Hi George,

On a successful boot of the VM we see the following:

A  ------------------------------------------------------------------- 
A  The instance aef-default-30-sp8t with Debian based image was created for 
version 30 
A  Feb 28 23:07:05 aef-default-30-sp8t kernel: imklog 5.8.11, log source = 
/proc/kmsg started. 
A  Feb 28 23:07:05 aef-default-30-sp8t rsyslogd: [origin 
software="rsyslogd" swVersion="5.8.11" x-pid="2965" 
x-info="http://www.rsyslog.com";] start 
A  Feb 28 23:07:05 aef-default-30-sp8t kernel: [    0.000000] Initializing 
cgroup subsys cpuset 
A  Feb 28 23:07:05 aef-default-30-sp8t kernel: [    0.000000] Initializing 
cgroup subsys cpu 
A  Feb 28 23:07:05 aef-default-30-sp8t kernel: [    0.000000] Initializing 
cgroup subsys cpuacct
...




On Wednesday, February 28, 2018 at 10:55:44 PM UTC, Karl Tinawi wrote:
>
> Hi George,
>
> I was celebrating prematurely :( We're still facing the issue it seems. 
> I'm trying to deploy the same health check change to our production project.
>
> Please could you take a look at this log output? :
>
> I  App Engine CreateVersion default:30-1 k...@onkho.com 
> {"@type":"type.googleapis.com/google.cloud.audit.AuditLog","status":{},"authenticationInfo":{"principalEmail":"k...@onkho.com"},"requestMetadata":{"callerIp":"217.45.176.239","callerSuppliedUserAgent":"google-cloud-sdk
>  x_Tw5K8nnjoRAqULM9PFAC2b gcloud/190.0.1 command/gcloud.app.deploy 
> invocation-id/7… App Engine CreateVersion default:30-1 k...@onkho.com 
> A  The instance aef-default-30--1-m6mp with Debian based image was created 
> for version 30-1 
> A  ====== Unexpected error during VM startup ====== 
> A  ==== Dump of VM runtime system logs follows ==== 
> A  == Output of 'docker ps -a' == 
> A  CONTAINER ID        IMAGE               COMMAND             CREATED        
>      STATUS              PORTS               NAMES 
> A  ========= rebooting. ======================== 
> A  ------------------------VM shutdown initiated----------------------- 
> A  Current app health: 0 
> A  Beginning service lameduck. 
> A  Triggering app shutdown handlers. 
> A  Sending SIGUSR1 to fluentd to trigger a log flush. 
> A  
> {"textPayload":"","insertId":"5kdt4ig2zxfdhb","resource":{"type":"gae_app","labels":{"project_id":"onkho-web-app-live","version_id":"30-1","module_id":"default"}},"timestamp":"2018-02-28T22:36:35.183183909Z","labels":{"compute.googleapis.com/resource_type":"instance","compute.googleapis.com/resource…
>  
> A  ------------------------------------------------------------------- 
> A  --------------App was unhealthy, grabbing debug logs--------------- 
> A  Container CID file not found. 
> A  ------------------------------------------------------------------- 
> A  -------------------------Tail of app logs-------------------------- 
> A  App logs not found. 
> A  ------------------------------------------------------------------- 
> A  -------------------------Additional debug info-------------------------- 
> A  cat: /home/vmagent/onkho-web-app-live_30-1-407983590104907782.env: No such 
> file or directory 
> A  Instance has machine type of custom-4-8192 has 4 vCPU and 8192 Mb memory. 
> App can use  Mb memory. 
