MYSQL5.7下搭建MHA
环境说明
在主机1，主机2，主机3上安装MySQL服务端和客户端。
|
主机1 |
主机2 |
主机3 |
|
|
操作系统 |
CentOS7.4 |
CentOS7.4 |
CentOS7.4 |
|
主机名 |
mydb1 |
mydb2 |
mydb3 |
|
IP |
192.168.1.101 |
192.168.1.102 |
192.168.1.103 |
|
VIP |
192.168.1.201 |
192.168.1.202 |
192.168.1.203 |
|
角色 |
主，MHA Manager |
主备，MHA Manager |
从，MHA Node |
|
数据库软件版本 |
mysql5.7.22 |
mysql5.7.22 |
mysql5.7.22 |
|
MySQL配置文件目位置 |
/app/mysqldata/3306/ my.cnf |
/app/mysqldata/3306/ my.cnf |
/app/mysqldata/3306/ my.cnf |
|
MHA配置文件位置 |
/etc/app1.cnf |
/etc/app1.cnf |
|
|
MHA安装包 |
/soft/MHA/ mha4mysql-node-0.58-0.el7.centos.noarch.rpm /soft/MHA/ mha4mysql-manager-0.58-0.el7.centos.noarch.rpm |
/soft/MHA/ mha4mysql-node-0.58-0.el7.centos.noarch.rpm /soft/MHA/ mha4mysql-manager-0.58-0.el7.centos.noarch.rpm |
/soft/MHA/ mha4mysql-node-0.58-0.el7.centos.noarch.rpm |
一．建立3台MHA服务器之间ssh互信
在mydb1，mydb2，mydb3服务器上分别执行：
ssh-keygen -t rsa
ssh-copy-id -i .ssh/id_rsa.pub root@192.168.1.101
ssh-copy-id -i .ssh/id_rsa.pub root@192.168.1.102
ssh-copy-id -i .ssh/id_rsa.pub root@192.168.1.103
配置master服务器hosts文件
在mydb1，mydb2，mydb3服务器上：
cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.1.101 mydb1
192.168.1.102 mydb2
192.168.1.103 mydb3
二. 配置主从关系
在mydb1上操作
修改mydb1配置文件：
vi /app/mysqldata/3306/my.cnf
在原有文件添加以下参数：
[mysqld]
server_id=1013306
log-bin = /app/mysqldata/3306/binlog/mysql-bin
log-bin-index = /app/mysqldata/3306/binlog/mysql-bin.index
启动mysql服务：
[root@mydb1 ~]# mysql_db_startup.sh 3306
添加复制用户并授权：
[root@mydb1 ~]# mysqlplus.sh 3306
(root@localhost) [(none)]> create user xtrabk@'192.168.1.%' identified by 'onlybackup';
(root@localhost) [(none)]> grant reload,lock tables,process,Replication client,super on *.* to xtrabk@'192.168.1.%';
(root@localhost) [(none)]> create user rep1@'192.168.1.%' identified by 'rep1';
(root@localhost) [(none)]> grant replication slave on *.* to 'rep1'@'192.168.1.%' identified by 'rep1';
(root@localhost) [(none)]> flush privileges;
查看是否支持动态加载半同步复制模块：（YES为可以）
(root@localhost) [(none)]> show VARIABLES LIKE 'have_dynamic_loading';
+----------------------+-------+
| Variable_name | Value |
+----------------------+-------+
| have_dynamic_loading | YES |
+----------------------+-------+
1 row in set (0.00 sec)
加载半同步复制模块：
(root@localhost) [(none)]> INSTALL PLUGIN rpl_semi_sync_master SONAME 'semisync_master.so';
(root@localhost) [(none)]> INSTALL PLUGIN rpl_semi_sync_slave SONAME 'semisync_slave.so';
判断安装是否成功
(root@localhost) [(none)]> show variables like '%semi%';
+-------------------------------------------+------------+
| Variable_name | Value |
+-------------------------------------------+------------+
| rpl_semi_sync_master_enabled | ON |
| rpl_semi_sync_master_timeout | 5000 |
| rpl_semi_sync_master_trace_level | 32 |
| rpl_semi_sync_master_wait_for_slave_count | 1 |
| rpl_semi_sync_master_wait_no_slave | ON |
| rpl_semi_sync_master_wait_point | AFTER_SYNC |
| rpl_semi_sync_slave_enabled | ON |
| rpl_semi_sync_slave_trace_level | 32 |
+-------------------------------------------+------------+
8 rows in set (0.00 sec)
ON开启半同步OFF关闭半同步
SET GLOBAL rpl_semi_sync_master_enabled = ON;
毫秒单位，5秒该参数主服务器等待确认消息5秒后，不再等待，变为异步方式。
