The second computer inside every server — the BMC — and how to drive it for out-of-band management. IPMI and its modern Redfish REST successor: power control, serial-over-LAN, sensors, and automating it all instead of clicking vendor web UIs.
Datacenter
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IPMI and Redfish: Out-of-Band Management for Humans -
BGP for Engineers: How the Internet Routes Itself A practical guide to Border Gateway Protocol — how eBGP and iBGP work, route selection, path attributes, and running BGP in the datacenter with FRRouting.