172.16.0.125 testdb  MySQL主库，MHA node节点
172.16.0.126 testdb2 MySQL从库，MHA master节点


把ISO上传到 /opt/mysql
mkdir /media/CentOS
mount -o loop /opt/mysql/rhel-server-7.4-x86_64-dvd.iso /media/CentOS

vi /etc/yum.repos.d/CentOS-Base.repo
[centos7]
name = Oracle Enterprise Linux 7-64bit DVD
baseurl=file:///media/CentOS/
gpgcheck=0
enable=1


安装依赖包
yum install -y libaio
yum install -y perl perl-devel
 
 
 
解压
 
mkdir /opt/mysql
mv mysql-5.7.22-linux-glibc2.12-x86_64.tar.gz /opt/mysql/
 
cd /opt/mysql
tar -zxvf mysql-5.7.22-linux-glibc2.12-x86_64.tar.gz
 
 
 
 
创建一个链接
cd /usr/local
ln -s /opt/mysql/mysql-5.7.22-linux-glibc2.12-x86_64 mysql
 
 
 
创建运行的用户
groupadd mysql
useradd -g mysql -d /usr/local/mysql -s /sbin/nologin -M -n mysql
 
 
 
创建所需要的目录
mkdir -p /usr/local/data/{mysql,tmp}/
mkdir /var/lib/mysql
 
 
修改权限
chown -R mysql:mysql /usr/local/mysql/
chown -R mysql:mysql /usr/local/data/{mysql,tmp}/
chown mysql:mysql /var/lib/mysql
 
 
配置文件内容
#my.cnf
[client]
port = 3307
socket = /var/lib/mysql/mysql.sock
 
[mysqld]
datadir=/usr/local/data/mysql
socket=/var/lib/mysql/mysql.sock
tmpdir=/usr/local/data/tmp
user=mysql
port=3307
server-id=62
character-set-server=utf8
transaction_isolation = READ-COMMITTED #事务提交等级
old_passwords=0 #关闭旧密码选项
secure-auth=1 #防止低版本客户端访问
sql-mode="NO_AUTO_CREATE_USER" #禁止创建用户不添加密码
safe-user-create=1 #只有在mysql.user数据库表上拥有INSERT权限的用户才能使用GRANT命令
symbolic-links=0 #是否支持超链接文件
skip_name_resolve=1 #禁用DNS主机名查找
lower_case_table_names=1 #大小写不敏感
local_infile=0 #禁止使用load data
log_bin
log_slave_updates
innodb_open_files = 1000
 
innodb_adaptive_hash_index = ON #自适应辅助hash索引开启
innodb_file_per_table #innodb单独表文件
innodb_file_format=Barracuda #启用压缩
innodb_buffer_pool_size= 300MB #innodb的buff pool大小
innodb_flush_method=O_DIRECT #避免双缓冲(double buffering)和降低swap的压力
innodb_buffer_pool_dump_at_shutdown=1 #shutdown时dump出buff pool内容
innodb_buffer_pool_load_at_startup=1 #shutdown时load入buff pool内容
 
delayed_insert_limit = 100 #插入100行后允许select运行
delayed_insert_timeout = 300 #INSERT语句的执行超时时间
delayed_queue_size = 1000 #延迟队列长度
 
sort_buffer_size=2M #每个线程的sort的内存
join_buffer_size=4M #每个线程的join的内存
 
max_connections=5000 #最大连接数
max_connect_errors=1000 #最大连接错误数
max_allowed_packet=1G #数据包大小
 
table_definition_cache = 512 #存放表的定义信息
table_open_cache = 200 #存放当前已经打开的表句柄
tmp_table_size = 16777216 #临时表大小
wait_timeout = 2880000 #等待超时
interactive_timeout = 2880000
 
[mysql]
default-character-set=utf8
 
 
 
修改my.cnf权限
chown mysql:mysql /etc/my.cnf
 
 
 
添加到环境变量
echo "export PATH=$PATH:/usr/local/mysql/bin">>/etc/profile
source /etc/profile
 
 
初始化MySQL
/usr/local/mysql/bin/mysqld --defaults-file=/etc/my.cnf --basedir=/usr/local/mysql --datadir=/usr/local/data/mysql --user=mysql --initialize-insecure
 
