keepalived nginx負載安裝

環境：centos7.6

keepalived工具可以生成虛擬浮動ip，繫結到網絡卡上。

172.21.210.19  master

172.21.210.20  backup

172.21.210.30  vip(浮動ip)

1、兩個節點安裝keepalived

yum -y install keepalived

2、確定要繫結的網絡卡（這兒使用eth0）

[root@tool-19 ~]# ip a

1: lo: mtu 65536 qdisc noqueue state unknown group default qlen 1000
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: 
mtu 1500 qdisc pfifo_fast state up group default qlen 1000
link/ether fa:16
:3e:c5:ac:f5 brd ff:ff:ff:ff:ff:ff
inet 
172.21.210.19/25 brd 172.21.210.127 scope global
noprefixroute eth0
valid_lft forever preferred_lft forever
inet6 fe80::f816:3eff:fec5:acf5/64
scope link 
valid_lft forever preferred_lft forever

3、master配置

[root@tool-19 ~]# more /etc/keepalived/keepalived.conf 

! configuration file for
keepalived
global_defs 
vrrp_instance vi_1 
virtual_ipaddress 
}

3、backup節點配置

[root@harbor-20 ~]# more /etc/keepalived/keepalived.conf 

! configuration file for
keepalived
global_defs 
vrrp_instance vi_1 
virtual_ipaddress 
}

4、啟動服務

systemctl enable keepalived && systemctl start keepalived && systemctl status keepalived

5、進行驗證

[root@harbor-20 ~]# ip a

1: lo: mtu 65536 qdisc noqueue state unknown group default qlen 1000
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: 
mtu 1500 qdisc pfifo_fast state up group default qlen 1000
link/ether fa:16:3e:c0:74
:1e brd ff:ff:ff:ff:ff:ff
inet 
172.21.210.20/25 brd 172.21.210.127 scope global
noprefixroute eth0
valid_lft forever preferred_lft forever
inet 
172.21.210.30/25 scope global
secondary eth0
valid_lft forever preferred_lft forever
現在在20上，重啟20的keeplived服務，可以看到ip自動跳轉到19
systemctl restart keepalived

6、配置nginx，兩邊配置一樣服務，每次vip跳轉到該伺服器都是用一樣的nginx，nginx具體的安裝可以參考：

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