I have been wondering how sed commands can be used in ltsp init scripts to modify configuration files before services are run and before there is an ssh session on the server. Which is to say, how does that work with a read-only NBD boot image?

I have seen some mention of the use of a union filesystem with a writable overlay directory (such as in a RAM disk or in the mounted /var directory on the server). Or else in a similar scheme, with the use of a Copy-on-Write scheme which again directs writes to another destination.

Anyone care to scribe a few linesabout how LTSP accomplishes this?


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