 
启动MySQL
cp /opt/mysql/mysql-5.7.22-linux-glibc2.12-x86_64/support-files/mysql.server /etc/init.d/mysqld
 
/etc/init.d/mysqld start
 

 
修改密码
 
use mysql;
update mysql.user set authentication_string=password('chengce243') where user='root' ;
GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY 'chengce243';
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'chengce243';
flush privileges;


关闭防火墙
systemctl stop firewalld.service
systemctl disable firewalld.service
 
关闭SELinux
systemctl status firewalld
sed -i 's/^SELINUX=.*$/SELINUX=disabled/g' /etc/selinux/config
setenforce 0
 
 
主库创建账号
create user 'repl'@'172.16.0.%' identified by 'chengce243';
grant replication slave on *.* to 'repl'@'172.16.0.%';
flush privileges;

从库测试OK
mysql -h 172.16.0.125 -urepl -pchengce243

从库执行语句
change master to master_host='172.16.0.125',master_user='repl',master_password='chengce243',
master_port=3306,master_log_file='testdb-bin.000013',master_log_pos=765;

从库上查看状态：
mysql> show slave status\G;
Slave_IO_Running 和 Slave_SQL_Running都是 Yes，表示已经连接上了master，说明已经成功。


 

主库上创建账号
create user 'mhauser'@'172.16.0.%' identified by 'chengce243';
grant all privileges on *.* to 'mhauser'@'172.16.0.%';
flush privileges;


分别配置root用户和mysql用户互信


/etc/hosts 写入对应关系
172.16.0.125 testdb
172.16.0.126 testdb2

在 172.16.0.125
生成互信文件，输入如下命令，一路回车就行
ssh-keygen

cd ~/.ssh

cat id_rsa.pub > authorized_keys
chmod 600 *
cd ~/
scp -r .ssh 172.16.0.126:~/


最后每个节点都要验证
ssh testdb date
ssh testdb2 date
 


每个节点都要安装相关依赖包
yum install -y perl-devel
yum install -y perl-CPAN
yum install -y perl-Time-HiRes
yum install -y perl-DBD-MySQL
yum install -y perl-Params-Validate

yum install -y perl-Config-Tiny
yum install -y perl-Log-Dispatch
yum install -y perl-Parallel-ForkManager

上述包如果yum源没有，可到 http://rpm.pbone.net/ 网站下载

MHA 安装文件是修改过的，与官网不一样
mha4mysql-manager-0.56.tar.gz
mha4mysql-node-0.56.tar.gz


MHA master节点安装
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


MHA node节点安装
tar xf mha4mysql-node-0.56.tar.gz
cd mha4mysql-node-0.56
perl Makefile.PL
make && make install

 

为MHA的相关配置信息的存放规划目录结构（2个节点均要操作）：
mkdir -p /usr/local/masterha_work/{conf,manager_workdir,rmt_mysql_binlog_workdir,script_dir,log}

自定义规则：
conf，存放MHA的配置文件
log，存放于MHA有关的日志信息
script_dir，除了默认的存放脚本的位置外，另一个存放自定义的或者官方提供的脚本的位置
manager_workdir，Manager的工作目录
rmt_mysql_binlog_workdir，当发生切换的时候，MySQL的binlog的临时存放路径


修改配置目录权限：
chown -R mysql:mysql /usr/local/masterha_work
 



在MySQL Master配置VIP
ifconfig ens160:0 172.16.0.127 netmask 255.255.255.0 up
ifconfig ens160:0 172.16.0.127 netmask 255.255.255.0 down



master_ip_failover脚本修改

注释掉 FIXME，

原：
## Creating an app user on the new master
print "Creating app user on the new master..\n";
FIXME_xxx_create_user( $new_master_handler->{dbh} );
$new_master_handler->enable_log_bin_local();
$new_master_handler->disconnect();
## Update master ip on the catalog database, etc
FIXME_xxx;

修改如下：

## Creating an app user on the new master
print "Creating app user on the new master..\n";
#FIXME_xxx_create_user( $new_master_handler->{dbh} );
$new_master_handler->enable_log_bin_local();
$new_master_handler->disconnect();
## Update master ip on the catalog database, etc
#FIXME_xxx;

