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fetch_ml/docs/_site/operations/index.html
Jeremie Fraeys ea15af1833 Fix multi-user authentication and clean up debug code 
- Fix YAML tags in auth config struct (json -> yaml)
- Update CLI configs to use pre-hashed API keys
- Remove double hashing in WebSocket client
- Fix port mapping (9102 -> 9103) in CLI commands
- Update permission keys to use jobs:read, jobs:create, etc.
- Clean up all debug logging from CLI and server
- All user roles now authenticate correctly:
  * Admin: Can queue jobs and see all jobs
  * Researcher: Can queue jobs and see own jobs
  * Analyst: Can see status (read-only access)

Multi-user authentication is now fully functional.
2025-12-06 12:35:32 -05:00

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Weekly Operations
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<h1 id="operations-runbook">Operations Runbook<a class="headerlink" href="#operations-runbook" title="Permanent link">&para;</a></h1>
<p>Operational guide for troubleshooting and maintaining the ML experiment system.</p>
<h2 id="task-queue-operations">Task Queue Operations<a class="headerlink" href="#task-queue-operations" title="Permanent link">&para;</a></h2>
<h3 id="monitoring-queue-health">Monitoring Queue Health<a class="headerlink" href="#monitoring-queue-health" title="Permanent link">&para;</a></h3>
<div class="highlight"><pre><span></span><code># Check queue depth
ZCARD task:queue
# List pending tasks
ZRANGE task:queue 0 -1 WITHSCORES
# Check dead letter queue
KEYS task:dlq:*
</code></pre></div>
<h3 id="handling-stuck-tasks">Handling Stuck Tasks<a class="headerlink" href="#handling-stuck-tasks" title="Permanent link">&para;</a></h3>
<p><strong>Symptom:</strong> Tasks stuck in "running" status</p>
<p><strong>Diagnosis:</strong>
<div class="highlight"><pre><span></span><code><span class="c1"># Check for expired leases</span>
redis-cli<span class="w"> </span>GET<span class="w"> </span>task:<span class="o">{</span>task-id<span class="o">}</span>
<span class="c1"># Look for LeaseExpiry in past</span>
</code></pre></div></p>
<p>**Rem</p>
<p>ediation:**
Tasks with expired leases are automatically reclaimed every 1 minute. To force immediate reclamation:
<div class="highlight"><pre><span></span><code><span class="c1"># Restart worker to trigger reclaim cycle</span>
systemctl<span class="w"> </span>restart<span class="w"> </span>ml-worker
</code></pre></div></p>
<h3 id="dead-letter-queue-management">Dead Letter Queue Management<a class="headerlink" href="#dead-letter-queue-management" title="Permanent link">&para;</a></h3>
<p><strong>View failed tasks:</strong>
<div class="highlight"><pre><span></span><code>KEYS task:dlq:*
</code></pre></div></p>
<p><strong>Inspect failed task:</strong>
<div class="highlight"><pre><span></span><code>GET task:dlq:{task-id}
</code></pre></div></p>
<p><strong>Retry from DLQ:</strong>
<div class="highlight"><pre><span></span><code><span class="c1"># Manual retry (requires custom script)</span>
<span class="c1"># 1. Get task from DLQ</span>
<span class="c1"># 2. Reset retry count</span>
<span class="c1"># 3. Re-queue task</span>
</code></pre></div></p>
<h3 id="worker-crashes">Worker Crashes<a class="headerlink" href="#worker-crashes" title="Permanent link">&para;</a></h3>
<p><strong>Symptom:</strong> Worker disappeared mid-task</p>
