nginx keepalived高可用集群主从模式

hostname	ip	说明
proxy-01	172.0.5.108	keepalived主节点nginx主负载均衡
proxy-02	172.0.5.39	keepalived备节点nginx辅负载均衡
VIP	172.0.5.199	客户机

1、在所有节点上配置

# systemctl stop firewalld         //关闭防火墙
# sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/sysconfig/selinux    //关闭selinux，重启生效
# setenforce 0        　　　　　　　　//关闭selinux，临时生效
# ntpdate 0.centos.pool.ntp.org    //时间同步
# yum install nginx -y        　　　//安装nginx

2、在两个节点上安装nginx

安装步骤参考：Liunx 安装Nginx

3、安装keepalived

yum install -y keepalived

4、修改两个节点的hosts

[root@172-0-5-239 keepalived]# vim /etc/hosts
[root@172-0-5-239 keepalived]# 127.0.0.1   proxy-01
[root@172-0-5-108 keepalived]# vim /etc/hosts
[root@172-0-5-108 keepalived]# 127.0.0.1   proxy-02

5、防止脑裂产生问题，主备都采用不争抢模式nopreempt

且本质为先启动的keepalived节点即为主节点

! Configuration File for keepalivedglobal_defs {router_id edu-proxy-01
}vrrp_instance VI_1 {state BACKUP            #主备都是backupnopreempt                #备没有这个interface ens33virtual_router_id 51mcast_src_ip 172.0.5.239priority 110            #备要小于110advert_int 1authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {172.0.5.199/24 dev ens33 label ens33:1}
}
virtual_server 172.0.5.199 80 {delay_loop 3lb_algo rrlb_kind DR# persistence_timeout 1protocol TCPreal_server 172.0.5.239 80 {weight 1TCP_CHECK {connect_timeout 10nb_get_retry 3delay_before_retry 3connect_port 80}}real_server 172.0.5.108 80 {weight 1TCP_CHECK {connect_timeout 10nb_get_retry 3delay_before_retry 3connect_port 80}}
}

6、启动keepalived并加入开机自启、查看keepalived状态

systemctl start keepalived
systemctl enable keepalived
systemctl status keepalived

7、查看ip，主节点多了inet 172.0.5.199/24 scope global secondary ens33:1

[root@172-0-5-239 sbin]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8 scope host lovalid_lft forever preferred_lft foreverinet6 ::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 1000link/ether 00:0c:29:58:8f:95 brd ff:ff:ff:ff:ff:ffinet 172.0.5.239/24 brd 172.0.5.255 scope global dynamic ens33valid_lft 72248sec preferred_lft 72248secinet 172.0.5.199/24 scope global secondary ens33:1valid_lft forever preferred_lft foreverinet6 fe80::c64c:250:9d45:6317/64 scope link valid_lft forever preferred_lft forever
[root@172-0-5-239 sbin]# 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8 scope host lovalid_lft forever preferred_lft foreverinet6 ::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 1000link/ether 00:0c:29:a3:1b:55 brd ff:ff:ff:ff:ff:ffinet 172.0.5.108/24 brd 172.0.5.255 scope global dynamic ens33valid_lft 72209sec preferred_lft 72209secinet6 fe80::393e:4b07:bc68:157f/64 scope link valid_lft forever preferred_lft forever
[root@172-0-5-108 keepalived]#

8、通过虚拟VIP访问

9、当主节点keepalived挂了之后，虚拟VIP会飘到备用keepalived节点上

[root@172-0-5-108 keepalived]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8 scope host lovalid_lft forever preferred_lft foreverinet6 ::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 1000link/ether 00:0c:29:a3:1b:55 brd ff:ff:ff:ff:ff:ffinet 172.0.5.108/24 brd 172.0.5.255 scope global dynamic ens33valid_lft 72087sec preferred_lft 72087secinet 172.0.5.199/24 scope global secondary ens33:1valid_lft forever preferred_lft foreverinet6 fe80::393e:4b07:bc68:157f/64 scope link valid_lft forever preferred_lft forever
[root@172-0-5-108 keepalived]#

10、检测nginx脚本

[root@172-0-5-108 nginx]# cat chk_web.sh
#!/bin/bash
while true
do
if [ `ps -ef | grep nginx | grep -v grep | wc -l`  -lt 2 ]thensystemctl stop keepalived
fi
sleep 10
done[root@172-0-5-108 nginx]# chmod 755 chk_web.sh [root@172-0-5-108 nginx]# sh chk_web.sh &

参考链接：

企业级Nginx负载均衡与keepalived高可用实战视频教程

Nginx-keepalived+Nginx实现高可用集群

split-brain 脑裂问题（Keepalived）

18.3/18.4/18.5 用keepalived配置高可用集群

keepalived的抢占与非抢占模式

keepalived之vrrp_script详解

高可用实践——Keepalived踩坑记录

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