自动化脚本

编写综合性功能脚本一键部署基于【LVS】【Nginx】【Keepalived】的刚可用集群脚本，该脚本要求可以针对管理员需求选择使用那一个负载均衡器（反向代理服务）一键部署高可用集群架构（后端真实服务器建议选用nginx）。书写脚本时，注意加入yum源、以及对于那个服务的可用性判断。
以下仅供参考

#!/bin/bash
#【一级菜单】
main_menu(){
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"
echo -e -n "\e[40;37m \t\t \e[0m" ; echo -e -n "\e[47;34m ***  keepalived 自 动 化 脚 本 主 菜 单  ***\e[0m" ; echo -e "\e[40;37m \t\t \e[0m"
echo -e "\e[40;37m \t\t\t【1】- nginx的安装配置\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t【2】- keepalived的安装配置\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t【3】- lvs的安装配置\t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t【4】- 安装检测脚本 \t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t【5】- 退  出 \t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"

}

#【二级菜单】

menu_1(){
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"
echo -e -n "\e[40;37m \t\t \e[0m" ; echo -e -n "\e[47;34m ***   nginx的安装配置  ***\e[0m" ; echo -e "\e[40;37m \t\t \e[0m"
echo -e "\e[40;37m \t\t\t【1】- 反向代理服务器端\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t【2】- 真实服务器端\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t【3】- 返回主菜单\t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"

}



menu_2(){
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"
echo -e -n "\e[40;37m \t\t \e[0m" ; echo -e -n "\e[47;34m ***  keepalived 的安装配置  ***\e[0m" ; echo -e "\e[40;37m \t\t \e[0m"
echo -e "\e[40;37m \t\t\t【1】- master端\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t【2】- slave端\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t【3】- 返回主菜单\t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"

}

menu_3(){
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"
echo -e -n "\e[40;37m \t\t \e[0m" ; echo -e -n "\e[47;34m ***  lvs的安装配置  ***\e[0m" ; echo -e "\e[40;37m \t\t \e[0m"
echo -e "\e[40;37m \t\t\t【1】- DR模式\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t【2】- NAT模式\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t【3】- 返回主菜单\t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"

}


#【三级菜单】

menu_3_1(){
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"
echo -e -n "\e[40;37m \t\t \e[0m" ; echo -e -n "\e[47;34m ***   lvs_dr的安装配置  ***\e[0m" ; echo -e "\e[40;37m \t\t \e[0m"
echo -e "\e[40;37m \t\t\t【1】- lvs_dr_master安装配置\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t【2】- lvs_dr_slave安装配置\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t【3】- lvs_dr_rs安装配置\t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t【4】- 返回主菜单\t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"

}

menu_3_2(){
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"
echo -e -n "\e[40;37m \t\t \e[0m" ; echo -e -n "\e[47;34m ***   lvs_nat的安装配置  ***\e[0m" ; echo -e "\e[40;37m \t\t \e[0m"
echo -e "\e[40;37m \t\t\t【1】- lvs_nat_master安装配置\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t【2】- lvs_nat_slave安装配置\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t【3】- lvs_nat_rs安装配置\t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t【4】- 返回主菜单\t\t\t\t \e[0m"
echo -e "\e[40;37m \t\t\t\t\t\t\t\t\t \e[0m"

}


#【函数：安装配置keepalived主节点】
install_ka_master(){
	setenforce 0
	systemctl stop firewalld
	read -p "请输入你要设置的VIP：" a
	yum -y install keepalived
	mv /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak
        cat > /etc/keepalived/keepalived.conf  <<EOF
! Configuration File for keepalived

global_defs {
   router_id directory1
}

vrrp_script check_nginx {
   script "/etc/keepalived/check_nginx_status.sh"
   interval 5
}

vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 80
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        $a/24
    }
    track_script {
        check_nginx
    }
}		
EOF
	systemctl start keepalived
	systemctl enable keepalived
}

#【函数：安装配置keepalived从节点】
install_ka_slave(){
	setenforce 0
	systemctl stop firewalld
	read -p "请输入你要设置的VIP：" a
        yum -y install keepalived
        mv /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak
	         cat > /etc/keepalived/keepalived.conf  <<EOF
! Configuration File for keepalived

global_defs {
   router_id directory2
}

vrrp_instance VI_1 {
    state BACKUP    #设置为backup
    interface ens33
    nopreempt        #设置到back上面，不抢占资源(VIP)
    virtual_router_id 80
    priority 50   #辅助改为50
    advert_int 1	#检测间隔1s
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        $a/24
    }
}
EOF
        systemctl start keepalived
        systemctl enable keepalived
}


