -p123 -e "show master status" Warning: Using a password on the command line interface can be insecure. +------------------+----------+--------------+------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +------------------+----------+--------------+------------------+-------------------+ | mysql-bin.000001 | 545 | | | | +------------------+----------+--------------+------------------+-------------------+
5、在master2、slave1、slave2上执行主从同步
在master1上执行命令:
mysql> CHANGE MASTER TO -> MASTER_HOST='192.168.0.222', -> MASTER_USER='rep', -> MASTER_PASSWORD='rep123', -> MASTER_PORT=3306, -> MASTER_LOG_FILE='mysql-bin.000001', -> MASTER_LOG_POS=545; Query OK, 0 rows affected, 2 warnings (0.01 sec)
mysql> start slave; Query OK, 0 rows affected (0.01 sec)
mysql> show slave status\G; *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.0.222 Master_User: rep Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000001 Read_Master_Log_Pos: 545 Relay_Log_File: master2-relay-bin.000002 Relay_Log_Pos: 283 Relay_Master_Log_File: mysql-bin.000001 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 545 Relay_Log_Space: 458 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: 0 Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 221 Master_UUID: 5dea20fa-942d-11e5-93c3-001c42ccc5ea Master_Info_File: /mydata/data/master.info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: Executed_Gtid_Set: Auto_Position: 0 1 row in set (0.00 sec) ERROR: No query specified
在slave1上执行命令:
mysql> CHANGE MASTER TO -> MASTER_HOST='192.168.0.222', -> MASTER_USER='rep', -> MASTER_PASSWORD='rep123', -> MASTER_PORT=3306, -> MASTER_LOG_FILE='mysql-bin.000001', -> MASTER_LOG_POS=545; Query OK, 0 rows affected, 2 warnings (0.02 sec)
mysql> start slave; Query OK, 0 rows affected (0.01 sec)
mysql> show slave status\G; *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.0.222 Master_User: rep Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000001 Read_Master_Log_Pos: 545 Relay_Log_File: slave1-relay-bin.000002 Relay_Log_Pos: 283 Relay_Master_Log_File: mysql-bin.000001 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 545 Relay_Log_Space: 457 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: 0 Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 221 Master_UUID: 5dea20fa-942d-11e5-93c3-001c42ccc5ea Master_Info_File: /mydata/data/master.info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: Executed_Gtid_Set: Auto_Position: 0 1 row in set (0.00 sec) ERROR: No query specified
在slave2上执行命令:
mysql> CHANGE MASTER TO -> MASTER_HOST='192.168.0.222', -> MASTER_USER='rep', -> MASTER_PASSWORD='rep123', -> MASTER_PORT=3306, -> MASTER_LOG_FILE='mysql-bin.000001', -> MASTER_LOG_POS=545; Query OK, 0 rows affected, 2 warnings (0.02 sec)
mysql> start slave; Query OK, 0 rows affected (0.01 sec)
mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.0.222 Master_User: rep Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000001 Read_Master_Log_Pos: 545 Relay_Log_File: slave2-relay-bin.000002 Relay_Log_Pos: 283 Relay_Master_Log_File: mysql-bin.000001 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 545 Relay_Log_Space: 457 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: 0 Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 221 Master_UUID: 5dea20fa-942d-11e5-93c3-001c42ccc5ea Master_Info_File: /mydata/data/master.info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: Executed_Gtid_Set: Auto_Position: 0 1 row in set (0.00 sec)
三:规划MHA
1、创建mha管理用的复制账号，每台数据库上都要创建5个账号，在这里以其中master1为例
[root@master ~]# mysql -uroot -p123 mysql> grant all privileges on *.* to 'mha_rep'@'192.168.0.221' identified by 'mha123'; mysql> grant all privileges on *.* to 'mha_rep'@'192.168.0.222' identified by 'mha123'; mysql> grant all privileges on *.* to 'mha_rep'@'192.168.0.223' identified by 'mha123'; mysql> grant all privileges on *.* to 'mha_rep'@'192.168.0.224' identified by 'mha123'; mysql> grant all privileges on *.* to 'mha_rep'@'192.168.0.225' identified by 'mha123'; mysql> flush privileges;
