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Author Archives: s3hh
Easily making a blockdev available to a container
Often it would be nice to mount an existing (lvm) block device into a container. For instance, to emulate an Amazon ec2 environment, I’d like to have /dev/vdb or /dev/xvdb as a block device. So I wrote a mount hook … Continue reading
ecryptfs-backed containers
During this cycle, the lxc package gained the ability to call ‘hooks’ at various points of a container’s life cycle. Just today, a new hook point was added to the quantal package, which supports a simple use of ecryptfs backed … Continue reading
Playing with seccomp
Seccomp is a linux kernel feature by Andrea Arcangeli which limits the system calls which a task can use, by allowing a task to say “from now on, msyelf and my new children should not be able to do anything … Continue reading
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Crypto tutorial
One of the first real web pages I put up was a small set of tutorials on how basic crypto algorithms work. This was back in the days (mid 90s) when people actually tended to sit down and roll their … Continue reading
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Connecting containers on several hosts with Open vSwitch
Lxc is great for starting up several containers on your laptop or on an ec2 host. But what if you want to fire up containers on multiple ec2 instances, and have them talk to each other? An easy way to … Continue reading
User namespaces – available to play!
Over the past few months, Eric Biederman has been working on completing the user namespace. Briefly, unprivileged users can create a user namespace, where he can pretend to be root and start new namespaces (i.e. network and pid) which he … Continue reading
LXC in precise and beyond
I haven’t blogged about lxc for some time. Recently Stéphane showed ( http://www.stgraber.org/2012/03/04/booting-an-ubuntu-12-04-virtual-machine-in-an-lxc-container/) what much of the lxc related work we did this cycle accomplished: making it possible to boot a stock ubuntu image in a container, and streamlining the … Continue reading
First round of kvm performance tests
Here are the raw results from my first set of kvm performance runs. These were all using disk images on an ext4 filesystem on the host, and using the scripts I showed in the previous post. To reiterate: for each … Continue reading
Kvm performance runs under way
I’ve finally gotten the kvm performance tests rolling. I’m hoping to have the first set of results some time next week. I installed a new precise server image on a laptop with 100M for rootfs (ext4), and a 100M partition … Continue reading
The linux command line (book)
“The linux command line”, published by the No Starch Press, sells itself to people who are new to linux, and have been enjoying its gui goodness, but who now want to experience some of the famed power of the command … Continue reading
