Red Hat Bugzilla – Bug 304611
resolv.conf hardwired in /sbin/dhclient-script and network-functions
Last modified: 2017-08-08 07:38:48 EDT
Description of problem: the file /etc/resolv.conf is hardwired in /sbin/dhclient-script and /etc/ sysconfig/network-scripts/network-functions. It should be a configurable option, defaulting to "/etc/resolv.conf". This would allow for dynamicly assigned addresses, while being able to set up my own DNS, resolving against "localhost" only. Version-Release number of selected component (if applicable): dhclient-3.0.5-40.fc7 How reproducible: always Steps to Reproduce: 1. install dhclient, dnsmasq 2. setup your own DNS using dnsmasq, connect to a network your system is assigned a dynamic adress changing every hour. 3. watch "/etc/resolv.conf" overwritten every hour, rendering your local DNS unused, breaking your carefully designed setup. Actual results: As expected, since "/etc/resolv.conf" is hardwired. Expected results: With a configurable position and name, dhclient would write "/etc/resolv.conf" to say "/etc/resolv.dnsmasq", leaving "/etc/resolv.conf" untouched, allowing for a local DNS, resolving local names. Additional info: diff network-functions network-fn-configurable: 9a10,12 > [ -f "/etc/sysconfig/dhclient" ] && . /etc/sysconfig/dhclient > [ -z "$resolvconf" ] && resolvconf=/etc/resolv.conf > 266c269 < if ! grep search /etc/resolv.conf >/dev/null 2>&1; then --- > if ! grep search $resolvconf >/dev/null 2>&1; then 270c273 < cat /etc/resolv.conf > $rsctmp --- > cat $resolvconf > $rsctmp 404c407 < # Invoke this when /etc/resolv.conf has changed: --- > # Invoke this when /etc/resolv has changed: 407c410 < s=`/bin/grep '^[\ \ ]*option' /etc/resolv.conf 2>/dev/null`; --- > s=`/bin/grep '^[\ \ ]*option' $resolvconf 2>/dev/null`; 434c437 < (echo "$s" > /etc/resolv.conf;) >/dev/null 2>&1; --- > (echo "$s" > $resolvconf;) >/dev/null 2>&1; 437,438c440,441 < [ -x /sbin/restorecon ] && /sbin/restorecon /etc/resolv.conf >/dev/ null 2>&1 # reset the correct context < logger -p local7.notice -t "NET" -i "$0 : updated /etc/resolv.conf"; --- > [ -x /sbin/restorecon ] && /sbin/restorecon $resolvconf >/dev/null 2>&1 # reset the correct context > logger -p local7.notice -t "NET" -i "$0 : updated $resolvconf"; diff dhclient-script dhclient-script-var: 96c96 < . /etc/sysconfig/network-scripts/network-functions --- > . /etc/sysconfig/network-scripts/network-fn-var The configuration file "/etc/sysconfig/dhclient" holds: resolvconf=/etc/resolv.dnsmasq
You can already provide your own DNS override via /etc/dhclient.conf. Use the supersede domain-name and supersede domain-name-servers directives in dhclient.conf and you can override whatever the DHCP lease provides. See dhclient.conf(5) for more details.