> A  VM memory consumption: 
> A               total       used       free     shared    buffers     cached 
> A  Mem:          8005        276       7728          0         14        117 
> A  -/+ buffers/cache:        144       7861 
> A  Swap:            0          0          0 
> A  VM disk usage: 
> A  Filesystem     Type     1K-blocks    Used Available Use% Mounted on 
> A  rootfs         rootfs    10188088 4544604   5102916  48% / 
> A  udev           devtmpfs     10240       0     10240   0% /dev 
> A  /dev/sda1      ext4      10188088 4544604   5102916  48% / 
> A  /dev/sda1      ext4      10188088 4544604   5102916  48% 
> /var/lib/docker/aufs 
> A  Processes running on the VM: 
> A  top - 22:36:35 up 0 min,  0 users,  load average: 0.48, 0.13, 0.04 
> A  Tasks:  95 total,   1 running,  94 sleeping,   0 stopped,   0 zombie 
> A  %Cpu(s):  2.1 us,  3.1 sy,  0.0 ni, 85.6 id,  9.1 wa,  0.0 hi,  0.0 si,  
> 0.0 st 
> A  KiB Mem:   8197596 total,   287356 used,  7910240 free,    15352 buffers 
> A  KiB Swap:        0 total,        0 used,        0 free,   120448 cached 
> A  
> {"textPayload":"","insertId":"5kdt4ig2zxfdi3","resource":{"type":"gae_app","labels":{"module_id":"default","project_id":"onkho-web-app-live","version_id":"30-1"}},"timestamp":"2018-02-28T22:36:35.183183937Z","labels":{"compute.googleapis.com/resource_type":"instance","compute.googleapis.com/resource…
>  
> A    PID USER      PR  NI  VIRT  RES  SHR S  %CPU %MEM    TIME+  COMMAND 
> A      1 root      20   0 10664 1644 1508 S   0.0  0.0   0:00.82 init 
> A      2 root      20   0     0    0    0 S   0.0  0.0   0:00.00 kthreadd 
> A      3 root      20   0     0    0    0 S   0.0  0.0   0:00.04 ksoftirqd/0 
> A      4 root      20   0     0    0    0 S   0.0  0.0   0:00.00 kworker/0:0 
> A      5 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 kworker/0:0H 
> A      6 root      20   0     0    0    0 S   0.0  0.0   0:00.00 kworker/u8:0 
> A      7 root      20   0     0    0    0 S   0.0  0.0   0:00.09 rcu_sched 
> A      8 root      20   0     0    0    0 S   0.0  0.0   0:00.00 rcu_bh 
> A      9 root      rt   0     0    0    0 S   0.0  0.0   0:00.00 migration/0 
> A     10 root      rt   0     0    0    0 S   0.0  0.0   0:00.00 watchdog/0 
> A     11 root      rt   0     0    0    0 S   0.0  0.0   0:00.00 watchdog/1 
> A     12 root      rt   0     0    0    0 S   0.0  0.0   0:00.00 migration/1 
> A     13 root      20   0     0    0    0 S   0.0  0.0   0:00.03 ksoftirqd/1 
> A     14 root      20   0     0    0    0 S   0.0  0.0   0:00.00 kworker/1:0 
> A     15 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 kworker/1:0H 
> A     16 root      rt   0     0    0    0 S   0.0  0.0   0:00.00 watchdog/2 
> A     17 root      rt   0     0    0    0 S   0.0  0.0   0:00.00 migration/2 
> A     18 root      20   0     0    0    0 S   0.0  0.0   0:00.02 ksoftirqd/2 
> A     19 root      20   0     0    0    0 S   0.0  0.0   0:00.00 kworker/2:0 
> A     20 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 kworker/2:0H 
> A     21 root      rt   0     0    0    0 S   0.0  0.0   0:00.00 watchdog/3 
> A     22 root      rt   0     0    0    0 S   0.0  0.0   0:00.00 migration/3 
> A     23 root      20   0     0    0    0 S   0.0  0.0   0:00.02 ksoftirqd/3 
> A     24 root      20   0     0    0    0 S   0.0  0.0   0:00.00 kworker/3:0 
> A     25 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 kworker/3:0H 
> A     26 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 khelper 
> A     27 root      20   0     0    0    0 S   0.0  0.0   0:00.00 kdevtmpfs 
> A     28 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 netns 
> A     29 root      20   0     0    0    0 S   0.0  0.0   0:00.00 khungtaskd 
> A     30 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 writeback 
> A     31 root      25   5     0    0    0 S   0.0  0.0   0:00.00 ksmd 
