Archive for October, 2011

Xen 4.1.2 on Fedora 16 Beta – My experience

Duplicate of my mail to the Xen-users list:

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Stupid Trick: Changing the UUID in /etc/fstab from an emergency shell with screen

So. I installed a new VM with /boot formatted as btrfs. Except pygrub apparently doesn’t like btrfs, so it refused to boot. And I refused to reinstall. So it looked like an impasse – I didn’t want to mess around with chroots and installing grub2, but it couldn’t boot without said messing around. And then […]

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Revised Fedora virt-install command

I got tired of having to muck around with kpartx and such whenever a domU went down. So I decided to just go with 4 LVs per domU – root, home, swap and boot. The command to create the LVs is just one really long one, the original command replicated 4 times: lvcreate -L10G -n […]

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Why I’m becoming increasingly disillusioned with SELinux

My history with SELinux is a… varied one. I first remember using it back in Fedora Core 6. I soon gave up on it, the labeling wasn’t consistent and I didn’t have the time nor inclination to relabel everything, especially when a quick one work change in a config file fixed all my problems. The […]

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Win2K8R2 as HVM VM on Xen 4.1

Config file: pastebin.com/ULE1Y49R Also, it’s working fine without the Xen extensions, though there’s (at least) one unknown device in the device manager)

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Sudo broken on F16?

I haven’t been able to use sudo on F16Beta on both machines that I upgraded – even though I know sudo worked fine before I upgraded. Not sure why/how it broke… Turns out SELinux broke it somehow.

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SELinux, Xen & LVMs

I discovered something new today: SELinux can and does prevent access to logical volumes. This is entirely unexpected for me, because I always thought SELinux only worked on files. I was wondering why my test VM suddenly refused to start with the error “Disk is not accessible” after I upgraded it to F16Beta. I checked […]

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Xen documentation

I read a most interesting post on the Xen-users list today: lists.xensource.com/archives/html/xen-users/2011-10/msg00350.html I’m going to try to follow these suggested topics. I mean, I got Win2k8R2 running on Xen, and I’m running Xen on F16Beta,┬áneither of which I see documented anywhere,┬áso that’s surely something I can contribute to the community docs…

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Networking upgrade from Xen 4.0 to 4.1

I believe that Xen 4.1 saw the rewrite of what I’m assuming is the entire network configuration stack. Perhaps the most significant thing for me was that the domU’s network connection isn’t created/initiated properly if the domU config file has anything other than the MAC address and the bridge to which to attach the vif […]

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Scheduling stuff to happen at reboots in Linux

Problem: My 1U is throwing correctable memory errors every few seconds, but I can’t do much about it, so I’m ignoring it. Solution: Disable the log messages about correctable memory errors. For future reference, the command is echo 0 > /sys/module/edac_core/parameters/edac_mc_log_ce Problem: I don’t want to have to do that after every reboot! Solution: Use […]

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