#【函数：加入检测脚本服务】
check_ka(){
	 cat > /etc/keepalived/check_nginx_status.sh  <<'EOF'
	#!/bin/bash					        
	/usr/bin/curl -I http://localhost &>/dev/null
	if [ $? -ne 0 ];then						    
	#	/etc/init.d/keepalived stop
	systemctl stop keepalived
	fi
EOF
	chmod 777 /etc/keepalived/check_nginx_status.sh
	systemctl restart keepalived nginx			
}

#【函数：安装和配置nginx_proxy】
install_nginx_proxy(){
	setenforce 0
	systemctl stop firewalld
	cat > /etc/yum.repos.d/nginx.repo  <<'EOF'
[nginx-stable]
name=nginx stable repo
baseurl=http://nginx.org/packages/centos/$releasever/$basearch/
gpgcheck=0
enabled=1
EOF
	yum -y install nginx
	read -p "请输入你的server1的IP："  b
	read -p "请输入你的server2的IP："  c
	mv /etc/nginx/conf.d/default.conf /etc/nginx/conf.d/default.conf.bak
	cat > /etc/nginx/conf.d/default.conf  <<EOF
	upstream index {
        server $b:80 weight=1 max_fails=2 fail_timeout=2;
        server $c:80 weight=2 max_fails=2 fail_timeout=2;
	}
EOF
	cat >> /etc/nginx/conf.d/default.conf  <<'EOF'       
	server {
        listen 80;
        server_name     localhost;
        access_log  /var/log/nginx/host.access.log  main;
        

        location / {
         proxy_pass http://index;
         proxy_redirect default;
         proxy_set_header Host $http_host;
         proxy_set_header X-Real-IP $remote_addr;
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }

}
EOF
	systemctl restart nginx
}

#【函数：安装和配置nginx_server】
install_nginx_server(){
	setenforce 0
	systemctl stop firewalld
	cat > /etc/yum.repos.d/nginx.repo  <<'EOF'
[nginx-stable]
name=nginx stable repo
baseurl=http://nginx.org/packages/centos/$releasever/$basearch/
gpgcheck=0
enabled=1
EOF
	yum -y install nginx
	systemctl restart nginx
}


#【函数：LVS_Director + KeepAlived master】
install_lvs_dr_master(){
	setenforce 0
	systemctl stop firewalld
	read -p "请输入你要设置的VIP：" d
	read -p "请输入你的server1的IP：" e
	read -p "请输入你的server2的IP：" f
	yum -y install ipvsadm keepalived
	mv /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak
        cat > /etc/keepalived/keepalived.conf  <<EOF
! Configuration File for keepalived

global_defs {
   router_id lvs-keepalived-master    #辅助改为lvs-backup
}

vrrp_instance VI_1 {
    state MASTER
    interface ens33                #VIP绑定接口
    virtual_router_id 80         #VRID 同一组集群，主备一致          
    priority 100            #本节点优先级，辅助改为50
    advert_int 1            #检查间隔，默认为1s
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        $d/24
    }
}

virtual_server $d 80 {    #LVS配置
	delay_loop 3  #启动3个进程
	lb_algo rr     #LVS调度算法
	lb_kind DR     #LVS集群模式（路由模式）
	nat_mask 255.255.255.0
	protocol TCP      #健康检查使用的协议
	real_server $e 80 {
		weight 1
		inhibit_on_failure   #当该节点失败时，把权重设置为0，而不是从IPVS中删除
		TCP_CHECK {          #健康检查
			connect_port 80   #检查的端口
			connect_timeout 3  #连接超时的时间
			}
		}
	real_server $f 80 {
		weight 1
		inhibit_on_failure
		TCP_CHECK {
			connect_timeout 3
			connect_port 80
			}
		}
}
EOF
	systemctl start keepalived
	systemctl enable keepalived


