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XK0-006 Practice Question: A Linux server runs a web application that…
A Linux server runs a web application that frequently runs out of file descriptors. Which configuration change would permanently increase the maximum number of open files for all users?
⚠ Common exam trap
Many candidates confuse the system-wide kernel parameter 'fs.file-max' (Option A) with the per-user PAM limits in limits.conf, assuming that raising the kernel value alone will resolve per-process file descriptor exhaustion.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Edit /etc/security/limits.conf and add 'soft nofile 65536' and 'hard nofile 65536'
Editing /etc/security/limits.conf with both 'soft nofile' and 'hard nofile' entries permanently raises the per-user limit on open file descriptors for all users (or specified users/groups) at login. The soft limit is the current working limit, while the hard limit is the maximum ceiling; setting both ensures the user can reach the desired value without needing to run ulimit with root privileges.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Set 'fs.file-max = 65536' in /etc/sysctl.conf
Why it's wrong here
Sets system limit, not per-user.
- ✗
Add 'session required pam_limits.so' to /etc/pam.d/login
Why it's wrong here
pam_limits.so is already included; this enables limits but doesn't set values.
- ✗
Run 'ulimit -n 65536' in a startup script
Why it's wrong here
Only affects current shell session.
- ✓
Edit /etc/security/limits.conf and add 'soft nofile 65536' and 'hard nofile 65536'
Why this is correct
Correct file and syntax.
Go deeper
Related to this question
Learn chapter
Linux Fundamentals and History
Key term
User
A user is any person, system, or device that interacts with an IT service, resource, or identity system, typically authenticated through credentials and authorized to perform specific actions.
Key term
Value
Value is the perceived worth, benefit, or usefulness that a service, product, or activity delivers to stakeholders, especially customers and the business.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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