Mysql+keepalived
阿新 • • 發佈：2018-11-06
需求說明
mysql+keepalived實現高可用
環境說明
| ip | 伺服器型別 |
|---|---|
| 172.16.11.19 | mysql（master） |
| 172.16.11.21 | mysql（backup） |
①.關閉防火牆
[[email protected] ~]# systemctl stop firewalld.service
②.關閉selinux
[[email protected] ③.配置網路源
[[email protected] ~]# curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo [[email protected] ~]# sed -i 's/$releasever/7/g' /etc/yum.repos.d/CentOS-Base.repo
操作步驟
- 172.16.11.19
①.安裝mariadb+keepalived
[[email protected] ~]# yum -y install mariadb mariadb-server keepalived
②.給mysql設定密碼並授權給測試使用者
[[email protected] ~]# mysqladmin -uroot password lzh123!
[[email protected] ~]# mysql -uroot -plzh123!
MariaDB [(none)]> grant all privileges on *.* to ③.寫控制keepalived的指令碼
[[email protected] ~]# mkdir /scripts/
[[email protected] ~]# vim /scripts/check_my.sh
#!/bin/bash
mysql_status=`ps -ef | grep mysql | grep -Ev "grep|$0" | wc -l`
if [ $mysql_status -eq 0 ];
systemctl stop keepalived
fi
[[email protected] ~]# chmod +x /scripts/check_my.sh
④.寫傳送郵件的指令碼
[[email protected] ~]# vim /scripts/notify.sh
#!/bin/bash
VIP=$1
sendmail (){
subject="${VIP} ip address drift" content="`date +'%F-%H%M%S'`:`ip a | grep eth0 | grep inet | head -1 | awk -F '[ /]+' '{print $3}'` change to master"
echo $conter | mail -s "$subject" [email protected]
}
sendmail
[[email protected] ~]# chmod +x /scripts/notify.sh
[[email protected] ~]# yum -y install mailx
⑤.修改keepalived配置檔案
[[email protected] ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id lb_01
}
vrrp_script mysql_check {
script "/scripts/check_my.sh"
interval 1
weight -20
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
172.16.11.200
}
track_script {
mysql_check
}
notify_master "/scripts/notify.sh 172.16.11.200"
}
virtual_server 172.16.11.200 80 {
delay_loop 6
lb_algo rr
lb_kind NAT
persistence_timeout 50
protocol TCP
real_server 172.16.11.19 80 {
weight 1
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server 172.16.11.21 80 {
weight 1
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
- 172.16.11.21
①.安裝mariadb+keepalived
[[email protected] ~]# yum -y install mariadb mariadb-server keepalived
②.給mysql設定密碼並授權給測試使用者
[[email protected] ~]# mysqladmin -uroot password lzh123!
[[email protected] ~]# mysql -uroot -plzh123!
MariaDB [(none)]> grant all privileges on *.* to [email protected]'%' identified by 'test123!';
MariaDB [(none)]> flush privileges;
③.寫傳送郵件的指令碼
[[email protected] ~]# vim /scripts/notify.sh
#!/bin/bash
VIP=$1
sendmail (){
subject="${VIP} ip address drift" content="`date +'%F-%H%M%S'`:`ip a | grep ens33 | grep inet | head -1 | awk -F '[ /]+' '{print $3}'` change to master"
echo $conter | mail -s "$subject" [email protected]
}
sendmail
[[email protected] ~]# chmod +x /scripts/notify.sh
[[email protected] ~]# yum -y install mailx
④.修改keepalived配置檔案
[[email protected] ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id lb_02
}
vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id 51
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
172.16.11.200
}
notify_master "/scripts/notify.sh 172.16.11.200"
}
virtual_server 172.16.11.200 80 {
delay_loop 6
lb_algo rr
lb_kind NAT
persistence_timeout 50
protocol TCP
real_server 172.16.11.19 80 {
weight 1
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server 172.16.11.21 80 {
weight 1
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
測試
在master和backup都開啟mariadb和keepalived的時候，可以看到資料庫訪問的是172.16.11.19上面的資料庫
[[email protected] ~]# mysql -utest -ptest123! -h172.16.11.200
MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| abc |
| mysql |
| performance_schema |
| test |
+--------------------+
5 rows in set (0.01 sec)
然後在master上面關閉mariadb，可以看到keepalived被指令碼關閉，虛擬ip漂移到backup上面，然後資料庫訪問的是172.16.11.21上面的資料庫，併發送郵件提示
- 172.16.11.19
[[email protected] ~]# systemctl stop mariadb
[[email protected] ~]# systemctl status keepalived
● keepalived.service - LVS and VRRP High Availability Monitor
Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
Active: inactive (dead)
Nov 01 19:17:08 lizihan Keepalived_vrrp[13034]: VRRP_Instance(VI_1) Sending/qu...0
Nov 01 19:17:08 lizihan Keepalived_vrrp[13034]: Sending gratuitous ARP on eth0...0
Nov 01 19:17:08 lizihan Keepalived_vrrp[13034]: Sending gratuitous ARP on eth0...0
Nov 01 19:17:08 lizihan Keepalived_vrrp[13034]: Sending gratuitous ARP on eth0...0
Nov 01 19:17:08 lizihan Keepalived_vrrp[13034]: Sending gratuitous ARP on eth0...0
Nov 01 19:17:08 lizihan Keepalived[13032]: Stopping
Nov 01 19:17:08 lizihan systemd[1]: Stopping LVS and VRRP High Availability M.....
Nov 01 19:17:08 lizihan Keepalived_vrrp[13034]: VRRP_Instance(VI_1) sent 0 pri...y
Nov 01 19:17:08 lizihan Keepalived_vrrp[13034]: VRRP_Instance(VI_1) removing p....
Nov 01 19:17:09 lizihan systemd[1]: Stopped LVS and VRRP High Availability Mo...r.
Hint: Some lines were ellipsized, use -l to show in full.
- 172.16.11.21
[[email protected] ~]# 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:29:72:aa:10 brd ff:ff:ff:ff:ff:ff
inet 172.16.11.21/24 brd 172.16.11.255 scope global ens33
valid_lft forever preferred_lft forever
inet 172.16.11.200/32 scope global ens33
valid_lft forever preferred_lft forever
inet6 fe80::c6eb:d9f9:32e9:f3df/64 scope link
valid_lft forever preferred_lft forever
訪問結果
[[email protected] ~]# mysql -utest -ptest123! -h172.16.11.200
MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| cba |
| mysql |
| performance_schema |
| test |
+--------------------+
5 rows in set (0.00 sec)