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TROUBLESHOOTING.md

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Description

This documents helps with common troubleshooting scenarios

Troubleshooting Remote Copy of Mongod Logs and FTDC Failures due to Known Hosts Error

  • Understanding the known_hosts file: The known_hosts file is a security feature used by SSH (Secure Shell) to verify the identity of remote hosts. It stores the public keys of all known hosts, which are used to authenticate connections.
  • Step 1: Verify the known_hosts file + Ensure that the known_hosts file is properly populated with the nodes you're trying to connect to. + Check if the file exists in the default location (~/.ssh/known_hosts) and contains the public keys of all expected hosts.
  • Step 2: Configure SSH to skip known hosts checking (Workaround)
    + Edit the ~/.ssh/config file using a text editor (e.g., nano or vim). + Add the following lines to the end of the file:
     Host *
         UserKnownHostsFile /dev/null
         StrictHostKeyChecking no
  • Step 3: Test the connection: Try running ssh on remote nodes to see that it does not prompt for known_hosts.

Note: This workaround disables strict host key checking, which may compromise security. It's recommended to properly populate the known_hosts file or use a more secure alternative solution.