一，安装MHA基本环境
安装MHA节点
（1）基本环境说明
角色IP地址主机名
=========================================
主机192.168.1.121节点1
从机192.168.1.122节点2
从机192.168.1.123节点3
监视主机192.168.1.125节点5
（2）在node1，node2，node3，node5中操作：
＃vi / etc / hosts
192.168.1.121 node1
192.168.1.122 node2
192.168.1.123 node3
192.168.1.125 node5
安装MHA节点节点软件包：
＃rpm -ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm＃yum
install perl-DBD-MySQL perl-CPAN -y
＃tar xf mha4mysql -node-0.56.tar.gz
＃cd mha4mysql-node-0.56
＃perl Makefile.PL
＃make && make install
安装MHA
在节点5管理节点上操作：注：MHA管理器主机也是需要安装MHA节点，MHA管理器
＃yum install perl-DBD-MySQL perl-CPAN perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager perl-time-HiRes -y
＃tar xf mha4mysql-manager-0.56.tar.gz
＃cd mha4mysql-manager -0.56
＃perl Makefile.PL
＃make && make install
＃说明：安装的脚本程序都在/ usr / local / bin /目录下。
3.节点间配置SSH登录无密码验证（MHA主机之间使用密钥登录）
在node5（Monitor）中：
＃ssh-keygen -t rsa
＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node1
＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node2
＃ssh- copy-id -i /root/.ssh/id_rsa.pub root @ node3
在node1（Master）中：
＃ssh-keygen -t rsa
＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node2
＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node3
＃ssh- copy-id -i /root/.ssh/id_rsa.pub root @ node5
在node2（slave）中：
＃ssh-keygen -t rsa
＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node1
＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node3
＃ssh- copy-id -i /root/.ssh/id_rsa.pub root @ node5
在node3（slave）中：
＃ssh-keygen -t rsa
＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node1
＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node2
＃ssh- copy-id -i /root/.ssh/id_rsa.pub root @ node5
二，搭建主从复制环境
主从复制环境配置过程
（1）mysql安装过程略，但是三节点要创建如下链接
node1（主），node2（主备从），node3（从）
注意：创建如下链接：
ln -s / usr / local / mysql / bin / * / usr / local / bin /
node1 my.cnf
server-id = 1
binlog-format = ROW
log-bin = master-bin
log-bin-index = master-bin.index
log-slave-updates = true
relay_log_purge = 0
node2 my.cnf
server-id = 2
binlog-format = ROW
log-bin = master-bin
log-bin-index = master-bin.index
log-slave-updates = true
relay_log_purge = 0
node3 my.cnf
binlog-format = ROW
log-bin = mysql-bin
relay-log = slave-relay-bin
relay-log-index = slave-relay-bin.index
log-slave-updates = true
server-id = 11
skip-name- resolve
relay_log_purge = 0
（2）在node1（Master）上备份一份完整的数据：
＃mysqldump -uroot -p123456 --master-data = 2 - 单事务-R - triggers -A> all.sql
其中--master-data = 2代表备份时刻记录主的Binlog位置和位置。
（3）在node1（Master）上创建复制用户：
mysql>授予复制从机*。*到‘123456‘确定的‘repl‘@‘192.168.1.%‘;
刷新权限;
（4）查看主库备份时的binlog名称和位置，MASTER_LOG_FILE和MASTER_LOG_POS：
＃head -n 30 all.sql | grep‘CHANGE MASTER TO‘
- CHANGE MASTER TO MASTER_LOG_FILE =‘master-bin.000004‘，MASTER_LOG_POS = 120;
（5）把备份复制到192.168.1.122和192.168.1.123
＃scp all.sql
192.168.1.122:/root/＃scp all.sql 192.168.1.123:/root/
（6）分别在两台服务器上导入备份，执行复制相关命令
