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三主热备架构

news 来源：原创 2025/4/28 3:02:09

1.要求

在这里插入图片描述

角色	主机名	软件	IP地址
用户	client		192.168.72.90
keepalived	vip		192.168.72.100
master	serverA	keepalived, nginx	192.168.72.30
backup	serverB	keepalived, nginx	192.168.72.31
backup	serverC	keepalived, nginx	192.168.72.32
web	tomcat1	tomcat	192.168.72.41
web	tomcat2	tomcat	192.168.72.42
web	tomcat3	tomcat	192.168.72.43
DNS轮询	dns	nginx	192.168.72.11

2.环境准备

2.1修改主机名和ip地址
web：

hostnamectl hostname tomact1
nmcli c modify ens160 ipv4.method manual ipv4.address 192.168.72.41 ipv4.gateway 192.168.72.2 ipv4.dns 223.5.5.5 connection.autoconnect yes
hostnamectl hostname tomact2
nmcli c modify ens160 ipv4.method manual ipv4.address 192.168.72.42 ipv4.gateway 192.168.72.2 ipv4.dns 
223.5.5.5 connection.autoconnect yes
hostnamectl hostname tomact3
nmcli c modify ens160 ipv4.method manual ipv4.address 192.168.72.42 ipv4.gateway 192.168.72.2 ipv4.dns 
223.5.5.5 connection.autoconnect yes

master:

hostnamectl hostname master
nmcli c modify ens160 ipv4.method manual ipv4.address 192.168.72.30 ipv4.gateway 192.168.72.2 ipv4.dns 223.5.5.5 connection.autoconnect yes

bacup1:

hostnamectl hostname backup1
nmcli c modify ens160 ipv4.method manual ipv4.address 192.168.72.31 ipv4.gateway 192.168.72.2 ipv4.dns 223.5.5.5 connection.autoconnect yes

backup2:

hostnamectl hostname tomact1
nmcli c modify ens160 ipv4.method manual ipv4.address 192.168.72.32 ipv4.gateway 192.168.72.2 ipv4.dns 223.5.5.5 connection.autoconnect yes

dns:

hostnamectl hostname dns
nmcli c modify ens160 ipv4.method manual ipv4.address 192.168.72.11 ipv4.gateway 192.168.72.2 ipv4.dns 223.5.5.5 connection.autoconnect yes

2.2配置仓库(所有虚拟机)

[BaseOS]
name=BaseOS
baseurl=/mnt/BaseOS
gpgcheck=0
[AppStream]
name=AppStream
baseurl=/mnt/AppStream
gpgcheck=0

2.3挂载仓库(所有虚拟机)

mount /dev/sr0 /mnt

2.4关闭防火墙和selinux(所有虚拟机)

systemctl stop firewalld
setenforce 0

3.配置tomact服务

3.1下载tomact
官网：https://tomcat.apache.org/
tomact1:

wgt  https://dlcdn.apache.org/tomcat/tomcat-11/v11.0.5/bin/apache-tomcat-11.0.5.tar.gz
ls

apache-tomcat-11.0.5.tar.gz

3.2解压并配置环境

tar -xzf apache-tomcat-11.0.5.tar.gz -C /usr/local
vim /etc/profile
export TOMACT_HOME=/usr/local/apache-tomcat-11.0.5
export PAHT=$PATH:$TOMACT_HOME/bin

3.3下载jdk
官网：https://www.oracle.com

wget  https://download.oracle.com/java/21/latest/jdk-21_linux-x64_bin.tar.gz
ls jdk-21_linux-x64_bin.tar.gz

3.4 解压并配置环境

tar- xzf jdk-21_linux-x64_bin.tar.gz -C /usr/local
vim /usr/local
export JAVA_HOME=/usr/local/jdk-21.0.6
export PATH=$PATH:$JAVA_HOME/bin

vim /usr/local/apache-tomcat-11.0.5/webapps/
ls

docs examples host-manager manager ROOT

rm -rf docs  examples  host-manager  manager  
cd ROOT
rm -rf *
vim index.jsp
tomact1 192.168.72.41

