keepalived + mysql 双主
在node2，node3上安装mysql并配置主主复制
初始化mysql
[root@node2 mysqlkeepalived]# mysqld --defaults-file=/home/mysqlkeepalived/my.cnf --basedir=/home/mysqldir --datadir=/home/mysqlkeepalived/data --user=mysql --initialize
[root@node2 mysqlkeepalived]# ls
data my.cnf mysql-bin.000001 mysql-bin.index mysql-error.log mysql-slow.log
[root@node2 mysqlkeepalived]# mysqld --defaults-file=/home/mysqlkeepalived/my.cnf --user=mysql --datadir=/home/mysqlkeepalived/data &
[1] 3490
[root@node2 mysqlkeepalived]#
复制配置省略
在node2，node3上安装keepalived
[root@node2 mysqlkeepalived]# yum install keepalived
已加载插件：fastestmirror
base | 3.6 kB 00:00:00
extras | 3.4 kB 00:00:00
updates | 3.4 kB 00:00:00
Loading mirror speeds from cached hostfile
* base: mirrors.163.com
* extras: mirrors.163.com
* updates: mirrors.163.com
正在解决依赖关系
--> 正在检查事务
---> 软件包 keepalived.x86_64.0.1.3.5-6.el7 将被 安装
--> 正在处理依赖关系 ipset-libs，它被软件包 keepalived-1.3.5-6.el7.x86_64 需要
--> 正在处理依赖关系 libnetsnmpmibs.so.31()(64bit)，它被软件包 keepalived-1.3.5-6.el7.x86_64 需要
--> 正在处理依赖关系 libnetsnmpagent.so.31()(64bit)，它被软件包 keepalived-1.3.5-6.el7.x86_64 需要
--> 正在处理依赖关系 libnetsnmp.so.31()(64bit)，它被软件包 keepalived-1.3.5-6.el7.x86_64 需要
--> 正在检查事务
---> 软件包 ipset-libs.x86_64.0.6.29-1.el7 将被 安装
---> 软件包 net-snmp-agent-libs.x86_64.1.5.7.2-33.el7_5.2 将被 安装
--> 正在处理依赖关系 libsensors.so.4()(64bit)，它被软件包 1:net-snmp-agent-libs-5.7.2-33.el7_5.2.x86_64 需要
---> 软件包 net-snmp-libs.x86_64.1.5.7.2-33.el7_5.2 将被 安装
--> 正在检查事务
---> 软件包 lm_sensors-libs.x86_64.0.3.4.0-4.20160601gitf9185e5.el7 将被 安装
--> 解决依赖关系完成
依赖关系解决
=================================================================================================================================================================================================================
Package 架构 版本 源 大小
=================================================================================================================================================================================================================
正在安装:
keepalived x86_64 1.3.5-6.el7 base 329 k
为依赖而安装:
ipset-libs x86_64 6.29-1.el7 base 54 k
lm_sensors-libs x86_64 3.4.0-4.20160601gitf9185e5.el7 base 41 k
net-snmp-agent-libs x86_64 1:5.7.2-33.el7_5.2 updates 705 k
net-snmp-libs x86_64 1:5.7.2-33.el7_5.2 updates 749 k
事务概要
=================================================================================================================================================================================================================
安装 1 软件包 (+4 依赖软件包)
总下载量：1.8 M
安装大小：6.3 M
Is this ok [y/d/N]: y
Downloading packages:
(1/5): keepalived-1.3.5-6.el7.x86_64.rpm | 329 kB 00:00:00
(2/5): lm_sensors-libs-3.4.0-4.20160601gitf9185e5.el7.x86_64.rpm | 41 kB 00:00:00
(3/5): ipset-libs-6.29-1.el7.x86_64.rpm | 54 kB 00:00:00
(4/5): net-snmp-agent-libs-5.7.2-33.el7_5.2.x86_64.rpm | 705 kB 00:00:00
(5/5): net-snmp-libs-5.7.2-33.el7_5.2.x86_64.rpm | 749 kB 00:00:00
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
总计 1.7 MB/s | 1.8 MB 00:00:01
