I have a machine which for various reasons has to connect to a selection of networks, using DHCP to obtain its IP address on each network. I have a domain I use for it, and it has secure access to ensure that <hostname>.<my domain> is pointed at the right IP address; /etc/init.d/domainname and /etc/dnsdomainname are set up to ensure that it always has a consistent name with appropriate MX and A records. DHCP is also used to get the address of DNS servers for the local network; some of the networks are heavily firewalled, so using a fixed DNS server is not an option, because it causes DNS to break completely. I can't let the DNS domain name vary, since I do not want to risk admin mail going to the admins of some of the networks I connect to, but dhcpcd insists on adding a "search" line to the bottom of resolv.conf, overriding my manually set domain name. /etc/init.d/domainname is run after dhcpcd has picked up an IP address; therefore, I would expect it to override the settings from dhcpcd. However, it in fact is overriden by the DHCP settings. The solution is to fix /etc/init.d/domainname to append "domain <my domain>" to /etc/resolv.conf, rather than have it place it at the beginning of the file. This can be achieved by changing the word "BEGIN" on line 54 to "END". Reproducible: Always Steps to Reproduce: 1. Set a DNS domain name in /etc/dnsdomainname 2. Use dhcpcd to obtain an IP address and DNS servers/search domain for eth0 3. Run /etc/init.d/domainname 4. Do hostname -f Actual Results: I get an "Unknown host" error Expected Results: Displayed my hostname as a FQDN. Portage 2.0.50-r1 (default-x86-1.4, gcc-3.3.2, glibc-2.3.2-r9, 2.6.3-gentoo-r1) ================================================================= System uname: 2.6.3-gentoo-r1 i686 AMD Athlon(tm) processor Gentoo Base System version 1.4.3.13 ccache version 2.3 [enabled] Autoconf: sys-devel/autoconf-2.58-r1 Automake: sys-devel/automake-1.7.7 ACCEPT_KEYWORDS="x86" AUTOCLEAN="yes" CFLAGS="-march=athlon-tbird -mcpu=athlon-tbird -Os -pipe" CHOST="i686-pc-linux-gnu" COMPILER="gcc3" CONFIG_PROTECT="/etc /usr/X11R6/lib/X11/xkb /usr/kde/2/share/config /usr/kde/3.2/share/config /usr/kde/3/share/config /usr/lib/mozilla/defaults/pref /usr/share/config /usr/share/texmf/dvipdfm/config/ /usr/share/texmf/dvips/config/ /usr/share/texmf/tex/generic/config/ /usr/share/texmf/tex/platex/config/ /usr/share/texmf/xdvi/ /var/qmail/control" CONFIG_PROTECT_MASK="/etc/gconf /etc/terminfo /etc/env.d" CXXFLAGS="-march=athlon-tbird -mcpu=athlon-tbird -Os -pipe" DISTDIR="/usr/portage/distfiles" FEATURES="autoaddcvs ccache sandbox" GENTOO_MIRRORS="http://gentoo.oregonstate.edu http://distro.ibiblio.org/pub/Linux/distributions/gentoo" MAKEOPTS="-j2" PKGDIR="/usr/portage/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/portage" SYNC="rsync://rsync.gentoo.org/gentoo-portage" USE="3dnow X aalib acpi alsa apm arts artswrappersuid avi berkdb cdr crypt cups dga dvd encode esd evms2 fam foomaticdb gd gdbm gif gnome gpm gtk gtk2 guile ieee1394 imap imlib ipv6 java jpeg kde ldap libg++ libwww mad maildir mikmod mmx motif mozilla mpeg msn ncurses nls nptl oggvorbis opengl oss pam pdflib perl pic png postgres python qt quicktime rage128 readline samba sdl slang spell ssl svga tcltk tcpd tetex tiff truetype usb video_cards_rage128 wmf x86 xml xml2 xmms xv zlib"
Created attachment 39731 [details, diff] patch to strip "search" from /etc/resolv.conf created by dhcpcd
Comment on attachment 39731 [details, diff] patch to strip "search" from /etc/resolv.conf created by dhcpcd This fixes the problem on my network. This will not change behavior if /etc/dnsdomainname doesn't exist.
you can put multiple search lines in resolv.conf, you certainly dont want to go stripping all of them if you dont want dhcpcd screwing with your resolv.conf, use the -R option
I'm not trying to strip any lines; the domainname script *adds* a line, which is overriden by those written by DHCPCD. I want it to add the same line, but at the other end of the file, thus overriding those written by DHCPCD, so that e-mail sent by other scripts to root@<local machine name and domain> goes to the domain that domainname sets, not to one added by DHCPCD. The idea is that *if* I set a domainname with the script, it should override those given by DHCPCD; this *leaves* the lines from DHCPCD alone.
Created attachment 40709 [details, diff] A patch to make the domain name set by domainname the preferred domain of the machine, overriding (but not replacing) those supplied by DHCP Just to add; a fixed resolv.conf is not an option. At least two of the networks I connect to have firewall rules that stop me using any DNS servers other than the ones the DHCP server indicates. The correct solution is not to do as Andrew Evans suggests, and strip search (which breaks on one of the networks I use), but to change the awk script to use "END" instead of "BEGIN"; I've attached a patch that does this. This causes the machine to place itself in the domain supplied by dnsdomainname, but to still search the domains supplied by DHCP
my comment was going by the patch submitted ... i missed the fact it wasnt submitted by the original bug reporter ;) changed behavior to append the line to the file, thanks
