keepalived对mysql实现高可用

其他 2018-12-16 22:45:30 阅读次数: 0
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环境说明

主机名 IP地址 服务 系统版本
master 192.168.102.11 Keepalived
mariadb		 red-hat7
backup 192.168.102.12 keepalived
mariadb		 red-hat7
lishaui 192.168102.13 mariadb red-hat7

虚拟IP：192.168.102.200

关闭防火墙、selinux

[root@master ~]# systemctl stop firewalld
[root@master ~]# systemctl disable firewalld
[root@master ~]# setenforce 0
//另外两台同样操作

安装Keepalived

[root@master ~]# yum -y install keepalived

[root@backup ~]# yum -y install keepalived

主服务端配置

[root@master ~]# vim /etc/keepalived/keepalived.conf```
[root@master ~]# cat /etc/keepalived/keepalived.conf 
! Configuration File for keepalived
global_defs {
 router_id dsb1
}
vrrp_instance VI_1 {
 state MASTER
 interface ens33
 virtual_router_id 10
 priority 100
 advert_int 1
 authentication {
 auth_type PASS
 auth_pass 123456
 }
 virtual_ipaddress {
 192.168.102.200/24
 }
}
virtual_server 192.168.102.200 80 {
 delay_loop 6
 lb_algo rr
 lb_kind DR
 persistence_timeout 50
 protocol TCP
 real_server 192.168.102.11 80 {
 weight 1
 TCP_CHECK {
 connect_port 80
 connect_timeout 3
 nb_get_retry 3
 delay_before_retry 3
 }
 }
 real_server 192.168.102.12 80 {
 weight 1
 TCP_CHECK {
 connect_port 80
 connect_timeout 3
 nb_get_retry 3
 delay_before_retry 3
 }
 }
}

//重启服务
[root@master ~]# systemctl restart keepalived.service 
[root@master ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:6e:33:ed brd ff:ff:ff:ff:ff:ff
    inet 192.168.102.11/24 brd 192.168.102.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet 192.168.102.200/24 scope global secondary ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::964e:1803:187a:e45a/64 scope link 
       valid_lft forever preferred_lft forever

备服务端配置

[root@backup ~]# vim /etc/keepalived/keepalived.conf 
[root@backup ~]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
 router_id dsb02
}
vrrp_instance VI_1 {
 state BACKUP
 interface ens33
 virtual_router_id 10
 priority 90
 advert_int 1
 authentication {
 auth_type PASS
 auth_pass 123456
 }
 virtual_ipaddress {
 192.168.102.200/24
 }
}
virtual_server 192.168.102.200 80 {
 delay_loop 6
 lb_algo rr
 lb_kind DR
 persistence_timeout 50
 protocol TCP
 real_server 192.168.102.11 80 {
 weight 1
 TCP_CHECK {
 connect_port 80
 connect_timeout 3
 nb_get_retry 3
 delay_before_retry 3
 }
 }
 real_server 192.168.102.12 80 {
 weight 1
 TCP_CHECK {
 connect_port 80
 connect_timeout 3
 nb_get_retry 3
 delay_before_retry 3
 }
 }
}

//重启Keepalived
[root@backup ~]# systemctl restart keepalived.service
[root@backup ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:d7:55:24 brd ff:ff:ff:ff:ff:ff
    inet 192.168.102.12/24 brd 192.168.102.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::8e9a:25f7:4078:a18d/64 scope link 
       valid_lft forever preferred_lft forever

测试：当主的Keepalived挂掉，虚拟地址是否会出现漂移

[root@master ~]# systemctl stop keepalived.service 
[root@master ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:6e:33:ed brd ff:ff:ff:ff:ff:ff
    inet 192.168.102.11/24 brd 192.168.102.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::964e:1803:187a:e45a/64 scope link 
       valid_lft forever preferred_lft forever

[root@backup ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:d7:55:24 brd ff:ff:ff:ff:ff:ff
    inet 192.168.102.12/24 brd 192.168.102.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet 192.168.102.200/24 scope global secondary ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::8e9a:25f7:4078:a18d/64 scope link 
       valid_lft forever preferred_lft forever

安装mysql

//主
[root@master-mysql ~]# yum -y install mariadb mariadb-server
[root@master ~]# systemctl start mariadb.service 
[root@master ~]# mysql_secure_installation 
NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDB
      SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!

In order to log into MariaDB to secure it, we'll need the current
password for the root user.  If you've just installed MariaDB, and
you haven't set the root password yet, the password will be blank,
so you should just press enter here.

Enter current password for root (enter for none): 
OK, successfully used password, moving on...

Setting the root password ensures that nobody can log into the MariaDB
root user without the proper authorisation.

