\u9ad8\u7d1aDDoS\u9632\u8b77\u7b56\u7565<\/strong><\/h2>\n

\u73fe\u4ee3DDoS\u9632\u8b77\u9700\u8981\u591a\u5c64\u6b21\u65b9\u6cd5\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528iptables\u898f\u5247\u4f86\u7de9\u89e3\u57fa\u672cDDoS\u653b\u64ca\u7684\u793a\u4f8b\uff1a<\/p>\n

\r\n# Drop ICMP echo-request messages sent to broadcast address\r\niptables -A INPUT -p icmp -m icmp --icmp-type address-mask-request -j DROP\r\niptables -A INPUT -p icmp -m icmp --icmp-type timestamp-request -j DROP\r\n\r\n# Limit RST packets\r\niptables -A INPUT -p tcp --tcp-flags RST RST -m limit --limit 2\/s --limit-burst 2 -j ACCEPT\r\niptables -A INPUT -p tcp --tcp-flags RST RST -j DROP\r\n\r\n# Limit new TCP connections per second per source IP\r\niptables -A INPUT -p tcp -m state --state NEW -m limit --limit 20\/s --limit-burst 20 -j ACCEPT\r\n<\/code><\/pre>\n
\u9019\u4e9b\u898f\u5247\u69cb\u6210\u4e86\u5168\u9762\u4fdd\u8b77\u7b56\u7565\u7684\u4e00\u90e8\u5206\uff0c\u5305\u62ec\uff1a<\/p>\n
\n
\u61c9\u7528\u7a0b\u5f0f\u7d1a\u5225\u7684\u901f\u7387\u9650\u5236<\/li>\n
TCP SYN cookies\u555f\u52d5<\/li>\n
\u983b\u5bec\u76e3\u63a7\u548c\u9650\u5236<\/li>\n
\u5728\u9069\u7528\u60c5\u6cc1\u4e0b\u9032\u884c\u5730\u7406IP\u904e\u6ffe<\/li>\n<\/ul>\n
\u8ca0\u8f09\u5e73\u8861\u914d\u7f6e<\/strong><\/h2>\n
\u5be6\u65bd\u8ca0\u8f09\u5e73\u8861\u4e0d\u50c5\u53ef\u4ee5\u5206\u914d\u6d41\u91cf\uff0c\u9084\u53ef\u4ee5\u589e\u52a0\u984d\u5916\u7684IP\u4fdd\u8b77\u5c64\u3002\u4ee5\u4e0b\u662fNginx\u8ca0\u8f09\u5e73\u8861\u5668\u914d\u7f6e\u793a\u4f8b\uff1a<\/p>\n
\r\n# \/etc\/nginx\/nginx.conf\r\nhttp {\r\n    upstream backend_servers {\r\n        least_conn;  # Use least connections algorithm\r\n        server backend1.example.com:8080 max_fails=3 fail_timeout=30s;\r\n        server backend2.example.com:8080 max_fails=3 fail_timeout=30s;\r\n        server backend3.example.com:8080 backup;\r\n    }\r\n\r\n    server {\r\n        listen 80;\r\n        server_name example.com;\r\n        \r\n        location \/ {\r\n            proxy_pass http:\/\/backend_servers;\r\n            proxy_set_header X-Real-IP $remote_addr;\r\n            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;\r\n            proxy_set_header Host $host;\r\n            \r\n            # Rate limiting\r\n            limit_req zone=one burst=10 nodelay;\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n
\u81ea\u52d5\u5b89\u5168\u97ff\u61c9\u7cfb\u7d71<\/strong><\/h2>\n
\u4f7f\u7528fail2ban\u5be6\u65bd\u5c0d\u6f5b\u5728\u5a01\u8105\u7684\u81ea\u52d5\u97ff\u61c9\u3002\u4ee5\u4e0b\u662f\u7528\u65bc\u4fdd\u8b77\u5404\u7a2e\u670d\u52d9\u7684\u81ea\u5b9a\u7fa9\u76e3\u7344\u914d\u7f6e\uff1a<\/p>\n
\r\n# \/etc\/fail2ban\/jail.local\r\n[DEFAULT]\r\nbantime = 3600\r\nfindtime = 600\r\nmaxretry = 3\r\n\r\n[ssh]\r\nenabled = true\r\nport = 2222\r\nfilter = sshd\r\nlogpath = \/var\/log\/auth.log\r\nmaxretry = 3\r\n\r\n[nginx-http-auth]\r\nenabled = true\r\nfilter = nginx-http-auth\r\nlogpath = \/var\/log\/nginx\/error.log\r\nmaxretry = 5\r\n\r\n[nginx-botsearch]\r\nenabled = true\r\nfilter = nginx-botsearch\r\nlogpath = \/var\/log\/nginx\/access.log\r\nmaxretry = 2\r\n<\/code><\/pre>\n
\u7dca\u6025\u97ff\u61c9\u5354\u8b70<\/strong><\/h2>\n
\u7576\u6aa2\u6e2c\u5230\u6f5b\u5728\u7684IP\u5c01\u9396\u6642\uff0c\u57f7\u884c\u6b64\u8a3a\u65b7\u5e8f\u5217\uff1a<\/p>\n
\n
\u6aa2\u67e5\u7cfb\u7d71\u65e5\u8a8c\u4e2d\u7684\u53ef\u7591\u6d3b\u52d5\uff1a\n
\r\n# Quick log analysis commands\r\ngrep \"Failed password\" \/var\/log\/auth.log | awk '{print $11}' | sort | uniq -c | sort -nr\r\nnetstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n\r\n<\/code><\/pre>\n<\/li>\n