在node2，node3主机上操作：
＃mysql -uroot -p123456 <all.sql
停止从站
CHANGE MASTER TO
MASTER_HOST =‘192.168.1.121‘，
MASTER_USER =‘repl‘，
MASTER_PASSWORD =‘123456‘，
MASTER_LOG_FILE =‘master-bin.000004‘，
MASTER_LOG_POS = 120;
mysql> start slave;
显示从属状态\ G
创建MHA管理用户，在主上创建。
将*。*的所有权限授予‘123456‘标识为‘root‘@‘192.168.1.%‘的权限;
刷新权限;
三，配置Keepal VIP
vip配置可以采用两种方式，一种通过keepalived的方式管理虚拟ip的浮动;一人是通过脚本方式，本文通过keepalived方式实现
1.在node1（Master）与node2（备选主节点）安装keepalived。
＃wget的http://www.keepalived.org/software/keepalived-1.2.12.tar.gz
＃焦油XF的keepalived-1.2.12.tar.gz
＃CD的keepalived-1.2.12
＃的./configure前缀= / usr / local / keepalived
＃make && make install
＃cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/＃cp
/ usr / local / keepalived / etc / sysconfig / keepalived / etc / sysconfig /
＃mkdir / etc / keepalived
＃cp /usr/local/keepalived/etc/keepalived/keepalived.conf / etc / keepalived /
＃cp / usr / local / keepalived / sbin / keepalived / usr / sbin /
配置keepalived的配置文件，在node1（master）上配置操作如下：
注意：keepalived配置成备份 - 备份，即IP地址切换后，主起来后IP地址不切换，本文监控脚本由MHA提供，keepalived不提供对mysqld的监控。
＃vi /etc/keepalived/keepalived.conf
！保持配置文件
global_defs {
notification_email {
[email protected]
}
notification_email_from [email protected]
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id MySQL-HA
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 150
advert_int 1
nopreempt
身份验证{
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.130
}
}
配置keepalived的配置文件，在node2（备用节点）上配置操作如下：
＃vi /etc/keepalived/keepalived.conf
！保持配置文件
global_defs {
notification_email {
[email protected]
}
notification_email_from [email protected]
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id MySQL-HA
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 120
advert_int 1
nopreempt
身份验证{
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.130
}
}
4. node1，node2启动keepalived服务
＃service keepalived start
＃chkconfig keepalived on
5. node1查看VIP启动情况
[root @
node1]＃ip a 1：lo：<LOOPBACK，UP，LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link / loopback 00：00：00：00：00：00 brd 00：00：00：00：00 ：00
inet 127.0.0.1/8 scope host lo
inet6 :: 1/128 scope host
valid_lft forever preferred_lft forever
2：eth0：<BROADCAST，MULTICAST，UP，LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link / ether 00：0c ：29：4e：53：71 brd ff：ff：ff：ff：ff：ff
inet 192.168.1.121/24 brd 192.168.1.255范围全局eth0
inet 192.168.1.130/32范围全局eth0
inet6 fe80 :: 20c：29ff： fe4e：5371/64范围链接
valid_lft永远preferred_lft永远
四，配置MHA
监控创建MHA的工作目录，并且创建相关配置文件（在软件包解压后的目录里面有样例配置文件）。
＃mkdir -p / etc / masterha
＃mkdir -p / var / log / masterha / app1
＃cp mha4mysql-manager-0.56 / samples / conf / app1.cnf / etc / masterha /
修改app1.cnf配置文件，修改后的文件内容如下：
＃cat /etc/masterha/app1.cnf
[server default]
manager_workdir = / var / log / masterha / app1
manager_log = / var / log / masterha / app1 / manager.log
master_binlog_dir = / usr / local / mysql / data /
