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tbd, if possible, detailed answers should linked to internal wiki pages
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==General==
{{#pvedocs:pve-faq-plain.html}}
===What is a container, CT, VE, Virtual Private Server, VPS?===
[[Category:Reference Documentation]]
:See [[Container and Full Virtualization]]
<pvehide>
 
New FAQs are appended to the bottom of this section.
===What is a KVM guest (KVM VM)?===
What distribution is Proxmox VE based on?
:A KVM guest or KVM VM is a guest system running virtualized under Proxmox VE with KVM.
Proxmox VE is based on Debian GNU/Linux
 
What license does the Proxmox VE project use?
===What is a Virtual Appliance?===
Proxmox VE code is licensed under the GNU Affero General Public License,
:See [[Overview]]
version 3.
==Installation and upgrade==
Will Proxmox VE run on a 32bit processor?
 
Proxmox VE works only on 64-bit CPUs (AMD or Intel). There is no plan
===Where can I find installation instructions?===
for 32-bit for the platform.
:See [[Installation]]
VMs and Containers can be both 32-bit and 64-bit.
 
Does my CPU support virtualization?
===Proxmox VE command line tools===
To check if your CPU is virtualization compatible, check for the vmx
:See [[Command line tools]]
or svm tag in this command output:
 
egrep '(vmx|svm)' /proc/cpuinfo
==Hardware==
Supported Intel CPUs
===CPU===
64-bit processors with
====Will Proxmox VE run on a 32bit processor?====
Intel
:Proxmox VE works only on 64-bit CPU´s (AMD or Intel). There is no plan for 32-bit for the platform.
Virtualization Technology (Intel VT-x) support.
===Supported CPU chips===
(List of processors with Intel VT and 64-bit)
====Intel====
Supported AMD CPUs
* [[Media:Intel-VT-LG775.jpg|Intel VT - LG775 chips]]
64-bit processors with
 
AMD
====AMD====
Virtualization Technology (AMD-V) support.
 
What is a container/virtual environment (VE)/virtual private server (VPS)?
 
In the context of containers, these terms all refer to the concept of
==Networking==
operating-system-level virtualization. Operating-system-level virtualization is
 
a method of virtualization, in which the kernel of an operating system
===How do I configure bridged networking in an OpenVZ Ubuntu/Debian container?===
allows for multiple isolated instances, that all share the kernel. When
<ol>
referring to LXC, we call such instances containers. Because containers use the
<li>In the web gui under Virtual Machine configuration got to the network tab.
host&#8217;s kernel rather than emulating a full operating system, they require less
<li>Remove the ip address for venet and save. (Bridged Ethernet Devices will appear)
overhead, but are limited to Linux guests.
<li>SSH into your host system and enter the container you want set bridge networking for:
What is a QEMU/KVM guest (or VM)?
# vzctl enter <VMID>
A QEMU/KVM guest (or VM) is a guest system running virtualized under
<li>edit  /etc/network/interfaces using using the following format and save. (replace with settings for your network)
Proxmox VE using QEMU and the Linux KVM kernel module.
<pre>
What is QEMU?
  auto lo
QEMU is a generic and open source machine emulator and
  iface lo inet loopback
virtualizer. QEMU uses the Linux KVM kernel module to achieve near
   
native performance by executing the guest code directly on the host
  auto eth0
CPU.
  iface eth0 inet static
It is not limited to Linux guests but allows arbitrary operating systems
        address 10.0.0.17
to run.
        netmask 255.255.255.0
How long will my Proxmox VE version be supported?
        network 10.0.0.0
Proxmox VE versions are supported at least as long as the corresponding
        broadcast 10.0.0.255
Debian Version is
        gateway 10.0.0.10
oldstable. Proxmox VE uses a
</pre>
rolling release model and using the latest stable version is always
<li>Shutdown the container.
recommended.
<li>Go back to web gui and under "Bridged Ethernet Devices"  configure eth0 to vmbr0  and save. (a mac address will be automatically assigned)
  Proxmox VE Version
<li>Start the container.
  Debian Version
</ol>
  First Release
Finally check that networking is working by entering the guest and viewing the results of ifconfig
  Debian EOL
 
