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Keepalived如何实现Nginx高可用

【字号: 日期:2023-03-13 15:37:24浏览:2作者:猪猪
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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