The first step for DevStack inside of VirtualBox is creating the virtual machine. There are two obvious changes that you need to make and those are increasing processor count and assigned memory as high as you can afford it. The other two are a bit more "sneaky".
We really have to enable Nested VT-x/AMD-V under System, Processor and if we want to access our system we should really set network forwarding rules for port 80 (HTTP for Dashboard) and port 22 (SSH, optional but really helpful). I usually set them to be 56080 and 56022 respectively under my localhost but the actual numbers can be of your choosing. And yes, there are other ways to setup networking but NAT with forwarding is mine.
With the virtual machine set, the next step toward DevStack is installing OS. While official guidelines prefer Ubuntu 18.04, I like to go with a slightly newer Ubuntu 20.04 Server. Whole installation is essentially one big click-next event with the only non-default part being installation of OpenSSH.
Once OS is installed, I also like to add my user to password-less sudoers and do any needed updates:
echo "$USER ALL=(ALL) NOPASSWD: ALL" | sudo tee /etc/sudoers.d/$USER
sudo apt update
sudo apt dist-upgrade --yes
And now finally we can follow the DevStack instructions with customized host IP (otherwise you'll get "
Could not determine host ip address" error) and admin password.
sudo useradd -s /bin/bash -d /opt/stack -m stack
echo "stack ALL=(ALL) NOPASSWD: ALL" | sudo tee /etc/sudoers.d/stack
sudo su - stack
git clone https://github.com/openstack-dev/devstack.git -b $STACK_BRANCH devstack/
cp samples/local.conf .
sed -i 's/#HOST_IP=w.x.y.z/HOST_IP=10.0.2.15/' local.conf
sed -i 's/ADMIN_PASSWORD=nomoresecret/ADMIN_PASSWORD=devstack/' local.conf
echo "#Enable heat services" >> local.conf
echo "enable_service h-eng h-api h-api-cfn h-api-cw" >> local.conf
echo "#Enable heat plugin" >> local.conf
echo "enable_plugin heat https://git.openstack.org/openstack/heat $STACK_BRANCH" >> local.conf
Once done, GUI is available at http://localhost:56080/dashboard/.