Generated banner for Google Cloud Filestore Log Troubleshooting
Generated logo for Google Cloud Filestore Log Troubleshooting

Google Cloud Filestore Log Troubleshooting

GoogleOfficialPublished by Google

  • Skill
  • Workflow
  • Cloud and DevOps
  • Apache-2.0
  • Low risk
  • Has scripts

From the author

Diagnoses and resolves Filestore client mount failures on Google Cloud, permission errors (EACCES), and network timeouts (ETIMEDOUT). Use when an NFS mount hangs or fails from a Compute Engine VM, GKE pod, Cloud Run service, or Vertex AI workload, when `mount.nfs` reports "Connection timed out" or "access denied by server", when checking whether VPC ingress firewall rules or `nfsExportOptions` allow a client IP, or when a previously working Filestore share suddenly stops mounting after an administrative change. Don't use for Cloud Storage (GCS) buckets, Persistent Disk, or Cloud NetApp Volumes, and don't use for Filestore capacity scaling or backup and export-policy auditing.
— the description by Google

AutoGineer summary

Written by AutoGineer from the skill’s own files, not by the author

This skill provides a structured diagnostic workflow for troubleshooting Google Cloud Filestore mount issues. It helps identify the root causes of common NFS errors like EACCES (permission denied) and ETIMEDOUT (network timeouts) occurring on Compute Engine VMs, GKE pods, Cloud Run, or Vertex AI workloads. The workflow includes steps for verifying VPC ingress firewall rules, inspecting nfsExportOptions, and checking Cloud Audit Logs for recent configuration drift, ensuring a systematic approach to restoring connectivity.

What it does

  • Identifies root causes for NFS mount failures including EACCES and ETIMEDOUT.
  • Evaluates nfsExportOptions to ensure client IP or subnet access is correctly configured.
  • Inspects VPC ingress firewall rules for required NFS ports 2049 and 111.
  • Scans Cloud Audit Logs to detect recent administrative configuration changes.
  • Provides remediation commands for firewall and export ACL updates.
  • Supports GKE-specific troubleshooting by accounting for node-level network architecture.

When to use it

  • When an NFS mount hangs or fails with 'Connection timed out' or 'access denied by server'.
  • After an administrative change causes a previously working Filestore share to stop mounting.
  • When verifying if VPC firewall rules or export ACLs allow access from a specific client IP.
  • When troubleshooting GKE CSI driver mount errors in the kube-system namespace.

Advantages

  • Reduces mean time to resolution for common Filestore connectivity issues.
  • Prevents destructive changes by requiring explicit user confirmation for all remediations.
  • Provides clear, attributed commands for consistent diagnostic execution.
  • Distinguishes between administrative drift and persistent configuration errors.

Usage examples

“My GKE pod cannot mount the Filestore instance 'finance-share' in 'us-central1-a'. It reports ETIMEDOUT.”
The agent will extract the instance details, verify the VPC firewall rules for port 2049, and check if the GKE node subnet is correctly allowlisted.
“Why am I getting EACCES when mounting my Filestore instance from a new VM?”
The agent will inspect the instance's nfsExportOptions to determine if the client VM's IP or subnet is missing from the allowed ranges.

Install

  1. Download the skill as a ZIP:

    https://autogineer.com/agent-skills/google/google-cloud-filestore-log-troubleshooting/download
  2. Unzip it into the cross-client skills folder of your project:

    mkdir -p .agents/skills && unzip google-cloud-filestore-log-troubleshooting.zip -d .agents/skills

Documentation by Google

<!-- disableFinding(LINE_OVER_80) -->

Filestore Log-Based Troubleshooting

Diagnoses, troubleshoots, and remediates Filestore client mount failures, permission errors (EACCES), and network timeouts (ETIMEDOUT) across projects.

Prerequisites & Quick Start

Required IAM roles on target project(s) (and Shared VPC host project if applicable):

  • Read: roles/file.viewer (instance & export ACLs), roles/compute.networkViewer (VPC firewall rules), roles/logging.viewer (Cloud Audit & GKE CSI logs), roles/mcp.toolUser (if using MCP tools).

  • Write (Remediation only): roles/file.editor (export ACL updates), roles/compute.securityAdmin (firewall rule creation).

