https://bugzilla.wikimedia.org/show_bug.cgi?id=57834

       Web browser: ---
            Bug ID: 57834
           Summary: provide bastion redundancy via DNS round robin
           Product: Wikimedia Labs
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: Unprioritized
         Component: Infrastructure
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected]
    Classification: Unclassified
   Mobile Platform: ---

The labs project has three instances we can connect to:

bastion1  208.80.153.207
bastion2  208.80.153.203
bastion3  208.80.153.202

They each have a DNS entry in wmflabs.org.

I have setup my ssh ProxyCommand to point to bastion.wmflabs.org expecting it
to pick up one of the bastions. Unfortunately the DNS A record points to
208.80.153.207 (bastion1). Whenever that instance is dead I have to update my
ProxyCommand manually.


We could make bastion.wmflabs.org a round robin DNS entry that would distribute
incoming connections to the different bastion instances. To do so:

- bastion.wmflabs.org should have three A entries
- the DNS server needs to be configured to yield the entry using round robin
(aka change order on each DNS request).
- all three bastions need to share the same SSH host key

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