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.
Альбина
3 minViews5
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Альбина
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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.
Альбина
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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.
Альбина
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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.
Альбина
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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.
Альбина
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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.
Альбина
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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.
Альбина
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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.
Альбина
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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
Альбина
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What to Check in Nginx Configuration Before Applying It
How to determine the version and build parameters, verify the configuration, and distinguish between a successful file check and the actual application of settings.
Альбина
3 minViews4
How to verify a tar.gz archive before extraction
How to verify tar.gz before extraction: gzip and tar commands, exit codes, and five real-world examples. Why a file list and even exit code 0 do not guarantee a backup is usable.
Альбина
5 minViews5