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{{tag>linux docker VM Proxmox server vnc kvm libvirt}}
======Docker Host ======
=====KVM versus Proxmox=====
I originally started using Linux KVM based VM, with QEMU and Libvirt on Ubuntu bare metal, circa 2014, this before was I was aware that Proxmox existed.  Around 2020 I moved to Debian as my preferred bare metal distribution for server and desktop, I stopped using Windows as my main home desktop around this time. When I started playing around with Docker to create my own container images I preferred use of the Alpine distribution and where necessary using the S6-rc init system.  I avoid the use of Ubuntu now as I just find some of their practices unpalatable, e.g. forced use of Snaps, requiring registration for latest package updates. Also their base server and desktop distributions came across as bloated around the time I stopped using them as my main distribution.  I see no point re-engaging with Ubuntu at this time, as many of the dissatisfaction that made me move are still there. Beside, I simply prefer Debian now, stable for servers and testing for main desktop.  I have been happily using XFCE for about 7 year now as my main desktop GUI (2024-04).

Interestingly as I understand it Proxmox uses Debian and Linux KVM VM, however they also provide a lot of additional functionally, such as nice web interface, nice VM backup, and LXC container system, as well as other functionality. 

I use nftables as my main edge router / firewall on bare metal. I could probably run this on a VM within Proxmox, but the Router hardware is not especially powerful and at this time I prefer to run the main firewall on bare metal.

I may try Proxmox in the future, there is currently no compelling reason for me to do so at this time.

My current router has an Intel N3700 CPU, maximum 8GB ram, procured in 2016, which in 2024 is becoming slow to use, but still functions well as a sub gb/s router.  I also run a VM with Docker containers for a backup Bind9 DNS and backup Kea DHCP on this machine.  As my upstream (WAN) internet speed is about 265Mb/s down and 23Mb/s up this router is still suitable for purpose. I suspect it will not be limiting until the available WAN speeds are above 1000Mbps. <fs small>(I am currently 2023/2024 eyeing an Intel i5-1335U or N305 as a possible replacement, this is much fast overall and should easily handle multi Gb/s internet traffic, as well as more complex resource intensive Docker instances.)</fs>  Sadly the N3700 AS2400 BMS seem to be unreliable now. I can only login to the BMS after a long shutdown and the machine often fails to reboot reliably.  Due to the age of the hardware it is not worth the cost to repair.  I will need to get a replacement soon.

My main home server is based upon an Intel Atom C3750 server, this is still currently adequately meeting my needs. I have upgraded with a 2.5Gb/s PCIe card.  I have not been able to find a good replacement for this machine at this time.  It was designed as a server, again an i5-1335U is in many ways superior, CPU cores and threads, CPU and memory speed and bandwidth, however memory is not ECC and memory is limited to 64GB, neither of which is probably a problem for me, as I am currently only using 32GB. Power consumption is similar. The biggest problem is that I have not been able to date find an i5-1335U motherboard with 4+ SATA ports and PCIE expansion slot, most are laptop boards, router boards or industrial embedded type boards that do not have the functionality that I am after.  I also still operate an older Intel Atom C2750 as a back-up server. This gets started by the main server once a week to run a Restic back-up with a Python script I wrote.


=====Setup VM=====
I use Linux KVM with libvirt, virsh and qemu.
  * Install standard Debian files. See [[https://wiki.kptree.net/doku.php?id=home_server:home_server_setup:kvm&s[]=libvirt#kvm_setup|kvm setup]]
    * I simply do not need a GUI. Where convenient I may separately install a GUI that can be accessed via VNC.
  * Add user to libvirt and libvirt-qemu, e.g. ''sudo usermod -a -G libvirt-qemu baumkp''
  * If you are ssh'ing into the host machine remember to add the ssh key to allow password-less login.  e.g. ''ssh-copy-id 192.168.1.21'' from the host machined where ''192.168.1.21'' is the remote machine.  If you do not do this the VM installer can ask for password continuously to the point of making use non-functional.
    * The user ssh keys are stored here ''~/.ssh/known_hosts''.  If there is a problem with ssh key have a look here.  
      * Check file permission is local user
      * Delete old key in file if necessary
      * Delete whole file if necessary
  * ''sudo apt install vim'' to install vim
  * Set static ip address and a bridge network (this varies on the install type)
    * For networkd:
      * ''sudo apt install bridge-utils'' Docker will need a bridge network connection
      * ''/etc/network/interfaces'' <code bash>source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
#allow-hotplug enp1s0
#iface enp1s0 inet dhcp

auto br0
iface br0 inet static
  bridge_ports enp1s0
  address 192.168.1.2/24
  gateway 192.168.1.1         #Do not use on a router
#  dns-nameservers 192.168.1.1
  bridge_stp off  # disable Spanning Tree Protocol </code> 
  
====Reference====
  *[[https://linuxconfig.org/how-to-use-bridged-networking-with-libvirt-and-kvm|How to use bridged networking with libvirt and KVM]]

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