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terraform libvirt: document usage

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Signed-off-by: Malte Poll <mp@edgeless.systems>
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Malte Poll 2022-05-24 09:57:16 +02:00 • committed by Malte Poll
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docs/local-image-testing.md
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# Local image testing with QEMU
> Note: This document describes a manual method of deploying VMs with QEMU look at [terraform/libvirt](/terraform/libvirt) for an automated alternative.
To build our images we use the [CoreOS-Assembler (COSA)](https://github.com/edgelesssys/constellation-coreos-assembler).
COSA comes with support to test images locally. After building your image with `make coreos` you can run the image with `make run`.
@ -41,21 +43,3 @@ Run the following to remove the bridge.
```shell
sudo delete_network_bridge br-constell-0
```
## Create a local cluster
Using the `create-constellation` script we can create multiple VMs using the same image and connected in one network.
The same environment variables as for `run-image` can be used to configure cpu, memory, and state disk size.
Use the following command to create a cluster of 4 VMs, where each VM has 3 CPUs, 4GB RAM and a 5GB state disk.
Logs and state files will be written to `/tmp/constellation`.
```shell
sudo CONSTELL_CPU=3 CONSTELL_MEM=4G CONSTELL_STATE_SIZE=5 create-constellation 4 /constellation/coreos.qcow2
```
The command will use the `run-image` script launch each VM in its own `tmux` session.
View the VMs by running the following
```shell
sudo tmux attach -t constellation-vm-<i>
```