---
name: "lxc-update-config"
section: "1"
platform: "linux"
package: "lxc"
version: "1:7.0.0-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/lxc-update-config"
---

# lxc-update-config(1)

update a legacy pre LXC 2.1 configuration file

## NAME

lxc-update-config - update a legacy pre LXC 2.1 configuration file

## SYNOPSIS

**lxc-update-config**  {-c *config*}

## DESCRIPTION

**lxc-update-config** detects any legacy configuration keys in the given *config* file and will replace them with the appropriate new configuration keys.

**lxc-update-config** will first create a backup of the old *config* file in the same directory and name it *config.backup* and then update the original *config* file in place. In case the update fails to apply or leads to an invalid *config* file that cannot be used to start a container users can either compare *config* with *config.backup* and try to manually repair any the invalid configuration keys or simply rollback to the legacy configuration file by copying *config.backup* to *config*.

Any failures for **lxc-update-config** to generate a useable *config* file are a bug and should be reported upstream.

## OPTIONS

- FC**-c, --config**F\[0\]

  Path to the configuration file to update.

- FC**-h, --help**F\[0\]

  ## SEE ALSO

[**lxc**(7)](/lxc/7.md), [**lxc-create**(1)](/lxc-create/1.md), [**lxc-copy**(1)](/lxc-copy/1.md), [**lxc-destroy**(1)](/lxc-destroy/1.md), [**lxc-start**(1)](/lxc-start/1.md), [**lxc-stop**(1)](/lxc-stop/1.md), [**lxc-execute**(1)](/lxc-execute/1.md), [**lxc-console**(1)](/lxc-console/1.md), [**lxc-monitor**(1)](/lxc-monitor/1.md), [**lxc-wait**(1)](/lxc-wait/1.md), [**lxc-cgroup**(1)](/lxc-cgroup/1.md), [**lxc-ls**(1)](/lxc-ls/1.md), [**lxc-info**(1)](/lxc-info/1.md), [**lxc-freeze**(1)](/lxc-freeze/1.md), [**lxc-unfreeze**(1)](/lxc-unfreeze/1.md), [**lxc-attach**(1)](/lxc-attach/1.md), [**lxc.conf**(5)](/lxc.conf/5.md)