Keepalived如何實(shí)現(xiàn)Nginx高可用

更新時(shí)間：2022年10月31日 10:10:07 作者：z.haoui

這篇文章主要介紹了Keepalived如何實(shí)現(xiàn)Nginx高可用，具有很好的參考價(jià)值，希望對(duì)大家有所幫助。如有錯(cuò)誤或未考慮完全的地方，望不吝賜教

Keepalived實(shí)現(xiàn)Nginx高可用

Keepalived安裝可參考Mysql+Keepalived實(shí)現(xiàn)雙主熱備

Master上的keepalived.conf

global_defs {
?? ?router_id LVS_LEVEL1?? ?#主服務(wù)器名稱
}
?
vrrp_script check_run {
? ?script "/usr/local/src/check_nginx.sh"
? ?interval 5?? ??? ??? ??? ?#5秒執(zhí)行一次腳本
}
?
vrrp_instance VI_1 {
? ? state MASTER?? ??? ??? ?#主服務(wù)器
? ? interface eth0?? ??? ??? ?#承載VIP地址到物理接口
? ? virtual_router_id 51?? ?#虛擬路由器ID號(hào)，每個(gè)熱播組保持一致
? ? priority 100?? ??? ??? ?#優(yōu)先級(jí)，數(shù)值越大優(yōu)先級(jí)越高
? ? advert_int 1?? ??? ??? ?#檢查間隔，默認(rèn)為1s
? ? authentication {?? ??? ?#認(rèn)證信息，每個(gè)熱播組保持一致
? ? ? ? auth_type PASS ? ? ?#認(rèn)證類型
? ? ? ? auth_pass 1111?? ??? ?#密碼字串
? ? }
? ? virtual_ipaddress {
? ? ? ? 192.168.0.200?? ??? ?#VIP地址（內(nèi)網(wǎng)地址）
? ? }
? ? track_script {
? ? ? ? check_run
? ? }
}

Backup上的keepalived.conf

global_defs {
?? ?router_id LVS_LEVEL2?? ?#備份服務(wù)器名稱
}
vrrp_script check_run {
?? ?script "/usr/local/src/check_nginx.sh"
?? ?interval 5?? ??? ??? ??? ?#5秒執(zhí)行一次腳本
}
vrrp_instance VI_1 {
? ? state BACKUP?? ??? ??? ?#備份服務(wù)器
? ? interface eth0?? ??? ??? ?#承載VIP地址到物理接口
? ? virtual_router_id 51?? ?#虛擬路由器ID號(hào)，每個(gè)熱播組保持一致
? ? priority 50?? ??? ??? ??? ?#優(yōu)先級(jí)，數(shù)值越大優(yōu)先級(jí)越高
? ? advert_int 1?? ??? ??? ?#檢查間隔，默認(rèn)為1s
? ? authentication {?? ??? ?#認(rèn)證信息，每個(gè)熱播組保持一致
? ? ? ? auth_type PASS ? ? ?#認(rèn)證類型
? ? ? ? auth_pass 1111?? ??? ?#密碼字串
? ? }
? ? virtual_ipaddress {
? ? ? ? 192.168.0.200 ? ? ? #VIP地址（和主服務(wù)器設(shè)置一樣）
? ? }
? ? track_script {
? ? ? ? check_run
? ? }
}

Nginx檢測腳本check_nginx.sh

#!/bin/bash
?
A=`ps -C nginx --no-header |wc -l`
#判斷nginx是否宕機(jī)，如果宕機(jī)，嘗試重啟
if [ $A -eq 0 ];then
? ? /usr/local/nginx/sbin/nginx
? ? #等待一會(huì)再次檢查nginx，如果沒有啟動(dòng)成功，則停止keepalived，使其啟動(dòng)備用機(jī)
? ? sleep 5
? ? if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
? ? ? ? killall keepalived
? ? fi
fi

chmod +x /etc/keepalived/nginx_check.sh

Keepalived+Nginx高可用集群

實(shí)驗(yàn)環(huán)境

準(zhǔn)備2臺(tái)設(shè)備

設(shè)備1 192.168.217.11 nginx +keepalived

設(shè)備2 192.168.217.12 nginx +keepalived

虛擬ip 192.168.217.3

設(shè)備1、2 安裝nginx keepalived

（此處設(shè)備已安裝nginx）

我們?cè)诖嘶A(chǔ)上直接利用yum安裝keepalived

更新網(wǎng)絡(luò)yum源

[root@localhost ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
[root@localhost ~]# wget -O /etc/yum.repos.d/epel-7.repo http://mirrors.aliyun.com/repo/epel-7.repo
--2022-06-11 17:56:31-- ?http://mirrors.aliyun.com/repo/epel-7.repo

安裝keepalived

[root@localhost ~]# yum -y install keepalived.x86_64?