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
正在安装 : 1:net-snmp-libs-5.7.2-33.el7_5.2.x86_64 1/5
正在安装 : lm_sensors-libs-3.4.0-4.20160601gitf9185e5.el7.x86_64 2/5
正在安装 : 1:net-snmp-agent-libs-5.7.2-33.el7_5.2.x86_64 3/5
正在安装 : ipset-libs-6.29-1.el7.x86_64 4/5
正在安装 : keepalived-1.3.5-6.el7.x86_64 5/5
验证中 : 1:net-snmp-agent-libs-5.7.2-33.el7_5.2.x86_64 1/5
验证中 : ipset-libs-6.29-1.el7.x86_64 2/5
验证中 : lm_sensors-libs-3.4.0-4.20160601gitf9185e5.el7.x86_64 3/5
验证中 : keepalived-1.3.5-6.el7.x86_64 4/5
验证中 : 1:net-snmp-libs-5.7.2-33.el7_5.2.x86_64 5/5
已安装:
keepalived.x86_64 0:1.3.5-6.el7
作为依赖被安装:
ipset-libs.x86_64 0:6.29-1.el7 lm_sensors-libs.x86_64 0:3.4.0-4.20160601gitf9185e5.el7 net-snmp-agent-libs.x86_64 1:5.7.2-33.el7_5.2 net-snmp-libs.x86_64 1:5.7.2-33.el7_5.2
完毕！
[root@node2 mysqlkeepalived]# rpm -qa |grep keepalived
keepalived-1.3.5-6.el7.x86_64
[root@node2 mysqlkeepalived]#
mysql状态检测脚本：
[root@node2 keepalived]# cat checkmysql.sh
#!/bin/bash
mysqlstr=/usr/bin/mysql
host=192.168.88.18
user=root
password=root001
port=3381
mysql_status=1
$mysqlstr -h $host -u $user -p$password -P$port -e "show status;" >/dev/null 2>&1
if [ $? = 0 ] ;then
echo "mysql_status=1"
exit 0
else
systemctl stop keepalived.service
fi
keepalived的配置文件
vrrp_script chk_mysql
{
#执行脚本的路径
script "/etc/keepalived/checkmysql.sh"
#调用脚本两次之间的间隔,默认为1秒
interval 10
}
vrrp_instance VI_1
{
#状态只有MASTER和BACKUP两种，并且要大写,MASTER为工作状态，BACKUP是备用状态。
state BACKUP
nopreempt
interface eth0
#虚拟路由标识，同一个vrrp_instance的MASTER和BACKUP的vitrual_router_id 是一致的。
virtual_router_id 110
#优先级，同一个vrrp_instance的MASTER优先级必须比BACKUP高。
priority 101 //backup比该值小
#MASTER 与BACKUP 负载均衡器之间同步检查的时间间隔，单位为秒。
advert_int 5
#验证authentication。包含验证类型和验证密码。类型主要有PASS、AH 两种，通常使用的类型为PASS,
#auth_pass 1111 据说AH 使用时有问题。验证密码为明文，同一vrrp 实例MASTER 与BACKUP
#使用相同的密码才能正常通信。
#mcast_src_ip 192.168.80.110
authentication
{
auth_type PASS
auth_pass 1111
}
#虚拟ip地址,可以有多个地址，每个地址占一行，不需要子网掩码，同时这个ip 必须与我们在lvs
#客户端设定的vip 相一致！
virtual_ipaddress
{
192.168.88.223
}
track_script
{
#调用检测脚本
chk_mysql
#chk_http_port
}
}
vrrp_script chk_mysql
{
script "/etc/keepalived/checkmysql.sh"
interval 10
}
vrrp_instance VI_1
{
state BACKUP
nopreempt
interface eth0
virtual_router_id 110
priority 90
advert_int 5
authentication
{
auth_type PASS
auth_pass 1111
}
virtual_ipaddress
{
192.168.88.223
}
track_script
{
chk_mysql
}
}
在node2,node3上启动keepalived
[root@node2 keepalived]# systemctl start keepalived.service
[root@node2 keepalived]# systemctl status keepalived.service
● keepalived.service - LVS and VRRP High Availability Monitor
Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
Active: active (running) since 六 2018-08-18 00:11:15 CST; 2s ago
Process: 3912 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)
Main PID: 3913 (keepalived)
CGroup: /system.slice/keepalived.service
├─3913 /usr/sbin/keepalived -D
├─3914 /usr/sbin/keepalived -D
└─3915 /usr/sbin/keepalived -D
8月 18 00:11:15 node2 Keepalived_vrrp[3915]: Opening file '/etc/keepalived/keepalived.conf'.
