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.
Альбина
3 minViews1
GENERAL IT · JOURNAL
Tips and solutions
Practical tips and verified solutions for Linux, servers and websites.
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 minViews1
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
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.
Альбина
3 minViews2
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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3 minViews4
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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3 minViews3
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
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 minViews2
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