keepalived配置高可用集群
准备工作分别在主从上安装keepalived和nginx
yum install -y keepalived
yum install -y nginx
关闭主从上的防火墙和SELinux
systemctl stop firewalld
setenforce 0
配置主机
查看主机ip
# ifconfig
ens33: flags=4163mtu 1500
inet 192.168.130.116netmask 255.255.255.0broadcast 192.168.130.255
inet6 fe80::181c:4847:3f62:dc4cprefixlen 64scopeid 0x20
ether 00:0c:29:60:ed:4atxqueuelen 1000(Ethernet)
RX packets 11701bytes 10394449 (9.9 MiB)
RX errors 0dropped 0overruns 0frame 0
TX packets 13559bytes 972155 (949.3 KiB)
TX errors 0dropped 0 overruns 0carrier 0collisions 0
lo: flags=73mtu 65536
inet 127.0.0.1netmask 255.0.0.0
inet6 ::1prefixlen 128scopeid 0x10
looptxqueuelen 1(Local Loopback)
RX packets 86bytes 6720 (6.5 KiB)
RX errors 0dropped 0overruns 0frame 0
TX packets 86bytes 6720 (6.5 KiB)
TX errors 0dropped 0 overruns 0carrier 0collisions 0
清空主上keepalived配置文件/etc/keepalived/keepalived.conf
# > /etc/keepalived/keepalived.conf
编辑主上配置文件/etc/keepalived/keepalived.conf
# vim /etc/keepalived/keepalived.conf
加入以下内容：
global_defs {
notification_email {
aming@aminglinux.com
}
notification_email_from root@aminglinux.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_script chk_nginx {
script "/usr/local/sbin/check_ng.sh"
interval 3
}
vrrp_instance VI_1 {
state MASTER
interface ens33
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass aminglinux>com
}
virtual_ipaddress {
192.168.130.100
}
track_script {
chk_nginx
}
}
定义主上监控脚本/usr/local/sbin/check_ng.sh
# vim /usr/local/sbin/check_ng.sh
写入下面内容
#!/bin/bash
#时间变量，用于记录日志
d=`date --date today +%Y%m%d_%H:%M:%S`
#计算nginx进程数量
n=`ps -C nginx --no-heading|wc -l`
#如果进程为0，则启动nginx，并且再次检测nginx进程数量，
#如果还为0，说明nginx无法启动，此时需要关闭keepalived
if [ $n -eq "0" ]; then
/etc/init.d/nginx start
n2=`ps -C nginx --no-heading|wc -l`
if [ $n2 -eq "0"]; then
echo "$d nginx down,keepalived will stop" >> /var/log/check_ng.log
systemctl stop keepalived
fi
fi
更改主上/usr/local/sbin/check_ng.sh权限
# chmod 755 /usr/local/sbin/check_ng.sh
启动主上keepalived
# systemctl start keepalived
# ps aux |grep keepalived
root 17410.00.1 1207401404 ? Ss 10:46 0:00 /usr/sbin/keepalived -D
root 17420.00.3 1274763260 ? S 10:46 0:00 /usr/sbin/keepalived -D
root 17450.00.3 1317803116 ? S 10:46 0:00 /usr/sbin/keepalived -D
root 17990.00.0 112676 988 pts/0 S+ 10:47 0:00 grep --color=auto keepalived
为了区分主从的nginx需要把nginx的默认页做个标记
# echo master > /data/wwwroot/default/index.html
在另一台机器使用从ip访问
得到下面结果
# curl 192.168.130.116
master
配置从机
查看从机ip
# ifconfig
ens33: flags=4163mtu 1500
inet 192.168.130.128netmask 255.255.255.0broadcast 192.168.130.255
inet6 fe80::fef6:fd37:2682:fabcprefixlen 64scopeid 0x20
ether 00:0c:29:af:03:e8txqueuelen 1000(Ethernet)
RX packets 45666bytes 48434560 (46.1 MiB)
RX errors 0dropped 0overruns 0frame 0
TX packets 14753bytes 1287938 (1.2 MiB)
TX errors 0dropped 0 overruns 0carrier 0collisions 0
lo: flags=73mtu 65536
inet 127.0.0.1netmask 255.0.0.0
inet6 ::1prefixlen 128scopeid 0x10
looptxqueuelen 1(Local Loopback)
RX packets 80bytes 6256 (6.1 KiB)
RX errors 0dropped 0overruns 0frame 0
TX packets 80bytes 6256 (6.1 KiB)
TX errors 0dropped 0 overruns 0carrier 0collisions 0
清空从上配置文件/etc/keepalived/keepalived.conf
# > /etc/keepalived/keepalived.conf
编辑从上配置文件/etc/keepalived/keepalived.conf
# vim /etc/keepalived/keepalived.conf
加入下面内容
global_defs {
notification_email {
aming@aminglinux.com
}
notification_email_from root@aminglinux.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_script chk_nginx {
script "/usr/local/sbin/check_ng.sh"
interval 3
}
vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id 51
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass aminglinux>com
}
virtual_ipaddress {
192.168.130.100
}
track_script {
chk_nginx
}
}
定义从上监控脚本/usr/local/sbin/check_ng.sh
# vim /usr/local/sbin/check_ng.sh
加入下面内容
#时间变量，用于记录日志
d=`date --date today +%Y%m%d_%H:%M:%S`
#计算nginx进程数量
n=`ps -C nginx --no-heading|wc -l`
#如果进程为0，则启动nginx，并且再次检测nginx进程数量，
#如果还为0，说明nginx无法启动，此时需要关闭keepalived
if [ $n -eq "0" ]; then
systemctl start nginx
n2=`ps -C nginx --no-heading|wc -l`
if [ $n2 -eq "0"]; then
echo "$d nginx down,keepalived will stop" >> /var/log/check_ng.log
systemctl stop keepalived
fi
fi
更改从上/usr/local/sbin/check_ng.sh权限
# chmod 755 /usr/local/sbin/check_ng.sh
启动从上keepalived
# systemctl start keepalived
# ps aux |grep keepalived
root 35890.00.1 1207401400 ? Ss 11:03 0:00 /usr/sbin/keepalived -D
root 35900.00.3 1274763260 ? S 11:03 0:00 /usr/sbin/keepalived -D
root 35910.00.3 1317803124 ? S 11:03 0:00 /usr/sbin/keepalived -D
root 36800.00.0 112676 988 pts/0 S+ 11:03 0:00 grep --color=auto keepalived
为了区分主从的nginx需要把nginx的默认页做个标记
# echo backup > /usr/share/nginx/html/index.html
在另一台机器使用从ip访问
得到下面结果
# curl 192.168.130.128
backup
测试高可用
首先在主从keepalived都开启的情况
下查看得到vip在主机上 使用另一台机器通过vip访问得到master
然后在主机keepalived关闭的情况下查看得到vip在从机上 使用另一台机器通过vip访问得到backup
再次开启主机的keepalived情况下查看得到vip又回到主机上 使用另一台机器通过vip访问得到master
不是吧不能看 111 很详细，谢谢分享！
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