MHA高可用+VIP 集群故障转移(已测试成功)

 

 服务器部署说明
192.168.158.201 mha管理,mysql主服
192.168.158.202 mha节点,mysql从服
192.168.158.203 mha节点,mysql从服

Manager命令说明
masterha_check_ssh              检查MHA的SSH配置状况
masterha_check_repl             检查MySQL复制状况
masterha_manger                 启动MHA
masterha_check_status           检测当前MHA运行状态
masterha_master_monitor         检测master是否宕机
masterha_master_switch          控制故障转移（自动或者手动）
masterha_conf_host              添加或删除配置的server信息

Node命令说明
save_binary_logs                保存和复制master的二进制日志
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）

[生产环境最好搭建专属yum源]
更新yum源为aliyun[可选操作]
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
yum clean all
yum makecache

配置各台服务器之间ssh连接免密码
ssh-keygen -t  rsa
ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.158.201
ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.158.202
ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.158.203

在各台服务器上安装
rpm -ivh epel-release-6-8.noarch
rpm -qa |grep epel-release
yum -y install perl-DBD-MySQL
rpm -ivh mha4mysql-node-0.56-0.el6.noarch
rpm -qa |grep mha4mysql
mkdir -p /etc/masterha/app1
mkdir -p /etc/masterha

#建立配置文件
################################## 
cat >/etc/masterha/myha.cnf<< EOF
[server default]
manager_workdir=/masterha/app1
manager_log=/masterha/app1/manager.log
#mysql管理员和密码
user=manager
password=mgr2016
ssh_user=root 
#mysql同步密码
repl_user=rep
repl_password=rep2016
ping_interval=1      
shutdown_script="" 
#主库发生故障后转移VIP脚本
master_ip_failover_script="/usr/local/bin/master_ip_failover" 　　　　　　　　
master_ip_online_change_script="" 
report_script="" 
[server1]  
hostname=192.168.158.201
#mysql logbin文件目录
master_binlog_dir=/data/binlog
#主库要有这个参数
candidate_master=1
[server2]  
hostname=192.168.158.202
candidate_master=1
master_binlog_dir=/data/binlog
[server3]
hostname=192.168.158.203
candidate_master=1
master_binlog_dir=/data/binlog
EOF
##################################
cat >masterha_default.cnf<<EOF
[server default]
user=manager
password=mgr2016
ssh_user=root
repl_user=rep
repl_password=rep2016
ping_interval=1
master_ip_failover_script="/usr/local/bin/master_ip_failover"
master_ip_online_change_script="/usr/local/bin/master_ip_online_change"
#shutdown_script= /script/masterha/power_manager
#report_script=""
#secondary_check_script = masterha_secondary_check -s node1 -s node2 -s node3 --user=manager --master_host=node1 --master_ip=192.168.158.201 --master_port=3306
EOF
##################################
【安装mysql5.6数据库并设置主从,这里省略……】
chkconfig --add mysqld
service mysqld start
GRANT REPLICATION SLAVE ON *.* TO rep@'192.168.%'  IDENTIFIED BY 'rep2016';
GRANT all ON *.* TO 'manager'@'192.168.%'  IDENTIFIED BY 'mgr2016';
flush privileges;
CHANGE MASTER TO MASTER_HOST='192.168.158.201', MASTER_USER='rep',MASTER_PASSWORD='rep2016',master_port=3306;
ln -s /usr/local/mysql/bin/mysqlbinlog /usr/bin/mysqlbinlog
ln -s /usr/local/mysql/bin/mysql /usr/bin/mysql
 echo 'PATH=$PATH:/usr/local/mysql/bin'>>/etc/profile
. /etc/profile
##################################
cat > /etc/my.cnf << EOF
[client]
port = 3306
socket = /data/mysql.sock
#Here follows entries for some specific programs
# The MySQL server
[mysqld]
port = 3306
user = mysql
log-bin = /data/binlog/mysqlbin
socket = /data/mysql.sock
pid-file = /data/mysql.pid
log_error = /data/mysql-error.log
expire-logs-days = 14
relay-log-index=slave-relay-bin.index
relay-log=slave-relay-bin
slow_query_log = 1
slow_query_log_file=/data/slowsql.log
basedir = /usr/local/mysql
datadir = /data
tmpdir = /data/tmp
character_set_server = utf8
skip-name-resolve
[mysql]
no-auto-rehash
prompt="\u@\h:p  \R:\m:\s [\d]>"
[mysqld_safe]
log-error=/data/logs/mysqld.log
EOF
##################################
管理节点上安装以下包
yum -y install perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch
perl-Parallel-ForkManager perl-Time-HiRes 
rpm -ivh mha4mysql-manager-0.56-0.el6.noarch.rpm
VIP配置
ifconfig eth0:1 192.168.158.88/24

#测试ssh 配置
/usr/bin/masterha_check_ssh --conf=/etc/masterha/myha.cnf

#测试主从配置
masterha_check_repl --conf=/etc/masterha/myha.cnf

#master 切换测试
masterha_master_switch --master_state=alive --conf=/etc/masterha/myha.cnf --new_master_host=192.168.158.202 --new_master_port=3306 --orig_master_is_new_slave --running_updates_limit=1000
#查看192.168.158.202主机IP情况
#查看192.168.158.203从库的slave status;

#开启管理节点进程 
nohup masterha_manager --conf=/etc/masterha/myha.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/masterha_manger.log 2>&1 &

#停止
masterha_stop --conf=/etc/masterha/myha.cnf

#查状态
masterha_check_status --conf=/etc/masterha/myha.cnf

##################################
VIP切换perl脚本
cat /usr/local/bin/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 = '192.168.158.88/24';  # Virtual IP
my $key = "1";
my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip";
my $ssh_stop_vip = "/sbin/ifconfig eth0:$key down";
$ssh_user = "root";
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 " IN SCRIPT TEST====$ssh_stop_vip==$ssh_start_vip=== ";

    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 ";
            &stop_vip();
            $exit_code = 0;
        };
        if ($@) {
            warn "Got Error: $@ ";
            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 ";
            &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 ";
        `ssh $ssh_user@cluster1 " $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 ";
}
##################################