It is possible to use external builders and launchers, but not to use ccaas, so I don't have to modify my actual chaincode and I could deploy it on K8s? Is there any example with java script chaincode so I can use those external builders? Thank you.
Fabric on Kuberntes without chaincode as a service
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You might want to look at the fabric-builder-k8s project. This does change the way you package the chaincode but should not require any change to the actual chaincode implementation itself.
Fabric-builder-k8s uses a custom builder (registered with the Fabric peer) to allow Fabric to spin up the chaincode container as a Kubernetes pod (from a published Docker image containing your chaincode implementation) in a similar way that the default chaincode builder spins up Docker containers from the chaincode implementation bundled within your chaincode package.