3.5启动文件

source /ect/profile

startup.sh

curl 192.168.72.41:8080

tomact 192.168.72.41

tomact2
复制相关配置文件(tomact1上进行)

scp -r /usr/local/jdk-21.0.6/ root@192.168.72.42:/usr/local
scp -r /usr/local/apache-tomcat-11.0.5/ root@192.168.72.42:/usr/local
scp -r /etc/profile root@192.168.72.42:/etx/profile

验证复制的目录

source /etc/profile
startup.sh

修改tomact主页

cd /usr/local/apache-tomcat-11.0.5/webapps/
ls

docs examples host-manager manager ROOT

rm -rf docs examples host-manager manager 
cd ROOT
rm -rf *
vim index.jsp
tomact2 192.168.72.42

启动tomact

startup.sh
curl 192.168.72.42

> tomact2 3192.168.72.42

tomact3:
复制相关配置文件(tomact1上进行)

scp -r /usr/local/jdk-21.0.6/ root@192.168.72.43:/usr/local
scp -r /usr/local/apache-tomcat-11.0.5/ root@192.168.72.43:/usr/local
scp -r /etc/profile root@192.168.72.43:/etx/profile

验证复制的目录

source /etc/profile
startup.sh

修改tomact主页

cd /usr/local/apache-tomcat-11.0.5/webapps/
ls

docs examples host-manager manager ROOT

rm -rf docs examples host-manager manager 
cd ROOT
rm -rf *
vim index.jsp
tomact3 192.168.72.43

启动tomact

startup.sh
curl 192.168.72.43

> tomact 3192.168.72.43

4.keepalived和nginx相关服务

4.1下载nginx和keepalived
mastr:

dnf install nginx -y
dnf install keepalived

4.2配置nginx

vim /etc/nginx/conf.d/master.conf
upstream tpmact1 {
	server 192.168.72.41:8080;
	server 192.168.72.42:8080;
	server 192.168.72.43:8080;
}
server{
	server_name 192.168.72.30;
	listen 80;
	access_log /var/log/nginx/master_access.log;
	error_log /var/log/nginx/master_error.log;
	location / {
			proxy_pass http://tomact1
		}
}

4.3配置keepalived

vim /etc/keepalived/keepalived.conf
global_defs {
   router_id master
}

vrrp_instance VI_1 {
    state MASTER
    interface ens160
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.72.100
    }
}
vrrp_instance VI_1 {
    state BACKUP
    interface ens160
    virtual_router_id 51
    priority 80
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.72.101
    }
}
vrrp_instance VI_1 {
    state BACKUP
    interface ens160
    virtual_router_id 51
    priority 60
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.72.102
    }
}

4.4配置nginx高可用

vim /etc/keepalived/check_nginx.sh
#!/bin/bash
counter=$(ps -C nginx --no-header | wc -l)
if [$counter -eq 0]; then
	systemctl start nginx
	if [`ps  -C --no-header | wc -l` -eq 0]; then
			systemctl stop keepalived
	fi
fi

4.5给脚本赋予执行权限

chmod +x /etc/keepalived/check_nginx.sh

4.6修改keepalived.conf文件

vim /etc/keepalived/keepalived.conf
global_defs {
   router_id master
}
vrrp_script check_nginx{
		script  "/etc/keepalived/check_nginx.sh"
		interval 2
	}
vrrp_instance VI_1 {
    state MASTER
    interface ens160
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.72.100
    }
    track check_nginx{
    	check_nginx
    }
}
vrrp_instance VI_1 {
    state BACKUP
    interface ens160
    virtual_router_id 51
    priority 80
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.72.101
    }
     track check_nginx{
    	check_nginx
    }
}
vrrp_instance VI_1 {
    state BACKUP
    interface ens160
    virtual_router_id 51
    priority 60
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.72.102
    }
     track check_nginx{
    	check_nginx
    }
}

