** Description changed: + [Impact] + + * netcfg currently ends up overwriting DNS search domains provided by + correctly configured DHCP servers in the installer environment. + + * Any preseed command that relies on hostname resolution via a search + domain fail at runtime. + + * The change in this bug allows netcfg to detect that the DHCP-server + provided a domain. + + [Test Case] + + * TBP + + [Regression Potential] + + * TBP + + [Other Info] + + * Anything else you think is useful to include + * Anticipate questions from users, SRU, +1 maintenance, security teams and the Technical Board + * and address these questions in advance + + [Original Report] + When performing a pxe boot using the netboot image from the precise- server-amd64 iso, resolv.conf is modified and the search directive containing the domain provided by dhcp is removed. I can see that the entry is picked up during the boot of the image initially. The file is then overwritten removing the search directive. This seems to correspond with a reverse dns lookup being used to obtain a hostname as shown in the log section provided. Running dhclient after this restores the entry in resolv.conf. In monitorng resolv.conf, I found that /etc/resolv.conf is populated with the following information initially during the pxe boot, which is the result that is needed: search provision.example.com nameserver 10.1.0.2 --------------------------- It is then modified to the following: nameserver 10.1.0.2 ------------------------ Apr 5 14:03:33 netcfg[2088]: DEBUG: No RA received; attempting IPv4 autoconfig Apr 5 14:03:33 netcfg[2088]: WARNING **: Started DHCP client; PID is 2147 Apr 5 14:03:34 dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 1 Apr 5 14:03:34 dhclient: DHCPREQUEST of 10.1.0.112 on eth0 to 255.255.255.255 port 67 Apr 5 14:03:34 dhclient: DHCPOFFER of 10.1.0.112 from 10.1.0.2 Apr 5 14:03:34 dhclient: DHCPACK of 10.1.0.112 from 10.1.0.2 Apr 5 14:03:34 dhclient: bound to 10.1.0.112 -- renewal in 7192 seconds. Apr 5 14:03:36 kernel: [ 21.621493] eth0: no IPv6 routers present Apr 5 14:03:36 netcfg[2088]: DEBUG: Reading domain name returned via DHCP Apr 5 14:03:36 netcfg[2088]: DEBUG: DHCP domain name is '**************' Apr 5 14:03:36 netcfg[2088]: DEBUG: Reading NTP servers from DHCP info Apr 5 14:03:36 netcfg[2088]: DEBUG: Read NTP server 10.1.0.2 Apr 5 14:03:36 netcfg[2088]: DEBUG: Reading nameservers from /etc/resolv.conf Apr 5 14:03:36 netcfg[2088]: DEBUG: Read nameserver 10.1.0.2 Apr 5 14:03:36 netcfg[2088]: DEBUG: State is now 1 Apr 5 14:03:36 netcfg[2088]: DEBUG: State is now 2 Apr 5 14:03:36 netcfg[2088]: DEBUG: State is now 5 Apr 5 14:03:36 netcfg[2088]: DEBUG: Using DNS to try and obtain default hostname Apr 5 14:03:36 netcfg[2088]: DEBUG: Getting default hostname from rDNS lookup of autoconfigured address 10.1.0.112 Apr 5 14:03:36 netcfg[2088]: DEBUG: getnameinfo() returned -3: errno 0 (Success) Apr 5 14:03:36 netcfg[2088]: DEBUG: Getting default hostname from rDNS lookup of autoconfigured address fe80::250:56ff:feb8:5e Apr 5 14:03:36 netcfg[2088]: DEBUG: getnameinfo() returned -2: errno 0 (Success) ------------------- pxelinux.cfg entry: LABEL default - MENU DEFAULT - MENU LABEL Ubuntu 12.04 (64-bit) Installer - IPAPPEND 2 - KERNEL ubuntu/12.04/amd64/linux - APPEND interface=auto lang=en_US locale=en_US console-setup/layoutcode=us priority=critical debian-installer/allow_unauthenticated=true initrd=ubuntu/12.04/amd64/initrd.gz url=http://kickstart/cgi-bin/example.cgi ramdisk_size=10882 root=/dev/ram0 devfs=mount,dall rw -- + MENU DEFAULT + MENU LABEL Ubuntu 12.04 (64-bit) Installer + IPAPPEND 2 + KERNEL ubuntu/12.04/amd64/linux + APPEND interface=auto lang=en_US locale=en_US console-setup/layoutcode=us priority=critical debian-installer/allow_unauthenticated=true initrd=ubuntu/12.04/amd64/initrd.gz url=http://kickstart/cgi-bin/example.cgi ramdisk_size=10882 root=/dev/ram0 devfs=mount,dall rw --
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/974454 Title: resolv.conf loses search directive with domain during pxe boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/netcfg/+bug/974454/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
