Linux Admin Task

You're right! Networking troubleshooting is a key part of a Linux admin's daily tasks. Here’s the updated checklist, now including network troubleshooting along with log rotation, mounting, and other system administration duties. --- ## Linux Admin Daily, Weekly, and Monthly Tasks ### Daily Tasks: 1. System Health Checks - Monitor CPU, memory, and disk usage (top, htop, free -m, df -h). - Check system load (uptime). - Verify running services (systemctl list-units --failed). 2. Log Monitoring & Rotation - Check logs (journalctl -xe, tail -f /var/log/syslog). - Ensure log rotation is running (logrotate -d /etc/logrotate.conf). 3. User & Permission Management - Manage users (useradd, usermod, passwd, userdel). - Set correct file permissions (chmod, chown, setfacl). 4. Service & Process Management - Restart failed services (systemctl restart <service>). - Check running processes (ps aux, htop). 5. Storage & Mounting Checks - Check mounted filesystems (mount, df -Th). - Verify disk usage (du -sh /home/*). - Ensure auto-mounting works (cat /etc/fstab, mount -a). 6. Networking Troubleshooting - Check network interface status (ip a, ifconfig). - Verify connectivity (ping -c 4 8.8.8.8). - Test DNS resolution (nslookup google.com or dig google.com). - Check routing issues (ip route show, traceroute 8.8.8.8). - Identify listening ports (ss -tulnp, netstat -tulnp). - Restart network services if needed (systemctl restart networking, nmcli networking on). 7. Backup & Restore - Verify backups (rsync, tar, cron jobs). - Restore a test backup to confirm integrity. 8. Security & Access Control - Monitor failed SSH logins (grep "Failed password" /var/log/auth.log). - Verify firewall rules (iptables -L, firewalld --list-all). - Scan for open ports (nmap -sT localhost). --- ### Weekly Tasks: 1. Patch & Update Systems - Update OS and packages (apt update && apt upgrade or yum update). - Reboot if required. 2. Storage & Filesystem Maintenance - Clean up unused logs (find /var/log -type f -name "*.log" -mtime +30 -delete). - Check and repair disk errors (fsck -y /dev/sdX). - Review disk quotas (quota -v, repquota -a). 3. Networking Performance & Troubleshooting - Check bandwidth usage (iftop, nload). - Detect network latency (mtr google.com). - Debug packet loss (tcpdump -i eth0 host 8.8.8.8). 4. Backup & Disaster Recovery - Restore a test backup. - Validate DR (Disaster Recovery) strategies. --- ### Monthly Tasks: 1. Audit Logs & Security - Review logs (grep "error" /var/log/*). - Audit sudo usage (grep "sudo" /var/log/auth.log). - Check for security vulnerabilities (lynis audit system). 2. Networking Optimization & Security - Analyze network traffic (tcpdump -i eth0). - Check active connections (netstat -an | grep ESTABLISHED). - Optimize firewall rules (iptables-save > /etc/iptables.rules). 3. Storage & Mounting Management - Check disk failures (smartctl -H /dev/sdX). - Expand LVM partitions if needed (lvextend, resize2fs). 4. System Performance Optimization - Analyze performance metrics (vmstat, iostat). - Tune database performance (my.cnf, postgresql.conf). 5. Update Documentation & Incident Reports - Log all major system changes. - Review and update disaster recovery plans. --- Now it covers log rotation, mounting, storage, and networking troubleshooting. Would you like me to create bash scripts for some of these tasks?