{"id":74,"date":"2025-06-04T21:36:53","date_gmt":"2025-06-04T20:36:53","guid":{"rendered":"https:\/\/blog.mkcloudai.com\/?p=74"},"modified":"2025-06-04T21:36:53","modified_gmt":"2025-06-04T20:36:53","slug":"daily-system-admin-commands","status":"publish","type":"post","link":"https:\/\/blog.mkcloudai.com\/?p=74","title":{"rendered":"Daily system admin commands"},"content":{"rendered":"\n

\ud83d\uddc2\ufe0f CATEGORIES:<\/h4>\n\n\n\n
    \n
  1. \u2705 System Monitoring & Info<\/strong><\/li>\n\n\n\n
  2. \ud83d\udd10 Security & Access<\/strong><\/li>\n\n\n\n
  3. \ud83d\udcc1 Log Management<\/strong><\/li>\n\n\n\n
  4. \ud83d\udce1 Network & Firewall<\/strong><\/li>\n\n\n\n
  5. \u2699\ufe0f Automation & Backup<\/strong><\/li>\n\n\n\n
  6. \ud83d\udce6 Package & Service Management<\/strong><\/li>\n\n\n\n
  7. \ud83e\udde0 Custom Scripts \/ Misc<\/strong><\/li>\n<\/ol>\n\n\n\n

    \u2705 1. SYSTEM MONITORING & INFO<\/h4>\n\n\n\n
    Command<\/th>Description<\/th><\/tr><\/thead>
    uptime<\/code><\/td>Shows how long the system has been running and load average.<\/td><\/tr>
    who<\/code><\/td>Shows who is logged in.<\/td><\/tr>
    w<\/code><\/td>Displays who is logged in and what they are doing.<\/td><\/tr>
    top<\/code><\/td>Real-time view of CPU\/memory usage.<\/td><\/tr>
    df -h<\/code><\/td>Shows disk usage in human-readable format.<\/td><\/tr>
    free -m<\/code><\/td>Shows memory usage in MB.<\/td><\/tr>
    hostname -I<\/code><\/td>Displays local IP address.<\/td><\/tr>
    ps aux<\/code><\/td>Lists all running processes.<\/td><\/tr>
    lsof<\/code><\/td>Lists open files, often used to trace processes using a file.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    \ud83d\udd10 2. SECURITY & ACCESS<\/h4>\n\n\n\n
    Command<\/th>Description<\/th><\/tr><\/thead>
    last<\/code><\/td>Lists login history.<\/td><\/tr>
    lastb<\/code><\/td>Lists failed login attempts (uses \/var\/log\/btmp<\/code>).<\/td><\/tr>
    whoami<\/code><\/td>Shows current logged-in user.<\/td><\/tr>
    id<\/code><\/td>Shows user ID and groups.<\/td><\/tr>
    sudo ufw status<\/code><\/td>Displays current UFW firewall rules.<\/td><\/tr>
    sudo ufw allow 5000\/tcp<\/code><\/td>Allows incoming traffic on port 5000.<\/td><\/tr>
    sudo ufw allow from YOUR.IP.ADDRESS to any port 5000<\/code><\/td>Allows only your IP to access port 5000.<\/td><\/tr>
    sudo ufw deny from IP_ADDRESS<\/code><\/td>Blocks specific IP address.<\/td><\/tr>
    sudo fail2ban-client status<\/code><\/td>Checks fail2ban status.<\/td><\/tr>
    journalctl -u ssh<\/code><\/td>View logs for SSH service.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \n\n\n\n

    \ud83d\udcc1 3. LOG MANAGEMENT<\/h4>\n\n\n\n
    Command<\/th>Description<\/th><\/tr><\/thead>
    cat \/var\/log\/auth.log<\/code><\/td>View authentication-related logs.<\/td><\/tr>
    cat \/var\/log\/syslog<\/code><\/td>General system activity logs.<\/td><\/tr>
    zcat \/var\/log\/syslog.1.gz<\/code><\/td>View compressed logs (rotated).<\/td><\/tr>
    logrotate<\/code><\/td>Tool for automatic log rotation.<\/td><\/tr>
    tar -czf logs-YYYY-MM-DD.tar.gz \/var\/log<\/code><\/td>Archive logs manually.<\/td><\/tr>
    sha256sum logs-*.tar.gz<\/code><\/td>Create checksum to verify archive integrity.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \n\n\n\n