No, no, no. That is not the same! If I superseed domain-name-servers, I provide a *fixed* set of domain name servers. If I superseed domain-name, I provide a *fixed* domain name. This fixed name is then entered into "/etc/resolv.conf". But what, when the provider changes the domain names, assuming all users use dhcp for getting there domain name servers (and in some cases there domain name)? The superseeded domain name servers get further entered into resolv.conf making you wonder why no dns query does give back the an address for say "redhat.com". Again: assume you are running your own dns server, assume this being dnsmasq; assume further your provider gives back 10.0.0.1 and 10.0.0.2 for his upstream dns servers and "example.home" for the domain name. Now resolv.conf is set to search example.home nameserver 10.0.0.1 nameserver 10.0.0.2 The system will query the providers dns, but not your own, localy running dns. This would only be done if resolv.conf holding search example.home nameserver 127.0.0.1 superseeding domain-name-servers could overcome this problem, but in this case: what servers should your local dns query for names not known to it? OK, I can copy the setup resolv.conf to a resolv.localdns and make my local dns read this copied version, setting resolv.conf to point to my localy running dns. This will work --- until the lease is renewed. After that my resolv.conf is *overwritten* with the data given by the provider, rendering my local dns unused again! If my provider handles me a new set of dns servers with every renew of the lease, I will have to copy resolv.conf every time I receive a new lease. If this is done all 900 seconds, you are in some trouble. But this is normal in a variety of networks, notably WLAN. Superseeding domain-name-servers and domain-name does not help out. The only thing helping would be to write what the provider gives back for domain-name- servers and domain-name to an other file than "/etc/resolv.conf". AFAIK there is no way doing this with the provided scripts (and there is no way setting this up from dhclient.conf). These *will* in all cases write to "/etc/ resolv.conf", making a local dns useless if a lease is renewed within a short period of time. The change is simple: make the file resolve data is written to configurable. I provided diffs doing this, solving the problem.
Provide unified diffs (diff -u), not contextual diffs. Attach them to the bug report.
Created attachment 225341 [details] Make file to which "/etc/resolv.conf" is written a configurable option. The unified diff, as requested.
Reassigning to initscripts, which is the component that owns /etc/sysconfig/network-scripts/network-functions (see rpm -qf).
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This is the same for Fedora 8 and 9.
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I really don't think this is appropriate for Fedora - this is far outside of the normal usage cases.b
Could be quite common if you are using virtualisation technologies like VMware, Virtual Box or Qemu. Your local host assigns via DHCP local addresses to your virtual machines. Quite a bit a buggy way to assign static addresses to all VMs you create on the fly. Would be nice to have some way to configure a local DNS to resolve these local VMs to have them accessible via your host only network with names, not numbers! At the moment configuring this is for freaks and cracks really knowing what they are doing. But not for the average user. Since Linux likes to go for the average user and the changes involved are easy to make --- why not??
(In reply to comment #9) > I really don't think this is appropriate for Fedora - this is far outside of > the normal usage cases.b Please reconsider this. I have the same problem. I have a local dnsmasq and bind for my virtual machines, but my "ISP" forces me to use dhcp. Therefore I, too, need a way to get the dhcp-data, but not have dhclient mess with /etc/resolv.conf.
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Fedora 12 changed to end-of-life (EOL) status on 2010-12-02. Fedora 12 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. Thank you for reporting this bug and we are sorry it could not be fixed.
dhclient-4.2.0-16.P2.fc14
Hey Till Maas if you want a workaround, just set resolv.conf the way you want it and make it immutable: chattr +i /etc/resolv.conf then if you need to edit it to unlock it: chattr -i /etc/resolv.conf
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still a problem in current Rawhide
Can't you just set PEERDNS=no in your ifcfg files?
This bug appears to have been reported against 'rawhide' during the Fedora 24 development cycle. Changing version to '24'. More information and reason for this action is here: https://fedoraproject.org/wiki/Fedora_Program_Management/HouseKeeping/Fedora24#Rawhide_Rebase
This message is a reminder that Fedora 24 is nearing its end of life. Approximately 2 (two) weeks from now Fedora will stop maintaining and issuing updates for Fedora 24. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as EOL if it remains open with a Fedora 'version' of '24'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version. Thank you for reporting this issue and we are sorry that we were not able to fix it before Fedora 24 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora, you are encouraged change the 'version' to a later Fedora version prior this bug is closed as described in the policy above. Although we aim to fix as many bugs as possible during every release's lifetime, sometimes those efforts are overtaken by events. Often a more recent Fedora release includes newer upstream software that fixes bugs or makes them obsolete.
Fedora 24 changed to end-of-life (EOL) status on 2017-08-08. Fedora 24 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.