If you ran makedns -n node1 it is only going to set up DNS for node1. Check the examples in man makedns.
The makedns -d node1 should only have removed node1.
It you want to set up a new DNS for all nodes in /etc/hosts run makedns
-n
Examples
1. To set up DNS for all the hosts in /etc/hosts file.
makedns
2. To set up DNS for node1.
makedns node1
3. To create a new named configuration and db files for all hosts
in /etc/hosts.
makedns -n
4. To delete the DNS records for node1.
makedns -d node1
Lissa K. Valletta
8-3/B10
Poughkeepsie, NY 12601
(tie 293) 433-3102
From: Lissa Valletta/Poughkeepsie/IBM@IBMUS
To: xCAT Users Mailing list <[email protected]>,
Cc: [email protected]
Date: 01/16/2014 02:22 PM
Subject: Re: [xcat-user] Makedns wiping out DNS records
Are you running makedns or makedns -n?
Lissa K. Valletta
8-3/B10
Poughkeepsie, NY 12601
(tie 293) 433-3102
Inactive hide details for Russell Jones ---01/16/2014 01:53:16 PM---Just a
tip and something that bit me before - bind updates Russell Jones
---01/16/2014 01:53:16 PM---Just a tip and something that bit me before -
bind updates its data in the journal and won't dump n
From: Russell Jones <[email protected]>
To: [email protected],
Date: 01/16/2014 01:53 PM
Subject: Re: [xcat-user] Makedns wiping out DNS records
Just a tip and something that bit me before - bind updates its data in the
journal and won't dump new data to the zone files immediately. You can
force it do dump the data so that you can see it by restarting bind.
You can also test to make sure DNS is being added by digging for the
record. IE, dig @localhost dayhoff.morgan.haib.org. If you get an A record
back, your DNS is working fine.
On 1/16/2014 12:39 PM, Josh Nielsen wrote:
Is there any way to debug what exactly the makedns command does to
named/bind, as in what command it issues? Or does it directly edit
the named files? I could run the named daemon with "-d 9" for
debugging level 9 but I've done that before and the output is
daunting and nearly incomprehensible for the non-veteran in DNS. As I
said, running "makedns" by it self works fine, but using -d or -n
causes problems. I have no way of knowing what xCAT does in the
background with those options.
I checked and /etc/hosts is correct, and /etc/resolv.conf is as well.
The site table has all five possible dns attributes (domain,
dnshandler, forwarders, master, and nameservers) set correctly, and
the networks are defined for every subnet we use. There is nothing
that I can see that would cause it to parse incorrectly, especially
since it echoed to /var/log/messages that it was going
through /etc/hosts and creating entries (but really it didn't) for
each host. I did have to add one entry manually into /etc/hosts
though for a SAN storage system. Would seeing an unrecognized node
cause problems? And if so why is there nothing in the logs about it?
I saw it say that it was adding an entry for that node (even though
it didn't - like every other entry):
"Jan 16 10:32:53 x3650-head01 named[8249]: client 10.20.0.1#56079:
updating zone 'morgan.haib.org/IN': adding an RR at '
dayhoff.morgan.haib.org' A"
If I can find out what xCAT is doing to make the changes perhaps I
can reproduce it manually in a test environment and see what is
causing it to wipe out the entries.
-Josh
On Thu, Jan 16, 2014 at 12:01 PM, Lissa Valletta <[email protected]>
wrote:
You will see in the document that makedns is very dependent on
what you do to setup you Management node.
Your /etc/hosts /etc/resolv.conf, etc Setting that must be
added to the database for your cluster such as in the site
table, defining your network in the networks table. You can
use that document to check your database configuration.
Lissa K. Valletta
8-3/B10
Poughkeepsie, NY 12601
(tie 293) 433-3102
Inactive hide details for Josh Nielsen
---01/16/2014 12:44:27 PM---Okay, I will look
through that document. This is the first aJosh Nielsen
---01/16/2014 12:44:27 PM---Okay, I will look through that
document. This is the first and only time I've used XCATBYPASS
with t
From: Josh Nielsen <[email protected]>
To: xCAT Users Mailing list <[email protected]>,
Date: 01/16/2014 12:44 PM
Subject: Re: [xcat-user] Makedns wiping out DNS records
Okay, I will look through that document. This is the first and
only time I've used XCATBYPASS with that command (to get more
clarity into what was going on in the background). Makedns has
been presenting us with the problem(s) I mentioned for well
over a year now, with previous versions of xCAT as well. I'm
guessing that if this doesn't happen for other people that it
must have been some setting when xCAT was originally installed
which was misconfigured, or maybe something funny in one of the
xCAT db tables like 'site'. I just wanted to see if anyone has
had problems with using the "-n" or "-d" options deleting more
than they are supposed to.