SET GLOBAL rpl_semi_sync_master_timeout = 5000 ;
授权远程登录：
(root@localhost) [(none)]> create user dba_user@'192.168.1.%' identified by 'msds007';
(root@localhost) [(none)]> grant all privileges on *.* to 'dba_user'@'192.168.1.%';
(root@localhost) [(none)]> flush privileges;
在mydb1上建表，插入数据，使用Python脚本
创建完整备份
[root@mydb1 ~]# /app/mysqldata/scripts/my_full_backup.sh
复制和准备备份集
[root@mydb1 tmp]# scp -r xtrabackup/ mydb2:`pwd`
[root@mydb1 tmp]# scp -r xtrabackup/ mydb3:`pwd`
在mydb2上操作
mysql配置文件：
vi /app/mysqldata/3306/my.cnf
在原有文件添加以下参数：
[mysqld]
server_id = 1023306
read_only=1
relay_log_purge = 0
relay_log = /app/mysqldata/3306/binlog/mysql-relay-bin
relay_log_index = /app/mysqldata/3306/binlog/mysql-relay-bin.index
log-bin = /app/mysqldata/3306/binlog/mysql-bin
log-bin-index = /app/mysqldata/3306/binlog/mysql-bin.index
进行数据恢复
[root@mydb2 ~]# /app/mysqldata/scripts/my_full_recover.sh
[root@mydb2 ~]# mysqlplus.sh 3306
查看是否支持动态加载半同步复制模块：（YES为可以）
(root@localhost) [(none)]> show VARIABLES LIKE 'have_dynamic_loading';
+----------------------+-------+
| Variable_name | Value |
+----------------------+-------+
| have_dynamic_loading | YES |
+----------------------+-------+
1 row in set (0.00 sec)
加载半同步复制模块：
(root@localhost) [(none)]> INSTALL PLUGIN rpl_semi_sync_master SONAME 'semisync_master.so';
(root@localhost) [(none)]> INSTALL PLUGIN rpl_semi_sync_slave SONAME 'semisync_slave.so';
判断安装是否成功
(root@localhost) [(none)]> show variables like '%semi%';
+-------------------------------------------+------------+
| Variable_name | Value |
+-------------------------------------------+------------+
| rpl_semi_sync_master_enabled | ON |
| rpl_semi_sync_master_timeout | 5000 |
| rpl_semi_sync_master_trace_level | 32 |
| rpl_semi_sync_master_wait_for_slave_count | 1 |
| rpl_semi_sync_master_wait_no_slave | ON |
| rpl_semi_sync_master_wait_point | AFTER_SYNC |
| rpl_semi_sync_slave_enabled | ON |
| rpl_semi_sync_slave_trace_level | 32 |
+-------------------------------------------+------------+
8 rows in set (0.00 sec)
ON开启半同步 OFF关闭半同步
SET GLOBAL rpl_semi_sync_slave_enabled =ON;
配置Slave节点复制环境
查看备份文件中的位置信息
[root@mydb2 full]# cat xtrabackup_binlog_info
mysql-bin.000002 236874 9831a804-8c25-11e8-9a69-000c2983201e:1-3,
a5d58971-9ee1-11e8-8767-000c2983201e:1-576
设置GTID_PURGED
(root@localhost) [(none)]> prompt Slave>
Slave>stop slave;
Query OK, 0 rows affected (0.00 sec)
Slave>reset master;
Query OK, 0 rows affected (0.02 sec)
Slave>set global
GTID_PURGED='9831a804-8c25-11e8-9a69-000c2983201e:1-3,a5d58971-9ee1-11e8-8767-000c2983201e:1-576';
Query OK, 0 rows affected (0.00 sec)
Slave > change master to
master_host='192.168.1.101',master_port=3306,master_user='rep1',master_password='rep1',MASTER_AUTO_POSITION =1;
启动从库服务
Slave > start slave;
查看主从复制是否成功：
Slave > show slave statusG
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
查看mydb2上的master日志状态
Slave>show master status;
+------------------+----------+--------------+------------------+--------------------------------------------------------------------------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+--------------------------------------------------------------------------------------+
