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# how to create templates used by proxmox
## Configuration
* Packer must be installed on the local environment.
* If your workstation is not reachable from the proxmox cluster, you have to create a
tunnel to the internal network (documented later on this document).
* Copy the `env-template.sh` file to an `env.sh` and configure it according you needs.
## Building the template
1. Load the configuration
```source env.sh```
2. Ensure your workstation is reachable from the proxmox environment
3. Upgrade the `vm_id` value in the json file if needed (packer doesn't support
templating for int values in version 1.6.4)
4. Build the template for the desired debian distribution (e.g buster, bullseyes)
```packer build debian_{distribution}.json```
A new template is available on the node if the build succeed:
![Templates in hypervisor](doc/templates.png)
## Create a tunnel for the http server
The vm created to build the template needs to reach a webserver started by packer during
the build process in order to retrieve some elements like the preseed file or the init
scripts.
If it cannot, you can create a tunnel to expose the http server port.
By configuration, the port is forced to `8888` (`http_port_min` and `http_port_max`
properties in the packer file).
Use one of the proxmox-hypervisor (branly, pompidou, beaubourg...):
```
ssh -R :8888:127.0.0.1:8888 {proxmox-hypervisor}
```
To work the **ssh server** must be configured with the ``GatewayPorts`` properly
activated. If not, the remote port will be bound on the loopback interface only.
to check :
```
% ss -tan | grep 8888
LISTEN 0 128 127.0.0.1:8888 0.0.0.0:*
LISTEN 0 128 [::1]:8888 [::]:*
```
In this example, it is not working as the port is bound on `127.0.0.1`.
It can be solved with a a second tunnel from the hypervisor with a different port :
```
% ssh -g -L 8889:localhost:8888 localhost
```
Note the `8889` port.
```
% ss -tan | grep 8889
LISTEN 0 128 0.0.0.0:8889 0.0.0.0:*
LISTEN 0 128 [::]:8889 [::]:*
```
**Last step**, Now, Configure your `env.sh` file with the url from the hypervisor point
of view, the port must be ``8888`` for the first example, ``8889`` for the second:
`http://<hypervisor ip>:888[89]`

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