[pve-devel] [PATCH container 7/9] configure static IP in LXC config for custom entrypoint

From: Filip Schauer <f.schauer@proxmox.com>
To: pve-devel@lists.proxmox.com
Subject: [pve-devel] [PATCH container 7/9] configure static IP in LXC config for custom entrypoint
Date: Tue, 20 May 2025 14:42:55 +0200	[thread overview]
Message-ID: <20250520124257.165949-8-f.schauer@proxmox.com> (raw)
In-Reply-To: <20250520124257.165949-1-f.schauer@proxmox.com>

When a container uses the default `/sbin/init` entrypoint, network
interface configuration is usually managed by processes within the
container. However, containers with a different entrypoint might not
have any internal network management process. Consequently, IP addresses
might not be assigned.

This change ensures that a static IP address is explicitly set in the
LXC config for the container.

Signed-off-by: Filip Schauer <f.schauer@proxmox.com>
---
 src/PVE/LXC.pm | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/PVE/LXC.pm b/src/PVE/LXC.pm
index b2be27e..0131ac3 100644
--- a/src/PVE/LXC.pm
+++ b/src/PVE/LXC.pm
@@ -818,6 +818,18 @@ sub update_lxc_config {
 	if ($lxc_major >= 4) {
 	    $raw .= "lxc.net.$ind.script.up = /usr/share/lxc/lxcnetaddbr\n";
 	}
+
+	if (!defined($d->{link_down}) || $d->{link_down} != 1
+	    && PVE::LXC::Config->get_entrypoint($conf) ne "/sbin/init"
+	) {
+	    $raw .= "lxc.net.$ind.ipv4.address = $d->{ip}\n"
+		if defined($d->{ip}) && $d->{ip} !~ /^(dhcp|manual)$/;
+	    $raw .= "lxc.net.$ind.ipv4.gateway = $d->{gw}\n" if defined($d->{gw});
+	    $raw .= "lxc.net.$ind.ipv6.address = $d->{ip6}\n"
+		if defined($d->{ip6}) && $d->{ip6} !~ /^(auto|dhcp|manual)$/;
+	    $raw .= "lxc.net.$ind.ipv6.gateway = $d->{gw6}\n" if defined($d->{gw6});
+	    $raw .= "lxc.net.$ind.flags = up\n";
+	}
     }
 
     my $had_cpuset = 0;
-- 
2.39.5



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