2.1 主机规划

主机	系统	软件	IP
client	redhat9.7	无	192.168.72.115/24
lvs-master	redhat9.7	ipvsadm keepalived	VIP：192.168.72.100/32 DIP：192.168.72.116/24
lvs-backup	redhat9.7	ipvsadm keepalived	VIP：192.168.72.100/32 DIP：192.168.72.117/24
rs1	redhat9.7	nginx, nfs-utils	192.168.72.118/24
rs2	redhat9.7	nginx, nfs-utils	192.168.72.119/24
nfs	redhat9.7	nfs-utils	192.168.72.120/24

使用脚本修改ip+主机名

#!/bin/bash

useage: sudo ./init_sys.sh <hostname> <ip_address> [gateway] [dns]

RED='\033[0;31m'

GREEN='\033[0;32m'

YELLOW='\033[1;33m'

NC='\033[0m'

log_info() {

echo -e " ${GREEN}\[INFO\]$ {NC} $1"

}

log_warn() {

echo -e " ${YELLOW}\[WARN\]$ {NC} $1"

}

log_error() {

echo -e " ${RED}\[ERROR\]$ {NC} $1"

}

check_root() {

if [[ $EUID -ne 0 ]]; then

log_error "此脚本必须以root权限运行"

exit 1

fi

}

usage() {

echo "用法: $0 <hostname> <ip_address> [gateway] [dns_servers]"

echo ""

echo "参数说明:"

echo " hostname 要设置的主机名"

echo " ip_address 要设置的静态IP地址 (如: 192.168.72.100)"

echo " gateway 网关地址 (如: 192.168.72.2)"

echo " dns_servers DNS服务器，逗号分隔 (可选，默认: 8.8.8.8,223.5.5.5)"

echo ""

echo "示例:"

echo " $0 myserver 192.168.72.100 192.168.72.2 8.8.8.8,223.5.5.5"

echo " $0 webserver 10.0.0.50"

exit 1

}

get_interface() {

尝试获取第一个活动的非环回接口

local interface= $(ip route \| grep default \| head -1 \| awk '{print$ 5}' 2>/dev/null)

if [[ -z "$interface" ]]; then

如果没有默认路由，获取第一个非环回接口

interface= $(ip link show \| grep -v lo \| grep 'state UP' \| head -1 \| awk -F': ' '{print$ 2}')

fi

if [[ -z "$interface" ]]; then

log_error "无法自动检测网络接口"

read -p "请输入网络接口名称 (如: eth0, ens160): " interface

fi

echo "$interface"

}

set_hostname() {

local hostname=$1

log_info "正在设置主机名为: $hostname"

/usr/bin/hostnamectl set-hostname $hostname

log_info "主机名设置完成"

}

set_static_ip() {

local interface=$(get_interface)

local ip=$1

local gateway=${2:-"192.168.72.2"}

local dns=${3:-"223.5.5.5,8.8.8.8"}

log_info "正在为接口 $interface 配置静态IP:$ ip"

nmcli c modify $interface ipv4.method manual ipv4.addresses$ ip/24 ipv4.gateway $gateway ipv4.dns$ dns connection.autoconnect yes

nmcli c up $interface

}

main() {

if [[ $# -lt 2 ]]; then

usage

fi

check_root

set_hostname "$1"

set_static_ip " $2" "$ 3" "$4"

}

main "$@"

执行以下命令关闭防火墙，selinux

2.3 搭建NFS

1、安装nfs-utils工具

2、创建共享目录和文件

3、给共享目录设置权限

4、配置nfs

5、配置生效

6、启动服务

7、验证配置

2.4 搭建web1

1、安装nginx和nfs-utils

2、挂载目录

3、启动nginx

4、运行测试

5、配置VIP

2.4 搭建web2

1、安装nginx和nfs-utils

2、挂载目录

3、启动nginx

4、运行测试

5、配置vip

2.5 搭建lvs-master

1、安装ipvsadm和keepaived

2、创建lvs的配置文件

3、启动lvs

4、配置keepalived

复制代码

[root@lvs-master ~]# cp /etc/keepalived/keepalived.conf{,.bak}
[root@lvs-master ~]# vim /etc/keepalived/keepalived.conf

文件的内容如下：

复制代码

global_defs {
   router_id LVS_master
}

vrrp_script chk_nginx {
   script "/etc/keepalived/check_nginx.sh"
   interval 2
   fall 3
   rise 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 {
        192.168.184.100
    }
    #track_script {
    #    chk_nginx
    #}
}

virtual_server 192.168.184.100 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    protocol TCP

    real_server 192.168.184.118 80 {
        weight 1
        TCP_CHECK {
            connect_port 80
            connect_timeout 3
            retry 3
            delay_before_retry 3
        }
    }

    real_server 192.168.184.119 80 {
        weight 1
        TCP_CHECK {
            connect_port 80
            connect_timeout 3
            retry 3
            delay_before_retry 3
        }
    }
}

5、编写检查脚本

复制代码

[root@lvs-master ~]# vim /etc/keepalived/check_nginx.sh

脚本内容如下：

复制代码

#!/bin/bash

count=`ps -C nginx --no-header | wc -l`
if [ $count -eq 0 ]; then
    /usr/bin/systemctl start nginx
    sleep 1
    if [ `ps -C nginx --no-header | wc -l` -eq 0 ]; then
        /usr/bin/systemctl stop keepalived
    fi
fi

然后给这个脚本可执行权限

6、查看LVS规则

7、启动keepalived

systemctl start keepalived.service

8、查看VIP

2.6 搭建lvs-backup

1、安装ipvsadm和keepalived

2、创建lvs配置文件

3、启动lvs

4、配置keepalived

1. 从lvs-master服务器上复制配置文件

global_defs {

router_id LVS_backup

}

vrrp_script chk_nginx {

script "/etc/keepalived/check_nginx.sh"

interval 2

timeout 2

weight -20

fall 3

rise 2

}

vrrp_instance VI_1 {

state BACKUP

interface ens160

virtual_router_id 51

priority 90

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.184.100

}

#track_script {

chk_nginx

#}

}

virtual_server 192.168.184.100 80 {

delay_loop 6

lb_algo rr

lb_kind DR

protocol TCP

real_server 192.168.184.118 80 {

weight 1

TCP_CHECK {

connect_port 80

connect_timeout 3

retry 3

delay_before_retry 3

}

}