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Protects SSH, Nginx, Apache, Postfix, and any service with log-based authentication.\n\n## Instructions\n\n### Step 1: Install\n\n```bash\nsudo apt install fail2ban\nsudo systemctl enable fail2ban\n```\n\n### Step 2: Configure\n\n```ini\n# \u002Fetc\u002Ffail2ban\u002Fjail.local — Custom configuration (never edit jail.conf)\n[DEFAULT]\nbantime = 1h\nfindtime = 10m\nmaxretry = 5\nbanaction = iptables-multiport\n\n[sshd]\nenabled = true\nport = ssh\nmaxretry = 3\nbantime = 24h\n\n[nginx-http-auth]\nenabled = true\nport = http,https\nmaxretry = 5\n\n[nginx-botsearch]\nenabled = true\nport = http,https\nmaxretry = 2\nbantime = 7d\n```\n\n### Step 3: Monitor\n\n```bash\nsudo fail2ban-client status               # list active jails\nsudo fail2ban-client status sshd           # show banned IPs\nsudo fail2ban-client set sshd unbanip 1.2.3.4   # unban\nsudo fail2ban-client set sshd banip 5.6.7.8     # manual ban\n```\n\n## Guidelines\n\n- Always create jail.local — jail.conf gets overwritten on updates.\n- Start conservative: 5 retries, 1h ban. Adjust based on logs.\n- For modern alternative with community threat sharing, consider CrowdSec.\n- Use `fail2ban-regex` to test custom filters before deploying.\n",{},"main","def8531e65114c0fca8fb8551c1871ee0eed705c","skills\u002FTerminalSkills\u002Fskills\u002Ffail2ban",24,"https:\u002F\u002Fgithub.com\u002FComeOnOliver\u002Fskillshub","https:\u002F\u002Fskillshub.wtf","https:\u002F\u002Fgithub.com\u002FComeOnOliver","AI & Blockchain Engineer\r\n","2026-06-24 22:07:19",{"source":7,"skillName":5,"commands":32,"prompt":42,"zipAvailable":43},[33,36,39],{"tool":34,"command":35},"npx","npx skills add ComeOnOliver\u002Fskillshub --skill fail2ban",{"tool":37,"command":38},"bunx","bunx skills add ComeOnOliver\u002Fskillshub --skill fail2ban",{"tool":40,"command":41},"pnpm","pnpm dlx skills add ComeOnOliver\u002Fskillshub --skill fail2ban","安装技能，技能地址：https:\u002F\u002Fgithub.com\u002FComeOnOliver\u002Fskillshub\u002Fblob\u002Fmain\u002Fskills\u002FTerminalSkills\u002Fskills\u002Ffail2ban\u002FSKILL.md",true,[],[46,60,70,79,85,92],{"skillNo":47,"name":48,"nameZh":6,"description":6,"descriptionZh":6,"repositoryFullName":7,"ownerLogin":8,"ownerAvatarUrl":9,"ownerAccountNo":10,"ownerDisplayName":11,"repositoryNo":12,"starsCount":13,"licenseSpdxId":14,"licenseFileUrl":6,"sourceHtmlUrl":49,"categories":50,"keywords":56,"publishedAt":18},"01M6FKJN13GMG4KY57J3QD8GY5","model-hierarchy-skill","https:\u002F\u002Fgithub.com\u002FComeOnOliver\u002Fskillshub\u002Fblob\u002Fmain\u002Fskills\u002Fzscole\u002Fmodel-hierarchy-skill\u002Fmodel-hierarchy-skill\u002FSKILL.md",[51],{"categoryNo":52,"categoryName":53,"taxonomyType":54,"taxonomyTypeDesc":55},"01JBSEEDCAT000000000000023","Skill与智能体开发","SCENARIO","使用场景",[57,58,59],"model","model