-Josh
On Thu, Jan 16, 2014 at 11:23 AM, Lissa Valletta <
[email protected]> wrote:
We have an entire doc on name resolution also I would
not make it a common practice to use XCATBYPASS mode.
Running with the xcatd is much more secure and some
things do not work well in XCATBYPASS mode.
https://sourceforge.net/apps/mediawiki/xcat/index.php?title=Cluster_Name_Resolution
Lissa K. Valletta
8-3/B10
Poughkeepsie, NY 12601
(tie 293) 433-3102
Inactive hide details for Josh Nielsen
---01/16/2014 12:03:28 PM---Regardless of the
version of xCAT we have used in the past, Josh Nielsen
---01/16/2014 12:03:28 PM---Regardless of the version of
xCAT we have used in the past, my coworkers and I have
noticed that run
From: Josh Nielsen <[email protected]>
To: xCAT Users Mailing list <
[email protected]>,
Date: 01/16/2014 12:03 PM
Subject: [xcat-user] Makedns wiping out DNS records
Regardless of the version of xCAT we have used in the
past, my coworkers and I have noticed that running
"makedns" with any following options can be dangerous for
us, because something happens where it will wipe out all
the records in DNS. If we run "makedns" with no options
generally any new nodes that have been added
to /etc/hosts will be parsed and added appropriately.
Maybe I am misunderstanding what happens when the command
is run.
Here is a recent example. My entry for a new node
"xcat-serv1" for some reason didn't have the reverse
lookup from the IP in the DNS file for that subnet
(db.10.20), and so I decided to try to remove just the
DNS entry for that node and then re-add it. Here is what
I ran:
----
# makedns -d xcat-serv1
Handling xcat-serv1 in /etc/hosts.
Getting reverse zones, this may take several minutes for
a large cluster.
Completed getting reverse zones.
Updating zones.
Completed updating zones.
Updating DNS records, this may take several minutes for a
large cluster.
Completed updating DNS records.
----
Then I ran it with the "-n" parameter to re-add that node
(with XCATBYPASS=1):
----
# export XCATBYPASS=1
[root@x3650-head01 centos]# makedns -n xcat-serv1
Unrecognized escape \h passed through
at /opt/xcat/lib/perl/xCAT/zvmUtils.pm line 2408.
Subroutine handled_commands redefined
at /opt/xcat/lib/perl/xCAT_plugin/hosts.pm line 28.
Subroutine delnode redefined
at /opt/xcat/lib/perl/xCAT_plugin/hosts.pm line 33.
Subroutine addnode redefined
at /opt/xcat/lib/perl/xCAT_plugin/hosts.pm line 58.
Subroutine build_line redefined
at /opt/xcat/lib/perl/xCAT_plugin/hosts.pm line 117.
Subroutine addotherinterfaces redefined
at /opt/xcat/lib/perl/xCAT_plugin/hosts.pm line 182.
Subroutine delotherinterfaces redefined
at /opt/xcat/lib/perl/xCAT_plugin/hosts.pm line 209.
Subroutine add_hosts_content redefined
at /opt/xcat/lib/perl/xCAT_plugin/hosts.pm line 234.
Subroutine process_request redefined
at /opt/xcat/lib/perl/xCAT_plugin/hosts.pm line 305.
Subroutine writeout redefined
at /opt/xcat/lib/perl/xCAT_plugin/hosts.pm line 511.
Subroutine donics redefined
at /opt/xcat/lib/perl/xCAT_plugin/hosts.pm line 545.
Subroutine getIPdomain redefined
at /opt/xcat/lib/perl/xCAT_plugin/hosts.pm line 801.
Handling xcat-serv1 in /etc/hosts.
Getting reverse zones, this may take several minutes for
a large cluster.
Completed getting reverse zones.
Stopping named: .
[ OK ]
Updating zones.
Completed updating zones.
Restarting named
Restarting named complete
Updating DNS records, this may take several minutes for a
large cluster.
Completed updating DNS records.
DNS setup is completed
....
....
