troubleshoot-sandbox

DevOps & Security

Troubleshoot OpenSandbox issues by running diagnostics (logs, inspect, events, summary) via CLI or HTTP API to diagnose sandbox failures like OOM, crash, image pull errors, network problems, etc.

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Source SKILL.md: https://github.com/opensandbox-group/OpenSandbox/blob/HEAD/skills/troubleshoot-sandbox/SKILL.md

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OpenSandbox Troubleshooting

Troubleshoot sandbox $ARGUMENTS using the opensandbox diagnostics.

There are two ways to interact with the diagnostics API: CLI (if opensandbox CLI is installed) or HTTP (curl against the server directly). Use whichever is available. The HTTP approach works regardless of how the sandbox was created (SDK, API, CLI).

Workflow

Step 1: Confirm sandbox state

CLI:

opensandbox sandbox get <sandbox-id>

HTTP:

curl http://<server-domain>/v1/sandboxes/<sandbox-id>

If the server requires authentication, add -H "OPEN-SANDBOX-API-KEY: <your-key>" to all curl commands.

Check the sandbox status (Running, Pending, Paused, Failed, etc.). If the sandbox is not found, it may have been deleted or expired.

Step 2: Get diagnostics summary (recommended first action)

CLI:

opensandbox devops summary <sandbox-id>

HTTP:

curl http://<server-domain>/v1/sandboxes/<sandbox-id>/diagnostics/summary

This returns a combined plain-text view of:

Inspect: container/pod details (status, resources, network, labels)
Events: state transitions, OOM kills, errors
Logs: recent container output

Read the output carefully and look for common failure patterns listed below.

Step 3: Drill down if needed

If the summary is not enough, use individual endpoints for more detail:

CLI:

opensandbox devops logs <sandbox-id> --tail 500
opensandbox devops logs <sandbox-id> --since 30m
opensandbox devops inspect <sandbox-id>
opensandbox devops events <sandbox-id> --limit 100

HTTP:

# Get more log lines
curl "http://<server-domain>/v1/sandboxes/<sandbox-id>/diagnostics/logs?tail=500"

# Get logs from recent time window
curl "http://<server-domain>/v1/sandboxes/<sandbox-id>/diagnostics/logs?since=30m"

# Detailed container/pod inspection
curl "http://<server-domain>/v1/sandboxes/<sandbox-id>/diagnostics/inspect"

# More events
curl "http://<server-domain>/v1/sandboxes/<sandbox-id>/diagnostics/events?limit=100"

Step 4: Diagnose common problems

Symptom	What to check	Likely cause
Status=Pending, no IP	inspect - look for Waiting containers	Image pull failure, insufficient resources, node scheduling
OOMKilled=true	inspect - check memory limits	Container exceeded memory limit, increase memory resource
Exit Code 137	events + logs	OOM kill or external SIGKILL
Exit Code 1	logs - check application output	Application error, check entrypoint and env vars
Exit Code 126/127	logs	Entrypoint command not found or not executable
Connection refused to sandbox	inspect - check ports and network	Service not started inside sandbox, wrong port, network policy blocking
Sandbox stuck in Running but unresponsive	logs (tail=200)	Application hung, check for deadlocks or resource exhaustion
execd health check failing	logs - look for execd errors	execd daemon crashed or port conflict
ImagePullBackOff (K8s)	events	Wrong image name, missing registry credentials
CrashLoopBackOff (K8s)	events + logs	Application keeps crashing, check exit code and logs

Step 5: Suggest resolution

Based on the diagnosis, suggest one of:

Image issue: Verify image name, check registry access
OOM: Increase memory limit in sandbox creation (e.g. memory=4Gi)
Application error: Fix the entrypoint or application code
Network: Check network policy, verify port configuration
Scheduling (K8s): Check node resources, check pool availability
execd: Update execd image version, check port conflicts

API Reference

All diagnostics endpoints return text/plain and are available at:

Endpoint	Query Params	Description
`GET /v1/sandboxes/{id}/diagnostics/summary`	`tail` (default 50), `event_limit` (default 20)	Combined inspect + events + logs
`GET /v1/sandboxes/{id}/diagnostics/logs`	`tail` (default 100), `since` (e.g. 10m, 1h)	Container/pod logs
`GET /v1/sandboxes/{id}/diagnostics/inspect`	-	Container/pod detailed state
`GET /v1/sandboxes/{id}/diagnostics/events`	`limit` (default 50)	Container/pod events