<p><strong>What Happens:</strong>
1. Lease expires after 30 minutes (default)
2. Background reclaim job detects expired lease
3. Task is retried (up to 3 attempts)
4. After max retries → Dead Letter Queue</p>
<p><strong>Prevention:</strong>
- Monitor worker heartbeats
- Set up alerts for worker down
- Use process manager (systemd, supervisor)</p>
<h2 id="worker-operations">Worker Operations<a class="headerlink" href="#worker-operations" title="Permanent link">&para;</a></h2>
<h3 id="graceful-shutdown">Graceful Shutdown<a class="headerlink" href="#graceful-shutdown" title="Permanent link">&para;</a></h3>
<div class="highlight"><pre><span></span><code><span class="c1"># Send SIGTERM for graceful shutdown</span>
<span class="nb">kill</span><span class="w"> </span>-TERM<span class="w"> </span><span class="k">$(</span>pgrep<span class="w"> </span>ml-worker<span class="k">)</span>
<span class="c1"># Worker will:</span>
<span class="c1"># 1. Stop accepting new tasks</span>
<span class="c1"># 2. Finish active tasks (up to 5min timeout)</span>
<span class="c1"># 3. Release all leases</span>
<span class="c1"># 4. Exit cleanly</span>
</code></pre></div>
<h3 id="force-shutdown">Force Shutdown<a class="headerlink" href="#force-shutdown" title="Permanent link">&para;</a></h3>
<div class="highlight"><pre><span></span><code><span class="c1"># Force kill (leases will be reclaimed automatically)</span>
<span class="nb">kill</span><span class="w"> </span>-9<span class="w"> </span><span class="k">$(</span>pgrep<span class="w"> </span>ml-worker<span class="k">)</span>
</code></pre></div>
<h3 id="worker-heartbeat-monitoring">Worker Heartbeat Monitoring<a class="headerlink" href="#worker-heartbeat-monitoring" title="Permanent link">&para;</a></h3>
<div class="highlight"><pre><span></span><code># Check worker heartbeats
HGETALL worker:heartbeat
# Example output:
# worker-abc123 1701234567
# worker-def456 1701234580
</code></pre></div>
<p><strong>Alert if:</strong> Heartbeat timestamp &gt; 5 minutes old</p>
<h2 id="redis-operations">Redis Operations<a class="headerlink" href="#redis-operations" title="Permanent link">&para;</a></h2>
<h3 id="backup">Backup<a class="headerlink" href="#backup" title="Permanent link">&para;</a></h3>
<div class="highlight"><pre><span></span><code><span class="c1"># Manual backup</span>
redis-cli<span class="w"> </span>SAVE
cp<span class="w"> </span>/var/lib/redis/dump.rdb<span class="w"> </span>/backup/redis-<span class="k">$(</span>date<span class="w"> </span>+%Y%m%d<span class="k">)</span>.rdb
</code></pre></div>
<h3 id="restore">Restore<a class="headerlink" href="#restore" title="Permanent link">&para;</a></h3>
<div class="highlight"><pre><span></span><code><span class="c1"># Stop Redis</span>
systemctl<span class="w"> </span>stop<span class="w"> </span>redis
<span class="c1"># Restore snapshot</span>
cp<span class="w"> </span>/backup/redis-20231201.rdb<span class="w"> </span>/var/lib/redis/dump.rdb
<span class="c1"># Start Redis</span>
systemctl<span class="w"> </span>start<span class="w"> </span>redis
</code></pre></div>
<h3 id="memory-management">Memory Management<a class="headerlink" href="#memory-management" title="Permanent link">&para;</a></h3>
<div class="highlight"><pre><span></span><code># Check memory usage
INFO memory
# Evict old data if needed
FLUSHDB # DANGER: Clears all data!
