a6d4fae070
Update the sshd_config on our test nodes to accomodate what appears to be an increase in ssh scanner traffic. In particular LoginGraceTime defaults to 120 seconds. We reduce that to 30 seconds to cycle connections more quickly. Then we also increase the maximum number of connection startups to 30 from the default of 10. We also reduce the random fail rate from 30% to 10% between 31 and 100 connections. I'm not entirely certain this will fix things, but based on what we've seen from logs it may be what we need to make ssh to test nodes more reliable. Change-Id: Ifacf7d00de157ab2fb60cde990f0b49f03f71415 |
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|---|---|---|
| .. | ||
| cache-devstack | ||
| control-plane-minimal | ||
| infra-package-needs | ||
| initialize-urandom | ||
| nodepool-base | ||
| openstack-repos | ||
| zuul-worker | ||
| bindep-fallback.txt | ||
| README.rst | ||
Using diskimage-builder to build devstack-gate nodes
In addition to being able to just download and consume images that are the same as what run devstack-gate, it's easy to make your own for local dev or testing - or just for fun.
Install diskimage-builder
Install the dependencies:
sudo apt-get install kpartx qemu-utils curl python-yaml debootstrapInstall diskimage-builder:
sudo -H pip install diskimage-builderBuild an image
Building an image is simple, we have a script!
bash tools/build-image.shSee the script for environment variables to set distribution, etc. By default it builds an ubuntu-minimal based image. You should be left with a .qcow2 image file of your selected distribution.
Infra uses the -minimal build type for building Ubuntu/CentOS/Fedora. For example: ubuntu-minimal.
It is a good idea to set TMP_DIR to somewhere with
plenty of space to avoid the disappointment of a full-disk mid-way
through the script run.
While testing, consider exporting DIB_OFFLINE=true, to skip updating the cache.
Mounting the image
If you would like to examine the contents of the image, you can mount it on a loopback device using qemu-nbd.
sudo apt-get install qemu-utils
sudo modprobe nbd max_part=16
sudo mkdir -p /tmp/newimage
sudo qemu-nbd -c /dev/nbd1 /path/to/devstack-gate-precise.qcow2
sudo mount /dev/nbd1p1 /tmp/newimageor use the scripts
sudo apt-get install qemu-utils
sudo modprobe nbd max_part=16
sudo tools/mount-image.sh devstack-gate-precise.qcow2
sudo tools/umount-image.shOther things
It's a qcow2 image, so you can do tons of things with it. You can upload it to glance, you can boot it using kvm, and you can even copy it to a cloud server, replace the contents of the server with it and kexec the new kernel.