| mysql-bin.000001 | 154 | | | 9831a804-8c25-11e8-9a69-000c2983201e:1-3,
a5d58971-9ee1-11e8-8767-000c2983201e:1-576 |
+------------------+----------+--------------+------------------+--------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
在mydb3上
mysql配置文件：
vi /app/mysqldata/3306/my.cnf
在原有文件添加以下参数：
[mysqld]
server_id = 1033306
read_only = 1
relay_log_purge = 0
relay_log = /app/mysqldata/3306/binlog/mysql-relay-bin
relay_log_index = /app/mysqldata/3306/binlog/mysql-relay-bin.index
log-bin = /app/mysqldata/3306/binlog/mysql-bin
log-bin-index = /app/mysqldata/3306/binlog/mysql-bin.index
进行数据恢复
[root@mydb3 ~]# /app/mysqldata/scripts/my_full_recover.sh
[root@mydb3 ~]# mysqlplus.sh 3306
查看是否支持动态加载半同步复制模块：（YES为可以）
(root@localhost) [(none)]> show VARIABLES LIKE 'have_dynamic_loading';
+----------------------+-------+
| Variable_name | Value |
+----------------------+-------+
| have_dynamic_loading | YES |
+----------------------+-------+
1 row in set (0.00 sec)
加载半同步复制模块：
(root@localhost) [(none)]> INSTALL PLUGIN rpl_semi_sync_master SONAME 'semisync_master.so';
(root@localhost) [(none)]> INSTALL PLUGIN rpl_semi_sync_slave SONAME 'semisync_slave.so';
判断安装是否成功
(root@localhost) [(none)]> show variables like '%semi%';
+-------------------------------------------+------------+
| Variable_name | Value |
+-------------------------------------------+------------+
| rpl_semi_sync_master_enabled | ON |
| rpl_semi_sync_master_timeout | 5000 |
| rpl_semi_sync_master_trace_level | 32 |
| rpl_semi_sync_master_wait_for_slave_count | 1 |
| rpl_semi_sync_master_wait_no_slave | ON |
| rpl_semi_sync_master_wait_point | AFTER_SYNC |
| rpl_semi_sync_slave_enabled | ON |
| rpl_semi_sync_slave_trace_level | 32 |
+-------------------------------------------+------------+
8 rows in set (0.00 sec)
ON开启半同步 OFF关闭半同步
SET GLOBAL rpl_semi_sync_slave_enabled =ON;
配置Slave节点复制环境
查看备份文件中的位置信息
[root@mydb3 full]# cat xtrabackup_binlog_info
mysql-bin.000002 236874 9831a804-8c25-11e8-9a69-000c2983201e:1-3,
a5d58971-9ee1-11e8-8767-000c2983201e:1-576
设置GTID_PURGED
(root@localhost) [(none)]> prompt Slave>
Slave>stop slave;
Query OK, 0 rows affected (0.00 sec)
Slave>reset master;
Query OK, 0 rows affected (0.02 sec)
Slave>set global
GTID_PURGED='9831a804-8c25-11e8-9a69-000c2983201e:1-3,a5d58971-9ee1-11e8-8767-000c2983201e:1-576';
Query OK, 0 rows affected (0.00 sec)
Slave > change master to
master_host='192.168.1.101',master_port=3306,master_user='rep1',master_password='rep1',MASTER_AUTO_POSITION =1;
启动从库服务：
Slave > start slave;
查看主从复制是否成功：
Slave > show slave statusG
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
三.主从复制配置完成，开始配置MHA
mydb1和mydb2上操作
使用阿里yum源
1.删除自带的yum源：
#cd /etc/yum.repos.d/
#rm -rf *
2.配置远程yum源：
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
将$releasever替换为7
3.进行验证yum源配置成功：
清除缓存yum源
#yum clean all
4.链接远程的yum源
#yum makecache
5.查看已配置好的yum源信息“
#yum repolist
#先安装依赖
wget http://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
rpm -ivh epel-release-latest-7.noarch.rpm