在 FIXME_xxx 后面增加对 vip 的启用：
`/usr/bin/ssh -t root\@${orig_master_ip} "ifconfig ens160:0 172.16.0.127 netmask 255.255.255.0 down"`;
`/usr/bin/ssh -t root\@${new_master_ip}  "ifconfig ens160:0 172.16.0.127 netmask 255.255.255.0 up"`;
 
注意，一定要用【;】结尾，否则脚本执行会出错。


修改 new_master_handler 中 mhamhauser用户与密码 ：

# 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 );
$new_master_handler->connect( $new_master_ip, $new_master_port,
'mhauser', 'chengce243', 1 );

 

修改后 master_ip_failover 脚本如下：

[root@testdb2 ~]# cat /usr/bin/master_ip_failover
#!/usr/bin/env perl

# Copyright (C) 2011 DeNA Co.,Ltd.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

## Note: This is a sample script and is not complete. Modify the script based on your environment.

use strict;
use warnings FATAL => 'all';

use Getopt::Long;
use MHA::DBHelper;

my (
$command, $ssh_user, $orig_master_host,
$orig_master_ip, $orig_master_port, $new_master_host,
$new_master_ip, $new_master_port, $new_master_user,
$new_master_password
);
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,
'new_master_user=s' => \$new_master_user,
'new_master_password=s' => \$new_master_password,
);

exit &main();

sub main {
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 {

# updating global catalog, etc
$exit_code = 0;
};
if ($@) {
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 {
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,
"mhauser", "chengce243", 1 );

## Set read_only=0 on the new master
$new_master_handler->disable_log_bin_local();
print "Set read_only=0 on the new master.\n";
$new_master_handler->disable_read_only();

## Creating an app user on the new master
print "Creating app user on the new master..\n";
#FIXME_xxx_create_user( $new_master_handler->{dbh} );
$new_master_handler->enable_log_bin_local();
$new_master_handler->disconnect();

## Update master ip on the catalog database, etc
#FIXME_xxx;

`echo "script begin running..." > /usr/local/masterha_work/script_dir/master_ip_failover_run_shell`;

#`/usr/bin/ssh -t root\@${orig_master_ip} "service keepalived stop" > /work_dir/mha_manager/test_me/orig_master.log`;
#`/usr/bin/ssh -t root\@${new_master_ip} "service keepalived start" > /work_dir/mha_manager/test_me/new_master.log`;
`/usr/bin/ssh -t root\@${orig_master_ip} "ifconfig ens160:0 172.16.0.127 netmask 255.255.255.0 down"`;
`/usr/bin/ssh -t root\@${new_master_ip}  "ifconfig ens160:0 172.16.0.127 netmask 255.255.255.0 up"`;

$exit_code = 0;
};
if ($@) {
warn $@;

# If you want to continue failover, exit 10.
exit $exit_code;
}
exit $exit_code;
}
elsif ( $command eq "status" ) {

# do nothing
exit 0;
}
else {
&usage();
exit 1;
}
}

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";
}

 


最后修改脚本权限：
chmod 755 /usr/bin/master_ip_failover

 


master_ip_online_change 脚本修改：

注释 FIXME_xxx_drop_app_user
原来：
## Drop application user so that nobody can connect. Disabling per-session binlog beforehand
$orig_master_handler->disable_log_bin_local();
print current_time_us() . " Drpping app user on the orig master..\n";
FIXME_xxx_drop_app_user($orig_master_handler);

修改如下：
## Drop application user so that nobody can connect. Disabling per-session binlog beforehand
$orig_master_handler->disable_log_bin_local();
print current_time_us() . " Drpping app user on the orig master..\n";
#FIXME_xxx_drop_app_user($orig_master_handler);

注释 FIXME_xxx_create_app_user
原来：
## Creating an app user on the new master
print current_time_us() . " Creating app user on the new master..\n";
FIXME_xxx_create_app_user($new_master_handler);
$new_master_handler->enable_log_bin_local();
$new_master_handler->disconnect();

修改如下：
## Creating an app user on the new master
print current_time_us() . " Creating app user on the new master..\n";
#FIXME_xxx_create_app_user($new_master_handler);
$new_master_handler->enable_log_bin_local();
$new_master_handler->disconnect();

修改 mhauser 用户的位置：
位置一：
# args: hostname, port, user, password, raise_error(die_on_error)_or_not
$new_master_handler->connect( $new_master_ip, $new_master_port,
"mhauser", "chengce243", 1 );

