The stack

Part 2

A stack is a tree of modules on a machine that may never have built them. EESSI is one such tree. CernVM-FS is how it arrives. A site stack is next to it. This part is that arrival: the stratum, the bot, the easystack file, and the host injection.

EESSI, somebody else’s stack is the first read if the machine has no software of its own.

• EESSI, somebody else’s stack
• Reading a stack off the wire: CernVM-FS
• The same stack somewhere else
• An easystack is the list the bot will build
• The bot is three processes and a comment
• A site stack next to EESSI, not inside it