master_ip_failover_script = / usr / local / bin / master_ip_failover
master_ip_online_change_script = / usr / local / bin / master_ip_online_change
password = 123456
user = root
ping_interval = 1
remote_workdir = / tmp
repl_password = 123456
repl_user = repl
report_script = / usr / local / bin / send_report
ssh_user = root
[server1]
hostname = 192.168.1.121
port = 3306
[server2]
hostname = 192.168.1.122
port = 3306
candidate_master = 1
check_repl_delay = 0
[server3]
hostname = 192.168.1.123
port = 3306
说明：
master_ip_failover_script = / usr / local / bin / master_ip_failover #MHA自动切换执行的脚本，需要修改
master_ip_online_change_script = / usr / local / bin / master_ip_online_change ＃手动
切换 需要执行的脚本，需要修改 report_script = / usr / local / bin / send_report ＃切换 时发送邮件进行报告，需要修改
2.设置中继日志的清除方式（在每个从节点上）：
（1）在节点2，节点3从节点上操作：
将relay_log_purge = 0加入my.cnf配置文件，前面已经配置。
（2）设定定期清理继电器脚本（node2，node3上操作）：
＃猫purge_relay_log.sh
＃！/斌/ bash的
用户=根
的passwd = 123456
端口= 3306
LOG_DIR = ‘/数据/ masterha /日志‘
WORK_DIR = ‘/数据‘
清除= ‘在/ usr / local / bin目录/ purge_relay_logs‘
如果[！-d $ log_dir]
then
mkdir $ log_dir -p
fi
$ purge --user = $ user --password = $ passwd --disable_relay_log_purge --port = $ port --workdir = $ work_dir >> $ log_dir / purge_relay_logs.log 2>＆1
配置定时计划任务
＃crontab -e 0 4 * * * / bin / bash /root/purge_relay_log.sh
要求把keepalived服务引入MHA，我们只需要修改切换是触发的脚本文件master_ip_failover即可，在该脚本中添加在master发生宕机时对keepalived的处理。
（1）编辑脚本/ usr / local / bin / master_ip_failover，修改后如下：
＃vi / usr / local / bin / master_ip_failover
＃！/ usr / bin / env perl
use strict;
使用警告FATAL =>‘all‘;
使用Getopt :: Long;
我的（
$命令，$ ssh_user，$ orig_master_host，$ orig_master_ip，
$ orig_master_port，$ new_master_host，$ new_master_ip，$ new_master_port
）;
我的$ vip =‘192.168.1.130‘;
我的$ ssh_start_vip =“/etc/init.d/keepalived start”;
我的$ ssh_stop_vip =“/etc/init.d/keepalived stop”;
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 = ‘=> \ $ 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”）{
my $ exit_code = 1;
eval {
print“禁用旧主机上的VIP：$ orig_master_host \ n”;
＆stop_vip（）;
$ exit_code = 0;
};
if（$ @）{
warn“Got Error：$ @ \ n”;
退出$ exit_code;
}
exit $ exit_code;
}
elsif（$ command eq“start”）{
我的$ exit_code = 10;
eval {
print“启用VIP - $ vip on the new master - $ new_master_host \ n”;
＆start_vip（）;
$ exit_code = 0;
};
if（$ @）{
warn $ @;
退出$ exit_code;
}
exit $ exit_code;
} {
el } {
“ } ”{ “ } ”\“”
退出0;
}
else {
＆usage（）;
出口1;
}
}
sub start_vip（）{
`ssh $ ssh_user \ @ $ new_master_host \“$ ssh_start_vip \”`;
}
＃一个简单的系统调用，禁用在old_master
子上的VIP stop_vip（）{
`ssh $ ssh_user \ @ $ orig_master_host \“$ ssh_stop_vip \”`;
}}
sub usage {
“用法：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“;
}
（2）编辑脚本master_ip_online_change，修改后如下：
＃！/ usr / bin / env perl
＃版权所有（C）2011 DeNA有限公司
＃＃
这个程序是免费的软件; 您可以
根据
＃自由软件基金会发布的GNU通用公共许可证的条款重新分配和/或修改 ＃ 许可证的版本2或
＃（根据您的选择）任何更高版本。
＃＃
这个程序是分发的，希望它是有用的，
