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cockpit: fix bridge EMFILE — batch status reads into one spawn, raise fd limit

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The Python cockpit-bridge frees spawn-pipe fds only at GC time; the Van
Router page's ~12 cockpit.spawn calls every 5s saw-toothed the bridge to
its 1024-fd soft limit, so the polkit admin-escalation spawn failed with
"Too many files open" whenever it landed near a peak.

Two-sided fix:
- vanrouter.js gathers all read-only status in ONE `sh -c` spawn per
  refresh, sections delimited by @@vr:<name>@@ marker lines (~12x less
  pipe churn). Mutating actions unchanged.
- cockpit-session@.service drop-in raises LimitNOFILE to 65535
  (hard limit is 524288), installed by deploy.sh.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Andreas Wrede
2026-07-06 18:32:24 -04:00
co-authored by Claude Fable 5
parent 7066207333
commit 7a92548114
3 changed files with 78 additions and 69 deletions
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deploy.sh
+2
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@@ -40,6 +40,8 @@ install -D -m0644 failover/99-van-arp.conf /etc/sysctl.d/99-van-arp.conf
echo "== cockpit plugin =="
install -d /usr/share/cockpit/vanrouter
install -m0644 cockpit/vanrouter/* /usr/share/cockpit/vanrouter/
# Bridge fd headroom (Python bridge frees spawn pipes only at GC; 1024 is too tight)
install -D -m0644 cockpit/cockpit-session-nofile.conf /etc/systemd/system/cockpit-session@.service.d/nofile.conf
echo "== thermal monitor =="
install -D -m0755 power/van-thermal /usr/local/sbin/van-thermal