mysql> select user,host,password from mysql.user where user='mha_rep'; +---------+---------------+-------------------------------------------+ | user | host | password | +---------+---------------+-------------------------------------------+ | mha_rep | 192.168.0.221 | *7D80375C32408CA76BB965C11657023AABF22F0A | | mha_rep | 192.168.0.222 | *7D80375C32408CA76BB965C11657023AABF22F0A | | mha_rep | 192.168.0.223 | *7D80375C32408CA76BB965C11657023AABF22F0A | | mha_rep | 192.168.0.224 | *7D80375C32408CA76BB965C11657023AABF22F0A | +---------+---------------+-------------------------------------------+ 4 rows in set (0.00 sec)
2、在4台主机上(master、slave01和slave02)上分别安装mha4mysql-node包，这里以master为例，其它主机同理。manager和node都安装
[root@master1 ~]# rpm -ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm [root@master1 ~]# yum clean all [root@master1 ~]# yum makecache [root@master1 ~]# rpm –import /etc/pki/rpm-gpg/* [root@master1 ~]# yum install perl perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager perl-Config-IniFiles ncftp perl-Params-Validate perl-CPAN perl-Test-Mock-LWP.noarch perl-LWP-Authen-Negotiate.noarch perl-devel perl-ExtUtils-CBuilder perl-ExtUtils-MakeMaker [root@master1 ~]# yum install perl-Time-HiRes -y [root@master1 ~]# wget https://downloads.mariadb.com/files/MHA/mha4mysql-node-0.54-0.el6.noarch.rpm [root@master1 ~]# rpm -ivh mha4mysql-node-0.54-0.el6.noarch.rpm
3.在manager上安装mha4mysql-manager和mha4mysql-node包
[root@master1 ~]# yum install perl perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager perl-Config-IniFiles ncftp perl-Params-Validate perl-CPAN perl-Test-Mock-LWP.noarch perl-LWP-Authen-Negotiate.noarch perl-devel perl-ExtUtils-CBuilder perl-ExtUtils-MakeMaker [root@master1 ~]# yum install perl-Time-HiRes -y [root@manager ~]# yum install perl cpan perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager perl-Net-Telnet -y [root@manager ~]# wget http://rpmfind.net/linux/dag/redhat/el6/en/x86_64/dag/RPMS/perl-Log-Dispatch-2.26-1.el6.rf.noarch.rpm [root@manager ~]# wget ftp://rpmfind.net/linux/dag/redhat/el6/en/x86_64/dag/RPMS/perl-Parallel-ForkManager-0.7.5-2.2.el6.rf.noarch.rpm [root@manager ~]# wget ftp://rpmfind.net/linux/dag/redhat/el6/en/x86_64/dag/RPMS/perl-Mail-Sender-0.8.16-1.el6.rf.noarch.rpm [root@manager ~]# wget ftp://rpmfind.net/linux/dag/redhat/el6/en/x86_64/dag/RPMS/perl-Mail-Sendmail-0.79-1.2.el6.rf.noarch.rpm [root@manager ~]# yum localinstall *.rpm -y
安装manager和node包
wget https://downloads.mariadb.com/files/MHA/mha4mysql-manager-0.55-0.el6.noarch.rpm rpm -ivh https://downloads.mariadb.com/files/MHA/mha4mysql-manager-0.55-0.el6.noarch.rpm
4、查看mha4mysql-manager安装了哪些工具
[root@manager tools]# rpm -ql mha4mysql-manager |grep bin /usr/bin/masterha_check_repl /usr/bin/masterha_check_ssh /usr/bin/masterha_check_status /usr/bin/masterha_conf_host /usr/bin/masterha_manager /usr/bin/masterha_master_monitor /usr/bin/masterha_master_switch /usr/bin/masterha_secondary_check /usr/bin/masterha_stop
5、manager主机上下载mha4mysql-manager的源码包
[root@manager ~]# wget https://downloads.mariadb.com/files/MHA/mha4mysql-manager-0.56.tar.gz [root@manager ~]# mkdir -p /usr/local/mha/scripts [root@manager ~]# cp mha4mysql-manager-0.56/samples/scripts/* /usr/local/mha/scripts/ [root@manager ~]# cp mha4mysql-manager-0.56/samples/conf/app1.cnf /usr/local/mha/mha.cnf [root@manager ~]# tree /usr/local/mha/
6.修改manager端mha的配置文件，如下
[server default] user=mha_rep password=123456 ssh_user=root repl_user=rep repl_password=rep123 ping_interval=1 manager_workdir=/usr/local/mha manager_log=/usr/local/mha/manager.log secondary_check_script= masterha_secondary_check -s 192.168.0.223 -s 192.168.0.224 -s 192.168.0.255 master_ip_failover_script=/usr/local/mha/scripts/master_ip_failover #report_script= /usr/local/mha/scripts/send_report #master_ip_online_change_script= /usr/local/mha/scripts/master_ip_online_change #shutdown_script= /usr/local/mha/scripts/power_manager [server1] hostname=master1 ssh_port=22 candidate_master=1 master_binlog_dir=/mydata/bin_log/ [server2] hostname=master2 ssh_port=22 candidate_master=1 master_binlog_dir=/mydata/bin_log/ [server3] hostname=slave1 ssh_port=22 no_master=1 master_binlog_dir=/mydata/bin_log/ [server4] hostname=slave2 ssh_port=22 no_master=1 master_binlog_dir=/mydata/bin_log/
