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62 lines
2.9 KiB
Markdown
62 lines
2.9 KiB
Markdown
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# Local image testing with QEMU
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To build our images we use the [CoreOS-Assembler (COSA)](https://github.com/edgelesssys/constellation-coreos-assembler).
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COSA comes with support to test images locally. After building your image with `make coreos` you can run the image with `make run`.
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Our fork adds extra utility by providing scripts to run an image in QEMU with a vTPM attached, or boot multiple VMs to simulate your own local Constellation cluster.
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Begin by starting a COSA docker container
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```shell
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docker run -it --rm \
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--entrypoint bash \
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--device /dev/kvm \
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--device /dev/net/tun \
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--privileged \
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-v </path/to/constellation-image.qcow2>:/constellation-image.qcow2 \
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ghcr.io/edgelesssys/constellation-coreos-assembler
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```
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## Run a single image
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Using the `run-image` script we can launch a single VM with an attached vTPM.
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The script expects an image and a name to run. Optionally one may also provide the path to an existing state disk, if none provided a new disk will be created.
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Additionally one may configure QEMU CPU (qemu -smp flag, default=2) and memory (qemu -m flag, default=2G) settings, as well as the size of the created state disk in GB (default 2) using environment variables.
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To customize CPU settings use `CONSTELL_CPU=[[cpus=]n][,maxcpus=maxcpus][,sockets=sockets][,dies=dies][,cores=cores][,threads=threads]` \
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To customize memory settings use `CONSTELL_MEM=[size=]megs[,slots=n,maxmem=size]` \
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To customize state disk size use `CONSTELL_STATE_SIZE=n`
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Use the following command to boot a VM with 2 CPUs, 2G RAM, a 4GB state disk with the image in `/constellation/coreos.qcow2`.
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Logs and state files will be written to `/tmp/test-vm-01`.
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```shell
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sudo CONSTELL_CPU=2 CONSTELL_MEM=2G CONSTELL_STATE_SIZE=4 run-image /constellation/coreos.qcow2 test-vm-01
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```
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The command will create a network bridge and add the VM to the bridge, so the host may communicate with the guest VM, as well as allowing the VM to access the internet.
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Press <kbd>Ctrl</kbd>+<kbd>A</kbd> <kbd>X</kbd> to stop the VM, this will remove the VM from the bridge but will keep the bridge alive.
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Run the following to remove the bridge.
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```shell
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sudo delete_network_bridge br-constell-0
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```
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## Create a local cluster
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Using the `create-constellation` script we can create multiple VMs using the same image and connected in one network.
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The same environment variables as for `run-image` can be used to configure cpu, memory, and state disk size.
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Use the following command to create a cluster of 4 VMs, where each VM has 3 CPUs, 4GB RAM and a 5GB state disk.
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Logs and state files will be written to `/tmp/constellation`.
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```shell
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sudo CONSTELL_CPU=3 CONSTELL_MEM=4G CONSTELL_STATE_SIZE=5 create-constellation 4 /constellation/coreos.qcow2
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```
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The command will use the `run-image` script launch each VM in its own `tmux` session.
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View the VMs by running the following
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```shell
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sudo tmux attach -t constellation-vm-<i>
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```
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