8月 18 00:11:15 node2 Keepalived_vrrp[3915]: WARNING - default user 'keepalived_script' for script execution does not exist - please create.
8月 18 00:11:15 node2 Keepalived_vrrp[3915]: VRRP parsed invalid IP {. skipping IP...
8月 18 00:11:15 node2 Keepalived_vrrp[3915]: { no match, ignoring...
8月 18 00:11:15 node2 Keepalived_vrrp[3915]: SECURITY VIOLATION - scripts are being executed but script_security not enabled.
8月 18 00:11:15 node2 Keepalived_vrrp[3915]: VRRP_Instance(VI_1) removing protocol VIPs.
8月 18 00:11:15 node2 Keepalived_vrrp[3915]: Using LinkWatch kernel netlink reflector...
8月 18 00:11:15 node2 Keepalived_vrrp[3915]: VRRP_Instance(VI_1) Entering BACKUP STATE
8月 18 00:11:15 node2 Keepalived_vrrp[3915]: VRRP sockpool: [ifindex(2), proto(112), unicast(0), fd(10,11)]
8月 18 00:11:15 node2 Keepalived_vrrp[3915]: VRRP_Script(chk_mysql) succeeded
[root@node2 keepalived]#
[root@node3 keepalived]# systemctl status keepalived.service
* keepalived.service - LVS and VRRP High Availability Monitor
Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
Active: inactive (dead)
[root@node3 keepalived]# systemctl start keepalived.service
[root@node3 keepalived]#
[root@node3 keepalived]#
[root@node3 keepalived]# systemctl status keepalived.service
* keepalived.service - LVS and VRRP High Availability Monitor
Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
Active: active (running) since 1 2018-08-18 00:10:08 CST; 2s ago
Process: 3665 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)
Main PID: 3666 (keepalived)
CGroup: /system.slice/keepalived.service
|-3666 /usr/sbin/keepalived -D
|-3667 /usr/sbin/keepalived -D
`-3668 /usr/sbin/keepalived -D
日志
8? 18 00:10:08 node3 Keepalived_vrrp[3668]: WARNING - default user 'keepalived_script' for script execution does not exist - please create.
8? 18 00:10:08 node3 Keepalived_vrrp[3668]: VRRP parsed invalid IP {. skipping IP...
8? 18 00:10:08 node3 Keepalived_vrrp[3668]: { no match, ignoring...
8? 18 00:10:08 node3 Keepalived_vrrp[3668]: SECURITY VIOLATION - scripts are being executed but script_security not enabled.
8? 18 00:10:08 node3 Keepalived_vrrp[3668]: VRRP_Instance(VI_1) removing protocol VIPs.
8? 18 00:10:08 node3 Keepalived_vrrp[3668]: Using LinkWatch kernel netlink reflector...
