f5c3bd5dad
Add some filtering to 55-cache-devsatck-repos to handle centos7, which actually gets setup with a DISTRO_NAME of rhel7 in devstack Update the readme file to highlight the options for building other images. "DISTRO=centos7 ./tools/build-image.sh" creates a workable centos7 qcow image with this change and a d-i-b that includes Ie24033468b78587ea87188ee1b843b26895798ff Change-Id: Ida38cba0a303ab77432d5d354f1952e00ebfa00e
61 lines
1.5 KiB
ReStructuredText
61 lines
1.5 KiB
ReStructuredText
Using diskimage-builder to build devstack-gate nodes
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In addition to being able to just download and consume images that are the
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same as what run devstack-gate, it's easy to make your own for local dev or
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testing - or just for fun.
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Install diskimage-builder
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-------------------------
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Install the dependencies:
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::
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sudo apt-get install kpartx qemu-utils curl python-yaml
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Install diskimage-builder:
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::
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sudo pip install diskimage-builder
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Build an image
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--------------
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Building an image is simple, we have a script!
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::
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DISTRO="ubuntu" bash tools/build-image.sh
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See the script for environment variables to set distribution, etc.
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You should be left with a .qcow2 image file of your selected
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distribution.
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It is a good idea to set ``TMP_DIR`` to somewhere with plenty of space
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to avoid the disappointment of a full-disk mid-way through the script
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run.
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Mounting the image
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------------------
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If you would like to examine the contents of the image, you can mount it on
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a loopback device using qemu-nbd.
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::
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sudo apt-get install qemu-utils
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sudo modprobe nbd max_part=16
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sudo mkdir -p /tmp/newimage
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sudo qemu-nbd -c /dev/nbd1 devstack-gate-precise.qcow2
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sudo mount /dev/nbd1 /tmp/newimage
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Other things
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------------
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It's a qcow2 image, so you can do tons of things with it. You can upload it
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to glance, you can boot it using kvm, and you can even copy it to a cloud
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server, replace the contents of the server with it and kexec the new kernel.
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