位置二：
# args: hostname, port, user, password, raise_error_or_not
$new_master_handler->connect( $new_master_ip, $new_master_port,
"mhauser", "chengce243", 1 );

增加 vip 的启动：
`/usr/bin/ssh -t root\@${orig_master_ip} "ifconfig ens160:0 172.16.0.127 netmask 255.255.255.0 down"`;
`/usr/bin/ssh -t root\@${new_master_ip}  "ifconfig ens160:0 172.16.0.127 netmask 255.255.255.0 up"`;


/usr/local/masterha_work/script_dir/master_ip_failover_run_shell

修改后的脚本如下：
[root@testdb2 ~]# cat /usr/bin/master_ip_online_change
#!/usr/bin/env perl

# Copyright (C) 2011 DeNA Co.,Ltd.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

## Note: This is a sample script and is not complete. Modify the script based on your environment.

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,
);
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,
"mhauser", "chengce243", 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.\n";
}
else {
die "Failed!\n";
}
$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
$orig_master_handler->disable_log_bin_local();
print current_time_us() . " Drpping app user on the orig master..\n";
#FIXME_xxx_drop_app_user($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)\n",
current_time_us(), $#threads + 1, $time_until_read_only * 100;
if ( $#threads < 5 ) {
print Data::Dumper->new( [$_] )->Indent(0)->Terse(1)->Dump . "\n"
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.\n";
}
else {
die "Failed!\n";
}

## 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)\n",
current_time_us(), $#threads + 1, $time_until_kill_threads * 100;
if ( $#threads < 5 ) {
print Data::Dumper->new( [$_] )->Indent(0)->Terse(1)->Dump . "\n"
foreach (@threads);
}
}
sleep_until();
$_tstart = [gettimeofday];
$time_until_kill_threads--;
@threads = get_threads_util( $orig_master_handler->{dbh},
$orig_master_handler->{connection_id} );
}

## Terminating all threads
print current_time_us() . " Killing all application threads..\n";
$orig_master_handler->kill_threads(@threads) if ( $#threads >= 0 );
print current_time_us() . " done.\n";
$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: $@\n";
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,
"mhauser", "chengce243", 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.\n";
$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..\n";
#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
#`/usr/bin/ssh -t root\@${orig_master_ip} "service keepalived stop"`;
#`/usr/bin/ssh -t root\@${new_master_ip} "service keepalived start"`;
`/usr/bin/ssh -t root\@${orig_master_ip} "ifconfig ens160:0 172.16.0.127 netmask 255.255.255.0 down"`;
`/usr/bin/ssh -t root\@${new_master_ip}  "ifconfig ens160:0 172.16.0.127 netmask 255.255.255.0 up"`;

$exit_code = 0;
};
if ($@) {
warn "Got Error: $@\n";
exit $exit_code;
}
exit $exit_code;
}
elsif ( $command eq "status" ) {

# do nothing
exit 0;
}
else {
&usage();
exit 1;
}
}

sub usage {
print
"Usage: master_ip_online_change --command=start|stop|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";
die;
}

 

修改文件的权限：
chmod 755 /usr/bin/master_ip_online_change

 
 
[root@testdb2 ~]# cat /usr/local/masterha_work/conf/masterha_monitor.cnf
[server default]
user=mhauser
password=chengce243

ssh_user=root

master_binlog_dir=/data/mysql
remote_workdir=/usr/local/masterha_work/rmt_mysql_binlog_workdir

repl_user=repl
repl_password=chengce243

master_ip_failover_script=/usr/bin/master_ip_failover
master_ip_online_change_script=/usr/bin/master_ip_online_change

ping_interval=30

manager_log=/usr/local/masterha_work/log/manager_monitor.log


[server1]
hostname=172.16.0.125
port=3306

[server2]
hostname=172.16.0.126
candidate_master=1
check_repl_delay=0
port=3306



# 如果是两节点slave（即三节点MHA）需要添加如下配置
#三节点MHA和两节点MHA也就这一点区别
[server3]
hostname=172.16.0.82
port=3307
no_master=1


在MHA master节点测试SSH连通性：
masterha_check_ssh --conf=/usr/local/masterha_work/conf/masterha_monitor.cnf
 

