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Merge pull request #6721 from vognev/docs/kubeless-url-zip

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documented url+zip deploy strategy for serverless-kubeless
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Philipp Muens 2019-09-24 09:47:26 +02:00 committed by GitHub
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docs/providers/kubeless/guide/deploying.md
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Kubeless will create a [Kubernetes Deployment](https://kubernetes.io/docs/concepts/workloads/controllers/deployment/) for your function and a [Kubernetes service](https://kubernetes.io/docs/concepts/services-networking/service/) for each event.
Deployment will spin up a [Pod](https://kubernetes.io/docs/concepts/workloads/pods/pod-overview/)) based on runtime you have defined in your `serverless.yml`. Runtime is a public docker image, providing only binaries for your code. Function code itself is injected into Pod by `kubeless-controller-manager` and stored in Kubernetes Function object definition.
Kubernetes Function definition has a size limit, since it is stored as yaml in cluster's etcd. So, you can't deploy function any larger than approximately 1.5MB.
In order to overcome this limitation, function code can be fetched from [external url](https://kubeless.io/docs/advanced-function-deployment/); in this case only link (and checksum) is stored in Kubernetes function definition. Starting from v0.8.0 of `serverless-kubeless`, you can change default deployment method to `S3ZipContent` and configure `serverless-kubeless` with S3 bucket, where the function code will be stored:
```yaml
provider:
name: kubeless
runtime: python2.7
deploy:
strategy: S3ZipContent
options:
accessKeyId: minio
secretAccessKey: minio123
endpoint: http://minio.local
bucket: workbench
region: eu-central-1
s3ForcePathStyle: True
```
## Deploy Function
This deployment method updates or deploys a single function. It performs the platform API call to deploy your package without the other resources. It is much faster than redeploying your whole service each time.