> A     32 root      39  19     0    0    0 S   0.0  0.0   0:00.00 khugepaged 
> A     33 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 crypto 
> A     34 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 kintegrityd 
> A     35 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 bioset 
> A     36 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 kblockd 
> A     37 root      20   0     0    0    0 S   0.0  0.0   0:00.00 kworker/1:1 
> A     38 root      20   0     0    0    0 S   0.0  0.0   0:00.00 kswapd0 
> A     39 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 vmstat 
> A     40 root      20   0     0    0    0 S   0.0  0.0   0:00.00 
> fsnotify_mark 
> A     46 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 kthrotld 
> A     47 root      20   0     0    0    0 S   0.0  0.0   0:00.00 kworker/0:1 
> A     48 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 
> ipv6_addrconf 
> A     49 root      20   0     0    0    0 S   0.0  0.0   0:00.00 kworker/2:1 
> A     50 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 deferwq 
> A     51 root      20   0     0    0    0 S   0.0  0.0   0:00.01 kworker/u8:1 
> A    632 root      20   0     0    0    0 S   0.0  0.0   0:00.00 scsi_eh_0 
> A    633 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 scsi_tmf_0 
> A    634 root      20   0     0    0    0 S   0.0  0.0   0:00.00 kworker/u8:2 
> A    635 root      20   0     0    0    0 S   0.0  0.0   0:00.00 kworker/3:1 
> A    645 root       0 -20     0    0    0 S   0.0  0.0   0:00.02 kworker/0:1H 
> A    673 root      20   0     0    0    0 S   0.0  0.0   0:00.00 kworker/0:2 
> A    679 root      20   0     0    0    0 S   0.0  0.0   0:00.00 jbd2/sda1-8 
> A    680 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 
> ext4-rsv-conver 
> A    719 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 kworker/1:1H 
> A    726 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 kworker/2:1H 
> A    839 root      20   0 21928 3068 1956 S   0.0  0.0   0:00.09 udevd 
> A   1167 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 kworker/3:1H 
> A   1451 root      20   0 21924 2620 1580 S   0.0  0.0   0:00.00 udevd 
> A   1452 root      20   0 21924 2624 1580 S   0.0  0.0   0:00.00 udevd 
> A   1484 root      20   0     0    0    0 S   0.0  0.0   0:00.00 kworker/1:2 
> A   1489 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 kpsmoused 
> A   1490 root      20   0     0    0    0 S   0.0  0.0   0:00.00 kworker/3:2 
> A   1528 root      20   0     0    0    0 S   0.0  0.0   0:00.00 kworker/2:2 
> A   2668 root      20   0  9968 3180  888 S   0.0  0.0   0:00.00 dhclient 
> A   2749 root      20   0 18988 2016 1760 S   0.0  0.0   0:00.00 rpcbind 
> A   2780 statd     20   0 23360 2496 2032 S   0.0  0.0   0:00.00 rpc.statd 
> A   2785 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 rpciod 
> A   2787 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 nfsiod 
> A   2796 root      20   0 25312  216    4 S   0.0  0.0   0:00.00 rpc.idmapd 
> A   3086 root      20   0  115m 2668 2304 S   0.0  0.0   0:00.03 rsyslogd 
> A   3176 root      20   0  4132 1584 1440 S   0.0  0.0   0:00.00 acpid 
> A   3289 ntp       20   0 34892 4272 3672 S   0.0  0.1   0:00.00 ntpd 
> A   3360 root      20   0 20424 2152 1912 S   0.0  0.0   0:00.00 cron 
> A   3528 root      20   0  143m  42m  35m S   0.0  0.5   0:00.59 kubelet 
> A   3573 root      20   0  501m  32m  20m S   0.0  0.4   0:00.46 docker 
> A   3636 root      20   0  336m 9180 7600 S   0.0  0.1   0:00.03 
> docker-containe 
> A   3722 root      20   0  4112 1224 1124 S   0.0  0.0   0:00.00 startpar 
> A   3723 root      20   0 49332 9328 2888 S   0.0  0.1   0:00.00 
> manage_accounts 
> A   3750 root      20   0 53732  10m 4144 S   0.0  0.1   0:00.00 
> manage_accounts 
