📖 ~1 min read
Table of contents
Symptom & Impact
NFS client mounts hang or timeout, delaying app startup and batch jobs dependent on shared storage.
Environment & Reproduction
Appears after firewall policy tightening, SELinux mode changes, or rpcbind service restart failures.
Root Cause Analysis
Required NFS/rpc ports blocked by firewalld or SELinux booleans/context do not permit expected access.
Quick Triage
Check `systemctl status nfs-server rpcbind`, test reachability, and list active firewalld services on server.
Step-by-Step Diagnosis
Inspect mount debug output, review `journalctl -u nfs-server`, and confirm AVC or firewall deny events.
Solution – Primary Fix
Open required firewalld NFS services, set needed SELinux booleans, restart service stack, and remount.
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Solution – Alternative Approaches
Use fixed rpc port configuration and explicit allow rules to simplify segmented network operations.
Verification & Acceptance Criteria
Mounts succeed reliably and read/write tests pass from authorized client nodes.
Rollback Plan
Revert policy changes and return to last known-good export and network rule set.
Prevention & Hardening
Template NFS firewall and SELinux settings, and include mount validation in change management.
Related Errors & Cross-Refs
`firewall-cmd –add-service=nfs –permanent && firewall-cmd –reload && journalctl -u nfs-server -n 100`
Related tutorial: View the step-by-step tutorial for rhel-7.
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Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
RHEL 7 storage networking docs for NFS, firewalld policy, and SELinux integration.
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