Docker and HTCondor - University of Wisconsin–Madison
[Pages:49]Docker and HTCondor
Greg Thain HTCondor Week 2015
Start with the Basics...
HTCondor is designed to: Allow a machine "owner" to loan it out The machine must be protected from job
Ancient History: Chroot
HTCondor used to chroot every job: 1. No job could touch the file system 2. Private files in host machine stayed private
Chroot: more trouble than value
Increasingly difficult to work: Shared libraries /dev /sys /etc /var/run pipes for syslog, etc.
How to create root filesystem?
Easier now with yum, apt get, etc., but still hard:
Repos make images Easier*
$ dnf -y --releasever=21 ?nogpg installroot=/srv/mycontainer --disablerepo='*' --enablerepo=fedora install systemd passwd dnf fedora-release vim-minimal
$ debootstrap --arch=amd64 unstable ~/debiantree/
$ pacstrap -c -d ~/arch-tree/ base
We gave up!
HTCondor no longer chroots all jobs But you can optionally do so. Very few site sites do... NAMED_CHROOT = /foo
Enter Docker!
This is Docker
Docker manages Linux containers.
Containers give Linux processes a private:
? Root file system ? Process space ? NATed network ? UID space
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