阿里云IP遭受DDOS攻击 快速切换IP实践

阿里云IP遭受DDOS攻击 快速切换IP实践

#1 介绍

运行平台: 阿里云

访问链路: 域名 -> 负载均衡EIP -> 容器

• 网站无法访问，查询服务运行正常，查询公网流量异常高后断流了
• 咨询工程师是公网IP遭受DDOS攻击后触发风控安全DDOS黑洞断流
• 阿里云EIP默认提供不超过5Gbps的基础DDoS防护能力
• 创建shell脚本检查网站断流后快速切换公网IP恢复

---

#2、创建shell脚本实践

#2.1 检测域名是否可达

# 域名
domain_name="elvin.vip"
domain_sub="k8s-lb"
if ping -c 1 $domain_sub.$domain_name &> /dev/null; then
    echo "$(date +'%F %T') $domain_sub.$domain_name is online"
else
    echo "$(date +'%F %T') $domain_sub.$domain_name is not online."
fi

#2.2 查询负载均衡器的公网IP

#安装aliyun cli
wget https://aliyuncli.alicdn.com/aliyun-cli-linux-latest-amd64.tgz
tar -zxf aliyun-cli-linux-latest-amd64.tgz -C /usr/local/bin/
rm -f aliyun-cli-linux-latest-amd64.tgz

# 设置阿里云访问密钥和区域ID
export ALICLOUD_ACCESS_KEY_ID='key_id_xxx'
export ALICLOUD_ACCESS_KEY_SECRET='key_secret_xxx'
export ALICLOUD_REGION_ID='cn-shanghai'

#负载均衡实例id
LOAD_BALANCER_ID="lb-xxxxxxxx"

# 查询绑定LB的EIP
EIP_INFO=$(aliyun vpc DescribeEipAddresses --RegionId $ALICLOUD_REGION_ID | jq --arg lb_id "$LOAD_BALANCER_ID" '.EipAddresses.EipAddress[] | select(.InstanceId == $lb_id and .InstanceType == "SlbInstance")')
# 提取EIP的ID和IP地址
OLD_EIP_IP=$(echo $EIP_INFO | jq -r '.IpAddress')
OLD_EIP_ID=$(echo $EIP_INFO | jq -r '.AllocationId')

#2.3 创建新的EIP

# 创建EIP 按量付费模式 峰值带宽100M
EIP_OUTPUT=$(aliyun vpc AllocateEipAddress --RegionId $ALICLOUD_REGION_ID --InternetChargeType PayByTraffic --Bandwidth 100 --Name $domain_sub)
# 获取EIP的ID和IP地址
EIP_ID=$(echo $EIP_OUTPUT | jq -r '.AllocationId')
EIP_IP=$(echo $EIP_OUTPUT | jq -r '.EipAddress')

#2.4 负载均衡器绑定新的EIP

# 解绑现有的EIP
aliyun vpc UnassociateEipAddress --RegionId $ALICLOUD_REGION_ID --AllocationId $OLD_EIP_ID --InstanceId $LOAD_BALANCER_ID --InstanceType SlbInstance

# 绑定EIP到负载均衡器
ASSOCIATE_OUTPUT=$(aliyun vpc AssociateEipAddress --RegionId $ALICLOUD_REGION_ID --AllocationId $EIP_ID --InstanceId $LOAD_BALANCER_ID --InstanceType SlbInstance)

# 释放旧的EIP
aliyun vpc ReleaseEipAddress --AllocationId $OLD_EIP_ID

#2.5 更新域名的A记录

# 获取域名RecordId
RECORD_ID=$(aliyun alidns DescribeDomainRecords --DomainName $domain_name | jq -r --arg rr "$domain_sub" '.DomainRecords.Record[] | select(.RR == $rr) | .RecordId')

# 更新域名的A记录
aliyun alidns UpdateDomainRecord --RecordId $RECORD_ID --RR $domain_sub --Type A --Value $EIP_IP

---

#3 完整的shell实例

#!/bin/bash
# aliyun.lb.eip.update.sh
# */12 * * * *  bash /opt/aliyun.lb.eip.update.sh

# 域名和负载均衡相关信息
domain_name="elvin.vip"
domain_sub="k8s-lb"
LOAD_BALANCER_ID="lb-xxxxxxxx"

#file
[ -d /data/txt ] || mkdir -p /data/txt
ckFile=/data/txt/$domain_sub.$domain_name.ck
runLog=/data/txt/$domain_sub.$domain_name.log

#跳过一次执行
if [ -f $ckFile ]; then
    now_time=$(date +%s)
    file_time=$(stat -c %Y $ckFile)
    time_diff=$((now_time - file_time))
    # 判断是否超过10分钟
    if [ $time_diff -ge 600 ]; then
        rm -f $ckFile
        echo "$(date +'%F %T') skip run once" >>$runLog
        exit 0
    fi
fi

