1、安装mysql
yum install wget
wget https://repo.mysql.com//mysql80-community-release-el7-7.noarch.rpm
yum install mysql80-community-release-el7-7.noarch.rpm
yum install mysql-community-server
systemctl start mysqld
grep 'temporary password' /var/log/mysqld.log
2、修改密码
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'Jabcdem+9p:z';
set global validate_password.policy=0;
set global validate_password.length=6;
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123456';
create user root@'%' IDENTIFIED WITH mysql_native_password BY '123456';
create user 'repl'@'%' identified with mysql_native_password by '123456';
GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%';
create user 'mha'@'%' identified with mysql_native_password by '123456';
grant all privileges on *.* to 'mha'@'%';
flush privileges;
3、关闭selinux，重启os
vim /etc/selinux/config
4、迁移目录到/data/mysql下
systemctl stop mysqld
mv /var/lib/mysql/mysql /data
systemctl start mysqld
5、配置互信，每台都要做
ssh-keygen -t rsa
ssh-copy-id 192.168.88.200
ssh-copy-id 192.168.88.201
ssh-copy-id 192.168.88.202
6、配置mysql
#修改配置文件,开启GTID
[root@localhost ~]# vi /etc/my.cnf
[mysqld]
datadir=/data/mysql
socket=/data/mysql/mysql.sock
log_bin=/data/mysql/mysql-bin
relay_log=/data/mysql/mysql-relay-bin
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
server-id=1 #-----》每个节点都不一样
binlog_format=row
slave_exec_mode=IDEMPOTEN
explicit_defaults_for_timestamp=true
max_allowed_packet = 200M
#Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
default_authentication_plugin=mysql_native_password
#开启GTID
gtid_mode=ON
enforce_gtid_consistency=ON
character-set-server = utf8
[client]
socket=/var/lib/mysql/mysql.sock
[mysql]
default-character-set=utf8
socket=/var/lib/mysql/mysql.sock
7、
配置主从复制，在两个备节点执行
change master to
master_host="192.168.88.200",
master_user="repl",
master_password="123456",
master_auto_position=1;
start slave;
show slave status\G
8、安装mha依赖包
[root@localhost ~]# yum -y install epel-release
[root@localhost ~]#yum install -y perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager perl-ExtUtils-CBuilder perl-ExtUtils-MakeMaker perl-CPAN
安装mha 每台服务器都需要：
[root@localhost ~]# wget https://qiniu.wsfnk.com/mha4mysql-node-0.58-0.el7.centos.noarch.rpm
[root@localhost ~]# rpm -ivh mha4mysql-node-0.58-0.el7.centos.noarch.rpm
安装manager节点，只在manager上安装，这里在db3上执行
wget https://qiniu.wsfnk.com/mha4mysql-manager-0.58-0.el7.centos.noarch.rpm
rpm -ivh mha4mysql-manager-0.58-0.el7.centos.noarch.rpm
9、配置管理节点
[root@localhost ~]# mkdir /etc/mha
[root@localhost ~]# mkdir /home/mysql_mha
[root@localhost ~]# vim /etc/mha/mysql_mha.cnf
[server default]
#mha访问数据库的账号与密码
user=mha
password=123456
#指定mha的工作目录
manager_workdir=/home/mysql_mha
#指定管理日志路径
manager_log=/home/mysql_mha/manager.log
#指定mha在远程节点上的工作目录
remote_workdir=/home/mysql_mha
#可以使用ssh登入的用户
ssh_user=root
ssh_port=22
#指定主从复制的mysq用户和密码
repl_user=repl
repl_password=123456
#指定检测间隔时间
ping_interval=1
#指定master节点存放binlog的日志文件的目录
master_binlog_dir=/var/lib/mysql/logs
#指定一个脚本，该脚本实现了在主从切换之后，将虚拟ip漂移到新的master上
master_ip_failover_script=/usr/bin/master_ip_failover
#指定用于二次检查节点状态的节点
secondary_check_script= /usr/local/bin/masterha_secondary_check -s 192.168.88.200 -s 192.168.88.201 -s 192.168.88.202 --user=root --master_host=192.168.88.200 --master_ip=192.168.199.200 --master_port=3306
#配置集群中的节点
[server1]
hostname=192.168.88.200
port=3306
[server2]
hostname=192.168.88.201
#指定该节点可以参与master选举
candidate_master=1
check_repl_delay=0
[server3]
hostname=192.168.88.202
no_master=1
10、编辑vip配置文件
vim /usr/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 = '192.168.88.203/24'; # Virtual IP
my $key = "1";
my $ssh_start_vip = "/sbin/ifconfig ens192:$key $vip";
my $ssh_stop_vip = "/sbin/ifconfig ens192:$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 "\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 "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" ) {
# 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 \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 $ssh_user\@$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 $ssh_user\@$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\n";
}
添加权限：
chmod +x /usr/bin/master_ip_failover
11、在其他节点创建mha目录
mkdir /home/mysql_mha
12、在master节点设置vip：
ifconfig ens192:1 192.168.88.203/24
13、在manager进行检测工作，检测ssh免密和mysql主从同步
masterha_check_ssh --conf=/etc/mha/mysql_mha.cnf
masterha_check_repl --conf=/etc/mha/mysql_mha.cnf
14、启动前检查
[root@db3 ~]# masterha_check_status --conf=/etc/mha/mysql_mha.cnf
mysql_mha is stopped(2:NOT_RUNNING).
15、在manager节点上启动mha服务
nohup masterha_manager --conf=/etc/mha/mysql_mha.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /home/mysql_mha/manager.log 2>&1 &
16、测试
a、在200上停止mysql进程
systemctl stop mysqld
b、关注日志
/home/mysql_mha/manager.log
c、在201上查看vip的情况，vip已经切换到201上。
ip a
d、尝试登录数据库
mysql -uroot -p123456 -h192.168.88.203
e、恢复故障机
在原主节点启动mysql：systemctl start mysqld
指定主从，将故障机的主节点指向新的主
change master to
master_host="192.168.88.11",
master_user="rel",
master_password="mysql@123",
master_auto_position=1;
start slave;
show slave status\G
修改/etc/mha/mysql_mha.cnf
secondary_check_script=/usr/bin/masterha_secondary_check -s master-ip -s slave1-ip -s slave2-ip --user=root --master_host=master-ip --master_ip=master-ip --master_port=3306
shutdown_script=""
ssh_user=root
user=root
==========发生一次切换，原主节点【server】信息就会被清理，等server恢复后，需要把相应的信息补全
[server1]
candidate_master=1
hostname=192.168.88.200
port=3306
f、启动mha：
在monitor上启动mha进程：（192.168.88.202）
nohup masterha_manager --conf=/etc/mha/mysql_mha.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /home/mysql_mha/manager.log 2>&1 &
在monitor上检查状态：（192.168.88.202）
/usr/bin/masterha_check_status --conf=/etc/mha/mysql_mha.cnf
查看日志：（192.168.88.202）
less /home/mysql_mha/manager.log
