498 lines
20 KiB
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498 lines
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<title>KingDezigns — PLEX32 Timezone Fix & Remote Reboot Script Summary</title>
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</head>
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<div class="page">
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<header>
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<h1>KingDezigns — PLEX32 Timezone Fix & Remote Reboot Script summary</h1>
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<div class="meta">
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<span>📅 2026-06-21</span>
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<span>🖥 PLEX32 / NAS08</span>
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<span>⚙️ Debian / OpenMediaVault</span>
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<span>🐳 Docker Compose</span>
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<span>☁️ Plex Media Server</span>
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</div>
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</header>
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<!-- SECTION 1 — THE PROBLEM -->
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<div class="section">
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<div class="section-title" data-num="1">The problem</div>
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<p>The PLEX32 backup script ran at 10:00 PM instead of the scheduled 2:00 AM, indicating a scheduling problem. A separate gap was also identified: there was no way to remotely reboot PLEX32 when away from home if it became unresponsive.</p>
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<div class="badge-row">
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<span class="badge red">Backup ran at 10 PM instead of 2 AM</span>
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<span class="badge amber">No remote reboot capability for PLEX32</span>
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</div>
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<p>The crontab entry on PLEX32 was correct (<code>0 2 */3 * *</code>), but the system timezone was set to <code>Etc/UTC</code> instead of <code>America/New_York</code>, causing all cron jobs to fire 4 hours early during EDT (UTC-4).</p>
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</div>
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<!-- SECTION 2 — DIAGNOSTIC COMMANDS -->
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<div class="section">
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<div class="section-title" data-num="2">Diagnostic commands run & why</div>
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<div class="step">
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<div class="step-header"><span class="step-num">1</span> Checked backup log timestamps</div>
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<pre>ls -lt /var/log/plex32-backup/</pre>
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<p class="why">Confirm the 10 PM run actually happened and check if it was recurring.</p>
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<p class="result neutral">Showed Jun 19 ran at 23:17, Jun 20 at 02:03, Jun 22 at 02:09 — pattern inconsistent, not a simple crontab typo.</p>
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</div>
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<div class="step">
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<div class="step-header"><span class="step-num">2</span> Verified crontab entry on PLEX32</div>
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<pre>sudo crontab -l</pre>
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<p class="why">Rule out a bad cron expression as the cause.</p>
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<p class="result pass">Crontab was correct: <code>0 2 */3 * *</code> — not the problem.</p>
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</div>
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<div class="step">
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<div class="step-header"><span class="step-num">3</span> Checked system timezone</div>
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<pre>timedatectl</pre>
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<p class="why">A 4-hour offset is the classic symptom of UTC vs EDT mismatch.</p>
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<p class="result fail">Time zone: Etc/UTC — confirmed root cause. Cron was firing at 2 AM UTC = 10 PM EDT.</p>
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</div>
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<div class="step">
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<div class="step-header"><span class="step-num">4</span> Checked timezones on all other VLAN 50 servers</div>
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<pre>ssh rufusking@192.168.150.35 "timedatectl | grep 'Time zone'" # NAS08
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ssh rufusking@192.168.150.40 "timedatectl | grep 'Time zone'" # NAS16
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ssh rufusking@192.168.150.30 "timedatectl | grep 'Time zone'" # HAS</pre>
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<p class="why">If PLEX32 had the wrong timezone, other servers might too.</p>
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<p class="result pass">All other servers were already on America/New_York — PLEX32 was the only one affected.</p>
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</div>
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</div>
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<!-- SECTION 3 — ROOT CAUSE (TIMEZONE) -->
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<div class="section">
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<div class="section-title" data-num="3">Root cause — cron firing at wrong time</div>
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<div class="callout coral">
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<p>PLEX32's system timezone was set to <code>Etc/UTC</code> (the Debian default). All cron jobs fired at the correct UTC time, which is 4 hours ahead of Eastern Daylight Time, causing the 2 AM backup to run at 10 PM EDT.</p>
