预实现主从复制
配置四台主机
172.25.41.1----主节点Server1
172.25.41.2----从节点Server2
172.25.41.3----从节点Server3
以上这三台主机做主从复制，这三台主机均可以作为主节点，以便之后可以实现节点切换
添加复制用户用户如下
CREATE USER ‘octopus’@‘172.25.41.%’ IDENTIFIED BY ‘Zhangyu1998.’;
GRANT REPLICATION SLAVE ON . TO ‘octopus’@‘172.25.41.%’;
172.25.41.4-----数据库管理节点Server4
配置文件（只有srver-id不同）
server_id=1
gtid_mode=ON
enforce_gtid_consistency=ON
log_slave_updates=on
log_bin=mysql-bin
实现结果
Server1
Server2
Server3
高可用配置
软件
管理节点安装软件
yum install -y
mha4mysql-manager-0.58-0.el7.centos.noarch.rpm
perl-Config-Tiny-2.14-7.el7.noarch.rpm
perl-Email-Date-Format-1.002-15.el7.noarch.rpm
perl-Log-Dispatch-2.41-1.el7.1.noarch.rpm
perl-Mail-Sender-0.8.23-1.el7.noarch.rpm
perl-Mail-Sendmail-0.79-21.el7.noarch.rpm
perl-MIME-Lite-3.030-1.el7.noarch.rpm
perl-MIME-Types-1.38-2.el7.noarch.rpm
perl-Parallel-ForkManager-1.18-2.el7.noarch.rpm
mha4mysql-node-0.58-0.el7.centos.noarch.rpm
被管理节点安装软件
yum install mha4mysql-node-0.58-0.el7.centos.noarch.rpm -y
创建配置文件目录/etc/masterha，同时创建配置文件master.cnf
编写配置文件
[server default]
manager_log=/var/log/masterha.log
manager_workdir=/etc/masterha
master_binlog_dir=/etc/masterha
# 连接用户的密码
password=Zhangyu1998.
ping_interval=1
remote_workdir=/tmp
# 复制用户密码
repl_password=Zhangyu1998.
# 复制用户
repl_user=octopus
ssh_user=root
# 连接用户
user=root
# 节点一
[server1]
hostname=172.25.41.1
port=3306
# 节点二
[server2]
# 可以作为主节点
candidate_master=1
check_repl_delay=0
hostname=172.25.41.2
port=3306
# 节点三
[server3]
hostname=172.25.41.3
# 不可以作为主节点
no_master=1
port=3306
设置Server4免密登录
Server1、Server2、Server3、之间免密登陆(直接Server4的拷贝文件)
登录主库（172.25.41.1），赋予用户root远程登录权限
grant all on *.* to root@'%' identified by 'Zhangyu1998.';
检查ssh以及复制可用性
masterha_check_ssh --conf=/etc/masterha/master.cnf
masterha_check_repl --conf=/etc/masterha/master.cnf
关闭主数据库(172.25.41.1)
在主库挂掉的情况下进行主库手动切换测试,切换主库为（172.25.41.2）
masterha_master_switch --master_state=dead --conf=/etc/masterha/master.cnf
--dead_master_host=172.25.41.1 --dead_master_ip=172.25.41.1
--dead_master_port=3306 --new_master_host=172.25.41.2
--new_master_port=3306
发现此时主数据库变为（172.25.41.2）
将挂掉的主数据库作为新的从数据库再次加入存储
change master to master_host='172.25.41.2',master_user='octopus',master_password='Zhangyu1998.',master_auto_position=1;
在数据库启动状态下，再次将主数据修改为172.24.41.1
masterha_master_switch --master_state=alive --conf=/etc/masterha/master.cnf --new_master_host=172.25.41.1 --new_master_port=3306 --orig_master_is_new_slave --running_updates_limit=10000
设置自动切换,编写配置文件
master_ip_failover_script=/usr/local/bin/master_ip_failover
master_ip_online_change_script=/usr/local/bin/master_ip_online_change
添加脚本和可执行权限
master_ip_failover脚本
#!/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 = '172.25.41.100/24';
my $key = '1';
my $ssh_start_vip = "/sbin/ip addr add $vip dev eth0";
my $ssh_stop_vip = "/sbin/ip addr del $vip dev eth0";
GetOptions(
'command=s' => \$command,
'ssh_user=s' => \$ssh_user,
'orig_master_host=s' => \$orig_master_host,
'orig_master_ip=s' => \$orig_master_ip,
'orig_master_port=i' => \$orig_master_port,
'new_master_host=s' => \$new_master_host,
'new_master_ip=s' => \$new_master_ip,
'new_master_port=i' => \$new_master_port,
);
exit &main();
sub main {
print "\n\nIN SCRIPT TEST====$ssh_stop_vip==$ssh_start_vip===\n\n";
if ( $command eq "stop" || $command eq "stopssh" ) {
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" ) {
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";
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 {
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";
}
master_ip_online_change脚本
#!/usr/bin/env perl
use strict;
use warnings FATAL =>'all';
use Getopt::Long;
my $vip = '172.25.41.100/24';
my $key = '1';
my $ssh_start_vip = "/sbin/ip addr add $vip dev eth0";
my $ssh_stop_vip = "/sbin/ip addr del $vip dev eth0";
my $exit_code = 0;
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, $new_master_ssh_user,
);
GetOptions(
'command=s' => \$command,
'orig_master_is_new_slave' => \$orig_master_is_new_slave,
'orig_master_host=s' => \$orig_master_host,
'orig_master_ip=s' => \$orig_master_ip,
'orig_master_port=i' => \$orig_master_port,
'orig_master_user=s' => \$orig_master_user,
'orig_master_password=s' => \$orig_master_password,
'orig_master_ssh_user=s' => \$orig_master_ssh_user,
'new_master_host=s' => \$new_master_host,
'new_master_ip=s' => \$new_master_ip,
'new_master_port=i' => \$new_master_port,
'new_master_user=s' => \$new_master_user,
'new_master_password=s' => \$new_master_password,
'new_master_ssh_user=s' => \$new_master_ssh_user,
);
exit &main();
sub main {
#print "\n\nIN SCRIPT TEST====$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 "\n\n\n***************************************************************\n";
print "Disabling the VIP - $vip on old master: $orig_master_host\n";
print "***************************************************************\n\n\n\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 "\n\n\n***************************************************************\n";
print "Enabling the VIP - $vip on new master: $new_master_host \n";
print "***************************************************************\n\n\n\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 $orig_master_ssh_user\@$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 $new_master_ssh_user\@$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 {
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";
}
开启监控
nohup masterha_manager --conf=/etc/masterha/master.cnf &>/dev/null &
关闭主数据库（172.25.41.1）
查看结果
主库变为172.25.41.2
vip也被设置在172.25.41.2上
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