编写master_ip_failover
mv /usr/local/mha/scripts/master_ip_failover /usr/local/mha/scripts/master_ip_failover.bak vi /usr/local/mha/scripts/master_ip_failover
#!/usr/bin/env perl
use 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 = '192.168.0.99'; # Virtual IP
my $gateway = '192.168.0.1';#Gateway IP
my $interface = 'eth0';
my $key = "1";
my $ssh_start_vip = "/sbin/ifconfig $interface:$key $vip;/sbin/arping -I $interface -c 3 -s $vip $gateway >/dev/null 2>&1";
my $ssh_stop_vip = "/sbin/ifconfig $interface:$key down";
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" ) {
# $orig_master_host, $orig_master_ip, $orig_master_port are passed.
# If you manage master ip address at global catalog database,
# invalidate orig_master_ip here.
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" ) {
# all arguments are passed.
# If you manage master ip address at global catalog database,
# activate new_master_ip here.
# You can also grant write access (create user, set read_only=0, etc) here.
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";
`ssh $ssh_user\@$orig_master_host \" $ssh_start_vip \"`;
exit 0;
}
else {
&usage();
exit 1;
}
}
# A simple system call that enable the VIP on the new master
sub start_vip() {
`ssh $ssh_user\@$new_master_host \" $ssh_start_vip \"`;
}
# A simple system call that disable the VIP on the old_master
sub 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";
}7.检查ssh服务是否正常
[root@manager mha]# masterha_check_ssh --conf=/usr/local/mha/mha.cnf Sat Nov 28 11:28:35 2015 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Sat Nov 28 11:28:35 2015 - [info] Reading application default configurations from /usr/local/mha/mha.cnf.. Sat Nov 28 11:28:35 2015 - [info] Reading server configurations from /usr/local/mha/mha.cnf.. Sat Nov 28 11:28:35 2015 - [info] Starting SSH connection tests.. Sat Nov 28 11:28:38 2015 - [debug] Sat Nov 28 11:28:35 2015 - [debug] Connecting via SSH from root@master1(192.168.0.222:22) to root@master2(192.168.0.223:22).. Sat Nov 28 11:28:36 2015 - [debug] ok. Sat Nov 28 11:28:36 2015 - [debug] Connecting via SSH from root@master1(192.168.0.222:22) to root@slave1(192.168.0.224:22).. Sat Nov 28 11:28:37 2015 - [debug] ok. Sat Nov 28 11:28:37 2015 - [debug] Connecting via SSH from root@master1(192.168.0.222:22) to root@slave2(192.168.0.225:22).. Sat Nov 28 11:28:38 2015 - [debug] ok. Sat Nov 28 11:28:39 2015 - [debug] Sat Nov 28 11:28:36 2015 - [debug] Connecting via SSH from root@master2(192.168.0.223:22) to root@master1(192.168.0.222:22).. Sat Nov 28 11:28:36 2015 - [debug] ok. Sat Nov 28 11:28:36 2015 - [debug] Connecting via SSH from root@master2(192.168.0.223:22) to root@slave1(192.168.0.224:22).. Sat Nov 28 11:28:38 2015 - [debug] ok. Sat Nov 28 11:28:38 2015 - [debug] Connecting via SSH from root@master2(192.168.0.223:22) to root@slave2(192.168.0.225:22).. Sat Nov 28 11:28:39 2015 - [debug] ok. Sat Nov 28 11:28:40 2015 - [debug] Sat Nov 28 11:28:36 2015 - [debug] Connecting via SSH from root@slave1(192.168.0.224:22) to root@master1(192.168.0.222:22).. Sat Nov 28 11:28:37 2015 - [debug] ok. Sat Nov 28 11:28:37 2015 - [debug] Connecting via SSH from root@slave1(192.168.0.224:22) to root@master2(192.168.0.223:22).. Sat Nov 28 11:28:39 2015 - [debug] ok. Sat Nov 28 11:28:39 2015 - [debug] Connecting via SSH from root@slave1(192.168.0.224:22) to root@slave2(192.168.0.225:22).. Sat Nov 28 11:28:40 2015 - [debug] ok. Sat Nov 28 11:28:40 2015 - [debug] Sat Nov 28 11:28:37 2015 - [debug] Connecting via SSH from root@slave2(192.168.0.225:22) to root@master1(192.168.0.222:22).. Sat Nov 28 11:28:38 2015 - [debug] ok. Sat Nov 28 11:28:38 2015 - [debug] Connecting via SSH from root@slave2(192.168.0.225:22) to root@master2(192.168.0.223:22).. Sat Nov 28 11:28:39 2015 - [debug] ok. Sat Nov 28 11:28:39 2015 - [debug] Connecting via SSH from root@slave2(192.168.0.225:22) to root@slave1(192.168.0.224:22).. Sat Nov 28 11:28:40 2015 - [debug] ok. Sat Nov 28 11:28:40 2015 - [info] All SSH connection tests passed successfully.
