Why dig and the app see different addresses: checking resolvectl
How to view DNS servers and name resolution rules in a systemd-resolved system, especially with VPNs and multiple network interfaces.
Альбина
3 minViews3
GENERAL IT · JOURNAL
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Practical tips and verified solutions for Linux, servers and websites.
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How to Check a DNS Record with dig and Read the Response Correctly
How to read a dig DNS response: real examples of NOERROR with addresses, empty NODATA responses, and NXDOMAIN. Status, TTL, and the next verification step without changing the network.
Альбина
6 minViews3
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.
Альбина
3 minViews6
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 minViews2
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 minViews6
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 minViews9
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 minViews3
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.
Альбина
3 minViews6
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
3 minViews9
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
3 minViews5
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
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.
Альбина
3 minViews5
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