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Bug 34886 - net-dns/bind install layout improvement idea
Summary: net-dns/bind install layout improvement idea
Status: RESOLVED INVALID
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: New packages (show other bugs)
Hardware: All Linux
: High enhancement
Assignee: Stewart (RETIRED)
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2003-12-02 05:40 UTC by Peter Simons
Modified: 2004-04-05 08:59 UTC (History)
2 users (show)

See Also:
Package list:
Runtime testing required: ---


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Description Peter Simons 2003-12-02 05:40:21 UTC
The bind packages places the directories where zone files are stored in /var,
more specifically:

  dir /var/bind/pri
  obj /var/bind/pri/127.zone 
  obj /var/bind/pri/localhost.zone 
  dir /var/bind/sec
  obj /var/bind/sec/.keep 
  obj /var/bind/named.ca 
  sym /var/bind/root.cache -> ../../var/bind/named.ca

Shouldn't these files be in _/etc/bind_ rather than in /var? After all, these
are _config files_, which need to be edited (for the master zones) and archived.

I can see, why you'd put the slave zones to /var, since those are generated
files. I can live with that, though I personally would locate them in /etc/bind
anyway, since those are config files of bind too, after all.

Also, I'd like to suggest the names "master" and "slave" rather than "pri" and
"sec".

Reproducible: Always
Steps to Reproduce:
1.
2.
3.
Comment 1 Stewart (RETIRED) gentoo-dev 2003-12-02 21:20:37 UTC
I definately agree with your "master" and "slave" reccomendation. As I've only recently taken over maintainership of BIND, I haven't had the time (or gumption) to make such a sweeping change without user input first.

As to the zonefiles, I believe they are all considered "variable" data by  nature. The root "hint" file, while relatively static, does change (vis, the recent change of, if I recall, F's IP address). Keeping in mind that /etc/ should be mountable 'read-only' according to the LFS.

I'll take input, check general conventions and see what I can do.
Comment 2 Jonathan Stewart 2004-02-03 18:48:23 UTC
No.  The zone files are NOT config files.  They are zone files, containing, essentially, database data.  The zonefiles are expected to change with regularity on any nameserver that is not just functioning as a recursive nameserver for clients.  Primary zones will be updated, secondary zones will as well.

As stewart commented, /etc contains configuration files, and: "A "configuration file" is a local file used to control the operation of a program; it must be static and cannot be an executable binary."  That's from the Filesystem Hierarchy Standard, located at http://www.pathname.com/fhs/pub/fhs-2.3.html.  Basically, anything in /var is expected to change at any time, as a result of a program's operation (think a database server).  Files in /etc however, are only changed by the system administrator by hand.

Personally, i have symlinks in my /etc/bind/ directory.  /etc/bind/pri points to /var/lib/bind/pri.  This would satisfy the reporters concern, i think.  The convenience of having things closely located, while adhering to the rules of filesystem layout. 

This, in turn, brings me to my next point.  According to the FHS, /var/bind/ should not exist.  To wit, "Applications must generally not add directories to the top level of /var. Such directories should only be added if they have some system-wide implication, and in consultation with the FHS mailing list."  The most logical place for it then, from my reading, is /var/lib/bind, and place subdirectories as required within that.

As for primary/secondary versus master/slave, i personally think this is more a matter of preference.  However, it is interesting to note that prior to BIND 8, zones were primary or secondary.  With BIND 8, the wording changed to master and slave.  I'm referring to the configuration words in named.conf.  Therefore, for modern versions of bind (which gentoo obviously uses) master and slave might seem more appropriate.

(btw, why /chroot/dns? It would make more sense as /chroot/bind)
Comment 3 Peter Simons 2004-02-04 05:35:58 UTC
 > No. The zone files are NOT config files. They are zone
 > files, containing, essentially, database data.

Well, I don't know ... Following that logic,
/etc/ssh/sshd_config is not a config file either. It's
database data telling the SSH daemon how to operate. And
while we are at it, why doesn't /etc/passwd lie in /var?
That certainly _is_ a database. Or is it a config file for
the login program?

Anyway, my point is that I want to be able to back-up a
machine's /etc directory and know that I can reproduce the
complete configuration with that. I do not want to have to
maintain a list of obscure directories like
/usr/X11R6/lib/X11/xdm, /var/bind/pri, and so on.