如果得到以上结果，表明主机之间ssh互信是畅通的
8.检查主从复制服务是否正常
[root@manager mha]# masterha_check_repl --conf=/usr/local/mha/mha.cnf
Sun Nov 29 00:34:03 2015 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Sun Nov 29 00:34:03 2015 - [info] Reading application default configurations from /usr/local/mha/mha.cnf.. Sun Nov 29 00:34:03 2015 - [info] Reading server configurations from /usr/local/mha/mha.cnf.. Sun Nov 29 00:34:03 2015 - [info] MHA::MasterMonitor version 0.55. Sun Nov 29 00:34:03 2015 - [info] Dead Servers: Sun Nov 29 00:34:03 2015 - [info] Alive Servers: Sun Nov 29 00:34:03 2015 - [info] master1(192.168.0.222:3306) Sun Nov 29 00:34:03 2015 - [info] master2(192.168.0.223:3306) Sun Nov 29 00:34:03 2015 - [info] slave1(192.168.0.224:3306) Sun Nov 29 00:34:03 2015 - [info] slave2(192.168.0.225:3306) Sun Nov 29 00:34:03 2015 - [info] Alive Slaves: Sun Nov 29 00:34:03 2015 - [info] master2(192.168.0.223:3306) Version=5.6.27-log (oldest major version between slaves) log-bin:enabled Sun Nov 29 00:34:03 2015 - [info] Replicating from 192.168.0.222(192.168.0.222:3306) Sun Nov 29 00:34:03 2015 - [info] Primary candidate for the new Master (candidate_master is set) Sun Nov 29 00:34:03 2015 - [info] slave1(192.168.0.224:3306) Version=5.6.27-log (oldest major version between slaves) log-bin:enabled Sun Nov 29 00:34:03 2015 - [info] Replicating from 192.168.0.222(192.168.0.222:3306) Sun Nov 29 00:34:03 2015 - [info] Not candidate for the new Master (no_master is set) Sun Nov 29 00:34:03 2015 - [info] slave2(192.168.0.225:3306) Version=5.6.27-log (oldest major version between slaves) log-bin:enabled Sun Nov 29 00:34:03 2015 - [info] Replicating from 192.168.0.222(192.168.0.222:3306) Sun Nov 29 00:34:03 2015 - [info] Not candidate for the new Master (no_master is set) Sun Nov 29 00:34:03 2015 - [info] Current Alive Master: master1(192.168.0.222:3306) Sun Nov 29 00:34:03 2015 - [info] Checking slave configurations.. Sun Nov 29 00:34:03 2015 - [info] read_only=1 is not set on slave master2(192.168.0.223:3306). Sun Nov 29 00:34:03 2015 - [warning] relay_log_purge=0 is not set on slave master2(192.168.0.223:3306). Sun Nov 29 00:34:03 2015 - [info] read_only=1 is not set on slave slave1(192.168.0.224:3306). Sun Nov 29 00:34:03 2015 - [warning] relay_log_purge=0 is not set on slave slave1(192.168.0.224:3306). Sun Nov 29 00:34:03 2015 - [info] read_only=1 is not set on slave slave2(192.168.0.225:3306). Sun Nov 29 00:34:03 2015 - [warning] relay_log_purge=0 is not set on slave slave2(192.168.0.225:3306). Sun Nov 29 00:34:03 2015 - [info] Checking replication filtering settings.. Sun Nov 29 00:34:03 2015 - [info] binlog_do_db= , binlog_ignore_db= Sun Nov 29 00:34:03 2015 - [info] Replication filtering check ok. Sun Nov 29 00:34:03 2015 - [info] Starting SSH connection tests.. Sun Nov 29 00:34:07 2015 - [info] All SSH connection tests passed successfully. Sun