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Install troubleshooting with ssh #392

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b8aed59
Fix confusing wording about installation logs
ydirson Sep 24, 2025
e90cb48
Document how to access the installer using ssh
ydirson Sep 24, 2025
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32 changes: 30 additions & 2 deletions docs/troubleshooting/installation-upgrade.md
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Expand Up @@ -29,6 +29,34 @@ When asking for help about installation errors, providing this file increases yo

The target installation partition is mounted in `/tmp/root`.

### Getting remote access to host during installation

While the console access method described above may be sufficient for simple issues, collecting full logs (install logs, kernel logs, etc.) often requires copying large amounts of data, which is impractical without direct file access.

To enable SSH/SCP access during installation, you can use the Linux kernel command line to:

- Activate the network
- Enable the sshd service with a root password of your choice

For the most common case (setting up the network via DHCP), add the following parameters to the Linux boot section:

```
network_device=all sshpassword=YOURCHOICE
```

You can also use the `network_config` parameter (which defaults to `dhcp`) to define an alternative network setup. Below are some template examples — just replace the capitalized values with your actual settings. Optional parameters are marked with square brackets (`[]`).

```
network_config=dhcp[:vlan=VLAN]
network_config=static:ip=IP;netmask=NETMASK[;gateway=GW][;dns=DNS1[,DNS2]][;domain=DOMAIN][;vlan=VLAN]
```

:::note
You can specify an interface name such as `eth1` instead of `all` if necessary, which can be useful when you need to setup a static IP address.
:::

The ssh server will be available once the network is up. If you are unsure which DHCP address was obtained, you can use the shell console as described above to look it up using `ip a`. You can then connect as `root` using the password you provided on the commandline.

## The ISO installer does not offer to upgrade the existing install (XCP-ng or XenServer)

:::note
Expand Down Expand Up @@ -64,10 +92,10 @@ On the host, run `efibootmgr`.

## Installation logs

The installer writes in `/var/log/installer/`.
On the installed system, installer logs are kept in `/var/log/installer/`.

The main log file is `/var/log/installer/install-log`.

## Debugging the installer

You can [build your own installer](../../project/development-process/ISO-modification).
You can [build your own installer](../../project/development-process/ISO-modification).