  Proxmox EOL
==Virtualization==
Proxmox VE 8
===Why do you recommend 32-bit guests over 64 bit guests?===
Debian 12 (Bookworm)
:64-bit makes sense only if you need greater than 4GB of memory.
2023-06
:32-bit guests use less memory in certain situations
tba
::e.g. a standard installation of apache2 on 64 bit containers consumes much more memory than on 32 bit.
tba
 
Proxmox VE 7
 
Debian 11 (Bullseye)
==Troubleshooting==
2021-07
 
2024-07
===I can't switch virtual consoles in Linux KVM guests with alt-F1, alt-F2...===
2024-07
 
Proxmox VE 6
VNC viewer does not pass some key combinations or they may be intercepted by your operating system.
Debian 10 (Buster)
 
2019-07
To send custom key combinations to the guest, go to "Monitor" in Virtual Machine Configuration for a given guest and use "sendkey" command.
2022-09
 
2022-09
For example, to switch to the third console (tty3) you would use:
Proxmox VE 5
 
Debian 9 (Stretch)
sendkey alt-f3
2017-07
 
2020-07
 
2020-07
===How can I send sysrq to Linux KVM guests?===
Proxmox VE 4
 
Debian 8 (Jessie)
Similarly to the above, go to "Monitor" in Virtual Machine Configuration for a given guest and use "sendkey" command.
2015-10
 
2018-06
For example, to issue "Emergency Sync", you would use:
2018-06
 
Proxmox VE 3
sendkey alt-sysrq-s
Debian 7 (Wheezy)
 
2013-05
In the VNC viewer for the given guest you should see:
2016-04
 
2017-02
SysRq : Emergency Sync
Proxmox VE 2
 
Debian 6 (Squeeze)
You should also see this entry if you run "dmesg" on this guest.
2012-04
 
2014-05
See also http://en.wikipedia.org/wiki/Magic_SysRq_key for a full reference of possible combinations.
2014-05
 
Proxmox VE 1
 
Debian 5 (Lenny)
===How can I access Linux guests through a serial console?===
2008-10
 
2012-03
Sometimes, it is necessary to access the guest through a serial console:
2013-01
* you lost network access to the guest and VNC is either too slow for you or don't have the features you need (i.e. easy copy/paste between other terminals)
How can I upgrade Proxmox VE to the next point release?
* your guest freezes or kernel panics, you want to debug it, but it's impossible to capture all messages on VNC screen
Minor version upgrades, for example upgrading from Proxmox VE in version 7.1
* you are familiar with <code>xm console <guest></code> from Xen and you want to use a similar feature here
to 7.2 or 7.3, can be done just like any normal update.
 
But you should still check the release notes
 
for any relevant noteable, or breaking change.
The necessary steps are:
For the update itself use either the Web UI Node &#8594; Updates panel or
* on Proxmox VE host, in guest's configuration file in <code>/etc/qemu-server/<VMID>.conf</code> add:
through the CLI with:
 
apt update
args: -serial unix:/var/run/qemu-server/<VMID>.serial,server,nowait
apt full-upgrade
 
Always ensure you correctly setup the
This will open console in <code>/var/run/qemu-server/<VMID>.serial</code> socket file, which can be accessed by minicom or other serial communication program.
package repositories and only
 
continue with the actual upgrade if apt update did not hit any error.
An alternative is to add:
How can I upgrade Proxmox VE to the next major release?
 
Major version upgrades, for example going from Proxmox VE 4.4 to 5.0, are also
args: -serial tcp:localhost:6000,server,nowait
supported.
 
They must be carefully planned and tested and should never be started without
With this, you can connect to guest's serial console with telnet. Note that with telnet, any passwords will be visible on the screen.
having a current backup ready.
 