但没有任何的保证; 甚至没有
＃适销性或适用于特定用途的默示保证 。有关
详细信息，请参阅 ＃GNU通用公共许可证。
＃＃
您应该已经收到了GNU通用公共许可证
＃的副本 以及该程序; 如果不，
##注意：这是一个示例脚本，不完整。根据您的环境修改脚本。
使用严格
使用警告FATAL =>‘all‘;
使用Getopt :: Long;
使用MHA :: DBHelper;
使用MHA :: NodeUtil;
使用Time :: HiRes qw（sleep gettimeofday tv_interval）;
使用Data :: Dumper;
我的$ _tstart;
我的$ _running_interval = 0.1;
我的（
$命令，$ 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
）
我的$ vip =‘192.168.1.130/24‘;
我的$ key =‘1‘;
我的$ ssh_start_vip =“/ sbin / ifconfig eth0：$ key $ vip”;
我的$ ssh_stop_vip =“/ sbin / ifconfig eth0：$ key down”;
我的$ orig_master_ssh_port = 22;
我的$ new_master_ssh_port = 22;
exit＆main（）;
sub current_time_us {
my（$ sec，$ microsec）= gettimeofday（）;
我的$ curdate = localtime（$ sec）;
返回$ 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;
我的$ my_connection_id = shift;
我的$ running_time_threshold = shift;
我的$ type = shift;
$ running_time_threshold = 0，除非（$ running_time_threshold）;
$ type = 0，除非（$ type）;
我的@threads;
我的$ sth = $ dbh-> prepare（“SHOW PROCESSLIST”）;
$ sth-> execute（）;
while（my $ ref = $ sth-> fetchrow_hashref（））{
my $ id = $ ref - > {Id};
我的$ user = $ ref - > {User};
我的$ host = $ ref - > {Host};
我的$ command = $ ref - > {Command};
我的$ state = $ ref - > {State};
我的$ query_time = $ ref - > {Time};
我的$ 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”）;
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）;
}
推送@threads，$ ref;
}
return @threads;
}
sub main {
if（$ command eq“stop”）{
##正当地杀死当前主机上的连接
＃1.在新主机
＃2 上设置read_only = 1。DROP USER使得没有应用用户可以建立新的连接
＃3。在当前主机
＃4 上设置read_only = 1。杀死当前查询
＃*任何数据库访问失败都会导致脚本死机 。
我的$ exit_code = 1;
eval {
##在新主机上设置read_only = 1（以避免意外）
我的$ 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）;
打印current_time_us（）。“设置read_only在新的主人..”;
$ new_master_handler-> enable_read_only（）;
if（$ new_master_handler-> is_read_only（））{
print“ok。\ n”;
}
else {
die“Failed！\ n”;
}
$ new_master_handler-> disconnect（）;
＃连接到原始主机，如果发生任何数据库错误，则会死亡
$ orig_master_handler = new MHA :: DBHelper（）;
$ orig_master_handler-> connect（$ orig_master_ip，$ orig_master_port，
$ orig_master_user，$ orig_master_password，1）;
##删除应用程序用户，以便没有人可以连接。事先禁用每会话binlog
$ orig_master_handler-> disable_log_bin_local（）;
打印current_time_us（）。“在原始主机上吸引应用用户.. \ n”;
#FIXME_xxx_drop_app_user（$ orig_master_handler）;
等待N * 100毫秒，以便当前的连接可以退出
我的$ time_until_read_only = 15;
$ _tstart = [gettimeofday];
我的@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等待所有正在运行的％d线程断开连接..（最大％d毫秒）\ 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}）;
}}
##在当前主设备上设置read_only = 1，以便没有人（SUPER除外）可以写入
print_time_us（）。“在原始主机上设置read_only = 1”。
$ orig_master_handler-> enable_read_only（）;
if（$ orig_master_handler-> is_read_only（））{
print“ok。\ n”;
}
else {
die“Failed！\ n”;
}}
等待M * 100毫秒，以便当前的更新查询可以完成
我的$ 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等待所有运行的％d查询断开连接..（最大％d毫秒）\ 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();
