Cloudflare 系统负载超过一定的值时 自动切换5秒盾脚本

首先到官网下载脚本或者本站下载：

1. wget https://www.7198.net/Shell/cloudflare-block.sh && chmod +x cloudflare-block.sh

cloudflare-block.sh 脚本：

1. #!/bin/bash
4. # $1 = 1min, $2 = 5min, $3 = 15min
5. loadavg=$(awk ‘{printf “%f”, $1}’ < /proc/loadavg)
8. # load is 10, you can modify this if you want load more than 10
9. maxload=10
12. # Configuration API Cloudflare
13. # Your Global API Key (https://dash.cloudflare.com/profile)
14. api_key=
15. # Email of your Cloudflare account
16. email=
17. # Zone ID (https://dash.cloudflare.com/_zone-id_/domain.com)
18. zone_id=
19. # Default security level when there is no attack, see in readme
20. default_security_level=high
21. # Whether to write debug messages to the debug.log file under script dir
22. debug=0
25. basedir=$(dirname “$0”)
27. attacked_file=$basedir/attacked
29. [ “$debug” -eq 1 ] && exec > “${logfile:-$basedir/debug.log}”
32. # You can put aforementioned config values either in-place
33. # or in the file named ‘config’ in the script’s directory.
34. config_file=$basedir/config
35. [ -e “$config_file” ] && source “$config_file”
38. api_set_mode() {
39. local mode
40. mode=$1
41. curl -s -X PATCH “https://api.cloudflare.com/client/v4/zones/$zone_id/settings/security_level”
42. -H “X-Auth-Email: $email”
43. -H “X-Auth-Key: $api_key”
44. -H “Content-Type: application/json”
45. –data “{“value”:”$mode”}”
46. || echo “Error: failed to set security level to $mode”
47. }
50. # create file “attacked” if doesn’t exist
51. if [ ! -e “$attacked_file” ]; then
52. echo 0 > “$attacked_file”
53. fi
56. was_under_attack=$(cat “$attacked_file”)
57. under_attack=$(echo “$loadavg > $maxload” | bc)
59. if [[ “$1” != [01] ]]; then
60. echo “Incorrect usage! Please pass either 0 or 1 as an argument”
61. exit 1
62. fi
64. if [ $debug -eq 1 ]; then
65. echo “Mode: $1; was under attack: $was_under_attack; now under attack: $under_attack”
66. echo “Load average: $loadavg”
67. fi
69. if [ “$1” -eq 0 ] && [ “$was_under_attack” -eq 0 ] && [ “$under_attack” -eq 1 ]; then
70. # attack just started and we want to enable under-attack mode
72. # Activate protection
73. [ “$debug” -eq 1 ] && echo “Activating under-attack mode!”
74. echo 1 > “$attacked_file”
75. api_set_mode under_attack
77. elif [ “$1” -eq 1 ] && [ “$was_under_attack” -eq 1 ] && [ “$under_attack” -eq 0 ]; then
78. # attack just finished (and up to 20 minutes passed since)
79. # and we want to disable under-attack mode
81. # Disable Protection
82. [ “$debug” -eq 1 ] && echo “Leaving under-attack mode!”
83. echo 0 > “$attacked_file”
84. api_set_mode “$default_security_level”
86. fi
88. exit 0

修改 cloudflare-block.sh 配置：

1. ＃您的 cloudflare API 密钥（https://dash.cloudflare.com/profile）
2. API_KEY=
3. ＃您的 Cloudflare 帐户的电子邮件
4. email=
5. ＃Zone ID（https://dash.cloudflare.com/_zone-id_/domain.com）
6. zone_id=
7. ＃没有攻击时的默认安全级别，请参阅 Cloudflare 帮助文件
8. default_security_level=high
9. ＃是否将调试消息写入脚本目录下的 debug.log 文件
10. debug=0

脚本默认的是检测系统负载为 10，启动” I’m Under Attack! “模式，可以根据需要来调整，一般可以简单的设置为你的核心数*1.2 比如你 CPU 是双核的,可以设置为 2.4

1. maxload= 7

设置定时任务，如果未启用保护，每 1 分钟检查一次，负载高于 7 开启 5 秒盾。如果启用保护，则每 20 分钟检查一次，负载降为 7 以下时取消 5 秒盾：

1. */1 * * * * /root/cloudflare-block.sh 0
2. */20 * * * * /root/cloudflare-block.sh 1

Cloudflare 是一个非常好用的防御 DDos 和 CC 攻击的工具，免费版本的 Cloudflare 结合 API 可以实现更加灵活的功能，对于普通的防御足够自己使用了。

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