Although the specific upgrade steps depend on your respective setup, we provide
 
general instructions and advice of how a upgrade should be performed:
* on guest, in /etc/inittab, look for lines similar to the ones below and make sure you have "ttyS0" there - this would be your serial console:
Upgrade from Proxmox VE 7 to 8
 
Upgrade from Proxmox VE 6 to 7
5:2345:respawn:/sbin/mingetty tty5
Upgrade from Proxmox VE 5 to 6
6:2345:respawn:/sbin/mingetty ttyS0
Upgrade from Proxmox VE 4 to 5
 
Upgrade from Proxmox VE 3 to 4
If you want kernel messages to be shown on both serial and VGA consoles, you have to add a kernel parameter in your bootloader's configuration. For grub, it would be these "console" entries:
LXC vs LXD vs Proxmox Containers vs Docker
 
LXC is a userspace interface for the Linux kernel containment
kernel (hd0,0)/boot/vmlinuz root=LABEL=guest-root console=ttyS0 console=tty0
features. Through a powerful API and simple tools, it lets Linux users
 
easily create and manage system containers. LXC, as well as the former
 
OpenVZ, aims at system virtualization. Thus, it allows you to run a
To access the guest from minicom, configure it to use a path such as <code>unix#/var/run/qemu-server/<VMID>.serial</code> in "cOnfigure Minicom -> Serial port setup -> Serial Device".
complete OS inside a container, where you log in using ssh, add users,
 
run apache, etc&#8230;
 
LXD is built on top of LXC to provide a new, better user
To use multiple minicom configurations for several guests, create a file like /etc/minicom/minirc.someguest for each of your guests, with contents:
experience. Under the hood, LXD uses LXC through liblxc and its Go
 
binding to create and manage the containers. It&#8217;s basically an
pu port            unix#/var/run/qemu-server/<VMID>.serial
alternative to LXC&#8217;s tools and distribution template system with the
pu minit
added features that come from being controllable over the network.
pu mreset
Proxmox Containers are how we refer to containers that are created and managed
 
using the Proxmox Container Toolkit (pct). They also target system
 
virtualization and use LXC as the basis of the container offering. The
Then, start the console with:
Proxmox Container Toolkit (pct) is tightly coupled with Proxmox VE. This means
 
that it is aware of cluster setups, and it can use the same network
minicom someguest
and storage resources as QEMU virtual machines (VMs). You can even use the
 
Proxmox VE firewall, create and restore backups, or manage containers using
 
the HA framework. Everything can be controlled over the network using
See also http://www.proxmox.com/forum/showthread.php?p=5615
the Proxmox VE API.
 
Docker aims at running a single application in an isolated, self-contained
===How can I assign a physical disk to a VM?===
environment. These are generally referred to as &#8220;Application Containers&#8221;, rather
Add it first in the web interface, then use:
than &#8220;System Containers&#8221;. You manage a Docker instance from the host, using the
qm set <vmid> -ide# /dev/sdb
Docker Engine command-line interface. It is not recommended to run docker
Or:
directly on your Proxmox VE host.
qm set <vmid> -ide# /dev/disk/by-id/[your disk ID]
If you want to run application containers, for example, Docker images, it
 
is best to run them inside a Proxmox QEMU VM.
...since having the drive letter change (should you add a drive) might have unintended consequences.
</pvehide>
 
<!--PVE_IMPORT_END_MARKER-->
Also see /etc/qemu-server/<vmid>.conf
 
===How can I assign a physical disk to a CT?===
See http://wiki.openvz.org/Bind_mounts

Latest revision as of 14:11, 23 November 2023

Note New FAQs are appended to the bottom of this section.

  1. What distribution is Proxmox VE based on?

    Proxmox VE is based on Debian GNU/Linux

  2. What license does the Proxmox VE project use?

    Proxmox VE code is licensed under the GNU Affero General Public License, version 3.

  3. Will Proxmox VE run on a 32bit processor?

    Proxmox VE works only on 64-bit CPUs (AMD or Intel). There is no plan for 32-bit for the platform.

    Note VMs and Containers can be both 32-bit and 64-bit.

  4. Does my CPU support virtualization?

    To check if your CPU is virtualization compatible, check for the vmx or svm tag in this command output: 

    egrep '(vmx|svm)' /proc/cpuinfo

  5. Supported Intel CPUs

    64-bit processors with Intel Virtualization Technology (Intel VT-x) support. (List of processors with Intel VT and 64-bit)

  6. Supported AMD CPUs

    64-bit processors with AMD Virtualization Technology (AMD-V) support.

