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Keepalived如何实现Nginx高可用

浏览：18日期：2023-03-28 17:34:49
目录
  • Keepalived实现Nginx高可用
    • Master上的keepalived.conf
    • Backup上的keepalived.conf
    • Nginx检测脚本check_nginx.sh
  • Keepalived+Nginx高可用集群

    Keepalived实现Nginx高可用

    Keepalived安装可参考Mysql+Keepalived实现双主热备

    Master上的keepalived.conf

    global_defs {
?? ?router_id LVS_LEVEL1?? ?#主服务器名称
}
?
vrrp_script check_run {
? ?script "/usr/local/src/check_nginx.sh"
? ?interval 5?? ??? ??? ??? ?#5秒执行一次脚本
}
?
vrrp_instance VI_1 {
? ? state MASTER?? ??? ??? ?#主服务器
? ? interface eth0?? ??? ??? ?#承载VIP地址到物理接口
? ? virtual_router_id 51?? ?#虚拟路由器ID号，每个热播组保持一致
? ? priority 100?? ??? ??? ?#优先级，数值越大优先级越高
? ? advert_int 1?? ??? ??? ?#检查间隔，默认为1s
? ? authentication {?? ??? ?#认证信息，每个热播组保持一致
? ? ? ? auth_type PASS ? ? ?#认证类型
? ? ? ? auth_pass 1111?? ??? ?#密码字串
? ? }
? ? virtual_ipaddress {
? ? ? ? 192.168.0.200?? ??? ?#VIP地址（内网地址）
? ? }
? ? track_script {
? ? ? ? check_run
? ? }
}

    Backup上的keepalived.conf

    global_defs {
?? ?router_id LVS_LEVEL2?? ?#备份服务器名称
}
vrrp_script check_run {
?? ?script "/usr/local/src/check_nginx.sh"
?? ?interval 5?? ??? ??? ??? ?#5秒执行一次脚本
}
vrrp_instance VI_1 {
? ? state BACKUP?? ??? ??? ?#备份服务器
? ? interface eth0?? ??? ??? ?#承载VIP地址到物理接口
? ? virtual_router_id 51?? ?#虚拟路由器ID号，每个热播组保持一致
? ? priority 50?? ??? ??? ??? ?#优先级，数值越大优先级越高
? ? advert_int 1?? ??? ??? ?#检查间隔，默认为1s
? ? authentication {?? ??? ?#认证信息，每个热播组保持一致
? ? ? ? auth_type PASS ? ? ?#认证类型
? ? ? ? auth_pass 1111?? ??? ?#密码字串
? ? }
? ? virtual_ipaddress {
? ? ? ? 192.168.0.200 ? ? ? #VIP地址（和主服务器设置一样）
? ? }
? ? track_script {
? ? ? ? check_run
? ? }
}

    Nginx检测脚本check_nginx.sh

    #!/bin/bash
?
A=`ps -C nginx --no-header |wc -l`
#判断nginx是否宕机，如果宕机，尝试重启
if [ $A -eq 0 ];then
? ? /usr/local/nginx/sbin/nginx
? ? #等待一会再次检查nginx，如果没有启动成功，则停止keepalived，使其启动备用机
? ? 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

    实验环境

    准备2台设备

    设备1 192.168.217.11 nginx +keepalived

    设备2 192.168.217.12 nginx +keepalived

    虚拟ip 192.168.217.3

    设备1、2 安装nginx keepalived

    （此处设备已安装nginx）

    我们在此基础上直接利用yum安装keepalived

    更新网络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

    安装keepalived

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

    启动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 ? ? ? ? ? ?#主调度器的初始角色（本实验主备MASTER 从BACKUP）
? ? interface ens33 ? ? ? ? ? ?#修改网卡名称
? ? virtual_router_id 52 ? ? ?#主id 与从id ?不要重复 ? ??
? ? priority 90 ? ? ? ? ? ? ? ? #主调度器的选举优先级 ? （本实验 ?主备100 ?从90 ?数据越大 优先级越高）
? ? advert_int 1 ? ? ? ? ? ?
? ? authentication {
? ? ? ? auth_type PASS
? ? ? ? auth_pass 1111
? ? }
? ? virtual_ipaddress {
? ? ? ? 192.168.217.3 ? ? ? ? ? ? ? ? ? ? ?#虚拟ip ? （本实验需设置 ?同网段 ?主从一样）
? ? }
}

    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

    重启keepalived

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

    关闭防火墙 内核

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

    验证

    [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"

    实验环境

    准备2台设备 双主keepalived

    设备1 192.168.217.11 nginx +keepalived

    设备2 192.168.217.12 nginx +keepalived

    虚拟ip 192.168.217.3

    虚拟ip 192.168.217.6

    在以上实验基础上

    设备1

    [root@localhost ~]# vim /etc/keepalived/keepalived.conf 
vrrp_instance VI_1 {     #修改模块名字
    state MASTER     #主调度器的初始角色（本实验主备MASTER 从BACKUP）
    interface ens33      #修改网卡名称
    virtual_router_id 51       #主id 与从id  不要重复     
    priority 100           #主调度器的选举优先级   （本实验  主备100  从90  数据越大 优先级越高）
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.217.3            #虚拟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}

    设备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同时开启 命令模式 重启keepalived

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

    查看ip

    设备1 飘逸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

    设备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

    设备1、设备2验证 （此问题暂未解决）

    [root@localhost ~]# curl 192.168.217.11
curl: (7) Failed connect to 192.168.217.11:80; 拒绝连接
[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; 连接超时
[root@localhost ~]# curl 192.168.217.6
curl: (7) Failed connect to 192.168.217.6:80; 连接超时

    以上为个人经验，希望能给大家一个参考，也希望大家多多支持。

    标签： Nginx
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