lp:~hloeung/ubuntu-repository-cache/drop-max-spare-threads

Created by Haw Loeung and last modified
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Owner:
Haw Loeung
Project:
Ubuntu Repository Cache Charm
Status:
Development

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333. By Haw Loeung

Drop MaxSpareThreads - LP:1918211

We can't have too many around to allow for a server process to cycle
out. Otherwise we're back at the issue with scoreboard is full, not at
MaxRequestWorkers.

332. By Haw Loeung

Allow an additional process to reduce short outages on graceful restart - LP:1918211

Reviewed-on: https://code.launchpad.net/~hloeung/ubuntu-repository-cache/extra-server-process/+merge/399536
Reviewed-by: Paul Collins <email address hidden>

331. By Haw Loeung

Ensure daily apache2 graceful restart is splayed - LP:1918211

We ship out a random sleep script to cron.daily to ensure that
graceful restarts from logrotation is spread out across the various
units.

Reviewed-on: https://code.launchpad.net/~hloeung/ubuntu-repository-cache/splay-cron-daily/+merge/399553
Reviewed-by: Colin Misare <email address hidden>

330. By Haw Loeung

Add 'Accept-Encoding' in nrpe and health checks

Upstream archives use mod_deflate which sets 'Vary: Accept-Encoding' on responses, so check_http should set that header.

This also reduces the logging spam from squid:

| 2021/03/10 00:15:00 kid1| varyEvaluateMatch: Oops. Not a Vary match on second attempt, 'http://archive.ubuntu.com/ubuntu/pool/' 'accept-encoding="*"'
| 2021/03/10 00:15:00 kid1| clientProcessHit: Vary object loop!

We also hope to reduce squid memory usage (mem_node) as discovered by
tcuthbert.

Reviewed-on: https://code.launchpad.net/~hloeung/ubuntu-repository-cache/add-accept-encoding-headers/+merge/399399
Reviewed-by: Thomas Cuthbert <email address hidden>

329. By Haw Loeung

Fix issue with units stuck in maintenance - LP:1918199

Reviewed-on: https://code.launchpad.net/~hloeung/ubuntu-repository-cache/units-stuck-in-maintenance/+merge/399324
Reviewed-by: Barry Price <email address hidden>

328. By Haw Loeung

Don't cycle out apache2 processes by default - LP:1918211

This reduces the frequent and brief outages.

Reviewed-on: https://code.launchpad.net/~hloeung/ubuntu-repository-cache/no-apache2-mpm-MaxConnectionsPerChild/+merge/399336
Reviewed-by: Barry Price <email address hidden>

327. By Haw Loeung

Make health-check script/endpoint more resilient

u-r-c units are usually deployed in public clouds with the sync-host
set to the main Ubuntu archive servers. We can't control the network
connectivity/conditions so update health-check script to retry up to 3
times on failures.

Reviewed-on: https://code.launchpad.net/~hloeung/ubuntu-repository-cache/health-check-retries-on-failure/+merge/399257
Reviewed-by: Benjamin Allot <email address hidden>
Reviewed-by: Barry Price <email address hidden>

326. By Haw Loeung

Don't set health-check-disabled flag in apache.create_metadata_site()

On non-leader units, metadata sync calls service.pause() which then
calls this. This causes a brief period where the unit is disabled and
not serving requests. It's useful for initial unit provisioning but
not so on a fully functional unit where metadata points to an existing
copy on disk.

NOTE: The setting of health-check-disabled flag was introduced in r309 (MP:398100).

Reviewed-on: https://code.launchpad.net/~hloeung/ubuntu-repository-cache/dont-disable-unit-on-failover-or-pause/+merge/399254
Reviewed-by: Paul Collins <email address hidden>

325. By Haw Loeung

[trivial] Minor tidy up

324. By Haw Loeung

Log overrall check result and URLs for errors

Reviewed-on: https://code.launchpad.net/~hloeung/ubuntu-repository-cache/health-check-logging-improvements/+merge/399130
Reviewed-by: Colin Misare <email address hidden>

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