Nov 29 00:34:07 2015 - [info] Checking MHA Node version.. Sun Nov 29 00:34:08 2015 - [info] Version check ok. Sun Nov 29 00:34:08 2015 - [info] Checking SSH publickey authentication settings on the current master.. Sun Nov 29 00:34:08 2015 - [info] HealthCheck: SSH to master1 is reachable. Sun Nov 29 00:34:09 2015 - [info] Master MHA Node version is 0.54. Sun Nov 29 00:34:09 2015 - [info] Checking recovery script configurations on the current master.. Sun Nov 29 00:34:09 2015 - [info] Executing command: save_binary_logs --command=test --start_pos=4 --binlog_dir=/mydata/bin_log/ --output_file=/var/tmp/save_binary_logs_test --manager_version=0.55 --start_file=mysql-bin.000002 Sun Nov 29 00:34:09 2015 - [info] Connecting to root@master1(master1).. Creating /var/tmp if not exists.. ok. Checking output directory is accessible or not.. ok. Binlog found at /mydata/bin_log/, up to mysql-bin.000002 Sun Nov 29 00:34:09 2015 - [info] Master setting check done. Sun Nov 29 00:34:09 2015 - [info] Checking SSH publickey authentication and checking recovery script configurations on all alive slave servers.. Sun Nov 29 00:34:09 2015 - [info] Executing command : apply_diff_relay_logs --command=test --slave_user='mha_rep' --slave_host=master2 --slave_ip=192.168.0.223 --slave_port=3306 --workdir=/var/tmp --target_version=5.6.27-log --manager_version=0.55 --relay_log_info=/mydata/data/relay-log.info --relay_dir=/mydata/data/ --slave_pass=xxx Sun Nov 29 00:34:09 2015 - [info] Connecting to root@192.168.0.223(master2:22).. Can't exec "mysqlbinlog": 没有那个文件或目录 at /usr/share/perl5/vendor_perl/MHA/BinlogManager.pm line 99. mysqlbinlog version not found! at /usr/bin/apply_diff_relay_logs line 482 Sun Nov 29 00:34:09 2015 - [error][/usr/share/perl5/vendor_perl/MHA/MasterMonitor.pm, ln195] Slaves settings check failed! Sun Nov 29 00:34:09 2015 - [error][/usr/share/perl5/vendor_perl/MHA/MasterMonitor.pm, ln375] Slave configuration failed. Sun Nov 29 00:34:09 2015 - [error][/usr/share/perl5/vendor_perl/MHA/MasterMonitor.pm, ln386] Error happend on checking configurations. at /usr/bin/masterha_check_repl line 48 Sun Nov 29 00:34:09 2015 - [error][/usr/share/perl5/vendor_perl/MHA/MasterMonitor.pm, ln482] Error happened on monitoring servers. Sun Nov 29 00:34:09 2015 - [info] Got exit code 1 (Not master dead). MySQL Replication Health is NOT OK!
报错解决:
ln -s /app/mysql/bin/mysql /usr/bin/mysql ln -s /app/mysql/bin/mysqlbinlog /usr/bin/mysqlbinlog
四、mha实验
1、必须提前检测ssh连接和主从复制两项服务
[root@manager ~]# masterha_check_ssh --conf=/usr/local/mha/mha.cnf [root@manager ~]# masterha_check_repl --conf=/usr/local/mha/mha.cnf 确定两条命令的返回结果都是无异常的，然后启动mha服务
2、启动manager服务器
[root@manager ~]# nohup masterha_manager --conf=/usr/local/mha/mha.cnf > /tmp/mha_manager.log 2>&1 &
3.测试流程
(1)停掉主库,查看日志 (2)查看备主机上得IP,看是否有VIP漂移 (3)查看所有的从机. show slave status\G;
五:启动主的master,重新change master
