Docker Host

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 find it bloated and some of their practices unpalatable, e.g. forced use of Snaps, requiring registration for latest package updates. I see no point re-engaging with Ubuntu at this time, as 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 Linux 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.

As my old router became too unreliable to use circa November 2024, I have ordered a replacement. My old router tl;dr My previous router basic failed to operated reliably circa October 2024 had 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 current (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. (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.) 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.

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. tl;dr I have replaced with a i3-305 based machine, with 2x modern 2.5GB/s NICs and 2 x 10GB/s NICs, all RJ45 type with 10GB/S NICs able to operate reliably and low power at all main speeds down to 10MB/s. 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.

I use Linux KVM with libvirt, virsh and qemu.

• Install standard Debian files. See kvm setup
  • I simply do not normally need a GUI. Where convenient I may separately install a GUI that can be accessed via VNC. I often install on my main VM host, but not router host.
• 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 KVM commonly uses a bridge network connection to access the host
      • The KVM virtual machine does not necessarily need a bridge network, but does usually need a static IP address
      • Docker does not specifically require a HOST with bridge
    • /etc/network/interfaces

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 enp1s0
iface enp1s0 inet static
  address 192.168.1.2/24
  gateway 192.168.1.1         #Do not use on a router
  dns-nameservers 192.168.1.14 192.168.1.2  #Your LAN DNS server(s)

Note that Docker does not need to operate on a machine with bridge network, which affords some benefits with operating a KVM.

• How to use bridged networking with libvirt and KVM

A list of self hosted applications:

• awesome-selfhosted