Authenticate, verify billing/APIs, and configure your environment:

gcloud auth login && gcloud auth application-default login
gcloud billing projects describe {project_id} --format="value(billingEnabled)"
gcloud services enable file.googleapis.com compute.googleapis.com logging.googleapis.com --quiet
gcloud config set project {project_id} && gcloud config set compute/region {region}

Attribution

Prefix every gcloud command provided or executed with the skill metrics environment:

CLOUDSDK_METRICS_ENVIRONMENT="gcs-skills gcs-skills/1.0 (skill:google-cloud-filestore-log-troubleshooting)" \
gcloud filestore instances describe ...

On direct REST API calls, append HTTP header: User-Agent: gcs-skills/1.0 (skill:google-cloud-filestore-log-troubleshooting).

Conceptual & Informational Queries (CRITICAL)

For purely conceptual, architectural, or educational questions (e.g., "What causes EACCES on Filestore?", "Why does GKE Node IP appear instead of Pod IP?", "What ports does Filestore require?", "Explain root squash"):

  • Rule: Answer immediately using pre-trained knowledge and the workflow rules below. Answering directly minimizes tool latency and token usage when the user only seeks architectural guidance.

  • Constraint: Do not execute external tool calls or API requests for basic knowledge questions.

Handling "No-Command" Constraints (CRITICAL)

If the user prompt contains constraints like "Do not execute commands", "without executing", or "read-only":

  • Rule: Strictly avoid calling run_command to execute any shell, Python, or gcloud commands.

  • Discovery:

    1. First, check if Filestore MCP tools (get_instance, list_instances) are available and use them (API calls, not command executions).

    2. If MCP tools are unavailable, read references/mock-fleet-data.md only if the requested instance matches one of the evaluation scenarios (finance-share, shared-nfs, ml-data, data-hub, prod-share). Never report mock data as live production state. If the instance is not listed there, state that live access is required and provide the exact commands for the user to run.

    3. Fast-Path Stop Rule: Once you locate the target instance in references/mock-fleet-data.md, stop reading additional files immediately and formulate your response. Do NOT read scripts/quick_diagnose.py, scripts/diagnose_lib.py, _internal/quick_diagnose_test.py, or EVAL.* files when command execution is disabled, as inspecting code/test files wastes turns and triggers timeouts.

    4. Explain the required diagnostic steps and output the exact attributed commands for manual execution.

  • Mandatory User Confirmation Requirement: Even when command execution is disabled or the user asks only for recommendations, your response MUST STILL end with a clear question prompting the user for explicit confirmation before applying any remediation (e.g., "Would you like me to proceed with creating the VPC ingress firewall rule [rule_name]? Please confirm to proceed.").

Multi-Runtime Execution Options

# Single instance diagnosis
python3 scripts/quick_diagnose.py --instance="<INSTANCE_ID>" --location="<LOCATION_OR_ZONE>" \
    [--project="<PROJECT_ID>"] [--client-ip="<CLIENT_IP>"] [--client-subnet="<CLIENT_SUBNET_CIDR>"]

# Bulk project-wide fleet diagnosis
python3 scripts/quick_diagnose.py --all --project="<PROJECT_ID>" [--json]
FlagPurpose
--instance, --locationFilestore instance ID and region/zone (--zone is a legacy alias). Required unless --all.
--projectGCP project ID (defaults to active gcloud project).
--client-ip / --client-subnetClient IP or CIDR to evaluate against export ACLs and ingress firewall rules.
--jsonEmit machine-readable JSON on stdout (narrative report goes to stderr).
--apply-fixExecute generated remediation commands. Only pass after explicit user confirmation.
Option 2: Filestore MCP Tools / REST API / gcloud CLI
  • MCP Tools: Call get_instance(name='projects/{project_id}/locations/{location}/instances/{instance_id}') and inspect fileShares[0].nfsExportOptions and networks[0].network.

  • Native REST API (call_gcp_api): Invoke service="file", version="v1", resource_path="projects/{project_id}/locations/{location}/instances/{instance_id}".

  • Standard gcloud:

    CLOUDSDK_METRICS_ENVIRONMENT="gcs-skills gcs-skills/1.0 (skill:google-cloud-filestore-log-troubleshooting)" \
    gcloud filestore instances describe {instance_id} --location={location} --project={project_id} --format=json

Core Operational Workflow

Step 1: Parameter Extraction & GKE Node Architecture
  • Extract instance, location (region/zone), project, and client_ip / client_subnet. If target parameters are missing, list instances or ask the user to confirm.

  • GKE Architecture Rule: PersistentVolumes are mounted by the Linux kernel on the GKE Worker Node, not inside the Pod network namespace. Even if Pod IPs (10.4.0.0/14) are allowlisted, the NFS server sees traffic originating from the GKE Node Internal IP. Always evaluate and allowlist the GKE Node Subnet CIDR in nfsExportOptions and VPC firewall rules.

