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Step 3: Run an Octez DAL node

The DAL node is responsible for temporarily storing data and providing it to bakers and Smart Rollups. As described in Run a Tezos node in 5 steps, 10% of baker rewards are tied to their participation in attesting DAL data.

Follow these steps to run the DAL node:

  1. Ensure that the port on which the DAL node listens for connections from peer nodes (by default, 11732) is accessible from outside its system. You may need to adapt your firewall rules or set up network address translation (NAT) to direct external traffic to the DAL node. For more information, see Running a DAL attester node in the Octez documentation.

  2. Initialize the DAL node by running its config init command, passing the address of your octez-node instance in the --endpoint argument and your baker's key address (not the consensus key) in the --attester-profiles argument. For example, this command initializes the DAL node with the address of a local octez-node instance on port 8732 and stores data in the default DAL node directory (~/.tezos-dal-node):

    octez-dal-node config init --endpoint http://127.0.0.1:8732 \
      --attester-profiles=tz1...

    You cannot use the my_baker alias from the Octez client as in the previous section, so you must specify the baker's key address (not its consensus key) explicitly.

  3. Start the DAL node by running this command:

    octez-dal-node run

    You may append >>"$HOME/octez-dal-node.log" 2>&1 to redirect its output in a log file.

    This, too, may take some time to launch the first time because it needs to generate a new identity file, this time for the DAL network.

    If you need to change the address or port that the DAL node listens for connections to other nodes on, pass the --public-addr argument. By default, it listens on port 11732 on all available network interfaces, equivalent to --public-addr 0.0.0.0:11732.

  4. Verify that the DAL node is connected to the DAL network by running this command:

    curl http://localhost:10732/p2p/points/info

    where 10732 is the default port on which the DAL node serves RPC calls. You can override it with the --rpc-addr argument.

    You may need to install the curl program.

    The response lists the network connections that the DAL node has, as in this example:

    [
      {
        "point": "46.137.127.32:11732",
        "info": {
          "trusted": true,
          "state": {
            "event_kind": "running",
            "p2p_peer_id": "idrpUzezw7VJ4NU6phQYuxh88RiU1t"
          },
          "p2p_peer_id": "idrpUzezw7VJ4NU6phQYuxh88RiU1t",
          "last_established_connection": [
            "idrpUzezw7VJ4NU6phQYuxh88RiU1t",
            "2024-10-24T15:02:31.549-00:00"
          ],
          "last_seen": [
            "idrpUzezw7VJ4NU6phQYuxh88RiU1t",
            "2024-10-24T15:02:31.549-00:00"
          ]
        }
      },
      {
        "point": "52.31.26.230:11732",
        "info": {
          "trusted": true,
          "state": {
            "event_kind": "running",
            "p2p_peer_id": "idqrcQybXbKwWk42bn1XjeZ33xgduC"
          },
          "p2p_peer_id": "idqrcQybXbKwWk42bn1XjeZ33xgduC",
          "last_established_connection": [
            "idqrcQybXbKwWk42bn1XjeZ33xgduC",
            "2024-10-24T15:02:31.666-00:00"
          ],
          "last_seen": [
            "idqrcQybXbKwWk42bn1XjeZ33xgduC",
            "2024-10-24T15:02:31.666-00:00"
          ]
        }
      }
    ]

    It may take a few minutes for the node to connect to the DAL network.

    You can also verify that the DAL node is connected by viewing its log. When the node is bootstrapped it logs messages that look like this:

    Aug 12 17:44:19.985: started tracking layer 1's node
    Aug 12 17:44:24.418: layer 1 node's block at level 7538687, round 0 is final
    Aug 12 17:44:29.328: layer 1 node's block at level 7538688, round 0 is final

    The DAL node waits for blocks to be finalized, so this log lags 2 blocks behind the layer 1 node's log.

    Now the DAL node is connected to the DAL network but it is not yet receiving data.

  5. Ensure that the DAL node runs persistently. Look up how to run programs persistently in the documentation for your operating system. You can also refer to Setting up Octez Services in the Octez documentation.

    For example, if your operating system uses the systemd software suite, your service file might look like this example:

    [Unit]
    Description=Octez DAL node
    Wants=network-online.target
    After=network-online.target
    Requires=octez-node.service

    [Install]
    WantedBy=multi-user.target
    RequiredBy=octez-baker.service

    [Service]
    Type=simple
    User=tezos
    ExecStart=/usr/bin/octez-dal-node run --data-dir $HOME/.tezos-dal-node
    WorkingDirectory=$HOME/.tezos-dal-node
    Restart=on-failure
    RestartSec=5
    StandardOutput=append:/opt/octez-dal-node.log
    StandardError=append:/opt/octez-dal-node.log
    SyslogIdentifier=%n

Now that you have a DAL node running, you can start a baking daemon that uses that DAL node. Continue to Step 4: Run an Octez baking daemon.

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