🎨 Add fallback traefik 503 routes 🚨⚠️ DEVOPS #7899
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Add fallback routes that will take effect once main services (e.g. webserver is not in `running` state). Once service is not in `running` state, its configuration is removed from traefik leading to 404. Related Issue(s): * ITISFoundation/osparc-ops-environments#218 Related PR(s): * ITISFoundation/osparc-ops-environments#950
Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## master #7899 +/- ##
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+ Coverage 87.94% 87.98% +0.03%
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Files 1845 1838 -7
Lines 71130 70940 -190
Branches 1220 1220
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- Hits 62558 62419 -139
+ Misses 8220 8168 -52
- Partials 352 353 +1
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comment see parent PR ITISFoundation/osparc-ops-environments#950 (review)
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What do these changes do?
Add fallback routes that will take effect once main services (e.g. webserver is not in
runningstate). This fallback routes will trigger 503 traefik default response which is a proper response when simcore service is not inrunningstate.By default traefik removes configuration of services that are not in running state (this leads to
404) traefik/traefik#7842Next steps
Ship relevant html / json content back to users. We need to discuss what is proper content and in which scenarios we need to serve it.
Implementation details
https://doc.traefik.io/traefik/providers/swarm/#allowemptyservices traefik configuration setting was tested but had no effect as reported in traefik/traefik#11827
We don't have traefik healthcheck for
simcore traefik. Since we need to introduce healthcheck per traefik-service and simcore traefik defines multiple of those, introducing extra 3 calls on traefik service might be an overkill. It is not clear is this healthcheck makes sense in general as it runs against traefik itself 🤷Related issue/s
Related PR(s)
invitaitonsservice as its traefik config lives inopsreposimcore traefik(this routes configureops traefik)How to test
Scale exposed simcore service (e.g.
webserverto0replicas). Open platform in browser and ensure you get503error withUnavailable servicemessage (instead of404 not found)Dev-ops