\u5206\u6790\u7576\u524d\u9023\u63a5\u4e26\u5efa\u7acb\u57fa\u6e96\u6307\u6a19<\/li>\n
\u5728\u8abf\u67e5\u6642\u5be6\u65bd\u81e8\u6642\u56b4\u683c\u7684\u9632\u706b\u7246\u898f\u5247<\/li>\n
\u651c\u5e36\u6536\u96c6\u7684\u8b49\u64da\u806f\u7e6b\u4f3a\u670d\u5668\u79df\u7528\u63d0\u4f9b\u5546<\/li>\n<\/ol>\n
\u4e3b\u52d5\u7dad\u8b77\u8a08\u5283<\/strong><\/h2>\n
\u5be6\u65bd\u6b64\u7dad\u8b77\u8173\u672c\u4ee5\u81ea\u52d5\u57f7\u884c\u5b9a\u671f\u5b89\u5168\u6aa2\u67e5\uff1a<\/p>\n
\r\n#!\/bin\/bash\r\n# server_health_check.sh\r\n\r\n# Check disk usage\r\ndf -h | awk '{ if($5 > \"80%\") print \"WARNING: Partition \" $1 \" is at \" $5 }'\r\n\r\n# Check system load\r\nload_average=$(uptime | awk '{print $10}' | cut -d \",\" -f1)\r\nif (( $(echo \"$load_average > 2\" | bc -l) )); then\r\n    echo \"WARNING: High system load: $load_average\"\r\nfi\r\n\r\n# Check failed login attempts\r\nfailed_logins=$(grep \"Failed password\" \/var\/log\/auth.log | wc -l)\r\nif [ $failed_logins -gt 50 ]; then\r\n    echo \"ALERT: High number of failed login attempts: $failed_logins\"\r\nfi\r\n\r\n# Check open ports\r\nnetstat -tulpn | grep \"LISTEN\"\r\n<\/code><\/pre>\n
\u9577\u671f\u4fdd\u8b77\u7684\u6700\u4f73\u5be6\u8e10<\/strong><\/h2>\n
\u7dad\u6301\u9019\u4e9b\u95dc\u9375\u7684\u5b89\u5168\u63aa\u65bd\uff1a<\/p>\n
\n
\u4f7f\u7528\u81ea\u52d5\u5316\u5de5\u5177\u9032\u884c\u5b9a\u671f\u5b89\u5168\u5be9\u8a08<\/li>\n
\u66f4\u65b0SSL\/TLS\u914d\u7f6e<\/li>\n
\u6b63\u78ba\u7684\u8a2a\u554f\u63a7\u5236\u5217\u8868\uff08ACL\uff09<\/li>\n
\u5b9a\u671f\u5099\u4efd\u9a57\u8b49<\/li>\n<\/ul>\n
\u4ee5\u4e0b\u662f\u63a8\u85a6\u7684Web\u4f3a\u670d\u5668SSL\u914d\u7f6e\uff1a<\/p>\n
\r\nssl_protocols TLSv1.2 TLSv1.3;\r\nssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256;\r\nssl_prefer_server_ciphers off;\r\nssl_session_timeout 1d;\r\nssl_session_cache shared:SSL:50m;\r\nssl_session_tickets off;\r\nssl_stapling on;\r\nssl_stapling_verify on;\r\n<\/code><\/pre>\n
\u7d50\u8ad6<\/strong><\/h2>\n
\u5728\u7f8e\u570b\u4f3a\u670d\u5668\u79df\u7528\u74b0\u5883\u4e2d\u7dad\u8b77\u826f\u597d\u7684IP\u4fe1\u8b7d\u9700\u8981\u6301\u7e8c\u7684\u8b66\u60d5\u548c\u4e3b\u52d5\u7ba1\u7406\u3002\u901a\u904e\u5be6\u65bd\u9019\u4e9b\u6280\u8853\u63aa\u65bd\u548c\u76e3\u63a7\u7cfb\u7d71\uff0c\u60a8\u53ef\u4ee5\u986f\u8457\u964d\u4f4eIP\u88ab\u5c01\u9396\u7684\u98a8\u96aa\uff0c\u540c\u6642\u78ba\u4fdd\u6700\u4f73\u7684\u4f3a\u670d\u5668\u6548\u80fd\u3002\u8acb\u8a18\u4f4f\u5b9a\u671f\u66f4\u65b0\u5b89\u5168\u5354\u8b70\uff0c\u4e26\u53ca\u6642\u4e86\u89e3\u4f3a\u670d\u5668\u79df\u7528\u74b0\u5883\u4e2d\u51fa\u73fe\u7684\u65b0\u5a01\u8105\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4f3a\u670d\u5668IP\u5c01\u9396\u4f9d\u7136\u662f\u7ba1\u7406\u7f8e\u570b\u4f3a\u670d\u5668\u79df\u7528\u670d\u52d9\u7684\u7cfb\u7d71\u7ba1\u7406\u54e1\u9762\u81e8\u7684\u95dc\u9375\u6311\u6230\u3002\u672c\u7d9c\u5408\u6307\u5357\u6df1\u5165\u63a2\u8a0e\u6280\u8853\u89e3\u6c7a\u65b9\u6848\u548c\u9810\u9632\u63aa\u65bd […]<\/p>\n
Read More…<\/a><\/p>\n","protected":false},"author":3,"featured_media":20827,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4815],"tags":[5445,4849,3742,2239,852],"class_list":["post-20840","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-america-dedicated-server-tc","tag-ip-blocking-prevention-tc","tag-us-hosting-tc","tag-firewall-configuration-tc","tag-ddos-protection-tc","tag-server-security-tc"],"acf":[],"yoast_head":"\n