Set root password? [Y/n] y
New password: 
Re-enter new password: 
Password updated successfully!
Reloading privilege tables..
 ... Success!


By default, a MariaDB installation has an anonymous user, allowing anyone
to log into MariaDB without having to have a user account created for
them.  This is intended only for testing, and to make the installation
go a bit smoother.  You should remove them before moving into a
production environment.

Remove anonymous users? [Y/n] y
 ... Success!

Normally, root should only be allowed to connect from 'localhost'.  This
ensures that someone cannot guess at the root password from the network.

Disallow root login remotely? [Y/n] y
 ... Success!

By default, MariaDB comes with a database named 'test' that anyone can
access.  This is also intended only for testing, and should be removed
before moving into a production environment.

Remove test database and access to it? [Y/n] y
 - Dropping test database...
 ... Success!
 - Removing privileges on test database...
 ... Success!

Reloading the privilege tables will ensure that all changes made so far
will take effect immediately.

Reload privilege tables now? [Y/n] y
 ... Success!

Cleaning up...

All done!  If you've completed all of the above steps, your MariaDB
installation should now be secure.

Thanks for using MariaDB!

[root@master ~]# mysql -uroot -p123.com
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 12
Server version: 5.5.60-MariaDB MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> 

//备
[root@backup-mysql ~]# yum -y install mariadb mariadb-server
[root@backup ~]# systemctl start mariadb.service 
[root@backup ~]# mysql_secure_installation
NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDB
      SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!

In order to log into MariaDB to secure it, we'll need the current
password for the root user.  If you've just installed MariaDB, and
you haven't set the root password yet, the password will be blank,
so you should just press enter here.

Enter current password for root (enter for none): 
OK, successfully used password, moving on...

Setting the root password ensures that nobody can log into the MariaDB
root user without the proper authorisation.

Set root password? [Y/n] 123.com
Set root password? [Y/n] y
New password: 
Re-enter new password: 
Password updated successfully!
Reloading privilege tables..
 ... Success!


By default, a MariaDB installation has an anonymous user, allowing anyone
to log into MariaDB without having to have a user account created for
them.  This is intended only for testing, and to make the installation
go a bit smoother.  You should remove them before moving into a
production environment.

Remove anonymous users? [Y/n] y
 ... Success!

Normally, root should only be allowed to connect from 'localhost'.  This
ensures that someone cannot guess at the root password from the network.

Disallow root login remotely? [Y/n] y
 ... Success!

By default, MariaDB comes with a database named 'test' that anyone can
access.  This is also intended only for testing, and should be removed
before moving into a production environment.

Remove test database and access to it? [Y/n] y
 - Dropping test database...
 ... Success!
 - Removing privileges on test database...
 ... Success!

Reloading the privilege tables will ensure that all changes made so far
will take effect immediately.

Reload privilege tables now? [Y/n] y
 ... Success!

Cleaning up...

All done!  If you've completed all of the above steps, your MariaDB
installation should now be secure.

Thanks for using MariaDB!
[root@backup ~]# mysql -uroot -p123.com
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 13
Server version: 5.5.60-MariaDB MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]>

建库

主

MariaDB [(none)]> create database gdx;
Query OK, 1 row affected (0.00 sec)

MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| gdx                |
| mysql              |
| performance_schema |
+--------------------+
4 rows in set (0.00 sec)

MariaDB [(none)]>

备

MariaDB [(none)]> create database wow;
Query OK, 1 row affected (0.00 sec)

MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| wow                |
+--------------------+
4 rows in set (0.00 sec)

授权

//主
MariaDB [(none)]> grant all on *.* to root@'192.168.102.%' identified by '123.com';
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.00 sec)

//备
MariaDB [(none)]> grant all on *.* to root@'192.168.102.%' identified by '123.com';
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.00 sec)

客户端检测

主Keepalived没启动

[root@lishuai ~]# yum -y install mariadb*
[root@lishuai ~]# systemctl start mariadb.service 
[root@lishuai ~]# mysql -uroot -p123.com -h 192.168.102.200
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 14
Server version: 5.5.60-MariaDB MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| wow                |
+--------------------+
4 rows in set (0.00 sec)

主启动Keepalived

[root@lishuai ~]# mysql -uroot -p123.com -h 192.168.102.200
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 13
Server version: 5.5.60-MariaDB MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| gdx                |
| mysql              |
| performance_schema |
+--------------------+
4 rows in set (0.00 sec)

编写mysql状态检测脚本

[root@master ~]# cd /etc/keepalived/
[root@master keepalived]# vim mysql_c.sh
[root@master keepalived]# cat mysql_c.sh 
#!/bin/bash

