s-u/macosvm

Possible to set or determine IP or MAC address for ephemeral instances?

getchardy opened this issue · 3 comments

getchardy commented

I am using the --ephemeral flag when running for macosvm in a GitLab Runner custom executor. If 2 jobs start at the same time, is there a trick to mapping the process ID with the IP or MAC address that gets assigned to the instance?

Is it possible to specify a MAC address via config file or command line argument? (Then I could identify the IP using arp -a.)

Thanks for your work on this project!

s-u commented

@getchardy very good question and idea! As far as I can tell the VZ framework allows the specification of a MAC address, so that should be easy enough to add.

s-u commented

Ok, I have added a few features in 2b50b39 related to this:

  • macosvm prints the MAC address of the interfaces at startup, e.g.: 
    2022-10-20 11:51:12.961 macosvm[7301:114344]  + network: ether 12:0e:05:bb:82:96
  • The network specification in the json file supports a dictionary entry "mac" with the MAC address, so a network specification may look like this: 
    "networks":[{"type":"nat","mac":"12:34:56:aa:bb:cc"}]
  • The command line argument --net nat:<MAC> can be used to add a nat network with specific MAC address
  • Finally a new argument --mac <MAC> overrides the MAC address of first network in the configuration. It is processed last after all arguments and the configuration file so this is a way to unconditionally override a MAC address on the command line. This is likely the most useful of the lot if you are using --ephemeral.
getchardy commented

That is fantastic, being able to see the auto-assigned MAC is super helpful!

Many thanks!