Node Troubleshooting

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General Troubleshooting Steps

1. Check Container Logs: This is usually the most informative step. Use docker compose logs -f <service_name> to view the real-time logs for a specific container.
   • L2 Client (Geth): docker compose logs -f op-geth
   • L2 Client (Reth): docker compose logs -f op-reth
   • Rollup Node: docker compose logs -f op-node. Look for errors, warnings, or repeated messages.
2. Check Container Status: Ensure the relevant Docker containers are running: docker compose ps. If a container is restarting frequently or exited, check its logs.
3. Check Resource Usage: Monitor your server’s CPU, RAM, disk I/O, and network usage. Performance issues are often linked to insufficient resources. Tools like htop, iostat, and iftop can be helpful.
4. Verify RPC Endpoints: Use curl to check if the L2 client’s RPC endpoint is responding (see Running a Base Node > Verify Node is Running). Also, verify your L1 endpoints are correct and accessible from the node server.
5. Check L1 Node: Ensure your configured L1 node (Execution and Consensus) is fully synced, healthy, and accessible. Issues with the L1 node will prevent the L2 node from syncing correctly.

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Common Issues and Solutions

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Setup & Configuration Issues

• Issue: Docker command fails (docker compose up ...)
  • Check: Is Docker and Docker Compose installed and the Docker daemon running?
  • Check: Are you in the correct directory (the cloned node directory containing docker-compose.yml)?
  • Check: Syntax errors in the command (e.g., misspelled NETWORK_ENV or CLIENT).
• Issue: Container fails to start, logs show errors related to .env files or environment variables.
  • Check: Did you correctly configure the L1 endpoints (OP_NODE_L1_ETH_RPC, OP_NODE_L1_BEACON) in the correct .env file (.env.mainnet or .env.sepolia)?
  • Check: Is the OP_NODE_L1_BEACON_ARCHIVER endpoint set if required by your configuration or L1 node?
  • Check: Is OP_NODE_L1_RPC_KIND set correctly for your L1 provider?
  • Check: (Reth) Are RETH_CHAIN and RETH_SEQUENCER_HTTP correctly set in the .env file?
• Issue: Errors related to JWT secret or authentication between op-node and L2 client.
  • Check: Ensure you haven’t manually modified the OP_NODE_L2_ENGINE_AUTH variable or the JWT file path ($OP_NODE_L2_ENGINE_AUTH) unless you know what you’re doing. The docker-compose setup usually handles this automatically.
• Issue: Permission errors related to data volumes (./geth-data, ./reth-data).
  • Check: Ensure the user running docker compose has write permissions to the directory where the node repository was cloned. Docker needs to be able to write to ./geth-data or ./reth-data. Sometimes running Docker commands with sudo can cause permission issues later; try running as a non-root user added to the docker group.

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Syncing Problems

• Issue: Node doesn’t start syncing or appears stuck (block height not increasing).
  • Check: op-node logs. Look for errors connecting to L1 endpoints or the L2 client.
  • Check: L2 client (op-geth/op-reth) logs. Look for errors connecting to op-node via the Engine API (port 8551) or P2P issues.
  • Check: L1 node health and sync status. Is the L1 node accessible and fully synced?
  • Check: System time. Ensure the server’s clock is accurately synchronized (use ntp or chrony). Significant time drift can cause P2P issues.
• Issue: Syncing is extremely slow.
  • Check: Hardware specifications. Are you meeting the recommended specs (especially RAM and NVMe SSD) outlined in the Node Performance guide? Disk I/O is often the bottleneck.
  • Check: L1 node performance. Is your L1 RPC endpoint responsive? A slow L1 node will slow down L2 sync.
  • Check: Network connection quality and bandwidth.
  • Check: op-node and L2 client logs for any performance warnings or errors.
• Issue: optimism_syncStatus (port 7545 on op-node) shows a large time difference or errors.
  • Action: Check the logs for both op-node and the L2 client (op-geth/op-reth) around the time the status was checked to identify the root cause (e.g., L1 connection issues, L2 client issues).
• Issue: Error: nonce has already been used when trying to send transactions.
  • Cause: The node is not yet fully synced to the head of the chain.
  • Action: Wait for the node to fully sync. Monitor progress using optimism_syncStatus or logs.

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Performance Issues

• Issue: High CPU, RAM, or Disk I/O usage.
  • Check: Hardware specifications against recommendations in the Node Performance. Upgrade if necessary. Local NVMe SSDs are critical.
  • Check: (Geth) Review Geth cache settings and LevelDB tuning options mentioned in Node Performance – Geth Performance Tuning and Advanced Configuration.
  • Check: Review client logs for specific errors or bottlenecks.
  • Action: Consider using Reth if running Geth, as it’s generally more performant for Base.

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Snapshot Restoration Problems

• Issue: wget command fails or snapshot download is corrupted.
  • Check: Network connectivity.
  • Check: Available disk space.
  • Action: Retry the download. Verify the download URL is correct.
• Issue: tar extraction fails.
  • Check: Downloaded file integrity (is it corrupted?).
  • Check: Available disk space (extraction requires much more space than the download).
  • Check: tar command syntax.
• Issue: Node fails to start after restoring snapshot; logs show database errors or missing files.
  • Check: Did you stop the node (docker compose down) before modifying the data directory?
  • Check: Did you remove the contents of the old data directory (./geth-data/* or ./reth-data/*) before extracting/moving the snapshot data?
  • Check: Was the snapshot data moved correctly? The chain data needs to be directly inside ./geth-data or ./reth-data, not in a nested subfolder (e.g., ./geth-data/geth/...). Verify the folder structure.
• Issue: Ran out of disk space during download or extraction.
  • Action: Free up disk space or provision a larger volume. Remember the storage formula:
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    (2 * chain_size + snapshot_size + 20% buffer)  
    

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Networking / Connectivity Issues

• Issue: RPC/WS connection refused (e.g., curl to localhost:8545 fails).
  • Check: Is the L2 client container (op-geth/op-reth) running (docker compose ps)?
  • Check: Are you using the correct port (8545 for HTTP, 8546 for WS by default)?
  • Check: L2 client logs. Did it fail to start the RPC server?
  • Check: Are the --http.addr and --ws.addr flags set to 0.0.0.0 in the client config/entrypoint to allow external connections (within the Docker network)?
• Issue: Node has low peer count.
  • Check: P2P port (default 30303) accessibility. Is it blocked by a firewall on the host or network?
  • Check: Node logs for P2P errors.
  • Action: If behind NAT, configure the --nat=extip:<your-ip> flag via ADDITIONAL_ARGS in the .env file (see Advanced Configuration).
• Issue: Port conflicts reported in logs or docker compose up fails.
  • Check: Are other services running on the host using the default ports (8545, 8546, 8551, 6060, 7545, 30303)? Use
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    sudo lsof -i -P -n | grep LISTEN
    sudo netstat -tulpn | grep LISTEN
    

  • Action: Stop the conflicting service or change the ports used by the Base node containers by modifying the ports section in docker-compose.yml and updating the relevant environment variables ($RPC_PORT, $WS_PORT, etc.) in the .env file if necessary.

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Getting Further Help

• Discord: Join the Base Discord and post in the 🛠｜node-operators channel, providing details about your setup, the issue, and relevant logs.
• GitHub: Check the Base Node repository issues or open a new one if you suspect a bug.