How to Check Server IP Addresses and Routes Without Changing the Network
Quick diagnostics with ip: interfaces, addresses, and the selected route to the recipient. Helps gather facts without risking loss of remote access.
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3 minViews3
GENERAL IT · JOURNAL
Tips and solutions
Practical tips and verified solutions for Linux, servers and websites.
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Scheduled Task Did Not Run: Checking the systemd Timer
How to link a timer to the service it launches, verify past and next executions, and avoid mistaking an active timer for a successful task.
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How to Find the Right Error in the systemd Journal Using journalctl
Filter messages by service, boot, and time to analyze a specific failure without dumping the entire journal and losing critical lines.
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Service not working: what to check with systemctl before restarting
How to read the systemd service state, distinguish process startup from application readiness, and gather facts before changing the server state.
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3 minViews2
What Load Average Means and When a High Value Requires Investigation
We explain Linux load average: why it cannot be read as CPU percentages and how to correlate it with the number of processors and resource wait times.
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Free Gigabytes Are Available, But the File Won't Create: Check Inodes
We analyze the situation where Linux reports no space despite free disk capacity: how to check inodes and find directories with a high number of files.
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Why df and du Report Different Disk Usage
How to identify the filesystem running out of space and compare its metrics with directory sizes without blindly deleting data.
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Why Cron Does Not Run a Task That Works in the Terminal
Check the user, schedule, and Cron environment without manually re-running a potentially dangerous task or modifying crontab.
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3 minViews2
Which disk holds the catalog: checking with lsblk and findmnt
How to link a site path to a mount point and block device without confusing disk size, partition, and file system.
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3 minViews3
How to Read EXPLAIN for SELECT in MySQL Without Hasty Conclusions
First look at the query plan: selected indexes, row estimates, and access order. We explain why EXPLAIN ANALYZE requires a separate solution.
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3 minViews3
Too Many MySQL Connections: Which Metrics to Check First
Compare current connections, active threads, and the server limit to identify the cause of failures before increasing the connection limit.
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3 minViews2
Why the PHP Version in the Terminal Differs from the Site Version
Examining CLI and PHP-FPM: How to Check the Command-Line Environment and Understand Why Its Settings Do Not Guarantee Web Request Configuration
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3 minViews4
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