Step 2: Instance Metadata & Shared VPC Resolution
  1. Verify instance state is READY (report state blocker if CREATING, DELETING, or ERROR).

  2. Extract primary Filestore IP (networks[0].ipAddresses[0]) and VPC network URI.

  3. If networks[0].network references projects/{host_project}/global/networks/{network}, resolve {host_project} as the Shared VPC host project for firewall queries.

Step 3: Export ACL Evaluation (EACCES vs EROFS)
  1. Inspect fileShares[0].nfsExportOptions (if empty, default 0.0.0.0/0 READ_WRITE NO_ROOT_SQUASH applies).

  2. EACCES (Permission Denied by Server): Triggered when the client IP or subnet CIDR is not covered by any ipRanges entry.

    • Remediation: Non-destructively append the client IP/subnet CIDR to nfsExportOptions, preserving all existing export rules to avoid breaking active mounts.

  3. EROFS (Read-only file system): Triggered when accessMode is READ_ONLY but client writes are attempted.

Step 4: VPC Ingress Firewall Inspection (ETIMEDOUT)
  1. Query ingress firewall rules in the VPC network (in the host project if Shared VPC).

  2. ETIMEDOUT (Connection Timed Out): Triggered when priority-sorted ingress rules block or fail to allow TCP port 2049 (NFS) and TCP/UDP port 111 (rpcbind) from the client CIDR.

    • Remediation: Create an ingress firewall rule (ALLOW tcp:2049,udp:2049,tcp:111,udp:111) from the client subnet CIDR.

Step 5: Cloud Audit Logs & Configuration Drift Scanning

Query Cloud Audit Admin Activity logs (file.googleapis.com) over the past 24 hours to check if an UpdateInstance operation modified export ACLs or networks:

CLOUDSDK_METRICS_ENVIRONMENT="gcs-skills gcs-skills/1.0 (skill:google-cloud-filestore-log-troubleshooting)" \
gcloud logging read 'logName="projects/{project_id}/logs/cloudaudit.googleapis.com%2Factivity" AND protoPayload.serviceName="file.googleapis.com" AND protoPayload.resourceName=~".*{instance}.*"' \
    --project="{project_id}" --freshness="1d" --limit=5 --format="json"
  • Scope to Admin Activity: Always include cloudaudit.googleapis.com%2Factivity in logName so read-only GetInstance/ListInstances calls (data_access) are not falsely flagged as administrative drift.

  • Drift is Informational: Recent UpdateInstance events explain when and by whom (principalEmail, timestamp) configuration changed, but only a failed export ACL or firewall check constitutes a mount blocker.

  • Single Bulk Query Rule: When scanning multiple instances (--all), issue a single project-wide audit log query rather than per-instance queries in a loop.

  • GKE CSI Driver Logs: Optionally inspect resource.labels.container_name="gcp-filestore-driver" (severity>=ERROR) for client-side mount errors.


Output Format & Mandatory Confirmation Gate

Every diagnostic report MUST include a structured summary table and root cause analysis:

### Filestore Diagnostic Report: `[instance-name]`

| Parameter | Value |
| :--- | :--- |
| **Instance ID** | `[instance-name]` (`[location]`, Tier: `[tier]`, State: `READY`) |
| **Filestore IP & Network** | `[filestore-ip]` on VPC `[network-name]` (Host Project: `[host-project]`) |
| **Port 2049 & Export ACL** | Port 2049: `OPEN / BLOCKED` \| Export ACL: `PASS / REJECTED` |
| **Diagnostic Verdict** | **HEALTHY** or **BLOCKED: [Root Cause]** |

#### Root Cause Analysis & Recommended Remediation
- [Explanation of ETIMEDOUT (missing firewall rule on port 2049) vs EACCES (missing export ACL rule) and any recent UpdateInstance audit drift]

```bash
CLOUDSDK_METRICS_ENVIRONMENT="gcs-skills gcs-skills/1.0 (skill:google-cloud-filestore-log-troubleshooting)" \
gcloud compute firewall-rules create ...
```
Interactive Remediation Confirmation Gate (MANDATORY)
  • NEVER execute write or remediation commands without explicit user confirmation.

  • Always conclude your response with an explicit confirmation question:

    "Would you like me to proceed with executing this remediation command for you? Please confirm to proceed."

References & Bundled Scripts

Files

LICENSE


                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/

   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

   1. Definitions.

      "License" shall mean the terms and conditions for use, reproduction,
      and distribution as defined by Sections 1 through 9 of this document.