}


#【函数：LVS_Director + KeepAlived slave】
install_lvs_dr_slave(){
	setenforce 0
	systemctl stop firewalld
	read -p "请输入你要设置的VIP：" g
	read -p "请输入你的server1的IP：" h
	read -p "请输入你的server2的IP：" i
	yum -y install ipvsadm keepalived
	mv /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak
        cat > /etc/keepalived/keepalived.conf  <<EOF
! Configuration File for keepalived

global_defs {
   router_id lvs-keepalived-slave
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    nopreempt                    #不抢占资源
    virtual_router_id 80
    priority 50
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        $g/24
    }
}
virtual_server $g 80 {
	delay_loop 3
	lb_algo rr
	lb_kind DR
	nat_mask 255.255.255.0
	protocol TCP
	real_server $h 80 {
		weight 1
		inhibit_on_failure
		TCP_CHECK {
			connect_port 80
			connect_timeout 3
			}
		}
	real_server $i 80 {
		weight 1
		inhibit_on_failure
		TCP_CHECK {
			connect_timeout 3
			connect_port 80
			}
		}
}
EOF
	systemctl start keepalived
	systemctl enable keepalived

}


#【函数：LVS_Director + KeepAlived rs】
install_lvs_dr_rs(){
	setenforce 0
	systemctl stop firewalld
	read -p "请输入你的proxy的VIP：" j
	yum -y install nginx
	ip addr add dev lo $j/32
	echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore #忽略arp广播
	echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce #匹配精确ip地址回包
	systemctl restart nginx
}


#【函数：LVS_NAT + Keepalived master】
install_lvs_nat_master(){
	setenforce 0
	systemctl stop firewalld
	read -p "请输入你要设置的外网VIP：" j
	read -p "请输入你的server1的IP：" k
	read -p "请输入你的server2的IP：" l
	read -p "请输入你要设置的内网VIP：" m
	yum -y install ipvsadm keepalived
	mv /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak
        cat > /etc/keepalived/keepalived.conf  <<EOF
! Configuration File for keepalived
global_defs {
    router_id lvs-keepalived-master
}

vrrp_instance VI_1 {
    state MASTER
    interface ens37		#桥接网卡名称
    virtual_router_id 80
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
      $j/24		#注意自己的网段
    }
}

virtual_server $j 80 {
    delay_loop 3
    lb_algo rr
    lb_kind NAT
    nat_mask 255.255.255.0
    protocol TCP
real_server $k 80 {
    weight 1
    inhibit_on_failure
    TCP_CHECK {
        connect_port 80
        connect_timeout 3
    }
}
real_server $l 80 {
    weight 1
    inhibit_on_failure
    TCP_CHECK {
    connect_timeout 3
    connect_port 80
    }
    }
}
vrrp_instance VI_2 {
    state MASTER
    interface ens33		#NAT模式网卡名称
    virtual_router_id 100
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 2222
        }
    virtual_ipaddress {
        $m/24
    }
}
EOF
        cat >> /etc/sysctl.conf  <<EOF
net.ipv4.ip_forward = 1
EOF
	sysctl -p
	systemctl start keepalived
	systemctl enable keepalived


}


#【函数：LVS_NAT + Keepalived slave】
install_lvs_nat_slave(){
	setenforce 0
	systemctl stop firewalld
	read -p "请输入你要设置的外网VIP：" j
	read -p "请输入你的server1的IP：" k
	read -p "请输入你的server2的IP：" l
	read -p "请输入你要设置的内网VIP：" m
	yum -y install ipvsadm keepalived
	mv /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak
        cat > /etc/keepalived/keepalived.conf  <<EOF
! Configuration File for keepalived
global_defs {
    router_id lvs-keepalived-slave
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens37
    nopreempt
    virtual_router_id 80
    priority 50
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
      $j/24
    }
}

virtual_server $j 80 {
    delay_loop 3
    lb_algo rr
    lb_kind NAT
    nat_mask 255.255.255.0
    protocol TCP
real_server $k 80 {
    weight 1
    inhibit_on_failure
    TCP_CHECK {
        connect_port 80
        connect_timeout 3
    }
}
real_server $l 80 {
    weight 1
    inhibit_on_failure
    TCP_CHECK {
    connect_timeout 3
    connect_port 80
    }
    }
}
vrrp_instance VI_2 {
    state BACKUP
    interface ens33
    nopreempt
    virtual_router_id 100
    priority 50
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 2222
        }
    virtual_ipaddress {
        $m/24
    }
}
EOF
        cat >> /etc/sysctl.conf  <<EOF
net.ipv4.ip_forward = 1
EOF
	sysctl -p
	systemctl start keepalived
	systemctl enable keepalived