yum install perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager -y
需自行下载mysql MHA CentOS7相关依赖包，下载地址：https://centos.pkgs.org/
yum install -y perl-Params-Validate-1.08-4.el7.x86_64.rpm
yum install -y perl-Parallel-ForkManager-1.18-2.el7.noarch.rpm
yum install -y perl-MIME-Types-1.38-2.el7.noarch.rpm
yum install -y perl-MIME-Lite-3.030-1.el7.noarch.rpm
yum install -y perl-Mail-Sendmail-0.79-21.el7.noarch.rpm
yum install -y perl-Mail-Sender-0.8.23-1.el7.noarch.rpm
yum install -y perl-Log-Dispatch-2.41-1.el7.1.noarch.rpm
yum install -y perl-Email-Date-Format-1.002-15.el7.noarch.rpm
yum install -y perl-Config-Tiny-2.14-7.el7.noarch.rpm
yum install -y perl-Mail-Send-Loop-0.3-alt1.noarch.rpm 不需要这个
上传了百度云盘，包括上面的软件包和安装包
链接：https://pan.baidu.com/s/1p4ShAhAgNUnqMf6s1lP84Q 密码：11mr
使用yum安装，这步有点繁琐
yum install -y mha4mysql-node-0.58-0.el7.centos.noarch.rpm
yum install -y mha4mysql-manager-0.58-0.el7.centos.noarch.rpm
/usr/bin目录下
save_binary_logs 保存和复制master的二进制日志
purge_relay_logs 清除中继日志(不会阻塞SQL线程)
filter_mysqlbinlog 去除不必要的ROLLBACK事件(已不再使用)
apply_diff_relay_logs 识别差异的中继日志事件并将其差异应用于其他的slave
masterha_stop 停止MHA
masterha_secondary_check 用于检查来自多个网络路由的主机可用性
masterha_master_switch 控制故障转移(自动或手动)
masterha_master_monitor 检测master是否宕机
masterha_manager 启动MHA
masterha_conf_host 添加或删除配置的server信息
masterha_check_status 检查当前MHA的运行状态
masterha_check_ssh 检查MHA的SSH配置状况
masterha_check_repl 检查MySQL复制状况
mydb3上操作
yum install -y mha4mysql-node-0.58-0.el7.centos.noarch.rpm
在主和主备上配置MHA参数文件
vi /etc/masterha_default.cnf
[server default]
user=dba_user
password=msds007
ssh_user=root
repl_user=rep1
repl_password=rep1
ping_interval=1
master_ip_online_change_script="/masterha/app1/master_ip_online_change.pl"
master_ip_failover_script="/masterha/app1/master_ip_failover.pl"
report_script="/masterha/app1/send_report"
shutdown_script="/masterha/app1/power_manager"
secondary_check_script="masterha_secondary_check -s mydb1 -s mydb2"
vi /etc/app1.cnf
[server default]
manager_workdir=/var/log/masterha/app1
manager_log=/var/log/masterha/app1/app1.log
remote_workdir=/var/log/masterha/app1
[server1]
hostname=192.168.1.101
master_binlog_dir = /app/mysqldata/3306/binlog
candidate_master=1
check_repl_delay=0
[server2]
hostname=192.168.1.102
master_binlog_dir = /app/mysqldata/3306/binlog
candidate_master=1
check_repl_delay=0
[server3]
hostname=192.168.1.103
master_binlog_dir = /app/mysqldata/3306/binlog
no_master=1
ignore_fail=1
mydb1和mydb2上操作
mkdir -p /masterha/app1/
编辑/masterha/app1/master_ip_failover.pl
# chmod +x master_ip_failover.pl
注意修改vip及网卡
#!/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 = '192.168.1.201/24'; #此处为你要设置的虚拟ip
my $key = '1';
my $ssh_start_vip = "/sbin/ifconfig ens33:$key $vip"; #此处改为你的网卡名称
my $ssh_stop_vip = "/sbin/ifconfig ens33:$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' => $new_master_port,
);
exit &main();
sub main {
print " IN SCRIPT TEST====$ssh_stop_vip==$ssh_start_vip=== ";
if ( $command eq "stop" || $command eq "stopssh" ) {
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" ) {
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 ";
exit 0;
}
else {
&usage();
exit 1;
}
}
sub start_vip() {