      "Licensor" shall mean the copyright owner or entity authorized by
      the copyright owner that is granting the License.

      "Legal Entity" shall mean the union of the acting entity and all
      other entities that control, are controlled by, or are under common
      control with that entity. For the purposes of this definition,
      "control" means (i) the power, direct or indirect, to cause the
      direction or management of such entity, whether by contract or
      otherwise, or (ii) ownership of fifty percent (50%) or more of the
      outstanding shares, or (iii) beneficial ownership of such entity.

      "You" (or "Your") shall mean an individual or Legal Entity
      exercising permissions granted by this License.

      "Source" form shall mean the preferred form for making modifications,
      including but not limited to software source code, documentation
      source, and configuration files.

      "Object" form shall mean any form resulting from mechanical
      transformation or translation of a Source form, including but
      not limited to compiled object code, generated documentation,
      and conversions to other media types.

      "Work" shall mean the work of authorship, whether in Source or
      Object form, made available under the License, as indicated by a
      copyright notice that is included in or attached to the work
      (an example is provided in the Appendix below).

      "Derivative Works" shall mean any work, whether in Source or Object
      form, that is based on (or derived from) the Work and for which the
      editorial revisions, annotations, elaborations, or other modifications
      represent, as a whole, an original work of authorship. For the purposes
      of this License, Derivative Works shall not include works that remain
      separable from, or merely link (or bind by name) to the interfaces of,
      the Work and Derivative Works thereof.

      "Contribution" shall mean any work of authorship, including
      the original version of the Work and any modifications or additions
      to that Work or Derivative Works thereof, that is intentionally
      submitted to Licensor for inclusion in the Work by the copyright owner
      or by an individual or Legal Entity authorized to submit on behalf of
      the copyright owner. For the purposes of this definition, "submitted"
      means any form of electronic, verbal, or written communication sent
      to the Licensor or its representatives, including but not limited to
      communication on electronic mailing lists, source code control systems,
      and issue tracking systems that are managed by, or on behalf of, the
      Licensor for the purpose of discussing and improving the Work, but
      excluding communication that is conspicuously marked or otherwise
      designated in writing by the copyright owner as "Not a Contribution."

      "Contributor" shall mean Licensor and any individual or Legal Entity
      on behalf of whom a Contribution has been received by Licensor and
      subsequently incorporated within the Work.

   2. Grant of Copyright License. Subject to the terms and conditions of
      this License, each Contributor hereby grants to You a perpetual,
      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
      copyright license to reproduce, prepare Derivative Works of,
      publicly display, publicly perform, sublicense, and distribute the
      Work and such Derivative Works in Source or Object form.

   3. Grant of Patent License. Subject to the terms and conditions of
      this License, each Contributor hereby grants to You a perpetual,
      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
      (except as stated in this section) patent license to make, have made,
      use, offer to sell, sell, import, and otherwise transfer the Work,
      where such license applies only to those patent claims licensable
      by such Contributor that are necessarily infringed by their
      Contribution(s) alone or by combination of their Contribution(s)
      with the Work to which such Contribution(s) was submitted. If You
      institute patent litigation against any entity (including a
      cross-claim or counterclaim in a lawsuit) alleging that the Work
      or a Contribution incorporated within the Work constitutes direct
      or contributory patent infringement, then any patent licenses
      granted to You under this License for that Work shall terminate
      as of the date such litigation is filed.

   4. Redistribution. You may reproduce and distribute copies of the
      Work or Derivative Works thereof in any medium, with or without
      modifications, and in Source or Object form, provided that You
      meet the following conditions:

      (a) You must give any other recipients of the Work or
          Derivative Works a copy of this License; and

      (b) You must cause any modified files to carry prominent notices
          stating that You changed the files; and

      (c) You must retain, in the Source form of any Derivative Works
          that You distribute, all copyright, patent, trademark, and
          attribution notices from the Source form of the Work,
          excluding those notices that do not pertain to any part of
          the Derivative Works; and

      (d) If the Work includes a "NOTICE" text file as part of its
          distribution, then any Derivative Works that You distribute must
          include a readable copy of the attribution notices contained
          within such NOTICE file, excluding those notices that do not
          pertain to any part of the Derivative Works, in at least one
          of the following places: within a NOTICE text file distributed
          as part of the Derivative Works; within the Source form or
          documentation, if provided along with the Derivative Works; or,
          within a display generated by the Derivative Works, if and
          wherever such third-party notices normally appear. The contents
          of the NOTICE file are for informational purposes only and
          do not modify the License. You may add Your own attribution
          notices within Derivative Works that You distribute, alongside
          or as an addendum to the NOTICE text from the Work, provided
          that such additional attribution notices cannot be construed
          as modifying the License.