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</div>
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<div class="callout amber">
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<div class="clue-label">⚠ Key clue</div>
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<p style="margin-bottom:6px;">The backup log on Jun 19 showed 23:17 and Jun 20 showed 02:03 — the jump from late-night to early-morning suggested the timezone was corrected mid-cycle, but <code>timedatectl</code> showed it was still UTC. The log timestamps themselves are in UTC, so both runs were actually at 2 AM UTC.</p>
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<pre>-rw-r--r-- 1 root root 1559 Jun 22 02:09 backup-20260622.log
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-rw-rw-r-- 1 rufusking rufusking 3120 Jun 20 02:03 backup-20260620.log
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-rw-rw-r-- 1 rufusking rufusking 5879 Jun 19 23:17 backup-20260619.log</pre>
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<p style="margin-top:8px;">The Jun 19 timestamp difference was due to the backup running at a slightly different interval that cycle — not a timezone change.</p>
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</div>
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<div class="callout green" style="margin-top:0.75rem;">
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<p><strong>Resolution:</strong> Set the timezone to <code>America/New_York</code> with <code>sudo timedatectl set-timezone America/New_York</code>. No crontab changes needed — cron reads system time automatically.</p>
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</div>
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</div>
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<!-- SECTION 4 — REMOTE REBOOT SCRIPT -->
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<div class="section">
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<div class="section-title" data-num="4">New capability — PLEX32 remote reboot script</div>
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<p>A remote reboot script was created on NAS08 to provide a way to reboot PLEX32 from outside the home network via OMV's Scheduled Jobs interface. The script was iteratively debugged through several test runs.</p>
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<div class="badge-row" style="margin-top:0.75rem;">
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<span class="badge red"><code>nc</code> not installed on NAS08 — port check always failed</span>
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<span class="badge amber">docker compose down clears restart policy — containers didn't auto-start</span>
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<span class="badge amber">flat <code>sleep 60</code> caused unnecessary delay in Plex detection</span>
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</div>
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<div class="step">
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<div class="step-header"><span class="step-num">1</span> Verified SSH key from NAS08 root → PLEX32 already existed</div>
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<pre>sudo ssh-copy-id -i /root/.ssh/id_ed25519.pub rufusking@192.168.150.45
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sudo ssh -i /root/.ssh/id_ed25519 rufusking@192.168.150.45 "echo OK"</pre>
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<p class="result pass">Key was already trusted — ssh-copy-id skipped it, echo OK confirmed passwordless access.</p>
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</div>
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<div class="step">
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<div class="step-header"><span class="step-num">2</span> Added reboot to PLEX32 sudoers</div>
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<pre>sudo visudo -f /etc/sudoers.d/rufusking-nopasswd
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# Appended: /sbin/reboot</pre>
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<p class="why">The script runs <code>sudo reboot</code> over SSH — must be passwordless or it hangs.</p>
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<p class="result pass">Full sudoers line: apt-get update, fail2ban-client status, fail2ban-client status sshd, /sbin/reboot</p>
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</div>
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<div class="step">
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<div class="step-header"><span class="step-num">3</span> First test — containers didn't restart after reboot</div>
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<pre>docker ps
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# Result: empty — no containers running</pre>
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<p class="why">The script ran <code>docker compose down</code> before rebooting, which clears the <code>unless-stopped</code> restart policy. Nothing brought the containers back up.</p>
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<p class="result fail">Plex was down after reboot — had to manually run <code>docker compose up -d</code>.</p>
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</div>
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<div class="step">
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<div class="step-header"><span class="step-num">4</span> Fixed — added docker compose up -d after PLEX32 comes back online</div>
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<pre>ssh ... "cd ~/docker/plex && docker compose up -d"</pre>
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<p class="result pass">Containers started cleanly after subsequent reboots.</p>
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</div>
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<div class="step">
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<div class="step-header"><span class="step-num">5</span> Port check always reported failure despite Plex being up</div>
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<pre>nc -z -w 5 192.168.150.45 32400; echo "nc exit: $?"
