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Merge pull request #2863 from yueguobin/docs/busybox-ifup-cidr-trap

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docs: document the BusyBox ifup CIDR trap in the docker init path
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Jeremy Grossmann 2026-08-28 22:02:58 +02:00 committed by GitHub
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5
gns3server/compute/docker/docker_vm.py
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@ -511,6 +511,11 @@ class DockerVM(BaseNode):
f.write("""# f.write("""#
# This is a sample network config, please uncomment lines to configure the network # This is a sample network config, please uncomment lines to configure the network
# #
# NOTE: at boot /gns3/init.sh applies this file with BusyBox ifup ("ifup -a -f").
# BusyBox ifupdown only brings up "auto" stanzas and requires separate
# "address <ip>" and "netmask <mask>" lines: CIDR notation such as
# "address 10.0.0.1/24" is rejected and the interface stays unconfigured.
#
# Uncomment this line to load custom interface files # Uncomment this line to load custom interface files
# source /etc/network/interfaces.d/* # source /etc/network/interfaces.d/*

5
gns3server/compute/docker/resources/init.sh
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@ -87,6 +87,11 @@ sed -n 's/^ *\(eth[0-9]*\):.*/\1/p' < /proc/net/dev | while read dev; do
done done
# configure network interfaces # configure network interfaces
# NOTE: unless the image ships its own ifupdown in /sbin this is BusyBox ifup,
# which only brings up 'auto' stanzas and does NOT understand CIDR notation:
# 'address <ip>' and 'netmask <mask>' must be separate lines, otherwise the
# stanza fails with "don't have all variables for <iface>/inet" and the
# interface comes up unconfigured.
ifup -a -f ifup -a -f
# continue normal docker startup # continue normal docker startup