$orig_master_handler->disconnect();
## After finishing the script, MHA executes FLUSH TABLES WITH READ LOCK
eval {
`ssh -p$orig_master_ssh_port $orig_master_ssh_user\@$orig_master_host \" $ssh_stop_vip \"`;
};
if ([email protected]) {
warn [email protected];
}
$exit_code = 0;
};
if ([email protected]) {
warn "Got Error: [email protected]\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,
$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.\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();
$new_master_handler->disconnect();
## Update master ip on the catalog database, etc
`ssh -p$new_master_ssh_port $new_master_ssh_user\@$new_master_host \" $ssh_start_vip \"`;
$exit_code = 0;
};
if ([email protected]) {
warn "Got Error: [email protected]\n";
exit $exit_code;
}
exit $exit_code;
}
elsif ( $command eq "status" ) {
# do nothing
exit 0;
}
else {
&usage();
exit 1;
}
}
sub usage {
"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;
}
(3) 编辑脚本send_report，修改后如下:
#!/usr/bin/perl
use strict;
use warnings FATAL => ‘all‘;
use Mail::Sender;
use Getopt::Long;
#new_master_host and new_slave_hosts are set only when recovering master succeeded
my ( $dead_master_host, $new_master_host, $new_slave_hosts, $subject, $body );
my $smtp=‘smtp.163.com‘;
my $mail_from=‘xxxx‘;
my $mail_user=‘xxxxx‘;
my $mail_pass=‘xxxxx‘;
my $mail_to=[‘xxxx‘,‘xxxx‘];
GetOptions(
‘orig_master_host=s‘ => \$dead_master_host,
‘new_master_host=s‘ => \$new_master_host,
‘new_slave_hosts=s‘ => \$new_slave_hosts,
‘subject=s‘ => \$subject,
‘body=s‘ => \$body,
);
mailToContacts($smtp,$mail_from,$mail_user,$mail_pass,$mail_to,$subject,$body);
sub mailToContacts {
my ( $smtp, $mail_from, $user, $passwd, $mail_to, $subject, $msg ) = @_;
open my $DEBUG, "> /tmp/monitormail.log"
or die "Can‘t open the debug file:$!\n";
my $sender = new Mail::Sender {
ctype => ‘text/plain; charset=utf-8‘,
encoding => ‘utf-8‘,
smtp => $smtp,
from => $mail_from,
auth => ‘LOGIN‘,
TLS_allowed => ‘0‘,
authid => $user,
authpwd => $passwd,
to => $mail_to,
subject => $subject,
debug => $DEBUG
};
$sender->MailMsg(
{ msg => $msg,
debug => $DEBUG
}
) or print $Mail::Sender::Error;
return 1;
}
# Do whatever you want here
exit 0;
五、MHA的日常管理
1. 检查SSH配置(node5 Monitor 监控节点上操作)，如下：
# masterha_check_ssh --conf=/etc/masterha/app1.cnf
Sun May 1 22:05:12 2016 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Sun May 1 22:05:12 2016 - [info] Reading application default configuration from /etc/masterha/app1.cnf..
Sun May 1 22:05:12 2016 - [info] Reading server configuration from /etc/masterha/app1.cnf..
Sun May 1 22:05:12 2016 - [info] Starting SSH connection tests..
Sun May 1 22:05:14 2016 - [debug]
Sun May 1 22:05:12 2016 - [debug] Connecting via SSH from [email protected](192.168.1.121:22) to [email protected](192.168.1.122:22)..
Sun May 1 22:05:13 2016 - [debug] ok.
