Process Terminated Abruptly: How to Confirm OOM in Ubuntu 24.04
Check the kernel log, systemd-oomd, and cgroup limits to distinguish memory exhaustion from similar failures and preserve facts before changes.
Михаил
5 minViews3
GENERAL IT · JOURNAL
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Why Businesses Lose Customers Online
We examine what hinders small businesses from attracting customers online—from outdated websites to weak positioning
Steal Time on VPS: How to Check CPU Wait in Linux
The st column helps detect CPU wait at the virtualization level. A quick vmstat check, its result thresholds, and data for a targeted inquiry to the provider.
Михаил
5 minViews2
How to Validate a JSON File with jq Before Importing to a Store
Check syntax, empty files, multiple documents in sequence, and the top-level type. Read commands with verified examples for jq 1.7.
Денис
4 minViews2
Package Updated, But Process Uses Old Library: Checking needrestart
In Ubuntu, we read the list of processes with outdated libraries without automatic restart and separate the result from the disk state of packages.
Михаил
5 minViews2
The site is not accessible to everyone: check IPv4 and IPv6 separately via curl
Two comparable requests help reveal differences in network paths, HTTP responses, and HTTPS errors without changing DNS or server settings.
Михаил
4 minViews3
Which SSH Settings Apply to a Specific User
Read the effective OpenSSH configuration considering Match directives and login parameters without modifying files or restarting the service.
Михаил
5 minViews3
DNS Record Created, but NXDOMAIN Persists: Checking Negative Cache
Compare the authoritative response with the resolver's response using dig, read the SOA record, and calculate the negative cache duration without modifying DNS.
Михаил
5 minViews1
How to Find Long-Running Transactions in MySQL 8.4 Without Terminating Connections
Transaction age and lock wait duration are distinct metrics. Two read-only queries help identify old InnoDB transactions and gather data for further investigation.
Альбина
6 minViews2
How much space do systemd journals occupy: checking without cleanup
Two read-only commands help estimate journal volume and locate their configuration sources in Ubuntu 24.04. We explain result boundaries and the differences between persistent and volatile storage.
Альбина
5 minViews1
File system became read-only: diagnostics in Ubuntu 24.04
Determine the mount mode for the application directory and search for preceding kernel messages. The commands do not remount partitions or repair the file system; the result helps select the next recovery procedure.
Альбина
6 minViews6
Too Many Open Files: Checking the Limit of a Running Process
The error may affect a single process even if free memory and disk space remain. The Ubuntu 24.04 guide shows where to read the active limit and how to distinguish it from the current terminal settings.
Альбина
5 minViews4
How to Read PSI in Linux: Check CPU, Memory, and Disk Pressure
What /proc/pressure files show, how to distinguish resource busy time from wait time, and how to use avg10, avg60, avg300, and total without false thresholds.
Альбина
5 minViews4
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