keepalived nginx 高可用集群

nginx做負載均衡，能達到分發請求的目的，但是不能很好的避免單點故障。

$ tcpdump -nn -vvv -i ens33 vrrp #檢視組播的包 192.168.31.40 > 224.0.0.18: vrrp 192.168.31.40 > 224.0.0.18: vrrpv2, advertisement, vrid 51, prio 100, authtype ******, intvl 1s, length 20, addrs: 192.168.31.213 auth "1111^￥##"

輸出解析：192.168.31.40是master，目標位址是224.0.0.18，使用的協議是vrrpv2版本，虛擬id是51，優先順序是100，簡單驗證型別，一秒發一次，長度20位元組，虛ip是192.168.31.213，驗證的密碼是111#$z%#

$ wget

使用如下shell指令碼keepalived_instll.sh安裝keepalived軟體。

$ sh keepalived_install.sh #keepalived安裝指令碼 #!/bin/bash pkg=keepalived-2.0.8.tar.gz tar xf $pkg yum -y install kernel-devel ln -s /usr/src/kernels/3.10.0-862.14.4.el7.x86_64/ /usr/src/linux cd keepalived-2.0.8/ yum install openssl-* -y ./configure --prefix=/usr/local/keepalived make make install mkdir -pv /etc/keepalived cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

ln -s /usr/local/keepalived/sbin/keepalived /sbin/

$ systemctl start keepalived

主機名

ip角色

系統配置

軟體master.ayitula.com

192.168.31.40

主分發器

centos7.5

2核4g

nginx+keepalived

backup.ayitula.com

192.168.31.41

備分發器

centos7.5

2核4g

nginx+keepalived

web01.ayitula.com

192.168.31.42

資料伺服器1

centos7.5

2核4g

nginx

web02.ayitula.com

192.168.31.43

資料伺服器2

centos7.5

2核4g

nginx

1）分發器：nginx+keepalived

2）資料伺服器：nginx

3）配置nginx分發器

4）配置資料伺服器頁面（web01 web02）

5）配置keepalived.conf

6）測試

upstream web 
server 
}

（1）主分發器keepalived

! configuration file for keepalived global_defs vrrp_script check_nginx vrrp_instance nginx track_script virtual_ipaddress

}

（2）備分發器keepalived

#cat /etc/keepalived/keepalived.conf ! configuration file for keepalived global_defs vrrp_script check_nginx vrrp_instance nginx track_script virtual_ipaddress

}

#!/bin/bash
nginx_kp_check () 
nginx_kp_check

指令碼原理：該指令碼檢查nginx程序是否存在，如果程序沒了，說明分發器掛了，嘗試啟動分發器，1秒後檢查分發器啟動沒有，如果沒有啟動直接關閉keepalived，停止發組播，備就自動開始工作了。

分發器由keepalived來管理

$ watch  -n1 killall nginx    # 每隔一秒殺死一次所有nginx

資料伺服器則由nginx來管理。使用如下兩個引數就可實現對資料伺服器管理：

upstream web

posted @

2018-12-24 23:36

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keepalived nginx 高可用集群

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keepalived nginx負載安裝

keepalived nginx 高可用集群

keepalived nginx主從切換

keepalived nginx集群部署

keepalived nginx負載安裝

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