# 检测域名是否可达,错误时连续检查3次
for((i=1; i<4; i++));do
    if ping -c 1 $domain_sub.$domain_name &> /dev/null; then
        echo "$(date +'%F %T') $domain_sub.$domain_name is online" >>$runLog
        nk=99
        i=99
        exit 0
    else
        echo "$(date +'%F %T') $domain_sub.$domain_name is not online. Retrying..." >>$runLog
        sleep 5
    fi
done
if [ "$nk" = "99" ];then
    exit 0
else
    echo "$(date +'%F %T') Domain is not reachable after 3 attempts." >>$runLog
fi

# 设置阿里云访问密钥和区域ID
export ALICLOUD_ACCESS_KEY_ID='key_id_xxx'
export ALICLOUD_ACCESS_KEY_SECRET='key_secret_xxx'
export ALICLOUD_REGION_ID='cn-shanghai'

# 查询绑定LB的EIP
EIP_INFO=$(aliyun vpc DescribeEipAddresses --RegionId $ALICLOUD_REGION_ID | jq --arg lb_id "$LOAD_BALANCER_ID" '.EipAddresses.EipAddress[] | select(.InstanceId == $lb_id and .InstanceType == "SlbInstance")')
# 提取EIP的ID和IP地址
OLD_EIP_IP=$(echo $EIP_INFO | jq -r '.IpAddress')
OLD_EIP_ID=$(echo $EIP_INFO | jq -r '.AllocationId')
# 验证结果
if [ -z "$OLD_EIP_IP" ]; then
    echo "$(date +'%F %T') Failed to find OLD_EIP_IP" >>$runLog
    exit 1
fi
echo "$(date +'%F %T') Old EIP: $OLD_EIP_IP" >>$runLog

# 创建EIP 按量付费模式 峰值带宽100M
EIP_OUTPUT=$(aliyun vpc AllocateEipAddress --RegionId $ALICLOUD_REGION_ID --InternetChargeType PayByTraffic --Bandwidth 100 --Name $domain_sub)
# 获取EIP的ID和IP地址
EIP_ID=$(echo $EIP_OUTPUT | jq -r '.AllocationId')
EIP_IP=$(echo $EIP_OUTPUT | jq -r '.EipAddress')
# 验证EIP创建
if [ -z "$EIP_ID" ] || [ -z "$EIP_IP" ]; then
    echo "$(date +'%F %T') Test Failed: Failed to create EIP." >>$runLog
    echo "eip_create: $EIP_OUTPUT" >>$runLog
    exit 1
fi
echo "$(date +'%F %T') New EIP: $EIP_IP" >>$runLog

# 解绑现有的EIP
echo "$(date +'%F %T') Remove LB-EIP" >>$runLog >>$runLog
aliyun vpc UnassociateEipAddress --RegionId $ALICLOUD_REGION_ID --AllocationId $OLD_EIP_ID --InstanceId $LOAD_BALANCER_ID --InstanceType SlbInstance >>$runLog

sleep 2
# 绑定EIP到负载均衡器
ASSOCIATE_OUTPUT=$(aliyun vpc AssociateEipAddress --RegionId $ALICLOUD_REGION_ID --AllocationId $EIP_ID --InstanceId $LOAD_BALANCER_ID --InstanceType SlbInstance)
# 验证绑定
if [ $? -ne 0 ]; then
    echo "$(date +'%F %T') EIP add to LB Failed." >>$runLog
    echo "eip_update: $ASSOCIATE_OUTPUT" >>$runLog
    exit 1
else
    # echo "EIP add to LB successfully."
    echo "$(date +'%F %T') eip_update: $ASSOCIATE_OUTPUT" >>$runLog
fi

sleep 2
# 释放旧的EIP
echo "$(date +'%F %T') Release old EIP $OLD_EIP_ID" >>$runLog
aliyun vpc ReleaseEipAddress --AllocationId $OLD_EIP_ID  >>$runLog

# 获取域名RecordId
RECORD_ID=$(aliyun alidns DescribeDomainRecords --DomainName $domain_name | jq -r --arg rr "$domain_sub" '.DomainRecords.Record[] | select(.RR == $rr) | .RecordId')

# 更新域名的A记录
echo "$(date +'%F %T') Update IP: $domain_sub.$domain_name  $EIP_IP" >>$runLog
aliyun alidns UpdateDomainRecord --RecordId $RECORD_ID --RR $domain_sub --Type A --Value $EIP_IP >>$runLog

#notie msg
#dingtalk
export ddtxt="notice from ip-update \n$domain_sub.$domain_name \n$EIP_IP"
export ddtoken="10b70b4fcb8a5ddad86b7a4396183639a6a99c2660xxxxxx"
curl -ks -m 5 http://files.elvin.vip/shell/ddmsg.url.txt.sh |bash
#lark
export txtmsg="notice from ip-update \n$domain_sub.$domain_name \n$EIP_IP"
export larktoken="f6bfc69d-2617-46d7-a42b-123xxxxxx"
curl -ks -m 5 http://files.elvin.vip/shell/lkmsg.txt.sh |bash

# 记录完成时间
date +"%F %T" >$ckFile
exit 0

source: https://gitee.com/alivv/elvin-demo/blob/master/shell/aliyun.lb.eip.update.sh