hierarchy","model hierarchy skill",{"skillNo":61,"name":62,"nameZh":6,"description":6,"descriptionZh":6,"repositoryFullName":7,"ownerLogin":8,"ownerAvatarUrl":9,"ownerAccountNo":10,"ownerDisplayName":11,"repositoryNo":12,"starsCount":13,"licenseSpdxId":14,"licenseFileUrl":6,"sourceHtmlUrl":63,"categories":64,"keywords":66,"publishedAt":18},"01M6FKJJJ6GCAMR4PPPRD12M5X","zoom-mcp","https:\u002F\u002Fgithub.com\u002FComeOnOliver\u002Fskillshub\u002Fblob\u002Fmain\u002Fskills\u002Fzoom\u002Fskills\u002Fzoom-mcp\u002FSKILL.md",[65],{"categoryNo":52,"categoryName":53,"taxonomyType":54,"taxonomyTypeDesc":55},[67,68,69],"MCP","zoom","zoom mcp",{"skillNo":71,"name":72,"nameZh":6,"description":6,"descriptionZh":6,"repositoryFullName":7,"ownerLogin":8,"ownerAvatarUrl":9,"ownerAccountNo":10,"ownerDisplayName":11,"repositoryNo":12,"starsCount":13,"licenseSpdxId":14,"licenseFileUrl":6,"sourceHtmlUrl":73,"categories":74,"keywords":75,"publishedAt":18},"01M6FKJE3KYT3KPEZMEEHYKA6K","zoom-apps-sdk","https:\u002F\u002Fgithub.com\u002FComeOnOliver\u002Fskillshub\u002Fblob\u002Fmain\u002Fskills\u002Fzoom\u002Fskills\u002Fzoom-apps-sdk\u002FSKILL.md",[],[76,77,78,68],"sdk","zoom apps sdk","apps",{"skillNo":80,"name":81,"nameZh":6,"description":6,"descriptionZh":6,"repositoryFullName":7,"ownerLogin":8,"ownerAvatarUrl":9,"ownerAccountNo":10,"ownerDisplayName":11,"repositoryNo":12,"starsCount":13,"licenseSpdxId":14,"licenseFileUrl":6,"sourceHtmlUrl":82,"categories":83,"keywords":84,"publishedAt":18},"01M6FKJ9EDH9Q5VWDF8HAJRSP0","windows","https:\u002F\u002Fgithub.com\u002FComeOnOliver\u002Fskillshub\u002Fblob\u002Fmain\u002Fskills\u002Fzoom\u002Fskills\u002Fwindows\u002FSKILL.md",[],[81],{"skillNo":86,"name":87,"nameZh":6,"description":6,"descriptionZh":6,"repositoryFullName":7,"ownerLogin":8,"ownerAvatarUrl":9,"ownerAccountNo":10,"ownerDisplayName":11,"repositoryNo":12,"starsCount":13,"licenseSpdxId":14,"licenseFileUrl":6,"sourceHtmlUrl":88,"categories":89,"keywords":91,"publishedAt":18},"01M6FKJ666BEEFC3AE9GJ72Q93","whiteboard","https:\u002F\u002Fgithub.com\u002FComeOnOliver\u002Fskillshub\u002Fblob\u002Fmain\u002Fskills\u002Fzoom\u002Fskills\u002Fwhiteboard\u002FSKILL.md",[90],{"categoryNo":52,"categoryName":53,"taxonomyType":54,"taxonomyTypeDesc":55},[87],{"skillNo":93,"name":94,"nameZh":6,"description":6,"descriptionZh":6,"repositoryFullName":7,"ownerLogin":8,"ownerAvatarUrl":9,"ownerAccountNo":10,"ownerDisplayName":11,"repositoryNo":12,"starsCount":13,"licenseSpdxId":14,"licenseFileUrl":6,"sourceHtmlUrl":95,"categories":96,"keywords":97,"publishedAt":18},"01M6FKJ21WFCDGTJQ2Q91T9DVW","websockets","https:\u002F\u002Fgithub.com\u002FComeOnOliver\u002Fskillshub\u002Fblob\u002Fmain\u002Fskills\u002Fzoom\u002Fskills\u002Fwebsockets\u002FSKILL.md",[],[94]]