I don't care about slave zones, but the DNS master zone
files are part of the BIND configuration, so they should be
located somewhere near the other bind config files. I don't
see what they should do in /var. It's not like BIND changes
them, the _admin_ changes them.
Comment 4 Jonathan Stewart 2004-02-04 21:09:38 UTC
> And while we are at it, why doesn't /etc/passwd lie in /var?
> That certainly _is_ a database. Or is it a config file for
> the login program?

I'd say the answer to that is historical reasons.  Obviously no one is going to change /etc/passwd any time soon.  For any rule there are exceptions, especially in a system we inherited from 30 years ago.

> I don't care about slave zones, but the DNS master zone
> files are part of the BIND configuration, so they should be
> located somewhere near the other bind config files. I don't
> see what they should do in /var. It's not like BIND changes
> them, the _admin_ changes them.

Well see, that's not entirely true.  You can use tools to update these files.  Automated tools.  DDNS, (dynamic dns that updates dns when DHCP leases are granted) webmin, other custom apps.  It should be obvious that any zone with a significant number of changing hosts will not be edited by hand, as root, by the admin.

> Anyway, my point is that I want to be able to back-up a
> machine's /etc directory and know that I can reproduce the
> complete configuration with that. 

Really sorry to sound harsh, but why should the distro care what you specfically want?  It should do the right thing(tm), which is, IMHO, to follow the FHS.  And also, that idea breaks down if you have any databases using config files stored in /etc/.  Or what about apache?  It's config files are in /etc/apache/, but the data it serves is elsewhere, often in /var/www/.  BIND is a database of sorts, and will actually cease to operate if there is no data, which is what's bugging you.  While other data serving deamons may be more forgiving about missing data, they will still be missing the data, and unable to do anything useful until you replace it.

I see what you would like to do, but the problem is your solution would be limited, and improper in many situations.  Besides, if you really want do put the zonefiles in /etc/bind, go right ahead.  But i think it would be unwise and shortsighted for Gentoo to package BIND like that.
Comment 5 Peter Simons 2004-02-05 04:59:56 UTC
 > I'd say the answer to that is historical reasons.

You missed my point: I wanted to illustrate how the
distinction between "config files" and "databasa data" is
completely arbitrary, IMHO. 


 > You can use tools to update these files.

So what? I can use tools to update pretty much _any_ file on
the hard disc. That's not a special property of master zones
files. (And BTW: Dynamic DNS do not change the zone files,
the changes are kept in separate journal files, which you
should, I agree, place in /var.)

My point is that a master zone file is absolutely not the
same thing as an deferred e-mail in /var/spool/mqueue. It
will not go away after a time-out, it will not be modified
by BIND, and BIND will not be able to start-up properly,
when it's missing. 


 > Really sorry to sound harsh [...]

Don't worry about sounding harsh. We're all on the same
side, right? :-) Just say what you think, do the same. 


 > why should the distro care what you specfically want?  

I'm trying to explain why there are good reasons for my
preferred directory layout. If you don't agree, well, then
that's fine. I know how to change the paths. We are arguing
about something that's a matter of taste, not a matter of
fact. I can distinguish between those two concepts.


 > The right thing(tm) [is IMHO] to follow the FHS.

I personally don't care much for the FHS. I'll follow it
where it makes sense and I'll ignore it when it doesn't.
Besides, I don't think your interpretation of the FHS
applies to DNS master zone files.


 > [That] idea breaks down if you have any databases using
 > config files stored in /etc/.  

I don't think I understand that statement.


 > Or what about apache? 

I don't see how Apache has anything to do with this matter.
Besides, you might want to look at #33476 for proof that I'm
not advocating to put everything into /etc at all. On the
contrary. :-)


 > I see what you would like to do, but the problem is your
 > solution would be limited, and improper in many situations.  

I have been running BIND that way for several years and I
have never found the solution to be "improper". Could you
give a concrete example, where having the master zone files
in /etc causes problems?
Comment 6 Peter Simons 2004-04-05 08:59:12 UTC
There seems to be little interest in this topic except from my side. So I'll close the bug report, doesn't seem to be useful any more.