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homeassistant-proxmox-host-ssh.md

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Introduction

I wanted to use Homeassistant to execute scripts on my Proxmox host. In the past i did this through setting up SSH-connection by logging in as the root. I searched for an alternative solution which would work without SSH. I though something like a rest-api for triggering scripts would exist. And indeed those solutions did exist, but no common-used-solution that everybody is using. This common-used-solution seem to be "SSH". So eventually i chose to use SSH.

Creating the "Homeassistant" user on the Proxmox host

  1. Open a Shell on Proxmox via the Web-gui
  2. Create the user “homeassistant” with: useradd --shell /usr/bash --create-home homeassistant

Enable the "Homeassistant" user in Proxmox

  1. Navigate in the Proxmox GUI to the "Server View" > “Datacenter”
  2. Navigate to “Permissions” > “Users”
  3. Click “Add”
  4. Give "Username": homeassistant
  5. Ensure "Realm": Linux PAM standard authentication
  6. Ensure "Enabled": Checked
  7. Click the button to create the user
  8. Select the user homeassistant
  9. Choose the button "Password"
  10. Enter a password

Generate keypair and provide to remote host

  1. Open "Homeassistant"
  2. Install the "SSH-addon"
  3. Configure the "SSH-addon" to accept a password by providing a password
  4. Configure the "SSH-addon" to work on port: 22
  5. Start the SSH-addon
  6. Choose the the button "OPEN WEB-UI"
  7. In the console crreate directory: mkdir -p /config/key/
  8. Generate keypair: ssh-keygen -t rsa -b 4096 -f /config/key/id_rsa
  9. Copy the public key to the Proxmox-host: ssh-copy-id -i /config/key/id_rsa.pub homeassistant@192.168.178.2 (192.168.178.2 is the IP# of my Proxmox-host)
  10. Accept the fingerprint of the remote host (SSH addon)
  11. Enter the password of the user “homeassistant” you created on the Proxmox-host

(Optional) Allow Homeassistant to run ryzenadj

In the shell of the Proxmox-host as the root user:

  1. Create a usegroup which can run "ryzenadj": groupadd ryzenadj
  2. Make the user "homeassistant" member of the usergroup: usermod -aG ryzenadj homeassistant
  3. Create a sudoers-file to allow for running "ryzenadj" with "sudo" without requiring a password: nano /etc/sudoers.d/ryzenadj
  4. Put in this file:
## Members of the ryzenadj group may gain some privileges
%ryzenadj ALL=(ALL) NOPASSWD: /usr/local/bin/ryzenadj

I installed the remote command line integration via HACS. In homeassistant add this yaml:

remote_command_line:
  tdp_low:
    ssh_user: homeassistant
    ssh_host: 192.168.178.2          < IP# of my Proxmox host
    ssh_key: /config/key/id_rsa
    command_timeout: 10
    command: "sudo ./ryzenadj --stapm-limit=1000 --fast-limit=1000 --slow-limit=1000 --tctl-temp=90 --power-saving > /dev/null"

  tdp_high:
    ssh_user: homeassistant
    ssh_host: 192.168.178.2
    ssh_key: /config/key/id_rsa      < IP# of my Proxmox host
    command_timeout: 10
    command: "sudo ./ryzenadj --stapm-limit=45000 --fast-limit=45000 --slow-limit=45000 --tctl-temp=90 --max-performance > /dev/null"