Skip to content

nixos-container: add --use-host-network option #447155

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
gepbird merged 1 commit into from
Jan 17, 2026
Merged

nixos-container: add --use-host-network option #447155

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
68 changes: 42 additions & 26 deletions pkgs/by-name/ni/nixos-container/nixos-container.pl
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,7 @@ sub showHelp {
[--port <port>]
[--host-address <string>]
[--local-address <string>]
[--use-host-network]
nixos-container destroy <container-name>
nixos-container restart <container-name>
nixos-container start <container-name>
Expand Down Expand Up @@ -74,6 +75,7 @@ sub showHelp {
my $configFile;
my $hostAddress;
my $localAddress;
my $useHostNetwork = 0;
my $flake;
my $flakeAttr = "container";

Expand Down Expand Up @@ -106,6 +108,7 @@ sub copyNixFlags2 {
"config-file=s" => \$configFile,
"host-address=s" => \$hostAddress,
"local-address=s" => \$localAddress,
"use-host-network" => \$useHostNetwork,
"flake=s" => \$flake,
# Nix passthru options.
"log-format=s" => \&copyNixFlags1,
Expand All @@ -127,6 +130,10 @@ sub copyNixFlags2 {
die "With --host-address set, --local-address is required as well!";
}

if ($useHostNetwork && (defined $hostAddress || defined $localAddress)) {
die "--use-host-network cannot be used with --host-address or --local-address!";
}

my $action = $ARGV[0] or die "$0: no action specified\n";

if (defined $configFile and defined $extraConfig) {
Expand Down Expand Up @@ -231,36 +238,44 @@ sub clearContainerState {
# be restricted too.
die "$0: container name ‘$containerName’ is too long\n" if length $containerName > 11;

# Get an unused IP address.
my %usedIPs;
foreach my $confFile2 (glob "$configurationDirectory/*.conf") {
# Filter libpod configuration files
# From 22.05 and onwards this is not an issue any more as directories dont clash
if($confFile2 eq "/etc/containers/libpod.conf" || $confFile2 eq "/etc/containers/containers.conf" || $confFile2 eq "/etc/containers/registries.conf") {
next
my @conf;

if ($useHostNetwork) {
push @conf, "PRIVATE_NETWORK=0\n";
print STDERR "using host network\n";
} else {
# Get an unused IP address.
my %usedIPs;
foreach my $confFile2 (glob "$configurationDirectory/*.conf") {
# Filter libpod configuration files
# From 22.05 and onwards this is not an issue any more as directories dont clash
if($confFile2 eq "/etc/containers/libpod.conf" || $confFile2 eq "/etc/containers/containers.conf" || $confFile2 eq "/etc/containers/registries.conf") {
next
}
my $s = read_file($confFile2) or die;
$usedIPs{$1} = 1 if $s =~ /^HOST_ADDRESS=([0-9\.]+)$/m;
$usedIPs{$1} = 1 if $s =~ /^LOCAL_ADDRESS=([0-9\.]+)$/m;
}
my $s = read_file($confFile2) or die;
$usedIPs{$1} = 1 if $s =~ /^HOST_ADDRESS=([0-9\.]+)$/m;
$usedIPs{$1} = 1 if $s =~ /^LOCAL_ADDRESS=([0-9\.]+)$/m;
}

unless (defined $hostAddress) {
my $ipPrefix;
for (my $nr = 1; $nr < 255; $nr++) {
$ipPrefix = "10.233.$nr";
$hostAddress = "$ipPrefix.1";
$localAddress = "$ipPrefix.2";
last unless $usedIPs{$hostAddress} || $usedIPs{$localAddress};
$ipPrefix = undef;
unless (defined $hostAddress) {
my $ipPrefix;
for (my $nr = 1; $nr < 255; $nr++) {
$ipPrefix = "10.233.$nr";
$hostAddress = "$ipPrefix.1";
$localAddress = "$ipPrefix.2";
last unless $usedIPs{$hostAddress} || $usedIPs{$localAddress};
$ipPrefix = undef;
}

die "$0: out of IP addresses\n" unless defined $ipPrefix;
}

die "$0: out of IP addresses\n" unless defined $ipPrefix;
push @conf, "PRIVATE_NETWORK=1\n";
push @conf, "HOST_ADDRESS=$hostAddress\n";
push @conf, "LOCAL_ADDRESS=$localAddress\n";
print STDERR "host IP is $hostAddress, container IP is $localAddress\n";
}

my @conf;
push @conf, "PRIVATE_NETWORK=1\n";
push @conf, "HOST_ADDRESS=$hostAddress\n";
push @conf, "LOCAL_ADDRESS=$localAddress\n";
push @conf, "HOST_BRIDGE=$bridge\n";
push @conf, "HOST_PORT=$port\n";
push @conf, "AUTO_START=$autoStart\n";
Expand All @@ -269,8 +284,6 @@ sub clearContainerState {

close($lock);

print STDERR "host IP is $hostAddress, container IP is $localAddress\n";

# The per-container directory is restricted to prevent users on
# the host from messing with guest users who happen to have the
# same uid.
Expand Down Expand Up @@ -517,6 +530,9 @@ sub safeRemoveTree {

elsif ($action eq "show-ip") {
my $s = read_file($confFile) or die;
if ($s =~ /^PRIVATE_NETWORK=0$/m) {
die "$0: container uses host network, no separate IP address\n";
}
$s =~ /^LOCAL_ADDRESS=([0-9\.]+)(\/[0-9]+)?$/m
or $s =~ /^LOCAL_ADDRESS6=([0-9a-f:]+)(\/[0-9]+)?$/m
or die "$0: cannot get IP address\n";
Expand Down
Loading