      You may add Your own copyright statement to Your modifications and
      may provide additional or different license terms and conditions
      for use, reproduction, or distribution of Your modifications, or
      for any such Derivative Works as a whole, provided Your use,
      reproduction, and distribution of the Work otherwise complies with
      the conditions stated in this License.

   5. Submission of Contributions. Unless You explicitly state otherwise,
      any Contribution intentionally submitted for inclusion in the Work
      by You to the Licensor shall be under the terms and conditions of
      this License, without any additional terms or conditions.
      Notwithstanding the above, nothing herein shall supersede or modify
      the terms of any separate license agreement you may have executed
      with Licensor regarding such Contributions.

   6. Trademarks. This License does not grant permission to use the trade
      names, trademarks, service marks, or product names of the Licensor,
      except as required for reasonable and customary use in describing the
      origin of the Work and reproducing the content of the NOTICE file.

   7. Disclaimer of Warranty. Unless required by applicable law or
      agreed to in writing, Licensor provides the Work (and each
      Contributor provides its Contributions) on an "AS IS" BASIS,
      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
      implied, including, without limitation, any warranties or conditions
      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
      PARTICULAR PURPOSE. You are solely responsible for determining the
      appropriateness of using or redistributing the Work and assume any
      risks associated with Your exercise of permissions under this License.

   8. Limitation of Liability. In no event and under no legal theory,
      whether in tort (including negligence), contract, or otherwise,
      unless required by applicable law (such as deliberate and grossly
      negligent acts) or agreed to in writing, shall any Contributor be
      liable to You for damages, including any direct, indirect, special,
      incidental, or consequential damages of any character arising as a
      result of this License or out of the use or inability to use the
      Work (including but not limited to damages for loss of goodwill,
      work stoppage, computer failure or malfunction, or any and all
      other commercial damages or losses), even if such Contributor
      has been advised of the possibility of such damages.

   9. Accepting Warranty or Additional Liability. While redistributing
      the Work or Derivative Works thereof, You may choose to offer,
      and charge a fee for, acceptance of support, warranty, indemnity,
      or other liability obligations and/or rights consistent with this
      License. However, in accepting such obligations, You may act only
      on Your own behalf and on Your sole responsibility, not on behalf
      of any other Contributor, and only if You agree to indemnify,
      defend, and hold each Contributor harmless for any liability
      incurred by, or claims asserted against, such Contributor by reason
      of your accepting any such warranty or additional liability.

   END OF TERMS AND CONDITIONS

   APPENDIX: How to apply the Apache License to your work.

      To apply the Apache License to your work, attach the following
      boilerplate notice, with the fields enclosed by brackets "[]"
      replaced with your own identifying information. (Don't include
      the brackets!)  The text should be enclosed in the appropriate
      comment syntax for the file format. We also recommend that a
      file or class name and description of purpose be included on the
      same "printed page" as the copyright notice for easier
      identification within third-party archives.

   Copyright [yyyy] [name of copyright owner]

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

Requirements and compatibility

Works with: Claude Code, Claude apps, OpenAI Codex, GitHub Copilot, Cursor, Gemini CLI, Kiro, OpenCode, Goose, Amp, Roo Code, JetBrains Junie, Factory Droid, Devin (ex-Windsurf), Mistral Vibe, OpenHands, Letta

“Works with” means the tool reads the open Agent Skills format; a skill written for one tool may use features others lack.

Needs: Needs a command-line tool, Needs Python

Security

What our scanner noticed· Low risk

  • Scripts that your agent may run

This skill includes scripts that your agent may run. Read them before you use it.

A static scan is not a guarantee. Skills are third-party content: review a skill before you let an agent use it.

Attribution and licence

Published by
Google
Publisher
Google (Official)
Source
google/skills · skills/cloud/google-cloud-filestore-log-troubleshooting · commit 2194d3b
Licence
Apache License 2.0 (redistribution allowed)
  • LICENSE (added by AutoGineer from LICENSE)
  • ATTRIBUTION.md (written by AutoGineer)
Synced

AutoGineer is not affiliated with or endorsed by Google or Google.

Download ZIP

The ZIP holds the skill’s files, its licence files and an ATTRIBUTION.md. Download google-cloud-filestore-log-troubleshooting.zip