Greetings, There has been some discussion in my group about setting something up to capture kdump files in a single location. Never messed with it before, but it seems pretty straight forward as /etc/kdump.conf is very well documented.
My question: What is the best way to compress for sending to remote scp in a kdump? Longer version and configuration: Set up a couple of SL7 virtual machines to start testing. Default configuration: $ sed -e '/^#/d' /etc/kdump.conf path /var/crash core_collector makedumpfile -l --message-level 1 -d 31 My changes: $ sed -e '/^#/d' /etc/kdump.conf ssh root@10.10.10.12 sshkey /root/.ssh/kdump_id_rsa path /data/kdump_crash core_collector scp $ kdumpctl propagate $ systemctl restart kdump Whoo! It works...Huh...My crash seems to take a long time...Oh, look at that, my vmcore is 4GB in size (vm memory size). o_O I really don't think my other crashes are nearly that large...Reset to default config and force a crash. 39MB. Ah, the '-l' option of makedumpfile uses LZO compression. Makes sense. Looking at the kdump.conf man page, I should be able to use makedumpfile to compress then send to scp. $ sed -e '/^#/d' /etc/kdump.conf ssh root@10.10.10.12 sshkey /root/.ssh/kdump_id_rsa path /data/kdump_crash core_collector makedumpfile -F -l --message-level 1 -d 31 Hrm. It will only work if I specify '-F' which gives me a 'vmcore.flat' instead of a normal 'vmcore' which my crash tools don't seem to like. Looks like I can do conversions from a vmcore.flat file to use the debug tools, but I don't like that. I've tinkered with a few other options unsuccessfully. My options look like: uncompressed (which will be fun with my 512GB nodes!) or vmcore.flat files. Any thoughts on the best way to compress the vmcore file while still sending over scp? Thanks! ~Stack~
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