啟動(dòng)nginx

[root@localhost ~]# cd /usr/src/nginx-1.12.2/
[root@localhost nginx-1.12.2]# killall -9 nginx
[root@localhost nginx-1.12.2]# nginx

修改keepalived配置文件

[root@localhost nginx-1.12.2]# vim /etc/keepalived/keepalived.conf?
vrrp_instance VI_1 { ??
? ? state BACKUP ? ? ? ? ? ?#主調(diào)度器的初始角色（本實(shí)驗(yàn)主備MASTER 從BACKUP）
? ? interface ens33 ? ? ? ? ? ?#修改網(wǎng)卡名稱
? ? virtual_router_id 52 ? ? ?#主id 與從id ?不要重復(fù) ? ??
? ? priority 90 ? ? ? ? ? ? ? ? #主調(diào)度器的選舉優(yōu)先級(jí) ? （本實(shí)驗(yàn) ?主備100 ?從90 ?數(shù)據(jù)越大 優(yōu)先級(jí)越高）
? ? advert_int 1 ? ? ? ? ? ?
? ? authentication {
? ? ? ? auth_type PASS
? ? ? ? auth_pass 1111
? ? }
? ? virtual_ipaddress {
? ? ? ? 192.168.217.3 ? ? ? ? ? ? ? ? ? ? ?#虛擬ip ? （本實(shí)驗(yàn)需設(shè)置 ?同網(wǎng)段 ?主從一樣）
? ? }
}

查看ip

[root@localhost ~]# ip a
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
? ? link/ether 00:0c:29:c2:15:cf brd ff:ff:ff:ff:ff:ff
? ? inet 192.168.217.11/24 brd 192.168.217.255 scope global noprefixroute ens33
? ? ? ?valid_lft forever preferred_lft forever
? ? inet 192.168.217.3/32 scope global ens33
? ? ? ?valid_lft forever preferred_lft forever
? ? inet6 fe80::1e6f:d3ee:5554:1f34/64 scope link tentative noprefixroute dadfailed?
? ? ? ?valid_lft forever preferred_lft forever
? ? inet6 fe80::ac8:77ad:9154:7983/64 scope link noprefixroute?
? ? ? ?valid_lft forever preferred_lft forever

重啟keepalived

[root@localhost ~]# systemctl start keepalived.service
[root@localhost ~]# systemctl restart keepalived.service

關(guān)閉防火墻內(nèi)核

[root@localhost ~]# systemctl stop firewalld
[root@localhost ~]# setenforce 0

驗(yàn)證

[root@localhost ~]# curl 192.168.217.11
‘nginx1'
[root@localhost ~]# curl 192.168.217.12
‘nginx2'
[root@localhost ~]# curl 192.168.217.3
‘nginx1'
[root@localhost ~]# curl 192.168.217.3
‘nginx1'

實(shí)驗(yàn)環(huán)境

準(zhǔn)備2臺(tái)設(shè)備雙主keepalived

設(shè)備1 192.168.217.11 nginx +keepalived

設(shè)備2 192.168.217.12 nginx +keepalived

虛擬ip 192.168.217.3

虛擬ip 192.168.217.6

在以上實(shí)驗(yàn)基礎(chǔ)上

設(shè)備1

[root@localhost ~]# vim /etc/keepalived/keepalived.conf 
vrrp_instance VI_1 {     #修改模塊名字
    state MASTER     #主調(diào)度器的初始角色（本實(shí)驗(yàn)主備MASTER 從BACKUP）
    interface ens33      #修改網(wǎng)卡名稱
    virtual_router_id 51       #主id 與從id  不要重復(fù)     
    priority 100           #主調(diào)度器的選舉優(yōu)先級(jí)   （本實(shí)驗(yàn)  主備100  從90  數(shù)據(jù)越大 優(yōu)先級(jí)越高）
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.217.3            #虛擬ip   
    }
}


vrrp_instance VI_2 {
    state BACKUP
    interface ens33
    virtual_router_id 53
    priority 90	
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.217.6              
    }
I}

設(shè)備2

[root@localhost ~]# vim /etc/keepalived/keepalived.conf 
vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 51
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.217.3
    }
}

vrrp_instance VI_2 {
    state MASTER
    interface ens33
    virtual_router_id 53
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.217.6
    }
}

xshell同時(shí)開啟命令模式重啟keepalived

[root@localhost ~]# systemctl start keepalived.service
[root@localhost ~]# systemctl restart keepalived.service

查看ip

設(shè)備1 飄逸Ip正常

[root@localhost ~]# ip a
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:c2:15:cf brd ff:ff:ff:ff:ff:ff
    inet 192.168.217.11/24 brd 192.168.217.255 scope global noprefixroute ens33
       valid_lft forever preferred_lft forever
    inet 192.168.217.3/32 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::1e6f:d3ee:5554:1f34/64 scope link tentative noprefixroute dadfailed 
       valid_lft forever preferred_lft forever
    inet6 fe80::ac8:77ad:9154:7983/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

設(shè)備2

[root@localhost ~]# ip a
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:49:b3:a1 brd ff:ff:ff:ff:ff:ff
    inet 192.168.217.12/24 brd 192.168.217.255 scope global noprefixroute ens33
       valid_lft forever preferred_lft forever
    inet 192.168.217.6/32 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::1e6f:d3ee:5554:1f34/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

設(shè)備1、設(shè)備2驗(yàn)證（此問題暫未解決）

[root@localhost ~]# curl 192.168.217.11
curl: (7) Failed connect to 192.168.217.11:80; 拒絕連接
[root@localhost ~]# curl 192.168.217.12
‘nginx2'
[root@localhost ~]# curl 192.168.217.3
curl: (7) Failed connect to 192.168.217.3:80; 連接超時(shí)
[root@localhost ~]# curl 192.168.217.6
curl: (7) Failed connect to 192.168.217.6:80; 連接超時(shí)

以上為個(gè)人經(jīng)驗(yàn)，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。

您可能感興趣的文章: