-- ColinLeavettBrown - 2015-06-22

Cloud howto: running batch jobs with HTCondor/Cloud Scheduler

  • Obtain images - three methods:
    1. Use cloud provided default images (installed as public images by sysadmins) - easiest method.
    2. Download an existing image (see OpenStack image guide, section 2):
      • Select and image and copy its' URL
      • Use the horizon "Create Image" dialog and copied URL to upload the required image to your cloud account.
    3. Create image with virt-install (and cobbler):
      1. Hardware confguration
      2. On hypervisor node:
        • create and run /root/qemu/mk-cc-demo. This will create a virtual machine with a vnc console that will fail to boot. At this point, the vnc console can be closed.
        • Issue "virsh edit cc-demo" and copy the "MAC" address.
        • Modify /root/qemu/mk-cc-demo to include the copied MAC address.
        • "virsh destroy cc-demo"
        • "virsh undefine cc-demo"
      3. On cobbler server:
        • Create a public/private ssh key: ssh-keygen -f /root/.ssh/id_rsa_cc-demo
        • Create a /var/lib/cobbler/kickstarts/cc-demo.cfg suitable to your application needs. You can create an encrypted root password following [[][these instructions]].
          • Copy your new public key to the end of your kickstart file.
        • Create /root/cobbler/add-cc-demo specifying the kickstart file and the copied MAC address. Run the shell script and then "cobbler sync"
      4. On the hypervisor node:
        • Re-run the "mk-cc-demo" shell script. This will recreate the VM with a vnc console, but this time it will boot/install.
        • After the reboot, prepare the VM for other network connections:
          • ssh login from the cobbler server: ssh -i ~/.ssh/id_rsa_cc-demo 192.168.1.11
          • /etc/sysconfig/network (no host or gateway, nozeroconf=yes)
          • /etc/sysconfig/network-scripts/ifcfg-eth0
          • /etc/inittab
          • halt
          • virsh edit cc-demo and change the network bridge to br3 (public network)
          • virsh start cc-demo (virsh start cc-demo; virt-viewer cc-demo)
        • Which public IP did it get?
          • reboot in single user mode
          • ifup eth0 and ifconfig
          • reboot
        • Log in through ssh and make any required customizations (see, OpenStack image guide, section 5):
          • yum -y update
          • yum -y install epel-release
          • yum -y install cloud-init (may complain about not having python-six)
          • Batch jobs? Need to install HTCtcondor:
          • Authenticating condor server/workers with GSI?:
          • rm -fv /etc/udev/rules.d/70-persistent-net.rules
        • shutdown the VM
        • Use the horizon "Create Image" dialog to upload the image to your cloud account.

  • Customizing images interactively on the cloud:
    • Interractive instantiation:
      • Images->Actions->Launch
      • Provide name, flavor, key pair, network - then Launch
      • Instances->actions->associate floating IP
    • Modifying an image:
      • Login as root
      • Make changes
      • Snapshot:
        • Instances->Actions->Snapshot, provide snapshot name.

  • Running batch jobs:
    • Prepare batch control files:
      • cc-demo.sh - executable
      • cc-demo.job - Job Description Language (JDL) file
      • IAAS.yaml - required VM contextualization file:
        • configuration files
          • job wrapper script
          • condor_config.local
          • condor initd script
        • Commands:
          • Set timezone
          • Establish swap space
          • Start condor
    • Submit jobs: condor_submit
    • Monitoring jobs: watch example
    • Retrieving job output:
    • Custom VM contextualization: merge-type, custom.yaml example:
      • Other files
      • Groups and users
      • Other commands
      • ssh keys
      • see cloud-init documentation
Topic attachments
I Attachment History Action Size Date Who CommentSorted ascending
PNGpng CobblerInstallVM.png r2 r1 manage 85.8 K 2015-07-06 - 19:10 UnknownUser  
Unknown file formatEXT add-cc-demo r1 manage 0.4 K 2015-07-06 - 18:17 UnknownUser  
Unknown file formatgz batch-demo.tar.gz r3 r2 r1 manage 8.9 K 2015-08-21 - 18:38 UnknownUser  
Unknown file formatcfg cc-demo.cfg r2 r1 manage 2.6 K 2015-07-06 - 19:55 UnknownUser  
Unknown file formatrepo igtf.repo r2 r1 manage 0.2 K 2015-07-29 - 20:35 UnknownUser  
Unknown file formatEXT mk-cc-demo r2 r1 manage 0.5 K 2015-07-06 - 19:12 UnknownUser  
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Topic revision: r14 - 2015-08-24 - crlb
 
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