MAAS

[2.0rc1] MAAS doesn't honor DNS settings for a subnet for DHCP

Bug #1600720 reported by György Szombathelyi
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
MAAS
Fix Released
Critical
Mike Pontillo
2.0
Fix Released
Critical
Mike Pontillo
MAAS 2.0.0

Bug Description

The dns_server setting for a subnet doesn't reflected in dhcpd.conf.

E.g.
maas ... subnets read
.
.
.
    {
        "cidr": "10.97.36.0/24",
        "dns_servers": [
            "109.71.160.1"
        ],
.
.
.

cat /var/lib/maas/dhcpd.conf
.
.
.
    subnet 10.97.36.0 netmask 255.255.255.0 {
           ignore-client-uids true;
           option subnet-mask 255.255.255.0;
           option broadcast-address 10.97.36.255;
           option domain-name-servers 185.13.91.126; #<- this is the MAAS server
.
.
.

This is MaaS 2.0rc1

Related branches

lp://staging/~mpontillo/maas/subnet-dhcp-dns-settings--bug-1600720
Gavin Panella (community): Approve
Diff: 332 lines (+170/-62)
2 files modified
src/maasserver/dhcp.py (+59/-32)
src/maasserver/tests/test_dhcp.py (+111/-30)
lp://staging/~mpontillo/maas/subnet-dhcp-dns-settings--bug-1600720--2.0
Mike Pontillo (community): Approve
Diff: 347 lines (+173/-63)
3 files modified
docs/changelog.rst (+3/-1)
src/maasserver/dhcp.py (+59/-32)
src/maasserver/tests/test_dhcp.py (+111/-30)
lp://staging/~andreserl/maas/packaging_rc3
Andres Rodriguez (community): Approve
Diff: 90 lines (+54/-6)
2 files modified
debian/changelog (+44/-0)
debian/maas-region-controller.postinst (+10/-6)
Mike Pontillo (mpontillo)
Changed in maas:
status: New → Triaged
importance: Undecided → Critical
Revision history for this message
Blake Rouse (blake-rouse) wrote :

This somewhat relates to https://bugs.launchpad.net/maas/+bug/1576116. We have not determined what the correct behavior will be.

Revision history for this message
Andres Rodriguez (andreserl) wrote :

Hi György,

I was wondering if you could provide a bit more information of what you are trying to do? MAAS 2.0 provides a really nice support for DNS and you can set upstream servers that you want MAAS DNS to resolve to. This would allow you not only have MAAS resolve the local maas managed machines DNS names, but also have MAAS forward to your DNS on the network for upstream DNS connectivity.

Revision history for this message
György Szombathelyi (gyurco) wrote :

The problem is that in our environment, the DNS traffic to the MaaS server is firewalled. So I tought setting the DNS in the subnet should use that DNS server directly (otherwise what is this setting is good for?).

Mike Pontillo (mpontillo)
summary: - Maas doesn't honor DNS settings for a subnet for DHCP
+ [2.0rc1] MAAS doesn't honor DNS settings for a subnet for DHCP
Andres Rodriguez (andreserl)
Changed in maas:
status: Fix Committed → Fix Released
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