测试MySQL复制的情况：
masterha_check_repl --conf=/usr/local/masterha_work/conf/masterha_monitor.cnf

 

在testdb2上部署 call_do_mha.sh 脚本

[root@testdb2 script_dir]# cat /usr/local/masterha_work/script_dir/call_do_mha.sh
# name: call_do_mha.sh

#variables

str_mha_app=$1

while [ true ]
do
sh /usr/local/masterha_work/script_dir/do_mha.sh $str_mha_app
sleep 5
done

 


在testdb2上部署 do_mha.sh 脚本

[root@testdb2 ~]# cat /usr/local/masterha_work/script_dir/do_mha.sh
#!/bin/bash
# Script
# Name: do_mha.sh
# APP vendor: MHA
# Linux vendor: RHEL / CentOS


# --------------------------
# variable and file path

# Part:: this script
str_mha_application=$1

# Part:: Linux
# Account info
str_linux_username="root"

# Part:: MySQL
# Account info
str_mysql_username="root"
str_mysql_password="chengce243"
str_repl_port=3306
str_repl_username="repl"
str_repl_password="chengce243"
str_ip_mha_manager="172.16.0.127"

# Part:: MHA
# pid
str_pid_masterha_manager=`ps -ef | grep masterha_manager | grep "$str_mha_application" | grep perl | awk '{print $2}'`

# file
file_conf_mha_application="/usr/local/masterha_work/conf/$str_mha_application.cnf"

# file: relation / by computed
file_log_mha_manager=`cat $file_conf_mha_application | grep --color manager_log | cut -d'=' -f2`

# variable: ip info
# 如果MHA中MySQL主库的候选服务器数量超过了两台，也许下面这个list参数，就会排上用场
list_ip_candicate=`cat $file_conf_mha_application | grep -B 2 "^candidate" | grep "hostname" | cut -d'=' -f2`

str_ip_orig_master=`cat $file_log_mha_manager | grep --color "MySQL Master failover" | cut -d'(' -f2 | cut -d':' -f1 | tail -n 1`
str_ip_new_master=`cat $file_log_mha_manager | grep --color "MySQL Master failover" | cut -d'(' -f3 | cut -d':' -f1 | tail -n 1`


# 为[change master]准备的参数
str_log_file_new_master=""
str_log_pos_new_master=""

# Part:: String SQL
str_sql_mysql_change_master=""

# --------------------------
# function

function do_sql() {
# variable
func_str_ip="$1"
func_str_sql="$2"

# action
# 本场景中不涉及到对MySQL某个库的操作，所以没有选择[db]
# mysql -u $user -p"$password" $db -N -e "$f_sql_str"
mysql -u $str_mysql_username -h $func_str_ip -p"$str_mysql_password" -N -e "$func_str_sql" -P $str_repl_port
}

# 获取主库状态信息
#function get_info_mysql_master_new_master() {
# version ONE
#str_log_file_new_master=`do_sql "$str_ip_new_master" "show master status" | awk '{print $1}'`
#str_log_pos_new_master=`do_sql "$str_ip_new_master" "show master status" | awk '{print $2}'`

#}

# 生成orig_master作为slave加入new_master的[change master]SQL命令
function gen_sql_mysql_change_master() {
func_temp_master_host_sed=`cat $file_log_mha_manager | grep --color "All other slaves should start" | tail -n 1 | cut -d',' -f1 | cut -d'=' -f2 | cut -d\' -f2`
func_temp_repl_password_sed=`cat $file_log_mha_manager | grep --color "All other slaves should start" | tail -n 1 | rev | cut -d\' -f2`

echo "======================"
echo "@@ func variable: func_temp_repl_password_sed = $func_temp_repl_password_sed"
echo "======================"
str_sql_mysql_change_master=`cat $file_log_mha_manager | grep --color "All other slaves should start" | tail -n 1 | sed "s#${func_temp_repl_password_sed}#${str_repl_password}#g" | cut -d':' -f4`
str_sql_mysql_change_master=`echo $str_sql_mysql_change_master | sed "s#${func_temp_master_host_sed}#${str_ip_new_master}#g"`
}

# 对指定主机执行Linux命令
# 前提：
# 1. IP可达
# 2. SSH等价关系
function do_linux_by_ssh() {
# variable
func_str_ip="$1"
func_str_user="$2"
func_str_command="$3"