`ssh $ssh_user@$new_master_host " $ssh_start_vip "`;
}
sub stop_vip() {
return 0 unless ($ssh_user);
`ssh $ssh_user@$orig_master_host " $ssh_stop_vip "`;
}
sub usage {
"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 ";
}
编辑/masterha/app1/master_ip_online_change.pl
# chmod +x master_ip_online_change.pl
注意修改vip及网卡
#!/usr/bin/env perl
use strict;
use warnings FATAL => 'all';
use Getopt::Long;
use MHA::DBHelper;
use MHA::NodeUtil;
use Time::HiRes qw( sleep gettimeofday tv_interval );
use Data::Dumper;
my $_tstart;
my $_running_interval = 0.1;
my (
$command,
$orig_master_is_new_slave, $orig_master_host, $orig_master_ip, $orig_master_port, $orig_master_user, $orig_master_password, $orig_master_ssh_user,
$new_master_host, $new_master_ip, $new_master_port, $new_master_user, $new_master_password, $new_master_ssh_user,
);
my $vip = '192.168.1.201/24'; #此处为你要设置的虚拟ip
my $key = '1';
my $ssh_start_vip = "/sbin/ifconfig ens33:$key $vip"; #此处改为你的网卡名称
my $ssh_stop_vip = "/sbin/ifconfig ens33:$key down";
GetOptions(
'command=s' => $command,
'orig_master_is_new_slave' => $orig_master_is_new_slave,
'orig_master_host=s' => $orig_master_host,
'orig_master_ip=s' => $orig_master_ip,
'orig_master_port=i' => $orig_master_port,
'orig_master_user=s' => $orig_master_user,
'orig_master_password=s' => $orig_master_password,
'orig_master_ssh_user=s' => $orig_master_ssh_user,
'new_master_host=s' => $new_master_host,
'new_master_ip=s' => $new_master_ip,
'new_master_port=i' => $new_master_port,
'new_master_user=s' => $new_master_user,
'new_master_password=s' => $new_master_password,
'new_master_ssh_user=s' => $new_master_ssh_user,
);
exit &main();
sub current_time_us {
my ( $sec, $microsec ) = gettimeofday();
my $curdate = localtime($sec);
return $curdate . " " . sprintf( "%06d", $microsec );
}
sub sleep_until {
my $elapsed = tv_interval($_tstart);
if ( $_running_interval > $elapsed ) {
sleep( $_running_interval - $elapsed );
}
}
sub get_threads_util {
my $dbh = shift;
my $my_connection_id = shift;
my $running_time_threshold = shift;
my $type = shift;
$running_time_threshold = 0 unless ($running_time_threshold);
$type = 0 unless ($type);
my @threads;
my $sth = $dbh->prepare("SHOW PROCESSLIST");
$sth->execute();
while ( my $ref = $sth->fetchrow_hashref() ) {
my $id = $ref->{Id};
my $user = $ref->{User};
my $host = $ref->{Host};
my $command = $ref->{Command};
my $state = $ref->{State};
my $query_time = $ref->{Time};
my $info = $ref->{Info};
$info =~ s/^s*(.*?)s*$/$1/ if defined($info);
next if ( $my_connection_id == $id );
next if ( defined($query_time) && $query_time < $running_time_threshold );
next if ( defined($command) && $command eq "Binlog Dump" );
next if ( defined($user) && $user eq "system user" );
next
if ( defined($command)
&& $command eq "Sleep"
&& defined($query_time)
&& $query_time >= 1 );
if ( $type >= 1 ) {
next if ( defined($command) && $command eq "Sleep" );
next if ( defined($command) && $command eq "Connect" );
}
if ( $type >= 2 ) {
next if ( defined($info) && $info =~ m/^select/i );
next if ( defined($info) && $info =~ m/^show/i );
}
push @threads, $ref;
}
return @threads;