A=$(ps -C mysqld --no-header | wc -l)

if [ $A -eq 0 ];then
	systemctl start mariadb.service
       	sleep 2
        if [ $(ps -C mysqld --no-header | wc -l) -eq 0 ];then
	    pkill keepalived
	fi
fi
[root@master keepalived]# chmod -x mysql_c.sh 

//编辑主的配置文件
[root@master keepalived]# vim keepalived.conf 
[root@master keepalived]# cat keepalived.conf 
! Configuration File for keepalived
global_defs {
 router_id dsb1
}
vrrp_script chk_mysql {
        script "/etc/keepalived/mysql_check.sh"
        interval 2
        weight -20
}
vrrp_instance VI_1 {
 state MASTER
 interface ens33
 virtual_router_id 10
 priority 100
 advert_int 1
 authentication {
 auth_type PASS
 auth_pass 123456
 }
     track_script {
        chk_mysql
     }
 virtual_ipaddress {
 192.168.102.200/24
 }
}
virtual_server 192.168.102.200 80 {
 delay_loop 6
 lb_algo rr
 lb_kind DR
 persistence_timeout 50
 protocol TCP
 real_server 192.168.102.11 80 {
 weight 1
 TCP_CHECK {
 connect_port 80
 connect_timeout 3
 nb_get_retry 3
 delay_before_retry 3
 }
 }
 real_server 192.168.102.12 80 {
 weight 1
 TCP_CHECK {
 connect_port 80
 connect_timeout 3
 nb_get_retry 3
 delay_before_retry 3
 }
 }
}
[root@master keepalived]# systemctl restart keepalived.service			//重启

检测

//脚本检测到mysql关闭会自动启动
[root@master keepalived]# systemctl stop mariadb.service 
[root@master keepalived]# ss -antl
State      Recv-Q Send-Q Local Address:Port               Peer Address:Port              
LISTEN     0      128     *:22                  *:*                  
LISTEN     0      100    127.0.0.1:25                  *:*                  
LISTEN     0      50      *:3306                *:*                  
LISTEN     0      128    :::22                 :::*                  
LISTEN     0      100       ::1:25                 :::*

让mysql损坏

[root@master keepalived]# vim /etc/my.cnf
[root@master keepalived]# cat /etc/my.cnf
[mysqld]
datadir=/var/lib/mysql/111
socket=/var/lib/mysql/mysql.sock
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
# Settings user and group are ignored when systemd is used.
# If you need to run mysqld under a different user or group,
# customize your systemd unit file for mariadb according to the
# instructions in http://fedoraproject.org/wiki/Systemd

[mysqld_safe]
log-error=/var/log/mariadb/mariadb.log
pid-file=/var/run/mariadb/mariadb.pid

#
# include all files from the config directory
#
!includedir /etc/my.cnf.d
[root@master keepalived]# systemctl stop mariadb.service 			//重启
[root@master keepalived]# ss -antl
State      Recv-Q Send-Q Local Address:Port               Peer Address:Port              
LISTEN     0      128     *:22                  *:*                  
LISTEN     0      100    127.0.0.1:25                  *:*                  
LISTEN     0      128    :::22                 :::*                  
LISTEN     0      100       ::1:25                 :::*

备

[root@backup ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:d7:55:24 brd ff:ff:ff:ff:ff:ff
    inet 192.168.102.12/24 brd 192.168.102.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet 192.168.102.200/24 scope global secondary ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::8e9a:25f7:4078:a18d/64 scope link 
       valid_lft forever preferred_lft forever
//地址漂移了

其他监控事例

脑裂

[root@slave ~]# mkdir -p /scripts && cd /scripts
[root@slave scripts]# vim check_keepalived.sh
#!/bin/bash
while true
do
if [ `ip a show ens33 |grep 172.16.12.250|wc -l` -ne 0 ]
then
 echo "keepalived is error!"
else
 echo "keepalived is OK !"
fi
done

从服务器配置

[root@slave scripts]# vim notify.sh
#!/bin/bash
VIP=$2
sendmail (){
 subject="${VIP}'s server keepalived state is translate"
 content="`date +'%F %T'`: `hostname`'s state change to master"
 echo $content | mail -s "$subject" [email protected]
}
case "$1" in
 master)
 nginx_status=$(ps -ef|grep -Ev "grep|$0"|grep '\bnginx\b'|wc -l)
 if [ $nginx_status -lt 1 ];then
 systemctl start nginx
 fi
 sendmail
 ;;
 backup)
 nginx_status=$(ps -ef|grep -Ev "grep|$0"|grep '\bnginx\b'|wc -l)
 if [ $nginx_status -gt 0 ];then
 systemctl stop nginx
 fi
 ;;
 *)
 echo "Usage:$0 master|backup VIP"
 ;;
esac

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