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meingtsla has joined #arpnetworks -: mnathani drops a pin mercutio: the world explodes. -: mercutio wonders why he touches old hardware; another computer with grub issues mercutio: this time i just get a cursor in the top left and no information :) mkb: grub2? mercutio: yip
have you seen it before? mkb: nope
but good luck getting grub2 to do anything useful mercutio: weirdly i found the fastest sata drives i've ever seen in an old server mkb: I've spent hours learning to configure it to change the damn default kernel mercutio: oh that's quite easy mkb: if you know how tell me mercutio: was 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 mkb: where? it's got like 20 config files now mercutio: in /etc/default/grub
then you update your grub mkb: how? mercutio: in 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 mkb: and it seems to be grub2-mkconfig on rhel mercutio: looks 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 :) mkb: yeah and the only docs are in random places on google unfortunately mercutio: heh mkb: make install in the kernel sources knows how to modify the config mercutio: yeah i'm not a huge fan but it tends to work ok when it works. mkb: (yes I work on the kernel but don't know how to set the default) mercutio: ahh 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 :) mkb: I think it tries to remember what you selected at the last boot prompt mercutio: yeh that used to be the case mkb: rhel is perpetually old mercutio: think people generally moved away from that
arch has #GRUB_SAVEDEFAULT="true"
but i think it defaults to false.
oh it may still save mkb: but that means I have to walk down the hall to the servers and hook everything up to toggle it mercutio: you have to set that GRUB_DEFAULT to the saved entry if you want that think.
yeah
have you got AMT? mkb: I don't have a savedefault line
we have something based on xcat
it doesn't work very well mercutio: AMT 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 :/ mkb: this thing stops and says waiting for ISOL or something 75% of the time you use it mercutio: oh
it's a proper server? mkb: oh yeah mercutio: desktops tend to boot quicker
if you're playing with kernel stuff
like my hp 6300 sff boots fast. mkb: oh that's another source of unending annoyance mercutio: yes :) mkb: I hate dell's BIOS
the damn thing stops and waits for a keypress sometimes mercutio: hahaha
i've been thinking about getting another hp 6300 mkb: we've got a monitor in the rack but it's just a little too short mercutio: they're a lot more stress free for tesing stuff hah mkb: the cable I mean mercutio: is it server?
all dell servers have ipmi support for serial redirection and shit at least mkb: so they tell me
sometimes I can do this work in a VM BryceBot: That's what she said!! mercutio: yeh that'd be easier
you coudl use vt-d?
if you need access to pci-e card mkb: but you need to test with real hw interrupt timings and such
nope.. fs driver mercutio: ahh
cool mkb: difficult concurrency bugs...
and linus hasn't even yelled at us once