#arpnetworks 2015-12-13,Sun

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WhoWhatWhen
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mnathanimnathani drops a pin [22:09]
mercutiothe world explodes.
mercutio wonders why he touches old hardware; another computer with grub issues
this time i just get a cursor in the top left and no information :)
[22:19]
mkbgrub2? [22:20]
mercutioyip
have you seen it before?
[22:20]
mkbnope
but good luck getting grub2 to do anything useful
[22:21]
mercutioweirdly i found the fastest sata drives i've ever seen in an old server [22:22]
mkbI've spent hours learning to configure it to change the damn default kernel [22:22]
mercutiooh that's quite easy [22:22]
mkbif you know how tell me [22:22]
mercutiowas about to cut and paste
but hit the tab up top
hangon
#GRUB_DEFAULT="Arch Linux, with Linux 3.19.0blink"
you do something like that
with just the name
[22:22]
mkbwhere? it's got like 20 config files now [22:23]
mercutioin /etc/default/grub
then you update your grub
[22:23]
mkbhow? [22:24]
mercutioin arch it's grub-mkconfig -o /boot/grub/grub.cfg
in ubuntu it's update-grub
i suspect grub-mkconfig -o . .. etc will work on both
[22:25]
mkband it seems to be grub2-mkconfig on rhel [22:26]
mercutiolooks like i have to move my cables around
the bios doesn't like booting from 3rd disk
heh
yeh it can vary a bit which is why i didn't try to say how :)
[22:27]
mkbyeah and the only docs are in random places on google unfortunately [22:28]
mercutioheh [22:28]
mkbmake install in the kernel sources knows how to modify the config [22:28]
mercutioyeah i'm not a huge fan but it tends to work ok when it works. [22:28]
mkb(yes I work on the kernel but don't know how to set the default) [22:28]
mercutioahh i just copy mine to right place and do update-grub / grub-mkconfig
yeah it took me a little digging
it actually changed :/
ubuntu used to have this annoying default of using savedefault and it would always wait for a key press
because it couldn't update the save thing.
otherwise lots of things like to default to newest kernel
which if you're fiddling with kernel stuff is annoying :)
[22:28]
mkbI think it tries to remember what you selected at the last boot prompt [22:31]
mercutioyeh that used to be the case [22:31]
mkbrhel is perpetually old [22:31]
mercutiothink people generally moved away from that
arch has #GRUB_SAVEDEFAULT="true"
but i think it defaults to false.
oh it may still save
[22:31]
mkbbut that means I have to walk down the hall to the servers and hook everything up to toggle it [22:31]
mercutioyou have to set that GRUB_DEFAULT to the saved entry if you want that think.
yeah
have you got AMT?
[22:32]
mkbI don't have a savedefault line
we have something based on xcat
it doesn't work very well
[22:32]
mercutioAMT let's you do serial console on cheap hardware :)
like desktops
so uhh in theory you can have grub output to serial
and you can just access that over network
in practice grub has a bug :/
[22:33]
mkbthis thing stops and says waiting for ISOL or something 75% of the time you use it [22:34]
mercutiooh
it's a proper server?
[22:34]
mkboh yeah [22:34]
mercutiodesktops tend to boot quicker
if you're playing with kernel stuff
like my hp 6300 sff boots fast.
[22:34]
mkboh that's another source of unending annoyance [22:34]
mercutioyes :) [22:34]
mkbI hate dell's BIOS
the damn thing stops and waits for a keypress sometimes
[22:35]
mercutiohahaha
i've been thinking about getting another hp 6300
[22:35]
mkbwe've got a monitor in the rack but it's just a little too short [22:35]
mercutiothey're a lot more stress free for tesing stuff hah [22:35]
mkbthe cable I mean [22:35]
mercutiois it server?
all dell servers have ipmi support for serial redirection and shit at least
[22:35]
mkbso they tell me
sometimes I can do this work in a VM
[22:36]
BryceBotThat's what she said!! [22:36]
mercutioyeh that'd be easier
you coudl use vt-d?
if you need access to pci-e card
[22:36]
mkbbut you need to test with real hw interrupt timings and such
nope.. fs driver
[22:37]
mercutioahh
cool
[22:37]
mkbdifficult concurrency bugs...
and linus hasn't even yelled at us once
[22:37]

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