Linux Knowledge & Troubleshooting Guides
Showing all verified technical guides and diagnostic steps in the linux category.
How to Fix 'ssh: connect to host port 22: Connection refused' on Linux
Diagnose and resolve SSH port 22 connection refused errors caused by stopped sshd daemons, local firewalls, custom port mismatches, or Fail2ban IP blocks.
How to Troubleshoot High CPU Usage on a Linux Server
A step-by-step diagnostic guide to isolate runaway processes, high system load, and thread contention on production Linux servers using top, pidstat, and mpstat.
How to Troubleshoot High Load and CPU Spikes on a Production Linux Server
A methodical diagnosis guide to isolate runaway PHP-FPM workers, MySQL lockups, unindexed queries, and stuck cron jobs using top, htop, and iotop.
How to Fix “No Space Left on Device” on a Linux Server
A comprehensive troubleshooting guide to resolve Linux disk full errors, find large directories, identify inode exhaustion, and release deleted files held open by active processes.
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