快速搭建keepalived（DR）+lvs脚本

Posted 2020-11-19

#!/bin/bash
#write:blacksnow
echo "Welcome use keepalived+LVS(DR) script！！"
read -p "Keepalived_master_地址:           " KL_master
read -p "Keepalived_backup地址:            " KL_backup
read -p "报警邮件名(eg:[email protected]):    " EM_to
read -p "邮件的发送名(eg:[email protected]): " EM_from
read -p "监测网络的接口(eg:eth0):          " interface
read -p "虚拟VIP地址:                      " vir_VIP
read -p "虚拟访问端口(default 80):         " port
port=${port:-80}

read -p "负载调度算法(rr/wrr):             " lb_algo
#read -p "负载均衡的机制(NAT/TUN/DR):       " lb_kind
lb_kind=‘DR‘
read -p "后端web-1地址:                    " real1_IP
read -p "后端web-2地址:                    " real2_IP

NULL="/dev/null"
real1_weight=1
real2_weight=1

####################################################
#调度器Keepalived+lvs（DR）
####################################################
#
#ssh ${KL_master}  yum -y install keepalived ipvsadm >${NULL}
#ssh ${KL_backup}  yum -y install keepalived ipvsadm >${NULL}
#
####################################################
#Keepalived+lvs（DR）MASTER配置
####################################################

cat <<EOE | ssh ${KL_master} "cat -> /etc/keepalived/keepalived.conf"
! Configuration File for keepalived

global_defs {
   notification_email {
     ${EM_to}
   }
   notification_email_from ${EM_from}
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
   vrrp_skip_check_adv_addr
   #vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

vrrp_instance VI_1 {
    state MASTER
    interface ${interface}
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        ${vir_VIP}
    }
}

virtual_server ${vir_VIP} ${port} {
    delay_loop 6
    lb_algo ${lb_algo}
    lb_kind ${lb_kind}
    persistence_timeout 50
    protocol TCP

    real_server ${real1_IP} ${port} {
        weight ${real1_weight}
           TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
    real_server ${real2_IP} ${port} {
        weight ${real2_weight}
           TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}
EOE
####################################################
#Keepalived+lvs（DR）BACKUP配置
####################################################

cat <<EOE | ssh ${KL_backup} "cat -> /etc/keepalived/keepalived.conf"
! Configuration File for keepalived

global_defs {
   notification_email {
     ${EM_to}
   }
   notification_email_from ${EM_from}
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
   vrrp_skip_check_adv_addr
   #vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

vrrp_instance VI_1 {
    state MASTER
    interface ${interface}
    virtual_router_id 51
    priority 50
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        ${vir_VIP}
    }
}

virtual_server ${vir_VIP} ${port} {
    delay_loop 6
    lb_algo ${lb_algo}
    lb_kind ${lb_kind}
    persistence_timeout 50
    protocol TCP

    real_server ${real1_IP} ${port} {
        weight ${real1_weight}
           TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
    real_server ${real2_IP} ${port} {
        weight ${real2_weight}
           TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}
EOE
####################################################
#Realserver 修改ARP内核参数和绑定VIP地址
####################################################
for IP in ${real1_IP} ${real2_IP}
do
cat <<EOE |ssh ${IP}  "cat - > /etc/sysconfig/network-scripts/ifcfg-lo:0"
DEVICE=lo:0
IPADDR=${vir_VIP}
NETMASK=255.255.255.255
NETWORK=${vir_VIP}
BROADCAST=${vir_VIP}
ONBOOT=yes
NAME=lo:0
EOE
ssh ${IP} ifup lo:0

cat <<EOE |ssh ${IP}  "cat - > /etc/sysctl.conf"
net.ipv4.conf.all.arp_ignore = 1 
net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
net.ipv4.conf.lo.arp_announce = 2
EOE
ssh ${IP} sysctl  -p  > ${NULL}
done

####################################################
#开启keepalived
####################################################
ssh ${KL_master}  "systemctl restart keepalived"
ssh ${KL_master}  "systemctl enable keepalived"
ssh ${KL_backup}  "systemctl restart keepalived"
ssh ${KL_backup}  "systemctl enable keepalived"

echo -e "33[36mSuccessful configure！！33[0m"