}
sub main {
if ( $command eq "stop" ) {
## Gracefully killing connections on the current master
# 1. Set read_only= 1 on the new master
# 2. DROP USER so that no app user can establish new connections
# 3. Set read_only= 1 on the current master
# 4. Kill current queries
# * Any database access failure will result in script die.
my $exit_code = 1;
eval {
## Setting read_only=1 on the new master (to avoid accident)
my $new_master_handler = new MHA::DBHelper();
# args: hostname, port, user, password, raise_error(die_on_error)_or_not
$new_master_handler->connect( $new_master_ip, $new_master_port,
$new_master_user, $new_master_password, 1 );
print current_time_us() . " Set read_only on the new master.. ";
$new_master_handler->enable_read_only();
if ( $new_master_handler->is_read_only() ) {
print "ok. ";
}
else {
die "Failed! ";
}
$new_master_handler->disconnect();
# Connecting to the orig master, die if any database error happens
my $orig_master_handler = new MHA::DBHelper();
$orig_master_handler->connect( $orig_master_ip, $orig_master_port,
$orig_master_user, $orig_master_password, 1 );
## Drop application user so that nobody can connect. Disabling per-session binlog beforehand
#$orig_master_handler->disable_log_bin_local();
#print current_time_us() . " Drpping app user on the orig master.. ";
#FIXME_xxx_drop_app_user($orig_master_handler);
## Waiting for N * 100 milliseconds so that current connections can exit
my $time_until_read_only = 15;
$_tstart = [gettimeofday];
my @threads = get_threads_util( $orig_master_handler->{dbh},
$orig_master_handler->{connection_id} );
while ( $time_until_read_only > 0 && $#threads >= 0 ) {
if ( $time_until_read_only % 5 == 0 ) {
printf
"%s Waiting all running %d threads are disconnected.. (max %d milliseconds) ",
current_time_us(), $#threads + 1, $time_until_read_only * 100;
if ( $#threads < 5 ) {
print Data::Dumper->new( [$_] )->Indent(0)->Terse(1)->Dump . " "
foreach (@threads);
}
}
sleep_until();
$_tstart = [gettimeofday];
$time_until_read_only--;
@threads = get_threads_util( $orig_master_handler->{dbh},
$orig_master_handler->{connection_id} );
}
## Setting read_only=1 on the current master so that nobody(except SUPER) can write
print current_time_us() . " Set read_only=1 on the orig master.. ";
$orig_master_handler->enable_read_only();
if ( $orig_master_handler->is_read_only() ) {
print "ok. ";
}
else {
die "Failed! ";
}
## Waiting for M * 100 milliseconds so that current update queries can complete
my $time_until_kill_threads = 5;
@threads = get_threads_util( $orig_master_handler->{dbh},
$orig_master_handler->{connection_id} );
while ( $time_until_kill_threads > 0 && $#threads >= 0 ) {
if ( $time_until_kill_threads % 5 == 0 ) {
printf
"%s Waiting all running %d queries are disconnected.. (max %d milliseconds) ",
current_time_us(), $#threads + 1, $time_until_kill_threads * 100;
if ( $#threads < 5 ) {
print Data::Dumper->new( [$_] )->Indent(0)->Terse(1)->Dump . " "
foreach (@threads);
}
}
sleep_until();
$_tstart = [gettimeofday];
$time_until_kill_threads--;
@threads = get_threads_util( $orig_master_handler->{dbh},
$orig_master_handler->{connection_id} );
}
print "Disabling the VIP on old master: $orig_master_host ";
&stop_vip();
## Terminating all threads
print current_time_us() . " Killing all application threads.. ";
$orig_master_handler->kill_threads(@threads) if ( $#threads >= 0 );
print current_time_us() . " done. ";
#$orig_master_handler->enable_log_bin_local();
$orig_master_handler->disconnect();
## After finishing the script, MHA executes FLUSH TABLES WITH READ LOCK
$exit_code = 0;
};
if ($@) {
warn "Got Error: $@ ";
exit $exit_code;
}
exit $exit_code;