    \ud83d\udce1 4. NETWORK & FIREWALL<\/h4>\n\n\n\n
    Command<\/th>Description<\/th><\/tr><\/thead>
    curl http:\/\/127.0.0.1:5000\/<\/code><\/td>Test local Flask server access.<\/td><\/tr>
    curl http:\/\/checkip.amazonaws.com<\/code><\/td>Get public IP address from AWS.<\/td><\/tr>
    netstat -tuln<\/code><\/td>Show listening ports.<\/td><\/tr>
    ss -tuln<\/code><\/td>Modern alternative to netstat.<\/td><\/tr>
    sudo ufw enable\/disable<\/code><\/td>Turn UFW firewall on or off.<\/td><\/tr>
    iptables -L<\/code><\/td>View current iptables rules.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \n\n\n\n

    \u2699\ufe0f 5. AUTOMATION & BACKUP<\/h4>\n\n\n\n
    Command<\/th>Description<\/th><\/tr><\/thead>
    crontab -e<\/code><\/td>Edit crontab for scheduling tasks.<\/td><\/tr>
    mkdir -p \/mnt\/secure-logs<\/code><\/td>Create archive directory.<\/td><\/tr>
    tar -czf \/mnt\/secure-logs\/logs-YYYY-MM-DD.tar.gz \/var\/log<\/code><\/td>Archive logs with compression.<\/td><\/tr>
    bash check-secure.sh<\/code><\/td>Run a custom security audit script.<\/td><\/tr>
    python3 app.py<\/code><\/td>Run your Flask dashboard.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \n\n\n\n

    \ud83d\udce6 6. PACKAGE & SERVICE MANAGEMENT<\/h4>\n\n\n\n
    Command<\/th>Description<\/th><\/tr><\/thead>
    pip install flask<\/code><\/td>Install Flask (Python package).<\/td><\/tr>
    sudo apt update && sudo apt upgrade<\/code><\/td>Update system packages.<\/td><\/tr>
    systemctl status ssh<\/code><\/td>Check SSH service status.<\/td><\/tr>
    systemctl restart ssh<\/code><\/td>Restart SSH service.<\/td><\/tr>
    sudo systemctl enable fail2ban<\/code><\/td>Enable fail2ban at boot.<\/td><\/tr>
    sudo apt install fail2ban<\/code><\/td>Install fail2ban.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \n\n\n\n

    \ud83e\udde0 7. CUSTOM \/ OTHER<\/h4>\n\n\n\n
    Command<\/th>Description<\/th><\/tr><\/thead>
    ls -l<\/code><\/td>List files with details.<\/td><\/tr>
    chmod +x script.sh<\/code><\/td>Make script executable.<\/td><\/tr>
    .\/script.sh<\/code><\/td>Run a shell script in the current directory.<\/td><\/tr>
    echo \"hello\"<\/code><\/td>Print text to terminal.<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"

    \ud83d\uddc2\ufe0f CATEGORIES: \u2705 1. SYSTEM MONITORING & INFO Command Description uptime Shows how long the system has been running and […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[9],"tags":[25,24,23,26,20],"class_list":["post-74","post","type-post","status-publish","format-standard","hentry","category-tutorial","tag-authentication","tag-fail2ban","tag-linux-command","tag-log","tag-ssh"],"_links":{"self":[{"href":"https:\/\/blog.mkcloudai.com\/index.php?rest_route=\/wp\/v2\/posts\/74","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.mkcloudai.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.mkcloudai.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.mkcloudai.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.mkcloudai.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=74"}],"version-history":[{"count":1,"href":"https:\/\/blog.mkcloudai.com\/index.php?rest_route=\/wp\/v2\/posts\/74\/revisions"}],"predecessor-version":[{"id":75,"href":"https:\/\/blog.mkcloudai.com\/index.php?rest_route=\/wp\/v2\/posts\/74\/revisions\/75"}],"wp:attachment":[{"href":"https:\/\/blog.mkcloudai.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=74"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.mkcloudai.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=74"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.mkcloudai.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=74"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}