Sun May 1 22:05:13 2016 - [debug] Connecting via SSH from [email protected](192.168.1.121:22) to [email protected](192.168.1.123:22)..
Sun May 1 22:05:13 2016 - [debug] ok.
Sun May 1 22:05:14 2016 - [debug]
Sun May 1 22:05:13 2016 - [debug] Connecting via SSH from [email protected](192.168.1.122:22) to [email protected](192.168.1.121:22)..
Sun May 1 22:05:13 2016 - [debug] ok.
Sun May 1 22:05:13 2016 - [debug] Connecting via SSH from [email protected](192.168.1.122:22) to [email protected](192.168.1.123:22)..
Sun May 1 22:05:14 2016 - [debug] ok.
Sun May 1 22:05:14 2016 - [debug]
Sun May 1 22:05:13 2016 - [debug] Connecting via SSH from [email protected](192.168.1.123:22) to [email protected](192.168.1.121:22)..
Sun May 1 22:05:14 2016 - [debug] ok.
Sun May 1 22:05:14 2016 - [debug] Connecting via SSH from [email protected](192.168.1.123:22) to [email protected](192.168.1.122:22)..
Sun May 1 22:05:14 2016 - [debug] ok.
Sun May 1 22:05:14 2016 - [info] All SSH connection tests passed successfully.
2. 检查整个复制环境状况(node5 监控节点上操作)，如下：
# masterha_check_repl --conf=/etc/masterha/app1.cnf
Sun May 1 22:46:44 2016 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Sun May 1 22:46:44 2016 - [info] Reading application default configuration from /etc/masterha/app1.cnf..
Sun May 1 22:46:44 2016 - [info] Reading server configuration from /etc/masterha/app1.cnf..
Sun May 1 22:46:44 2016 - [info] MHA::MasterMonitor version 0.56.
Sun May 1 22:46:45 2016 - [info] GTID failover mode = 0
Sun May 1 22:46:45 2016 - [info] Dead Servers:
Sun May 1 22:46:45 2016 - [info] Alive Servers:
Sun May 1 22:46:45 2016 - [info] 192.168.1.121(192.168.1.121:3306)
Sun May 1 22:46:45 2016 - [info] 192.168.1.122(192.168.1.122:3306)
Sun May 1 22:46:45 2016 - [info] 192.168.1.123(192.168.1.123:3306)
Sun May 1 22:46:45 2016 - [info] Alive Slaves:
Sun May 1 22:46:45 2016 - [info] 192.168.1.122(192.168.1.122:3306) Version=5.6.29-log (oldest major version between slaves) log-bin:enabled
Sun May 1 22:46:45 2016 - [info] Replicating from 192.168.1.121(192.168.1.121:3306)
Sun May 1 22:46:45 2016 - [info] Primary candidate for the new Master (candidate_master is set)
Sun May 1 22:46:45 2016 - [info] 192.168.1.123(192.168.1.123:3306) Version=5.6.29-log (oldest major version between slaves) log-bin:enabled
Sun May 1 22:46:45 2016 - [info] Replicating from 192.168.1.121(192.168.1.121:3306)
Sun May 1 22:46:45 2016 - [info] Current Alive Master: 192.168.1.121(192.168.1.121:3306)
Sun May 1 22:46:45 2016 - [info] Checking slave configurations..
Sun May 1 22:46:45 2016 - [info] read_only=1 is not set on slave 192.168.1.122(192.168.1.122:3306).
Sun May 1 22:46:45 2016 - [warning] relay_log_purge=0 is not set on slave 192.168.1.122(192.168.1.122:3306).
Sun May 1 22:46:45 2016 - [info] read_only=1 is not set on slave 192.168.1.123(192.168.1.123:3306).
Sun May 1 22:46:45 2016 - [warning] relay_log_purge=0 is not set on slave 192.168.1.123(192.168.1.123:3306).
