Reconfirmed yakkety today.
Also tested "ip6= without ip=": which yakkety currently hates, but we've
decided to handle separately after this SRU lands, partially because
it's a trivial workaround ("for ipv6-only, specify "ip6=dhcp ip=off")
and also not a case that anything needing the SRU actually does. (MAAS
always specifies both, with one of them set to "off".)
Marking this verification-done.
** Description changed:
initramfs' configure_networking function uses ipconfig to configure the
network.
ipconfig does not support dhcpv6. See:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=627164
Related bugs:
* bug 1229458: grub2 needed changes
* bug 1621615: network not configured when ipv6 netbooted into cloud-init
* bug 1635716: Can't bring up a machine on a dual network (ipv4 and ipv6)
Bugs related to uploads for this specific SRU:
cloud-init:
bug 1460715: different fix unrelated to this SRU
bug 1639930: ip6= on kernel command line
bug 1642679: different fix unrelated to this SRU
bug 1644043: different fix unrelated to this SRU
ifupdown:
bug 1629972: networking.service takes down lo on stop
initramfs-tools:
bug 1621507: no IPv6 DHCP support in early boot
bug 1628306: regression-update (failure when ip="")
bug 1631474: regression-update (failure when ip=:::::eth0:dhcp)
isc-dhcp:
bug 1621507: no IPv6 DHCP support in early boot
bug 1633479: dhclient does not wait for IPv6 DAD
open-iscsi:
bug 1621507: no IPv6 DHCP support in early boot
[Impact]
It is not possible to netboot Ubuntu with a network-based root
filesystem in an ipv6-only environment. Anyone wanting to netboot in an
ipv6-only environment is affected.
[Stable Fix]
These uploads add "ip6=" to the command line syntax to configure ipv6
using the defacto isc-dhcp-client. IPv4 configuration (and "ip="
syntax) remain unchanged.
Valid format for the ip6= command line option is:
ip6=none (or ip6=off or ip6=) -- do not configure ipv6
ip6=DEVICE -- run IPv6 dhclient on device DEVICE.
[Test Case]
See Bug 1229458. Configure radvd, dhcpd, and tftpd for your ipv6-only
netbooting world. Pass the boot process an ipv6 address to talk to, and
see it fail to configure the network.
[Regression Potential]
1) This increases the uncompressed initramfs size by approximately 500KB,
since isc-dhcp-client is added, but klibc is still needed for some other
things, and is therefore present. On systems with a very small /boot
partition, this could result in failure to upgrade the initramfs.
2) In at least some cases, DHCP network configuration shifts from klibc's
ipconfig to isc-dhcp-client's dhclient. This should be of minimal risk, as
isc-dhcp-client is in very very widespread use. In the event of a regression,
network boot would fail, but the prior kernel should still be bootable.
[Tests for verification]
Whoever checks the last one off, please mark verification done.
MAAS test cases:
X / Y
- [+]/[ ] MAAS on IPv6-only network
- [+]/[ ] MAAS on IPv4-only network
- [+]/[ ] MAAS booting IPv4 on dual-stack network (with and without dhcp6)
- [+]/[ ] MAAS booting IPv6 on dual-stack network (with and without dhcp4)
+ [+]/[+] MAAS on IPv6-only network
+ [+]/[+] MAAS on IPv4-only network
+ [+]/[+] MAAS booting IPv4 on dual-stack network (with and without dhcp6)
+ [+]/[+] MAAS booting IPv6 on dual-stack network (with and without dhcp4)
Non-MAAS test cases:
X / Y
[+]/[+] ip="" and ip6 not present
[+]/[+] ip=:::::eth0:dhcp and ip6 not present
[+]/[+] d-i install with iSCSI remote root should complete normally
[+]/[+] Validate normal boot without remote root
[+]/[+] Booting an iSCSI remote root via IPv4 (using ip=)
[+]/[+] Booting an iSCSI remote root via IPv6 (using ip6=)
[+]/[+] Booting an iSCSI remote root via IPv4 (no ip=, d-i use case)
[+]/[+] Booting an iSCSI remote root with BOOTIF specified (BOOTIF=mac of
booting device)52-54-00-53-5d-24
[+]/[+] Booting an iSCSI remote root on mixed network with no options (IPv4
should be used only)
** Tags removed: verification-needed
** Tags added: verification-done
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https://bugs.launchpad.net/bugs/1621507
Title:
initramfs-tools configure_networking() fails to dhcp ipv6 addresses
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