8? 18 00:10:08 node3 Keepalived_vrrp[3668]: VRRP_Instance(VI_1) Entering BACKUP STATE
8? 18 00:10:08 node3 Keepalived_vrrp[3668]: VRRP sockpool: [ifindex(2), proto(112), unicast(0), fd(10,11)]
8? 18 00:10:08 node3 Keepalived_vrrp[3668]: VRRP_Script(chk_mysql) succeeded
8? 18 00:10:08 node3 Keepalived_healthcheckers[3667]: Opening file '/etc/keepalived/keepalived.conf'.
vip已经挂载优先级高的节点上
[root@node3 keepalived]# ip addr show
1: lo:
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: eth0:
link/ether 52:54:00:cd:d4:6d brd ff:ff:ff:ff:ff:ff
inet 192.168.88.19/24 brd 192.168.88.255 scope global eth0
valid_lft forever preferred_lft forever
inet 192.168.88.223/32 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::5054:ff:fecd:d46d/64 scope link
valid_lft forever preferred_lft forever
3: docker0:
link/ether 02:42:b7:c9:1b:76 brd ff:ff:ff:ff:ff:ff
inet 172.17.0.1/16 scope global docker0
valid_lft forever preferred_lft forever
测试从node2 切换到node3
[root@node2 ~]# ip addr show
1: lo:
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: eth0:
link/ether 52:54:00:82:9a:e9 brd ff:ff:ff:ff:ff:ff
inet 192.168.88.18/24 brd 192.168.88.255 scope global eth0
valid_lft forever preferred_lft forever
inet 192.168.88.223/32 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::5054:ff:fe82:9ae9/64 scope link
valid_lft forever preferred_lft forever
[root@node2 ~]#
停止node2上的mysql
[root@node2 ~]# mysqladmin -uroot -proot001 -P3381 -S /home/mysqlkeepalived/mysql.sock shutdown
[root@node2 ~]#
[root@node2 ~]#
node2上的vip已经卸载
[root@node2 ~]# ip addr show
1: lo:
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: eth0:
link/ether 52:54:00:82:9a:e9 brd ff:ff:ff:ff:ff:ff
inet 192.168.88.18/24 brd 192.168.88.255 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::5054:ff:fe82:9ae9/64 scope link
valid_lft forever preferred_lft forever
[root@node2 ~]#
[root@node3 ~]# systemctl status keepalived
* keepalived.service - LVS and VRRP High Availability Monitor
Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
Active: active (running) since 1 2018-08-18 12:01:34 CST; 12min ago
Process: 4877 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)
Main PID: 4878 (keepalived)
CGroup: /system.slice/keepalived.service
|-4878 /usr/sbin/keepalived -D
|-4879 /usr/sbin/keepalived -D
`-4880 /usr/sbin/keepalived -D
8? 18 12:01:34 node3 Keepalived_vrrp[4880]: Opening file '/etc/keepalived/keepalived.conf'.
8? 18 12:01:34 node3 Keepalived_vrrp[4880]: WARNING - default user 'keepalived_script' for script execution does not exist - please create.
8? 18 12:01:34 node3 Keepalived_vrrp[4880]: VRRP parsed invalid IP {. skipping IP...
8? 18 12:01:34 node3 Keepalived_vrrp[4880]: { no match, ignoring...
8? 18 12:01:34 node3 Keepalived_vrrp[4880]: SECURITY VIOLATION - scripts are being executed but script_security not enabled.
8? 18 12:01:34 node3 Keepalived_vrrp[4880]: VRRP_Instance(VI_1) removing protocol VIPs.
8? 18 12:01:34 node3 Keepalived_vrrp[4880]: Using LinkWatch kernel netlink reflector...
8? 18 12:01:34 node3 Keepalived_vrrp[4880]: VRRP_Instance(VI_1) Entering BACKUP STATE
8? 18 12:01:34 node3 Keepalived_vrrp[4880]: VRRP sockpool: [ifindex(2), proto(112), unicast(0), fd(10,11)]
8? 18 12:01:34 node3 Keepalived_vrrp[4880]: VRRP_Script(chk_mysql) succeeded
[root@node3 ~]# tail -f /var/log/messages
Aug 18 12:01:34 node3 Keepalived_vrrp[4880]: Opening file '/etc/keepalived/keepalived.conf'.
Aug 18 12:01:34 node3 Keepalived_vrrp[4880]: WARNING - default user 'keepalived_script' for script execution does not exist - please create.
Aug 18 12:01:34 node3 Keepalived_vrrp[4880]: VRRP parsed invalid IP {. skipping IP...
