Docker Container support for instack-virt-setup
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James Slagle
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docker/README.md
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docker/README.md
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Instack Docker Setup
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====================
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The instack Docker setup provides an environment equivalent to that produced by
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running instack-virt-setup in a reuseable Docker container.
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Running the instack-virt-setup Docker image
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-------------------------------------------
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Pull the image from the docker registry.
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docker pull slagle/instack-virt-setup
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Run the image. The container must be started with --privileged so that libvirt
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has access to create networks. A host path must also be mounted into the
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container at /var/lib/libvirt/images for the instack vm's to use to write their
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disks to. This is required because Docker containers are currently limited to
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10 GB of disk usage, and this will quickly get used up if the vm disks are
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written inside the container directly. In the command below I'm using
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/storage/docker/lib, but any host path with at least 30 GB free should do.
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docker run \
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-it \
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--name instack-virt-setup \
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--privileged \
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--volume /storage/docker/lib:/var/lib/libvirt/images \
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slagle/instack-virt-setup
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Building the instack-virt-setup Docker image
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--------------------------------------------
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Building the docker image is a multi-step process. There is a Dockerfile to
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help with building the initial image. A container must then be started using
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that image, modified, and then committed to a new final image.
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1. Build a qcow2 disk image for the instack undercloud vm
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UNDERCLOUD_ROOT_PASSWORD=${UNDERCLOUD_ROOT_PASSWORD:-""}
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UNDERCLOUD_PASSWORD_ARG=
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if [ $UNDERCLOUD_ROOT_PASSWORD ]; then
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UNDERCLOUD_PASSWORD_ARG="--root-password password:$UNDERCLOUD_ROOT_PASSWORD"
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fi
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export UNDERCLOUD_VM_NAME=${UNDERCLOUD_VM_NAME:-"instack"}
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virt-builder fedora-20 $UNDERCLOUD_PASSWORD_ARG \
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--size 30G \
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--format qcow2 \
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-o $UNDERCLOUD_VM_NAME.qcow2 \
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--install net-tools,yum-utils,git \
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--firstboot-command \
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'useradd -m -G wheel -p "" stack ; echo "stack:stack" | chpasswd' \
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--firstboot-command \
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'echo "stack ALL=(root) NOPASSWD:ALL" >> /etc/sudoers.d/stack ; chmod 0440 /etc/sudoers.d/stack'
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# Run image through virt-sparsify
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virt-sparsify instack.qcow2 instack.qcow2.new
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mv instack.qcow2.new instack.qcow2
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1. Make sure you have the fedora Docker image pulled
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docker pull fedora
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1. Build the initial image
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cd instack-undercloud/docker/instack-virt
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docker build -t instack-virt .
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1. Start a container based on that image
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docker run -it --name instack-virt --privileged instack-virt
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1. ssh as root to the container, then do the following steps:
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mkdir /var/lib/libvirt/base-images
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su - stack
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# The following are the same steps from instack-virt-setup, with the call to
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# virt-builder removed. We should just update that script to make that
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# call optional.
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source /usr/libexec/openstack-tripleo/devtest_variables.sh
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export NODE_ARCH=${NODE_ARCH:-amd64}
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tripleo devtest_testenv.sh instackenv.json
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sudo virsh undefine --remove-all-storage seed
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UNDERCLOUD_ROOT_PASSWORD=${UNDERCLOUD_ROOT_PASSWORD:-""}
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UNDERCLOUD_PASSWORD_ARG=
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if [ $UNDERCLOUD_ROOT_PASSWORD ]; then
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UNDERCLOUD_PASSWORD_ARG="--root-password password:$UNDERCLOUD_ROOT_PASSWORD"
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fi
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export UNDERCLOUD_VM_NAME=${UNDERCLOUD_VM_NAME:-"instack"}
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tripleo configure-vm \
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--name $UNDERCLOUD_VM_NAME \
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--image /var/lib/libvirt/images/$UNDERCLOUD_VM_NAME.qcow2 \
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--seed \
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--libvirt-nic-driver virtio \
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--arch x86_64 \
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--memory 2097152 \
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--cpus 1
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1. Still ssh'd as root to the container, vi /start.sh and replace its contents
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with the following:
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#!/bin/bash
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for i in $(seq 0 4); do
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if [ ! -f /var/lib/libvirt/images/baremetal_$i.qcow2 ]; then
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qemu-img create -f qcow2 /var/lib/libvirt/images/baremetal_$i.qcow2 31G
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fi
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done
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if [ ! -f /var/lib/libvirt/images/instack.qcow2 ]; then
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qemu-img create -f qcow2 -b /var/lib/libvirt/base-images/instack.qcow2 /var/lib/libvirt/images/instack.qcow2
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fi
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/usr/share/openvswitch/scripts/ovs-ctl start --system-id=random
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supervisord -n
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1. Back on the docker host, copy the created instack.qcow2 into the
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/var/lib/libvirt/base-images directory in the container.
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1. Back on the docker host, stop the container
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docker stop instack-virt
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1. Commit the container to a new image
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docker commit instack-virt-setup instack-virt
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40
docker/instack-virt/Dockerfile
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40
docker/instack-virt/Dockerfile
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FROM fedora
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MAINTAINER James Slagle <slagle@redhat.com>
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RUN yum -y install supervisor
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RUN yum -y install openssh-server
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RUN echo root | passwd --stdin root
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EXPOSE 22
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COPY sshd.ini /etc/supervisord.d/sshd.ini
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RUN ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key -N ''
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RUN yum -y install libvirt libvirt-daemon-kvm
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COPY libvirtd.ini /etc/supervisord.d/libvirtd.ini
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RUN yum -y install openvswitch
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COPY start.sh /start.sh
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RUN chmod 0755 /start.sh
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CMD /start.sh
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RUN useradd stack
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RUN echo stack | passwd --stdin stack
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RUN echo "stack ALL=(root) NOPASSWD:ALL" > /etc/sudoers.d/stack
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RUN chmod 0440 /etc/sudoers.d/stack
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RUN echo 'export LIBVIRT_DEFAULT_URI="qemu:///system"' >> /home/stack/.bashrc
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RUN yum install -y http://rdo.fedorapeople.org/openstack-icehouse/rdo-release-icehouse.rpm
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RUN yum install -y instack-undercloud
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RUN yum install -y libguestfs-tools
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RUN groupadd libvirtd
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RUN usermod -a -G libvirtd stack
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RUN sed -i "s/^#unix_sock_group.*/unix_sock_group = \"libvirtd\"/g" /etc/libvirt/libvirtd.conf; \
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sed -i 's/^#auth_unix_rw.*/auth_unix_rw = "none"/g' /etc/libvirt/libvirtd.conf; \
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sed -i 's/^#unix_sock_rw_perms.*/unix_sock_rw_perms = "0770"/g' /etc/libvirt/libvirtd.conf
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RUN yum -y install libvirt-python
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RUN yum clean all
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2
docker/instack-virt/libvirtd.ini
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2
docker/instack-virt/libvirtd.ini
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[program:libvirtd]
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command=/usr/sbin/libvirtd
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2
docker/instack-virt/sshd.ini
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2
docker/instack-virt/sshd.ini
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[program:sshd]
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command=/usr/sbin/sshd -D
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4
docker/instack-virt/start.sh
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4
docker/instack-virt/start.sh
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#!/bin/bash
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/usr/share/openvswitch/scripts/ovs-ctl start --system-id=random
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supervisord -n
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