Polkadot Multi Chain Kubernetes Testnet Example

1. Setup your Kubernetes cluster, eg. locally you can use Rancher-desktop or Minikube

2. Install helmfile

3. Run helmfile sync

4. kubectl port-forward -n rococo validator-alice-node-0 9944 and open polkadot.js.org/apps/?rpc=ws%3A%2F%2F127.0.0.1%3A9944

5. k port-forward -n rococo svc/testnet-manager 8080:80 and open localhost:8080

6. Onboard paras via gui or cmd line:

curl -X 'POST' 'http://localhost:8080/api/onboard_parachain/2000' -H 'accept: application/json' -d ''
curl -X 'POST' 'http://localhost:8080/api/onboard_parachain/3000' -H 'accept: application/json' -d ''

7. Setup hrmp channels

Install polkadot-js api-cli

If you have npm:

npm -g i @polkadot/api-cli

Or with docker/podman:

alias polkadot-js-api="docker run --network=host jacogr/polkadot-js-tools api"

Test that it works with:

polkadot-js-api --ws ws://127.0.0.1:9944 query.system.account 5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY

polkadot-js-api --ws ws://127.0.0.1:9944 tx.parasSudoWrapper.sudoEstablishHrmpChannel 2000 3000 8 1024   --seed "//Alice" --sudo
polkadot-js-api --ws ws://127.0.0.1:9944 tx.parasSudoWrapper.sudoEstablishHrmpChannel 3000 2000 8 1024   --seed "//Alice" --sudo

8. Transfer asset from parachain 2k to parachain 3k:

polkadot-js-api tx.polkadotXcm.limitedReserveTransferAssets '{"v1":{"parents":1,"interior":{"x1":{"parachain":3000}}}}' '{"v1":{"parents":0,"interior":{"x1":{"AccountId32": {"id": "0x90b5ab205c6974c9ea841be688864633dc9ca8a357843eeacf2314649965fe22", "network": "Any"}}}}}' '{"v1": [ {"id": { "Concrete": {"parents":0, "interior":{"x2": [ {"PalletInstance":12}, {"GeneralIndex":0}] }}}, "Fun": { "Fungible": "320008009"}}]}' 0 Unlimited  --ws ws://127.0.0.1:9945 --seed "//Alice"

9. Result

See assets.Issued to Charlie on parachain 3k.

Resources:

• Kubernetes section of the Substrate Devops Guide

Notes:

• rococo-local-chainspec.json was generated with: polkadot build-spec --chain rococo-local > rococo-local-chainspec.json
• rococo-local-chainspec.json was generated with: polkadot build-spec --chain rococo-local-chainspec.json --raw > rococo-local-chainspec-raw.json