Is there a way to start a parachain node in CI and instruct it through a binary flag not to sync with the relay chain? I think it would be the same to say I want the P2P functionality to be off. Thank you.

2 Answers 2


You can run with --in-peers 0 --out-peers 0 to prevent sync connecting to any peers.


Specifying the option --reserved-only does spawn a private network. If the --reserved-nodes option is missing or if it contains invalid multiaddresses, the node won't connect and sync with other nodes.

When launching a node, the options after the double dash -- affect the relay chain, e.g. ./parachain --reserved-only targets the parachain, ./parachain -- --reserved-only targets the relay chain.

  • Thank you for your answer. So, if I want to start an isolated parachain node in CI, should I be passing both --reserved-only -- --reserved-only? I only need this node temporarily to read metadata.
    – demisx
    Jan 27, 2023 at 17:07
  • 1
    @demisx If you plan to completely isolate the node, i.e. neither the parachain nor the relaychain should connect to other peers, than this combination of command options is suitable.
    – sea212
    Jan 27, 2023 at 17:22

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