I'm in the middle of upgrading our existing HPC (from RHEL 6 to RHEL 7). I'm doing most of my testing on a separate "sandbox" test bed, but now I'm close to going live. I'm trying to figure out how to do this with minimal disruption.
My question: how can I install the new management node and keep it *almost* completely operational, without interfering with the existing cluster? Is it enough to disable DHCP, or do I need to do anything else? How do I prevent DHCP from accidentally getting enabled before I'm ready? Is makedhcp responsible for that? Step-by-step, here is what I plan to do: - Set up the new management node, but keep it inactive. - Test - Bring down all compute nodes. - Via IPMI, reset all the compute nodes' BMC controllers to DHCP - Other migration steps (home directories, modifications on the storage node, etc.) - De-activate the old management node (but keep it running) - Activate the new management node. - Discover and boot compute nodes Is there anything glaringly obvious that I overlooked? Thanks! _______________________________________________________________________ Kevin Keane | Systems Architect | University of San Diego ITS | kke...@sandiego.edu Maher Hall, 192 |5998 Alcalá Park | San Diego, CA 92110-2492 | 619.260.6859 *REMEMBER! **No one from IT at USD will ever ask to confirm or supply your password*. These messages are an attempt to steal your username and password. Please do not reply to, click the links within, or open the attachments of these messages. Delete them!
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