# action
# ssh -t $func_str_user@$func_str_ip "$func_str_command"
ssh -t -t $func_str_user@$func_str_ip "$func_str_command"
}

# 处理VIP的事宜
function do_part_vip() {
do_linux_by_ssh "$str_ip_new_master" "root" "service keepalived start"
do_linux_by_ssh "$str_ip_orig_master" "root" "service keepalived stop"
}

function do_part_orig_master_is_new_slave() {
do_linux_by_ssh "$str_ip_orig_master" "root" "service mysqld start"
do_sql "$str_ip_orig_master" "set global read_only=1;"
do_sql "$str_ip_orig_master" "$str_sql_mysql_change_master"
do_sql "$str_ip_orig_master" "start slave;"
}

function do_part_mha_master_manager_start() {
do_linux_by_ssh "$str_ip_mha_manager" "root" "nohup masterha_manager --conf=$file_conf_mha_application --ignore_last_failover &"
}

# 如果PID不存在，则执行该脚本，否则，退出
function runable_by_mha_manager_pid() {
echo "-----------------"
echo "Script for MySQL Master HA"
echo "-----------------"
echo "Begin:: "`date "+|%Y-%m-%d|%H:%M:%S|"`

if [[ "$str_pid_masterha_manager" == "" ]]
then
echo "## masterha_manager is [NOT ALIVED]."
else
echo "## masterha_manager is [ALIVED]."
echo "[masterha_manager] PID is:: $str_pid_masterha_manager"

# do something.
echo "## Exit Script"
exit 0
fi
}

# --------------------------
# action

# 如果PID不存在，则执行该脚本，否则，退出
echo "------------------"
echo "app: runable_by_mha_manager_pid"
runable_by_mha_manager_pid
echo ""

echo "------------------"
echo "app: gen_sql_mysql_change_master"
gen_sql_mysql_change_master
echo ""

echo "------------------"
echo "app: do_part_orig_master_is_new_slave"
do_part_orig_master_is_new_slave
echo ""

echo "------------------"
echo "app: do_part_mha_master_manager_start"
#do_part_mha_master_manager_start
nohup masterha_manager --conf=$file_conf_mha_application --ignore_last_failover > /usr/local/masterha_work/log/mha_manager.log 2>&1&
echo ""

# --------------------------
# Show time


echo "================="
echo "MySQL info:"

echo "## Account and Password"
echo "username @ $str_mysql_username"
echo "password @ $str_mysql_password"
echo "--- for REPLICATION ---"
echo "repl @ username ## $str_repl_username"
echo "repl @ password ## $str_repl_password"
echo "## Master Server info"
echo "log file @ Master ## $str_log_file_new_master"
echo "log pos @ Master ## $str_log_pos_new_master"
echo ""

echo "================="
echo "SQL statement:"
echo "[CHANGE MASTER] -->"
echo "$str_sql_mysql_change_master"
echo ""

echo "================="
echo "MasterHA info:"

echo "## File and Path"
echo "MHA Global config file @ $file_conf_mha_global"
echo "MHA Application config file @ $file_conf_mha_application"
echo "MHA Log file:: masterha_manager @ $file_log_mha_manager"

echo "## Architecture"
echo "Candicate Server list::"
echo "$list_ip_candicate"

echo "## IP"
echo "MHA Manager Server:: $str_ip_mha_manager"
echo "Last:: new master:: $str_ip_new_master"
echo "Last:: orig master:: $str_ip_orig_master"
echo ""

# --------------------------
echo "-----------------"
echo "Finished:: "`date "+|%Y-%m-%d|%H:%M:%S|"`
# Done




启动 mha守护进程
nohup masterha_manager --conf=/usr/local/masterha_work/conf/masterha_monitor.cnf --ignore_last_failover > /usr/local/masterha_work/log/mha_manager.log 2>&1&


启动 call_do_mha.sh 脚本
nohup sh /usr/local/masterha_work/script_dir/call_do_mha.sh masterha_monitor  > /usr/local/masterha_work/log/call_do_mha.log 2>&1&


检查启动的状态
masterha_check_status --conf=/usr/local/masterha_work/conf/masterha_monitor.cnf


停止mha
masterha_stop  --conf=/usr/local/masterha_work/conf/masterha_monitor.cnf