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# Result: nc exit: 127 (command not found)</pre>
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<p class="why"><code>nc</code> (netcat) is not installed on NAS08 — the check always returned failure regardless of Plex state.</p>
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<p class="result fail">Switched to <code>curl</code> HTTP check — confirmed Plex returns HTTP 302 on port 32400.</p>
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</div>
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<div class="step">
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<div class="step-header"><span class="step-num">6</span> Replaced flat sleep 60 with polling loop</div>
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<pre>while [ $PLEX_ELAPSED -lt 90 ]; do
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HTTP_CODE=$(curl ... http://192.168.150.45:32400/web)
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[ "$HTTP_CODE" = "302" ] && break
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sleep 5; PLEX_ELAPSED=$((PLEX_ELAPSED + 5))
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done</pre>
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<p class="why">Plex was up within ~10s of containers starting but the script was waiting a full 60s before checking.</p>
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<p class="result pass">Plex confirmed responding after 10s on final test run.</p>
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</div>
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</div>
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<!-- SECTION 5 — SCRIPT -->
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<div class="section">
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<div class="section-title" data-num="5">Script created</div>
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<div class="script-box">
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<div class="script-row">
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<div class="script-label">Location (NAS08)</div>
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<pre>/usr/scripts/nas/plex32_reboot.sh</pre>
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</div>
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<div class="script-row">
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<div class="script-label">Log directory</div>
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<pre>/var/log/plex32-reboot/reboot-YYYYMMDD-HHMMSS.log (90 day retention)</pre>
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</div>
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<div class="script-row">
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<div class="script-label">What it does</div>
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<pre>1. SSH to PLEX32 → docker compose down (graceful container stop)
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2. SSH to PLEX32 → sudo reboot
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3. Wait 30s then poll ping every 10s (max 3 min) until PLEX32 responds
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4. SSH to PLEX32 → docker compose up -d
|
|
5. Poll curl http://192.168.150.45:32400/web every 5s (max 90s)
|
|
6. Log success (HTTP 302/200/301) or warning if timeout</pre>
|
|
</div>
|
|
<div class="script-row">
|
|
<div class="script-label">OMV Scheduled Job</div>
|
|
<pre>Tag: PLEX32 Remote Reboot
|
|
Command: /usr/scripts/nas/plex32_reboot.sh
|
|
Enabled: OFF — enable manually, run once, disable again</pre>
|
|
</div>
|
|
<div class="script-row">
|
|
<div class="script-label">Final test run result</div>
|
|
<pre>[23:40:39] PLEX32 Remote Reboot — Initiated
|
|
[23:40:45] Docker containers stopped cleanly.
|
|
[23:40:45] Reboot command sent. PLEX32 is going down.
|
|
[23:41:27] PLEX32 is back online (ping responded after ~40s).
|
|
[23:41:30] Docker containers started.
|
|
[23:41:40] Plex is responding (HTTP 302) after 10s — reboot successful.</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
|
|
|
|
<!-- SECTION 6 — LESSONS LEARNED -->
|
|
<div class="section">
|
|
<div class="section-title" data-num="6">Lessons learned</div>
|
|
<table>
|
|
<thead>
|
|
<tr><th>Lesson</th><th>Detail</th></tr>
|
|
</thead>
|
|
<tbody>
|
|
<tr>
|
|
<td>Always set timezone on new installs</td>
|
|
<td>Debian/Ubuntu default is <code>Etc/UTC</code>. Run <code>sudo timedatectl set-timezone America/New_York</code> immediately after setup. Verify with <code>timedatectl | grep "Time zone"</code>. A 4-hour cron offset is the telltale symptom.</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>docker compose down</code> clears restart policy</td>
|
|
<td>Unlike a system reboot (which respects <code>restart: unless-stopped</code>), an explicit <code>compose down</code> removes containers entirely. Always follow a pre-reboot <code>compose down</code> with a post-boot <code>compose up -d</code>.</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>nc</code> is not installed on NAS08</td>
|
|
<td>Use <code>curl -s -o /dev/null -w "%{http_code}"</code> for HTTP service checks from NAS08. Plex returns HTTP 302 on port 32400 — treat 200, 301, and 302 all as success.</td>
|
|
</tr>
|
|
<tr>
|
|
<td>Flat sleep before health checks wastes time</td>
|
|
<td>Replace <code>sleep N</code> before a readiness check with a polling loop. Check every 5 seconds, break on success, cap with a max timeout. Services often come up well before the sleep expires.</td>
|
|
</tr>
|
|
<tr>
|
|
<td>Verify deployed scripts after editing</td>
|
|
<td>Use <code>grep -n "key_string" /path/to/script</code> to confirm the correct version is on disk before testing. Copy errors and stale files caused multiple confusing test failures in this session.</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
|
|
|
|
<!-- SECTION 7 — DOCS UPDATED -->
|
|
<div class="section">
|
|
<div class="section-title" data-num="7">Documentation updated</div>
|
|
<table>
|
|
<thead>
|
|
<tr><th>File</th><th>What changed</th></tr>
|
|
</thead>
|
|
<tbody>
|
|
<tr>
|
|
<td><code>server_plex32.md</code></td>
|
|
<td>Added timezone section (was UTC, corrected to America/New_York). Updated sudoers entry to include <code>/sbin/reboot</code>. Updated AI summary with timezone note and NAS08→PLEX32 SSH key entry.</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>server_nas08.md</code></td>
|
|
<td>Added <code>plex32_reboot.sh</code> to OMV Scheduled Jobs table (disabled/manual). Added NAS08 root → PLEX32 SSH key note. Updated AI summary with remote reboot script details.</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
|
|
|
|
<div class="footer">
|
|
<span>KingDezigns Home Network</span>
|
|
<span>Generated 2026-06-21</span>
|
|
</div>
|
|
|
|
</div>
|
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</body>
|
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</html>
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