----
When I did an 'ls' in /var/named many records were
missing and the ones still left we virtually empty except
one entry for the headnode:
BEFORE:
# ls /var/named
data db.10.29 db.10.40 db.127.0.0
db.172.26.41 db.172.29 db.192.168.100 db.haig
db.morgan.haib.org.jnl
db.10.29.jnl db.10.60 db.172.20 db.172.26.42
db.172.30 db.cache db.morgan slaves
db.10.20 db.10.30 db.10.60.jnl db.172.26.40
db.172.26.43 db.172.40 db.haib
db.morgan.haib.org
AFTER:
# ls /var/named
data db.10.20.jnl db.10.29.jnl db.10.30.jnl
db.10.40.jnl db.10.60.jnl db.172.26.41 db.172.26.43
db.morgan.haib.org.jnl
db.10.20 db.10.29 db.10.30 db.10.40
db.10.60 db.172.26.40 db.172.26.42
db.morgan.haib.org slaves
As you can see several files are missing, Luckily I made
a full backup yesterday and was able to restore the old
files.
>From /var/log/messages you can see the initial deletion
message for "xcat-serv1":
----
Jan 16 10:32:55 x3650-head01 named[8249]: client
10.20.0.1#56080: updating zone '40.10.IN-ADDR.ARPA/IN':
adding an RR at '11.102.40.10.IN-ADDR.ARPA' PTR
Jan 16 10:32:55 x3650-head01 named[8249]: client
10.20.0.1#56080: updating zone '40.10.IN-ADDR.ARPA/IN':
adding an RR at '7.101.40.10.IN-ADDR.ARPA' PTR
Jan 16 10:32:55 x3650-head01 named[8249]: client
10.20.0.1#56080: updating zone '40.10.IN-ADDR.ARPA/IN':
adding an RR at '10.102.40.10.IN-ADDR.ARPA' PTR
Jan 16 10:32:55 x3650-head01 named[8249]: client
10.20.0.1#56080: updating zone '40.10.IN-ADDR.ARPA/IN':
adding an RR at '27.102.40.10.IN-ADDR.ARPA' PTR
Jan 16 10:32:55 x3650-head01 named[8249]: client
10.20.0.1#56080: updating zone '40.10.IN-ADDR.ARPA/IN':
adding an RR at '33.101.40.10.IN-ADDR.ARPA' PTR
Jan 16 10:32:55 x3650-head01 named[8249]: client
10.20.0.1#56080: updating zone '40.10.IN-ADDR.ARPA/IN':
adding an RR at '1.102.40.10.IN-ADDR.ARPA' PTR
Jan 16 10:32:55 x3650-head01 named[8249]: client
10.20.0.1#56080: updating zone
Then for the makedens -a xcat-serv you actually see it
update EVERY ZONE:
Jan 16 10:32:42 x3650-head01 named[8249]: client
10.20.0.1#43788: updating zone '30.10.IN-ADDR.ARPA/IN':
adding an RR at '1.50.30.10.IN-ADDR.ARPA' PTR
Jan 16 10:32:42 x3650-head01 named[8249]: client
10.20.0.1#43788: updating zone '30.10.IN-ADDR.ARPA/IN':
adding an RR at '4.50.30.10.IN-ADDR.ARPA' PTR
Jan 16 10:32:42 x3650-head01 named[8249]: client
10.20.0.1#43788: updating zone '30.10.IN-ADDR.ARPA/IN':
adding an RR at '2.2.30.10.IN-ADDR.ARPA' PTR
Jan 16 10:32:42 x3650-head01 named[8249]: client
10.20.0.1#43788: updating zone '30.10.IN-ADDR.ARPA/IN':
adding an RR at '3.50.30.10.IN-ADDR.ARPA' PTR
Jan 16 10:32:42 x3650-head01 named[8249]: client
10.20.0.1#43788: updating zone '30.10.IN-ADDR.ARPA/IN':
adding an RR at '1.2.30.10.IN-ADDR.ARPA' PTR
Jan 16 10:32:42 x3650-head01 named[8249]: client
10.20.0.1#43788: updating zone '30.10.IN-ADDR.ARPA/IN':
adding an RR at '2.50.30.10.IN-ADDR.ARPA' PTR
....
[long list]
----
After this is when I listed and saw files missing and
most of the records empty. My guess is the "-d" wiped out
all the records somehow and not just "xcat-serv1". Either
that or the makedns -a deleted all the records in order
to recreate them. But why would it affect ALL the records
when I specifically typed "xcat-serv1"? I tried a plain
"makedns" with no options after this and it also says
"adding an RR at" (is that even the expected message?)
for all the IPs and zones but nothing actually gets
added. What is up with that? If it just something with
our installation or does makedns do this foe other people
as well?
Regards,
Josh
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