</code></pre></div>
<h2 id="common-issues">Common Issues<a class="headerlink" href="#common-issues" title="Permanent link">&para;</a></h2>
<h3 id="issue-queue-growing-unbounded">Issue: Queue Growing Unbounded<a class="headerlink" href="#issue-queue-growing-unbounded" title="Permanent link">&para;</a></h3>
<p><strong>Symptoms:</strong>
- <code>ZCARD task:queue</code> keeps increasing
- No workers processing tasks</p>
<p><strong>Diagnosis:</strong>
<div class="highlight"><pre><span></span><code><span class="c1"># Check worker status</span>
systemctl<span class="w"> </span>status<span class="w"> </span>ml-worker
<span class="c1"># Check logs</span>
journalctl<span class="w"> </span>-u<span class="w"> </span>ml-worker<span class="w"> </span>-n<span class="w"> </span><span class="m">100</span>
</code></pre></div></p>
<p><strong>Resolution:</strong>
1. Verify workers are running
2. Check Redis connectivity
3. Verify lease configuration</p>
<h3 id="issue-high-retry-rate">Issue: High Retry Rate<a class="headerlink" href="#issue-high-retry-rate" title="Permanent link">&para;</a></h3>
<p><strong>Symptoms:</strong>
- Many tasks in DLQ
- <code>retry_count</code> field high on tasks</p>
<p><strong>Diagnosis:</strong>
<div class="highlight"><pre><span></span><code><span class="c1"># Check worker logs for errors</span>
journalctl<span class="w"> </span>-u<span class="w"> </span>ml-worker<span class="w"> </span><span class="p">|</span><span class="w"> </span>grep<span class="w"> </span><span class="s2">&quot;retry&quot;</span>
<span class="c1"># Look for patterns (network issues, resource limits, etc)</span>
</code></pre></div></p>
<p><strong>Resolution:</strong>
- Fix underlying issue (network, resources, etc)
- Adjust retry limits if permanent failures
- Increase task timeout if jobs are slow</p>
<h3 id="issue-leases-expiring-prematurely">Issue: Leases Expiring Prematurely<a class="headerlink" href="#issue-leases-expiring-prematurely" title="Permanent link">&para;</a></h3>
<p><strong>Symptoms:</strong>
- Tasks retried even though worker is healthy
- Logs show "lease expired" frequently</p>
<p><strong>Diagnosis:</strong>
<div class="highlight"><pre><span></span><code><span class="c1"># Check worker config</span>
<span class="l l-Scalar l-Scalar-Plain">cat configs/worker-config.yaml | grep -A3 &quot;lease&quot;</span>
<span class="l l-Scalar l-Scalar-Plain">task_lease_duration</span><span class="p p-Indicator">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">30m</span><span class="w"> </span><span class="c1"># Too short?</span>
<span class="nt">heartbeat_interval</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1m</span><span class="w"> </span><span class="c1"># Too infrequent?</span>
</code></pre></div></p>
<p><strong>Resolution:</strong>
<div class="highlight"><pre><span></span><code><span class="c1"># Increase lease duration for long-running jobs</span>
<span class="nt">task_lease_duration</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">60m</span>
<span class="nt">heartbeat_interval</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">30s</span><span class="w"> </span><span class="c1"># More frequent heartbeats</span>
</code></pre></div></p>
<h2 id="performance-tuning">Performance Tuning<a class="headerlink" href="#performance-tuning" title="Permanent link">&para;</a></h2>
<h3 id="worker-concurrency">Worker Concurrency<a class="headerlink" href="#worker-concurrency" title="Permanent link">&para;</a></h3>
<div class="highlight"><pre><span></span><code><span class="c1"># worker-config.yaml</span>
<span class="nt">max_workers</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">4</span><span class="w"> </span><span class="c1"># Number of parallel tasks</span>
<span class="c1"># Adjust based on:</span>
<span class="c1"># - CPU cores available</span>
<span class="c1"># - Memory per task</span>
<span class="c1"># - GPU availability</span>
</code></pre></div>
<h3 id="redis-configuration">Redis Configuration<a class="headerlink" href="#redis-configuration" title="Permanent link">&para;</a></h3>
<div class="highlight"><pre><span></span><code># /etc/redis/redis.conf
# Persistence
save 900 1
save 300 10
# Memory
maxmemory 2gb
maxmemory-policy noeviction
# Performance
tcp-keepalive 300
timeout 0
</code></pre></div>
<h2 id="alerting-rules">Alerting Rules<a class="headerlink" href="#alerting-rules" title="Permanent link">&para;</a></h2>
