Google App Engine上的持续集成/部署/交付风险太大了？

我们最近在Google App Engine上 Build 了nodejs webapp的持续集成/部署/交付 . CI服务器（GitLabCI）根据分支（develop / master）运行依赖项安装，构建，测试和部署到集成/产品 .

在今天的日子里，我们唯一关心它的错误 . 但是昨天（2016年10月21日），发生了大规模的DNS中断，管道在部署步骤中失败了， breaking down the prod . 简单地重新运行管道已经完成了工作，但问题可以随时重现 .

我的问题是：

• 在持续部署过程中，我们如何处理这类网络问题？

• Google App Engine上的持续部署真的是个好主意吗？

• 如果是这样，App Engine的部署方法是什么？我没有找到任何相关的文件......

目前我们只有两个版本“dev”和“prod”在提交后更新，但在随机时间我可以观察到奇怪的行为 .

我们非常欢迎任何回复/建议/反馈！

有关我正在讨论的网络问题的堆栈跟踪示例：

DEBUG: Error sending result: 'MetadataServerException(HTTPError(),)'. Reason: 'PicklingError("Can't pickle <type 'cStringIO.StringO'>: attribute lookup cStringIO.StringO failed",)'
Traceback (most recent call last):
  File "/google-cloud-sdk/lib/googlecloudsdk/calliope/cli.py", line 733, in Execute
    resources = args.calliope_command.Run(cli=self, args=args)
  File "/google-cloud-sdk/lib/googlecloudsdk/calliope/backend.py", line 1630, in Run
    resources = command_instance.Run(args)
  File "/google-cloud-sdk/lib/surface/app/deploy.py", line 53, in Run
    return deploy_util.RunDeploy(self, args)
  File "/google-cloud-sdk/lib/googlecloudsdk/command_lib/app/deploy_util.py", line 387, in RunDeploy
    all_services)
  File "/google-cloud-sdk/lib/googlecloudsdk/command_lib/app/deploy_util.py", line 247, in Deploy
    manifest = _UploadFiles(service, code_bucket_ref)
  File "/google-cloud-sdk/lib/googlecloudsdk/command_lib/app/deploy_util.py", line 115, in _UploadFiles
    service, code_bucket_ref)
  File "/google-cloud-sdk/lib/googlecloudsdk/api_lib/app/deploy_app_command_util.py", line 277, in CopyFilesToCodeBucketNoGsUtil
    _UploadFiles(files_to_upload, bucket_ref)
  File "/google-cloud-sdk/lib/googlecloudsdk/api_lib/app/deploy_app_command_util.py", line 219, in _UploadFiles
    results = pool.map(_UploadFile, tasks)
  File "/usr/lib/python2.7/multiprocessing/pool.py", line 251, in map
    return self.map_async(func, iterable, chunksize).get()
  File "/usr/lib/python2.7/multiprocessing/pool.py", line 558, in get
    raise self._value
MaybeEncodingError: Error sending result: 'MetadataServerException(HTTPError(),)'. Reason: 'PicklingError("Can't pickle <type 'cStringIO.StringO'>: attribute lookup cStringIO.StringO failed",)'
DEBUG: Exception captured in Error
Traceback (most recent call last):
  File "/google-cloud-sdk/lib/googlecloudsdk/core/metrics.py", line 411, in Wrapper
    return func(*args, **kwds)
TypeError: Error() takes exactly 3 arguments (1 given)
ERROR: gcloud crashed (MaybeEncodingError): Error sending result: 'MetadataServerException(HTTPError(),)'. Reason: 'PicklingError("Can't pickle <type 'cStringIO.StringO'>: attribute lookup cStringIO.StringO failed",)'
Traceback (most recent call last):
  File "/google-cloud-sdk/lib/gcloud.py", line 65, in <module>
    main()
  File "/google-cloud-sdk/lib/gcloud.py", line 61, in main
    sys.exit(googlecloudsdk.gcloud_main.main())
  File "/google-cloud-sdk/lib/googlecloudsdk/gcloud_main.py", line 145, in main
    crash_handling.HandleGcloudCrash(err)
  File "/google-cloud-sdk/lib/googlecloudsdk/command_lib/crash_handling.py", line 107, in HandleGcloudCrash
    _ReportError(err)
  File "/google-cloud-sdk/lib/googlecloudsdk/command_lib/crash_handling.py", line 86, in _ReportError
    util.ErrorReporting().ReportEvent(error_message=stacktrace,
  File "/google-cloud-sdk/lib/googlecloudsdk/api_lib/error_reporting/util.py", line 28, in __init__
    self._API_NAME, self._API_VERSION)
  File "/google-cloud-sdk/lib/googlecloudsdk/core/apis.py", line 254, in GetClientInstance
    http_client = http.Http()
  File "/google-cloud-sdk/lib/googlecloudsdk/core/credentials/http.py", line 60, in Http
    creds = store.Load()
  File "/google-cloud-sdk/lib/googlecloudsdk/core/credentials/store.py", line 282, in Load
    if account in c_gce.Metadata().Accounts():
  File "/google-cloud-sdk/lib/googlecloudsdk/core/credentials/gce.py", line 122, in Accounts
    gce_read.GOOGLE_GCE_METADATA_ACCOUNTS_URI + '/')
  File "/google-cloud-sdk/lib/googlecloudsdk/core/util/retry.py", line 160, in TryFunc
    return func(*args, **kwargs), None
  File "/google-cloud-sdk/lib/googlecloudsdk/core/credentials/gce.py", line 45, in _ReadNoProxyWithCleanFailures
    raise MetadataServerException(e)
googlecloudsdk.core.credentials.gce.MetadataServerException: HTTP Error 503: Service Unavailable
DEBUG: Uploading [/builds/apps/webapp/lib/jinja2/defaults.pyc] to [151c77b4e5bdd2c38b6a2bf914fffa3a6ffa71a6]
INFO: Uploading [/builds/apps/webapp/lib/jinja2/defaults.pyc] to [151c77b4e5bdd2c38b6a2bf914fffa3a6ffa71a6]
INFO: Refreshing access_token