Sun May 1 22:46:45 2016 - [info] Checking replication filtering settings..
Sun May 1 22:46:45 2016 - [info] binlog_do_db= , binlog_ignore_db=
Sun May 1 22:46:45 2016 - [info] Replication filtering check ok.
Sun May 1 22:46:45 2016 - [info] GTID (with auto-pos) is not supported
Sun May 1 22:46:45 2016 - [info] Starting SSH connection tests..
Sun May 1 22:46:46 2016 - [info] All SSH connection tests passed successfully.
Sun May 1 22:46:46 2016 - [info] Checking MHA Node version..
Sun May 1 22:46:47 2016 - [info] Version check ok.
Sun May 1 22:46:47 2016 - [info] Checking SSH publickey authentication settings on the current master..
Sun May 1 22:46:47 2016 - [info] HealthCheck: SSH to 192.168.1.121 is reachable.
Sun May 1 22:46:47 2016 - [info] Master MHA Node version is 0.56.
Sun May 1 22:46:47 2016 - [info] Checking recovery script configurations on 192.168.1.121(192.168.1.121:3306)..
Sun May 1 22:46:47 2016 - [info] Executing command: save_binary_logs --command=test --start_pos=4 --binlog_dir=/usr/local/mysql/data/ --output_file=/tmp/save_binary_logs_test --manager_version=0.56 --start_file=master-bin.000008
Sun May 1 22:46:47 2016 - [info] Connecting to [email protected](192.168.1.121:22)..
Creating /tmp if not exists.. ok.
Checking output directory is accessible or not..
ok.
Binlog found at /usr/local/mysql/data/, up to master-bin.000008
Sun May 1 22:46:48 2016 - [info] Binlog setting check done.
Sun May 1 22:46:48 2016 - [info] Checking SSH publickey authentication and checking recovery script configurations on all alive slave servers..
Sun May 1 22:46:48 2016 - [info] Executing command : apply_diff_relay_logs --command=test --slave_user=‘root‘ --slave_host=192.168.1.122 --slave_ip=192.168.1.122 --slave_port=3306 --workdir=/tmp --target_version=5.6.29-log --manager_version=0.56 --relay_log_info=/usr/local/mysql/data/relay-log.info --relay_dir=/usr/local/mysql/data/ --slave_pass=xxx
Sun May 1 22:46:48 2016 - [info] Connecting to [email protected](192.168.1.122:22)..
Checking slave recovery environment settings..
Opening /usr/local/mysql/data/relay-log.info ... ok.
Relay log found at /usr/local/mysql/data, up to node2-relay-bin.000002
Temporary relay log file is /usr/local/mysql/data/node2-relay-bin.000002
Testing mysql connection and privileges..Warning: Using a password on the command line interface can be insecure.
done.
Testing mysqlbinlog output.. done.
Cleaning up test file(s).. done.
Sun May 1 22:46:48 2016 - [info] Executing command : apply_diff_relay_logs --command=test --slave_user=‘root‘ --slave_host=192.168.1.123 --slave_ip=192.168.1.123 --slave_port=3306 --workdir=/tmp --target_version=5.6.29-log --manager_version=0.56 --relay_log_info=/usr/local/mysql/data/relay-log.info --relay_dir=/usr/local/mysql/data/ --slave_pass=xxx
Sun May 1 22:46:48 2016 - [info] Connecting to [email protected](192.168.1.123:22)..
Checking slave recovery environment settings..
Opening /usr/local/mysql/data/relay-log.info ... ok.
Relay log found at /usr/local/mysql/data, up to slave-relay-bin.000012
Temporary relay log file is /usr/local/mysql/data/slave-relay-bin.000012
Testing mysql connection and privileges..Warning: Using a password on the command line interface can be insecure.
done.
Testing mysqlbinlog output.. done.
Cleaning up test file(s).. done.
Sun May 1 22:46:48 2016 - [info] Slaves settings check done.