<h3 id="critical-alerts">Critical Alerts<a class="headerlink" href="#critical-alerts" title="Permanent link">&para;</a></h3>
<ol>
<li><strong>Worker Down</strong> (no heartbeat &gt; 5min)</li>
<li><strong>Queue Depth</strong> &gt; 1000 tasks</li>
<li><strong>DLQ Growth</strong> &gt; 100 tasks/hour</li>
<li><strong>Redis Down</strong> (connection failed)</li>
</ol>
<h3 id="warning-alerts">Warning Alerts<a class="headerlink" href="#warning-alerts" title="Permanent link">&para;</a></h3>
<ol>
<li><strong>High Retry Rate</strong> &gt; 10% of tasks</li>
<li><strong>Slow Queue Drain</strong> (depth increasing over 1 hour)</li>
<li><strong>Worker Memory</strong> &gt; 80% usage</li>
</ol>
<h2 id="health-checks">Health Checks<a class="headerlink" href="#health-checks" title="Permanent link">&para;</a></h2>
<div class="highlight"><pre><span></span><code><span class="ch">#!/bin/bash</span>
<span class="c1"># health-check.sh</span>
<span class="c1"># Check Redis</span>
redis-cli<span class="w"> </span>PING<span class="w"> </span><span class="o">||</span><span class="w"> </span><span class="nb">echo</span><span class="w"> </span><span class="s2">&quot;Redis DOWN&quot;</span>
<span class="c1"># Check worker heartbeat</span>
<span class="nv">WORKER_ID</span><span class="o">=</span><span class="k">$(</span>cat<span class="w"> </span>/var/run/ml-worker.pid<span class="k">)</span>
<span class="nv">LAST_HB</span><span class="o">=</span><span class="k">$(</span>redis-cli<span class="w"> </span>HGET<span class="w"> </span>worker:heartbeat<span class="w"> </span><span class="s2">&quot;</span><span class="nv">$WORKER_ID</span><span class="s2">&quot;</span><span class="k">)</span>
<span class="nv">NOW</span><span class="o">=</span><span class="k">$(</span>date<span class="w"> </span>+%s<span class="k">)</span>
<span class="k">if</span><span class="w"> </span><span class="o">[</span><span class="w"> </span><span class="k">$((</span><span class="nv">NOW</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="nv">LAST_HB</span><span class="k">))</span><span class="w"> </span>-gt<span class="w"> </span><span class="m">300</span><span class="w"> </span><span class="o">]</span><span class="p">;</span><span class="w"> </span><span class="k">then</span>
<span class="w"> </span><span class="nb">echo</span><span class="w"> </span><span class="s2">&quot;Worker heartbeat stale&quot;</span>
<span class="k">fi</span>
<span class="c1"># Check queue depth</span>
<span class="nv">DEPTH</span><span class="o">=</span><span class="k">$(</span>redis-cli<span class="w"> </span>ZCARD<span class="w"> </span>task:queue<span class="k">)</span>
<span class="k">if</span><span class="w"> </span><span class="o">[</span><span class="w"> </span><span class="s2">&quot;</span><span class="nv">$DEPTH</span><span class="s2">&quot;</span><span class="w"> </span>-gt<span class="w"> </span><span class="m">1000</span><span class="w"> </span><span class="o">]</span><span class="p">;</span><span class="w"> </span><span class="k">then</span>
<span class="w"> </span><span class="nb">echo</span><span class="w"> </span><span class="s2">&quot;Queue depth critical: </span><span class="nv">$DEPTH</span><span class="s2">&quot;</span>
<span class="k">fi</span>
</code></pre></div>
<h2 id="runbook-checklist">Runbook Checklist<a class="headerlink" href="#runbook-checklist" title="Permanent link">&para;</a></h2>
<h3 id="daily-operations">Daily Operations<a class="headerlink" href="#daily-operations" title="Permanent link">&para;</a></h3>
<ol>
<li>Check queue depth</li>
<li>Verify worker heartbeats</li>
<li>Review DLQ for patterns</li>
<li>Check Redis memory usage</li>
</ol>
<h3 id="weekly-operations">Weekly Operations<a class="headerlink" href="#weekly-operations" title="Permanent link">&para;</a></h3>
<ol>
<li>Review retry rates</li>
<li>Analyze failed task patterns</li>
<li>Backup Redis snapshot</li>
<li>Review worker logs</li>
</ol>
<h3 id="monthly-operations">Monthly Operations<a class="headerlink" href="#monthly-operations" title="Permanent link">&para;</a></h3>
<ol>
<li>Performance tuning review</li>
<li>Capacity planning</li>
<li>Update documentation</li>
<li>Test disaster recovery</li>
</ol>
<hr />
<p><strong>For homelab setups:</strong>
Most of these operations can be simplified. Focus on:
- Basic monitoring (queue depth, worker status)
- Periodic Redis backups
- Graceful shutdowns for maintenance</p>
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