Hi Karl, If your app starts up without issues, the health checks would not matter. There are issues with your app's start up process, that you need to address. For coding-related issues, you are at an advantage posting to stackoverflow or similar forums, where you can get expert help from active programmers.
On 28 February 2018 at 16:23, Karl Tinawi <k...@onkho.com> wrote: > Hi George, > > I was able to do a test deployment tonight by defining the new health > checks as you recommended. > > Before I continue - my test for this based on performing a deployment as > we see the exact same behaviour there with the VM starting up and crashing > as we did with the incident on Monday. > > The good news is this has seemingly completely resolved our deployment > issue - in that they are once again successful in a reasonable amount of > time, rather than timing out and failing because of the aforementioned. So > at this point I'm semi confident that it has also resolved the issue we > experienced on Monday when the VM was restarted and couldn't start up > again. Difficult to prove this one currently from my side. > > I replaced the legacy health_check block in our .yaml file with the > following:- > > liveness_check: > path: "/_ah/health" > initial_delay_sec: 300 > check_interval_sec: 5 > timeout_sec: 5 > failure_threshold: 3 > success_threshold: 1 > > readiness_check: > path: "/login" > app_start_timeout_sec: 300 > check_interval_sec: 30 > timeout_sec: 5 > failure_threshold: 3 > success_threshold: 1 > > > The most obvious question I have at this point, is why? Why would this > resolve it the issue? I can only guess that this could be related to the > new style health/liveness checks being enabled by default but we had not > executed: > > gcloud beta app update --split-health-checks --project [YOUR_PROJECT_ID] > > > or provided the liveness_check/readiness_check blocks in our yaml file? > I've only just learnt about these new updated health checks here > <https://cloud.google.com/appengine/docs/flexible/php/configuring-your-app-with-app-yaml#configuring_supervisord_in_the_php_runtime> > as > it's not something we keep up-to-date with once we have a desired > configuration so am concerned that there was a backwards compatibility > issue here. > > I'm performing a couple more deployments to satisfy myself that this is > not a fluke. > > As a side question I see these entries in our logs now since activating > the new health checks: > > > <https://lh3.googleusercontent.com/-yUuumRDccTA/WpcdBRBtY7I/AAAAAAAAABI/I_2N-EwYdWIzv6RJKaLcnxRJdyVoQs7IACLcBGAs/s1600/readiness_check.png> > > > <https://lh3.googleusercontent.com/-1q52sNXnYFI/WpcdFCILrbI/AAAAAAAAABM/NZrQfaazq0cwAMCYbvujUfE1l9J6iZynwCLcBGAs/s1600/liveness_check.png> > > These don't seem to be obeying the configuration I had defined (as per > above code snippets). Most notably the path and interval? > > I'd like to learn if I'm doing anything wrong here or if there is an > explanation. > > Many thanks again and looking forward to hearing from you. > > Karl > > > > On Wednesday, February 28, 2018 at 8:12:09 PM UTC, Karl Tinawi wrote: >> >> Hi George, >> >> Yes that's correct - it's happened once outside of deployments. >> >> To answer your questions sir: >> >> - We require a custom PHP installation in order to make use of >> modules that are missing from Google's offering. I've not checked the >> latest list of extension but it may be that we may be able to move back to >> using the standard PHP image so I'll check this for sure. >> - Scaling is another challenge that we're looking and we're certainly >> aware that we need to move to auto scaling for contingency etc... >> - I'll test configuring the readiness check and report back if we >> notice any difference in behaviour. >> >> Were the logs helpful? I'd be grateful if you could shed some light on >> the investigation your end. This is the first time we've noticed an issue >> such as this during the maintenance process, which should be innocuous and >> invisible to us. >> >> At this point I'm unsure if the issues we face during deployments are >> related to the incident that happened with our running app, which continue >> to occur daily. It's worth noting that the behaviour of the VM is identical >> (in the way of the abrupt restarts as it's trying to boot). I may look at >> trying a test deployment using another image and seeing if that helps. >> >> >> Many thanks again, >> >> Karl >> >> >> On Wednesday, February 28, 2018 at 12:52:06 AM UTC, George (Cloud >> Platform Support) wrote: >>> >>> Hello Karl, >>> >>> You seem to indicate that the outage is a one-time event, and that there >>> is no other similar occurrence as yet. If this is so, to prevent similar >>> unwanted events in future, you may configure your app for health checks, in >>> detail. For reference, the "Configuring your App with app.yaml" should >>> prove of great help. In your app.yaml, you can specify either liveness >>> check (choosing appropriate parameter values): >>> >>> liveness_check: >>> path: "/liveness_check" >>> check_interval_sec: 30 >>> timeout_sec: 4 >>> failure_threshold: 2 >>> success_threshold: 2 >>> >>> or readiness check: >>> >>> readiness_check: >>> path: "/readiness_check" >>> check_interval_sec: 5 >>> timeout_sec: 4 >>> failure_threshold: 2 >>> success_threshold: 2 >>> app_start_timeout_sec: 300 >>> >>> It is worthwhile noting that the usual way of specifying PHP for you app >>> is: >>> >>> runtime: php //This setting is required. It is the name of the App >>> Engine language runtime used by this application. To specify PHP, use php >>> env: flex >>> >>> You app uses: runtime: custom , by contrast. >>> >>> You may also switch to automatic scaling from manual, and one only >>> instance. If this makes a difference in your app's behavior, the >>> information would help us with debugging. >>> >>> >>> -- > You received this message because you are subscribed to a topic in the > Google Groups "Google App Engine" group. > To unsubscribe from this topic, visit https://groups.google.com/d/ > topic/google-appengine/5mKOn6RzRFY/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > google-appengine+unsubscr...@googlegroups.com. > To post to this group, send email to google-appengine@googlegroups.com. > Visit this group at https://groups.google.com/group/google-appengine. > To view this discussion on the web visit https://groups.google.com/d/ > msgid/google-appengine/fe551f25-65ef-4eef-a1fd- > 7e53e44f0f06%40googlegroups.com > <https://groups.google.com/d/msgid/google-appengine/fe551f25-65ef-4eef-a1fd-7e53e44f0f06%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. 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