> A   3969 root      20   0  4196 1488 1328 S   0.0  0.0   0:00.00 rc 
> A   3978 root      20   0 12788 2576 1932 S   0.0  0.0   0:00.03 startpar 
> A   3980 root      20   0  4196 1460 1300 S   0.0  0.0   0:00.00 
> google-accounts 
> A   3983 root      20   0  4196 1564 1408 S   0.0  0.0   0:00.00 
> google-startup- 
> A   4008 root      20   0  4108 1520 1432 S   0.0  0.0   0:00.15 
> start-stop-daem 
> A   4011 root      20   0  9252 2356 2192 S   0.0  0.0   0:00.00 
> run-shutdown-sc 
> A   4082 root      20   0  9260 2252 2088 S   0.0  0.0   0:00.00 run-scripts 
> A   4085 root      20   0  9264 2244 2020 S   0.0  0.0   0:00.00 run-scripts 
> A   4095 root      20   0  9268 2240 2008 S   0.0  0.0   0:00.00 run-scripts 
> A   4096 root      20   0  4104  476  396 S   0.0  0.0   0:00.00 logger 
> A   4098 root      20   0  9460 2508 2080 S   0.0  0.0   0:00.00 run-scripts 
> A   4281 root      20   0  9464 2516 2084 S   0.0  0.0   0:00.00 run-scripts 
> A   4282 root      20   0  9460 1956 1528 S   0.0  0.0   0:00.00 run-scripts 
> A   4283 root      20   0 70732  20m 6660 S   0.0  0.3   0:00.12 python 
> A   4321 root      20   0 21676 2240 1932 R   0.0  0.0   0:00.00 top 
> A  Additional thread and heap info may be available in app.shutdown if you 
> are using a supported client library. 
> A  ------------------------------------------------------------------- 
>
>
> If I can't get to the bottom of this then we'll be forced to go back to 
> compute engine.
>
> Any help would be greatly appreciated.
>
>
>
>
> On Wednesday, February 28, 2018 at 10:05:36 PM UTC, Karl Tinawi wrote:
>>
>> Hi George,
>>
>> It's definitely not the code or our app's startup process as far as I'm 
>> aware because this issue is before our docker image is even pulled or any 
>> code of ours executed. The logs should show that clearly.
>>
>> The change I applied as per your suggested relating to the health checks 
>> did not involve any code change whatsoever and yet the VM starts normally 
>> now. The only difference being that I now see the new health check requests 
>> in the logs during the startup process.
>>
>> I'll continue testing and reply with any additional findings.
>>
>> I'd be grateful if you could shed some more light on the incident in 
>> question as I still don't have an answer as to what happened.
>>
>>
>>
>> On Wednesday, February 28, 2018 at 9:40:49 PM UTC, George (Cloud Platform 
>> Support) wrote:
>>>
>>> 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 <ka...@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. 
>>>>>>
>>>>>>
>>>>>> -- 
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>>>>  
>>>> <https://groups.google.com/d/msgid/google-appengine/fe551f25-65ef-4eef-a1fd-7e53e44f0f06%40googlegroups.com?utm_medium=email&utm_source=footer>
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>>>>
>>>> For more options, visit https://groups.google.com/d/optout.
>>>>
>>>
>>>

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  • [google-appengine]... Karl Tinawi
    • [google-appen... 'George (Cloud Platform Support)' via Google App Engine
      • [google-a... 'George (Cloud Platform Support)' via Google App Engine
        • [goog... Karl Tinawi
          • [... Karl Tinawi
            • ... 'George Suceveanu' via Google App Engine
              • ... Karl Tinawi
                • ... Karl Tinawi
                • ... Karl Tinawi
                • ... 'George (Cloud Platform Support)' via Google App Engine
                • ... Karl Tinawi
                • ... Karl Tinawi
                • ... 'George (Cloud Platform Support)' via Google App Engine
                • ... Karl Tinawi
                • ... 'George (Cloud Platform Support)' via Google App Engine
          • [... Karl Tinawi
            • ... 'George (Cloud Platform Support)' via Google App Engine

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