}
elsif ( $command eq "start" ) {
## Activating master ip on the new master
# 1. Create app user with write privileges
# 2. Moving backup script if needed
# 3. Register new master's ip to the catalog database
# We don't return error even though activating updatable accounts/ip failed so that we don't interrupt slaves' recovery.
# If exit code is 0 or 10, MHA does not abort
my $exit_code = 10;
eval {
my $new_master_handler = new MHA::DBHelper();
# args: hostname, port, user, password, raise_error_or_not
$new_master_handler->connect( $new_master_ip, $new_master_port,
$new_master_user, $new_master_password, 1 );
## Set read_only=0 on the new master
#$new_master_handler->disable_log_bin_local();
print current_time_us() . " Set read_only=0 on the new master. ";
$new_master_handler->disable_read_only();
## Creating an app user on the new master
#print current_time_us() . " Creating app user on the new master.. ";
#FIXME_xxx_create_app_user($new_master_handler);
#$new_master_handler->enable_log_bin_local();
$new_master_handler->disconnect();
## Update master ip on the catalog database, etc
print "Enabling the VIP - $vip on the new master - $new_master_host ";
&start_vip();
$exit_code = 0;
};
if ($@) {
warn "Got Error: $@ ";
exit $exit_code;
}
exit $exit_code;
}
elsif ( $command eq "status" ) {
# do nothing
exit 0;
}
else {
&usage();
exit 1;
}
}
# A simple system call that enable the VIP on the new master
sub start_vip() {
`ssh $new_master_ssh_user@$new_master_host " $ssh_start_vip "`;
}
# A simple system call that disable the VIP on the old_master
sub stop_vip() {
`ssh $orig_master_ssh_user@$orig_master_host " $ssh_stop_vip "`;
}
sub usage {
"Usage: master_ip_online_change --command=start|stop|status --orig_master_host=host --orig_master_ip=ip --orig_master_port=port --orig_master_user=user --orig_master_password=password --orig_master_ssh_user=sshuser --new_master_host=host --new_master_ip=ip --new_master_port=port --new_master_user=user --new_master_password=password --new_master_ssh_user=sshuser ";
die;
}
mydb1，mydb2和mydb3上操作
手动添加vip：
[root@mydb1 ~]# ifconfig ens33:1 192.168.1.201 只设置主ip即可
[root@mydb2 ~]# ifconfig ens33:1 192.168.1.202
[root@mydb3 ~]# ifconfig ens33:1 192.168.1.203
四.主备上用MHA工具验证互信，主从复制并且开启MHA管理进程
检查互信是否成功
masterha_check_ssh --conf=/etc/app1.cnf
判断输出有All SSH connection tests passed successfully.即检查互信成功
检查主从复制是否成功
masterha_check_repl --conf=/etc/app1.cnf
判断输出有MySQL Replication Health is OK.即主从复制搭建成功
开启管理模式（failover）
masterha_manager --conf=/etc/app1.cnf &
检查是否启动
masterha_check_status --conf=/etc/app1.cnf
停止mha
masterha_stop --conf=/etc/app1.cnf
测试
1.手工failover测试
mydb1为主，mydb2和mydb3为从
手工failover场景，master死掉，但是masterha_manager没有开启，可以通过手工failover：
masterha_master_switch --conf=/etc/app1.cnf --dead_master_host=192.168.1.101 --master_state=dead --new_master_host=192.168.1.102 --ignore_last_failover
将原来的主加入到集群中
(root@localhost) [(none)]> prompt Slave >
Slave > change master to master_host='192.168.1.102', master_port=3306, master_user='rep1', master_password='rep1',master_auto_position=1;
(root@localhost) [(none)]> start slave;
(root@localhost) [(none)]> show slave statusG
2.手动在线切换
mydb1为主，mydb2和mydb3为从
手动在线切换mha，切换时需要将在运行的masterha_manager停掉后才能切换
masterha_stop --conf=/etc/app1.cnf
masterha_master_switch --conf=/etc/app1.cnf --master_state=alive --new_master_host=192.168.1.102 --orig_master_is_new_slave --running_updates_limit=10000
3.自动failover测试
mydb1为主，mydb2和mydb3为从
masterha_manager开启后，才能进行自动failover测试
masterha_check_ssh --conf=/etc/app1.cnf
masterha_check_repl --conf=/etc/app1.cnf
masterha_manager --conf=/etc/app1.cnf &
将主库mysql进程kill掉
每次failover切换后会在管理目录生成文件app1.failover.complete ，下次在切换的时候会发现有这个文件导致切换不成功，需要手动清理掉。
rm -rf /var/log/masterha/app1/app1.failover.complete
说明：每次测试完毕后，需要清理一下/var/log/masterha/app1/下的日志，然后启动mha的manager
1.关闭192.168.1.101上的mysql(观察从库从哪里同步，及mha日志输出)
2.恢复192.168.1.101为192.168.1.102的slave
(change master语句可以在/var/log/masterha/app1/app1.log里找到)
All other slaves should start replication from here. Statement should be: CHANGE MASTER TO MASTER_HOST='192.168.1.102', MASTER_PORT=3306, MASTER_AUTO_POSITION=1, MASTER_USER='rep1', MASTER_PASSWORD='xxx';
此时需要查看/etc/app1.cnf配置文件是否被修改
https://github.com/yoshinorim/mha4mysql-manager/releases
https://github.com/yoshinorim/mha4mysql-node/releases
https://github.com/yoshinorim/mha4mysql-manager/wiki
https://github.com/yoshinorim/mha4mysql-manager/wiki/Parameters
https://github.com/yoshinorim/mha4mysql-manager
https://github.com/yoshinorim/mha4mysql-node