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Table of contents
Symptom & Impact
Systems boot slowly or drop into emergency mode because NFS paths fail to mount. Services depending on mounted data remain unavailable and startup automation chains break.
Environment & Reproduction
Common when fstab NFS entries lack _netdev or automount options and network-online ordering is incomplete. Reproduce by rebooting with delayed network and strict mount dependencies.
Root Cause Analysis
Mount units start before network is fully ready, causing timeout and dependency failure. Missing systemd directives or legacy assumptions from service scripts create incorrect ordering.
Quick Triage
Review failed mounts with systemctl –failed, inspect journalctl -b for mount timing, and confirm network-online.target behavior. Validate NFS server reachability and firewalld allowance for required ports.
Step-by-Step Diagnosis
Inspect generated mount units from fstab, test manual mount after boot, and compare boot dependency graphs. Determine whether timing, DNS, or ACL issues prevent early mount success.
Solution – Primary Fix
Add _netdev and suitable x-systemd.automount/noauto options in fstab, ensure network-online wait is configured, then daemon-reload and reboot. Use systemctl or service workflows to validate NFS-related services.
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Solution – Alternative Approaches
Use autofs for on-demand mounting, add explicit After=network-online.target for dependent services, or move startup data locally for critical boot paths.
Verification & Acceptance Criteria
Host should boot without emergency mode, NFS mounts should appear reliably, and dependent services should start cleanly. journalctl must show successful mount attempts after network readiness.
Rollback Plan
Revert fstab modifications and restore previous mount behavior. If boot risk is high, temporarily disable problematic mounts and provide local fallback paths while investigating.
Prevention & Hardening
Standardize NFS mount templates with _netdev and automount policies. Monitor mount latency and boot failures, and keep SELinux/firewalld/NFS policy compatibility under change control.
Related Errors & Cross-Refs
Related messages include Dependency failed for Remote File Systems and mount timeout. Cross-reference DNS availability, NFS export ACLs, and network service startup sequencing.
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
Consult systemd.mount, fstab, and Red Hat NFS deployment guidance. Include tested boot-order patterns in platform engineering standards.
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