Aug 18 12:01:34 node3 Keepalived_vrrp[4880]: { no match, ignoring...
Aug 18 12:01:34 node3 Keepalived_vrrp[4880]: SECURITY VIOLATION - scripts are being executed but script_security not enabled.
Aug 18 12:01:34 node3 Keepalived_vrrp[4880]: VRRP_Instance(VI_1) removing protocol VIPs.
Aug 18 12:01:34 node3 Keepalived_vrrp[4880]: Using LinkWatch kernel netlink reflector...
Aug 18 12:01:34 node3 Keepalived_vrrp[4880]: VRRP_Instance(VI_1) Entering BACKUP STATE
Aug 18 12:01:34 node3 Keepalived_vrrp[4880]: VRRP sockpool: [ifindex(2), proto(112), unicast(0), fd(10,11)]
Aug 18 12:01:34 node3 Keepalived_vrrp[4880]: VRRP_Script(chk_mysql) succeeded
keepalived的日志
Aug 18 12:14:38 node3 Keepalived_vrrp[4880]: VRRP_Instance(VI_1) Transition to MASTER STATE
Aug 18 12:14:43 node3 Keepalived_vrrp[4880]: VRRP_Instance(VI_1) Entering MASTER STATE
Aug 18 12:14:43 node3 Keepalived_vrrp[4880]: VRRP_Instance(VI_1) setting protocol VIPs.
Aug 18 12:14:43 node3 Keepalived_vrrp[4880]: Sending gratuitous ARP on eth0 for 192.168.88.223
Aug 18 12:14:43 node3 Keepalived_vrrp[4880]: VRRP_Instance(VI_1) Sending/queueing gratuitous ARPs on eth0 for 192.168.88.223
Aug 18 12:14:43 node3 Keepalived_vrrp[4880]: Sending gratuitous ARP on eth0 for 192.168.88.223
Aug 18 12:14:43 node3 Keepalived_vrrp[4880]: Sending gratuitous ARP on eth0 for 192.168.88.223
Aug 18 12:14:43 node3 Keepalived_vrrp[4880]: Sending gratuitous ARP on eth0 for 192.168.88.223
Aug 18 12:14:43 node3 Keepalived_vrrp[4880]: Sending gratuitous ARP on eth0 for 192.168.88.223
Aug 18 12:14:48 node3 Keepalived_vrrp[4880]: Sending gratuitous ARP on eth0 for 192.168.88.223
Aug 18 12:14:48 node3 Keepalived_vrrp[4880]: VRRP_Instance(VI_1) Sending/queueing gratuitous ARPs on eth0 for 192.168.88.223
Aug 18 12:14:48 node3 Keepalived_vrrp[4880]: Sending gratuitous ARP on eth0 for 192.168.88.223
Aug 18 12:14:48 node3 Keepalived_vrrp[4880]: Sending gratuitous ARP on eth0 for 192.168.88.223
Aug 18 12:14:48 node3 Keepalived_vrrp[4880]: Sending gratuitous ARP on eth0 for 192.168.88.223
Aug 18 12:14:48 node3 Keepalived_vrrp[4880]: Sending gratuitous ARP on eth0 for 192.168.88.223
vip已经挂载到node3上
[root@node3 ~]# ip addr show
1: lo:
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: eth0:
link/ether 52:54:00:cd:d4:6d brd ff:ff:ff:ff:ff:ff
inet 192.168.88.19/24 brd 192.168.88.255 scope global eth0
valid_lft forever preferred_lft forever
inet 192.168.88.223/32 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::5054:ff:fecd:d46d/64 scope link
valid_lft forever preferred_lft forever
3: docker0:
link/ether 02:42:b7:c9:1b:76 brd ff:ff:ff:ff:ff:ff
inet 172.17.0.1/16 scope global docker0
valid_lft forever preferred_lft forever
使用vip登入mysql
[root@node3 ~]# mysql -uroot -p -P3381 -h 192.168.88.223
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 93
Server version: 5.7.22-log MySQL Community Server (GPL)
Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>