4.7启动keepalived和nginx

systemctl start keepalived
systemctl start nginx

4.8 测试

curl192.168.72.30

> tomact1 192.168.72.41 tomact1 192.168.72.42 tomact1 192.168.72.43

backup1:
下载nginx和keepalived

dnf install nginx -y
dnf install keepalived -y

复制相关配置文件(master上进行)

scp /etc/keepalived/keepalived.conf root@192.168.72.31:/etc/keepalived/keepalived.conf/
scp /etc/keepalived/check_nginx.sh root@192.168.72.31:/etc/keepalived/

查看脚本文件

ls /etc/keepalived/check_nginx.sh

修改keepalived.conf文件

vim /etc/keepalived/keepalived.conf
global_defs {
   router_id backup
}
vrrp_script check_nginx{
		script  "/etc/keepalived/check_nginx.sh"
		interval 2
	}
vrrp_instance VI_1 {
    state BACKUP
    interface ens160
    virtual_router_id 51
    priority 60
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.72.100
    }
    track check_nginx{
    	check_nginx
    }
}
vrrp_instance VI_1 {
    state MASTER
    interface ens160
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.72.101
    }
     track check_nginx{
    	check_nginx
    }
}
vrrp_instance VI_1 {
    state BACKUP
    interface ens160
    virtual_router_id 51
    priority 80
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.72.102
    }
     track check_nginx{
    	check_nginx
    }
}

启动nginx和keepalived


```bash
systemctl start nginx
systemctl start keepalived

测试：

```bash
curl 192.168.72.31

> tomact1 192.168.72.41 tomact1 192.168.72.42 tomact1 192.168.72.43

backup2:
下载nginx和keepalived

dnf install nginx -y
dnf install keepalived -y

复制相关配置文件(master上进行)

scp /etc/keepalived/keepalived.conf root@192.168.72.32:/etc/keepalived/keepalived.conf/
scp /etc/keepalived/check_nginx.sh root@192.168.72.32:/etc/keepalived/

查看脚本文件

ls /etc/keepalived/check_nginx.sh

修改keepalived.conf文件

vim /etc/keepalived/keepalived.conf
global_defs {
   router_id backup
}
vrrp_script check_nginx{
		script  "/etc/keepalived/check_nginx.sh"
		interval 2
	}
vrrp_instance VI_1 {
    state BACKUP
    interface ens160
    virtual_router_id 51
    priority 80
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.72.100
    }
    track check_nginx{
    	check_nginx
    }
}
vrrp_instance VI_1 {
    state BACKUP
    interface ens160
    virtual_router_id 51
    priority 60
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.72.101
    }
     track check_nginx{
    	check_nginx
    }
}
vrrp_instance VI_1 {
    state MASTER
    interface ens160
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.72.102
    }
     track check_nginx{
    	check_nginx
    }
}

启动nginx和keepalived


```bash
systemctl start nginx
systemctl start keepalived


测试：

```bash
curl 192.168.72.32

> tomact1 192.168.72.41 tomact1 192.168.72.42 tomact1 192.168.72.43

5.dns相关配置:

5.1下载nginx

dnf install nginx -y

5.2配置文件

vim /etc/nginx/conf.d/dns.conf
upstream web {
		server 192.168.72.100;
		server 192.168.72.101;
		server 192.168.72.102;
	}
server {
		server_name 192.168.72.11;
		listen 80;
		access_log /var/log/ngonx/dns_access.log;
		error_log /var/log/nginx/dns_error.log;
		location / {
				proxy_pass http://web;
			}
	}

5.3 启动nginx

systemctl start nginx

5.4 测试

curl 1912.168.72.100

> tomact1 192.168.72.41 tomact1 192.168.72.42 tomact1 192.168.72.43

至此,keepalived+nginx+tomact的高可用轮询搭建完成

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【社论】上海经济开门红：不偏科、挑大梁

1.要求

2.环境准备

3.配置tomact服务

4.keepalived和nginx相关服务

5.dns相关配置:

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