  7. What is a container/virtual environment (VE)/virtual private server (VPS)?

    In the context of containers, these terms all refer to the concept of operating-system-level virtualization. Operating-system-level virtualization is a method of virtualization, in which the kernel of an operating system allows for multiple isolated instances, that all share the kernel. When referring to LXC, we call such instances containers. Because containers use the host’s kernel rather than emulating a full operating system, they require less overhead, but are limited to Linux guests.

  8. What is a QEMU/KVM guest (or VM)?

    A QEMU/KVM guest (or VM) is a guest system running virtualized under Proxmox VE using QEMU and the Linux KVM kernel module.

  9. What is QEMU?

    QEMU is a generic and open source machine emulator and virtualizer. QEMU uses the Linux KVM kernel module to achieve near native performance by executing the guest code directly on the host CPU. It is not limited to Linux guests but allows arbitrary operating systems to run.

  10. How long will my Proxmox VE version be supported?

    Proxmox VE versions are supported at least as long as the corresponding Debian Version is oldstable. Proxmox VE uses a rolling release model and using the latest stable version is always recommended.

    Proxmox VE Version Debian Version First Release Debian EOL Proxmox EOL

    Proxmox VE 8

    Debian 12 (Bookworm)

    2023-06

    tba

    tba

    Proxmox VE 7

    Debian 11 (Bullseye)

    2021-07

    2024-07

    2024-07

    Proxmox VE 6

    Debian 10 (Buster)

    2019-07

    2022-09

    2022-09

    Proxmox VE 5

    Debian 9 (Stretch)

    2017-07

    2020-07

    2020-07

    Proxmox VE 4

    Debian 8 (Jessie)

    2015-10

    2018-06

    2018-06

    Proxmox VE 3

    Debian 7 (Wheezy)

    2013-05

    2016-04

    2017-02

    Proxmox VE 2

    Debian 6 (Squeeze)

    2012-04

    2014-05

    2014-05

    Proxmox VE 1

    Debian 5 (Lenny)

    2008-10

    2012-03

    2013-01

  11. How can I upgrade Proxmox VE to the next point release?

    Minor version upgrades, for example upgrading from Proxmox VE in version 7.1 to 7.2 or 7.3, can be done just like any normal update. But you should still check the release notes for any relevant notable, or breaking change.

    For the update itself use either the Web UI Node → Updates panel or through the CLI with:

    apt update
apt full-upgrade
    Note Always ensure you correctly setup the package repositories and only continue with the actual upgrade if apt update did not hit any error.

  12. How can I upgrade Proxmox VE to the next major release?

    Major version upgrades, for example going from Proxmox VE 4.4 to 5.0, are also supported. They must be carefully planned and tested and should never be started without having a current backup ready.

    Although the specific upgrade steps depend on your respective setup, we provide general instructions and advice of how a upgrade should be performed:

  13. LXC vs LXD vs Proxmox Containers vs Docker

    LXC is a userspace interface for the Linux kernel containment features. Through a powerful API and simple tools, it lets Linux users easily create and manage system containers. LXC, as well as the former OpenVZ, aims at system virtualization. Thus, it allows you to run a complete OS inside a container, where you log in using ssh, add users, run apache, etc…

    LXD is built on top of LXC to provide a new, better user experience. Under the hood, LXD uses LXC through liblxc and its Go binding to create and manage the containers. It’s basically an alternative to LXC’s tools and distribution template system with the added features that come from being controllable over the network.

    Proxmox Containers are how we refer to containers that are created and managed using the Proxmox Container Toolkit (pct). They also target system virtualization and use LXC as the basis of the container offering. The Proxmox Container Toolkit (pct) is tightly coupled with Proxmox VE. This means that it is aware of cluster setups, and it can use the same network and storage resources as QEMU virtual machines (VMs). You can even use the Proxmox VE firewall, create and restore backups, or manage containers using the HA framework. Everything can be controlled over the network using the Proxmox VE API.

    Docker aims at running a single application in an isolated, self-contained environment. These are generally referred to as “Application Containers”, rather than “System Containers”. You manage a Docker instance from the host, using the Docker Engine command-line interface. It is not recommended to run docker directly on your Proxmox VE host.

    Note If you want to run application containers, for example, Docker images, it is best to run them inside a Proxmox QEMU VM.


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