Sun May 1 22:46:48 2016 - [info]
192.168.1.121(192.168.1.121:3306) (current master)
+--192.168.1.122(192.168.1.122:3306)
+--192.168.1.123(192.168.1.123:3306)
Sun May 1 22:46:48 2016 - [info] Checking replication health on 192.168.1.122..
Sun May 1 22:46:48 2016 - [info] ok.
Sun May 1 22:46:48 2016 - [info] Checking replication health on 192.168.1.123..
Sun May 1 22:46:48 2016 - [info] ok.
Sun May 1 22:46:48 2016 - [info] Checking master_ip_failover_script status:
Sun May 1 22:46:48 2016 - [info] /usr/local/bin/master_ip_failover --command=status --ssh_user=root --orig_master_host=192.168.1.121 --orig_master_ip=192.168.1.121 --orig_master_port=3306
IN SCRIPT TEST====/etc/init.d/keepalived stop==/etc/init.d/keepalived start===
Checking the Status of the script.. OK
Sun May 1 22:46:48 2016 - [info] OK.
Sun May 1 22:46:48 2016 - [warning] shutdown_script is not defined.
Sun May 1 22:46:48 2016 - [info] Got exit code 0 (Not master dead).
MySQL Replication Health is OK.
[[email protected] masterha]#
3. 开启MHA Manager监控(node5操作)如下：
# mkdir -p /var/log/masterha/app1/
# nohup masterha_manager --conf=/etc/masterha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/masterha/app1/manager.log 2>&1 &
参数说明：
--remove_dead_master_conf #该参数代表当发生主从切换后，老的主库的ip将会从配置文件中移除。
--manger_log #日志存放位置
--ignore_last_failover #在缺省情况下，如果MHA检测到连续发生宕机，会生成app1.failover.complete文件，会造成MHA管理进程无法启动。
4. 查看MHA Manager监控是否正常：
# masterha_check_status --conf=/etc/masterha/app1.cnf
app1 (pid:2480) is running(0:PING_OK), master:192.168.1.121
5. 查看启动日志(node5操作)如下：
# tail -n20 /var/log/masterha/app1/manager.log
6. 关闭MHA Manage监控：
(1) 关闭
# masterha_stop --conf=/etc/masterha/app1.cnf
(2) 启动
# nohup masterha_manager --conf=/etc/masterha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/masterha/app1/manager.log 2>&1
六、MHA Failover切换
1. 自动Failover切换
(1) 模拟master mysql关闭
(2) VIP将会切换到node2
(3) /etc/masterha/app1.cnf中将原主服务器配置文件清掉。
(4) masterha_manager监控进程会自动退出关闭，并在/var/log/masterha/app1下生成app1.failover.complete文件，manager.log会记录全过程，从服务器会自动从新的主服务器复制。
(5) 原主服务器mysqld启动的，需要清掉/var/log/masterha/app1下生成app1.failover.complete文件，添加node1配置文件到/etc/masterha/app1.cnf，通过manager.log中的记录的故障点，重新同步主服务器，成为从节点。
2. 手动Failover切换
(1) 先停MHA Manager进程。
masterha_stop --conf=/etc/masterha/app1.cnf
(2) 停掉master mysqld
(3) 手动切换，在Manager主机上操作如下：
# masterha_master_switch --master_state=dead --conf=/etc/masterha/app1.cnf --dead_master_host=192.168.1.122 --dead_master_port=3306 --new_master_host=192.168.1.121 --new_master_port=3306 --ignore_last_failover
通过观察日志可以观察切换全过程。
(4) 如上节方式恢复节点为从服务器。
3. 正常运行情况下切换(Master正在运行)
等补充。
4. 小结
通过对MMM，MHA的环境搭建测试，MHA由于采用复制架构，原理简单，在一些对数据要求比较高的环境，为了保证可靠性，最好与半同步结合使用。