References
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Fix Linux application permissions without chmod 777
A Linux permission error can concern the file, a parent directory, a service sandbox or a securit...
Collect disk I/O evidence without running a write benchmark
Slow saves or database requests can come from storage waits, CPU contention, application locks or...
Check memory pressure inside a Linux VPS
Linux uses spare RAM for caches, so a small free-memory figure is not enough to diagnose exhausti...
Handle APT and dpkg lock messages safely
APT and dpkg serialize package changes using locks. A lock message often means an automatic updat...
Test Certbot renewal without replacing a working certificate
A currently valid HTTPS certificate does not prove that renewal will work. DNS, challenge routing...
Run an application with a dedicated systemd service account
A dedicated service account limits which files an application can modify. It also makes ownership...
Find which Linux process is using a port
An address-already-in-use error means another socket conflicts with the requested bind. It does n...
Diagnose cron jobs that work only in an interactive shell
A command that succeeds in your SSH shell can fail under cron because the account, environment an...
Schedule a controlled task with a systemd timer
A systemd timer separates a schedule from the service that performs the work. This makes status a...
Find disk space held by deleted but open Linux files
Deleting a large log does not always make its disk space available immediately. If a running proc...
Distinguish a container memory limit from a VPS out-of-memory event
An application can run out of memory while the VPS still has free RAM. A container, service or pa...
Diagnose Too many open files on a Linux service
“Too many open files” can prevent a web server from accepting connections or an application from ...