}


#【函数：_LVS_NAT + Keepalived rs】
install_lvs_nat_rs(){
	setenforce 0
	systemctl stop firewalld
	read -p "请输入proxy内网VIP：" j
	yum -y install nginx net-tools
	route add default gw $j  dev ens33
	systemctl restart nginx
}







############################【开始】################################
while :
do
       main_menu 
        read -p "请输入你的选择：【 1 / 2 / 3 / 4 / 5】 " num
        clear

	if [ $num -eq 1 ]
	then
	
		while :
		do
			echo -e "\e[45;37m \t\t\t【 下 方 是 二 级 菜 单 】\t\t\t \e[0m"
			menu_1
			read -p "请输入你的选择：【 1 / 2 / 3 】 " num_1
			clear
			case $num_1 in
			1)
				install_nginx_proxy
			;;
			2)
				install_nginx_server
			;;
			3)
				clear
				break
			;;
			*)
				clear
				echo -e "\e[41;34m \t\t请按照提示输入正确的选项：【 例 如 数 字：1 】\t\t \e[0m"
			;;
			esac
	
		done


	elif [ $num -eq 2 ]
	then
	
		while :
		do
			echo -e "\e[45;37m \t\t\t【 下 方 是 二 级 菜 单 】\t\t\t \e[0m"
			menu_2
			read -p "请输入你的选择：【 1 / 2 / 3 】 " num_2
			clear
			case $num_2 in
			1)
				install_ka_master
			;;
			2)
				install_ka_slave
			;;
			3)
				clear
				break
			;;
			*)
				clear
				echo -e "\e[41;34m \t\t请按照提示输入正确的选项：【 例 如 数 字：1 】\t\t \e[0m"
			;;
			esac
	
		done


	elif [ $num -eq 3 ]
	then
	
		while :
		do
			echo -e "\e[45;37m \t\t\t【 下 方 是 二 级 菜 单 】\t\t\t \e[0m"
			menu_3
			read -p "请输入你的选择：【 1 / 2 / 3 】 " num_3
			clear
			if [ $num_3 -eq 1 ]
			then
	
				while :
				do
					echo -e "\e[45;37m \t\t\t【 下 方 是 三 级 菜 单 】\t\t\t \e[0m"
					menu_3_1
					read -p "请输入你的选择：【 1 / 2 / 3 / 4 】 " num_31
					clear
					case $num_31 in
					1)
						install_lvs_dr_master
					;;
					2)
						install_lvs_dr_slave
					;;
					3)
						install_lvs_dr_rs
					;;
					4)
						clear
						break
					;;
					*)
						clear
						echo -e "\e[41;34m \t\t请按照提示输入正确的选项：【 例 如 数 字：1 】\t\t \e[0m"
					;;
					esac
	
				done
			elif [ $num_3 -eq 2 ]
			then
	
				while :
				do
					echo -e "\e[45;37m \t\t\t【 下 方 是 三 级 菜 单 】\t\t\t \e[0m"
					menu_3_2
					read -p "请输入你的选择：【 1 / 2 / 3 / 4 】 " num_32
					clear
					case $num_32 in
					1)
						install_lvs_nat_master
					;;
					2)
						install_lvs_nat_slave
					;;
					3)
						install_lvs_nat_rs
					;;
					4)
						clear
						break
					;;
					*)
						clear
						echo -e "\e[41;34m \t\t请按照提示输入正确的选项：【 例 如 数 字：1 】\t\t \e[0m"
					;;
					esac
	
				done
			elif [ $num_3 -eq 3 ]
			then
				clear
				break
			else 
				clear 
				echo -e "\e[41;34m \t\t请按照提示输入正确的选项：【 例 如 数 字：1 】\t\t \e[0m"
			fi	
			
		done


	elif [ $num -eq 4 ]
	then
			check_ka
	
	elif [ $num -eq 5 ]
	then
		exit 0
	else 
		clear 
		echo -e "\e[41;34m \t\t请按照提示输入正确的选项：【 例 如 数 字：1 】\t\t \e[0m"
		
	fi

done

​