Assuming you have a DB node bound in jepsen.client, returns the IP address of the control node, as perceived by that DB node. This is helpful when you want to, say, set up a tcpdump filter which snarfs traffic coming from the control node.

Look up an ip for a hostname. Memoized.

Look up an ip for a hostname. Unmemoized.

The local node’s IP address

Can the current node ping the given node?