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Today's Topics:
1. stuck up record in DNS (Nepryakhin Ivan)
2. Best practice assigning ip addresses to containers (that can
have multiple instances) (Marc Roos)
3. Re: stuck up record in DNS (Simon Hobson)
----------------------------------------------------------------------
Message: 1
Date: Sun, 11 Aug 2019 17:40:47 +0300
From: Nepryakhin Ivan <nepryak...@speechpro.com>
To: dhcp-users@lists.isc.org, bind-us...@lists.isc.org, Kokorin Pavel
<koko...@speechpro.com>
Subject: stuck up record in DNS
Message-ID: <7c22b8ce-db97-dea8-9aa0-f184c4698...@speechpro.com>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
hi guys!
I'm encountered with a strange issue:
?- host with? the name host12-c12-1 one time requested and? get the?
address 10.10.10.12
?- dhcpd correct doing records ( A and PTR ) in? DNS
?- BUT after host shutdown and in the file dhcpd.leases line "binding
state" become in the "free" - records A and PTR staying stuck in the
base of DNS.
from https://linux.die.net/man/5/dhcpd.conf#Dynamic%20Dns%20Updates
i thinking? what DHCP- DDNS work in the next scheme:
?- HOST doing request for ip? address
?- DHCP? getting request and try write RR's A and PTR in DNS
?- DHCP give out ip address and do a record in the file dhcpd.leases
?- when time lease expire? DHCP remove RR's A and PTR from DNS
Please give me vector for a searching or suggestion about mistakes.
Thanks!!
P.S unfortunately i can't upgrade my environment
Environment:
isc-dhcp42-server-4.2.6_1
bind-base-9.9.5_8
cuted of the file dhcpd.lease:
lease 10.10.10.12 {
? starts 5 2019/08/09 11:00:47;
? ends 5 2019/08/09 12:00:47;
? tstp 5 2019/08/09 12:00:47;
? cltt 5 2019/08/09 11:00:47;
? binding state free;
? hardware ethernet 18:10:2b:12:db:12;
? uid "\001\010\000'\216G\220";
}
cuted from the file /etc/named/tsc/tsc.zone:
$TTL 1800?????? ; 30 minutes
host12-c12-1??? A??? 10.10.10.12
??????????????????????? TXT "00ffa9c88e143752544ac44exxxxxxxxxx"
cuted of the file dhcpd.conf:
## DDNS related configuration
ddns-update-style interim;
ddns-rev-domainname "in-addr.arpa.";
ddns-domainname "tsc.";
update-static-leases on;
group {
??????? option routers 10.10.10.1;
??????? ddns-hostname = host-decl-name;
??????? update-optimization false;
??????? update-conflict-detection false;
# example host
??? ??????? host host12 {
??????????????? hardware ethernet 18:31:BF:xx:xx:xx;
??????????????? fixed-address 10.10.10.111;
??????? }
}
--
Best?regards,
*Nepryakhin?Ivan?Sergeevich*
system?administrator
STC?Group
T: +7 (812) 325-88-48, ext 6225
?: +7 (911) 291-81-68
nepryak...@speechpro.com <mailto:nepryak...@speechpro.com>
www.speechpro.com <http://www.speechpro.com>
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Message: 2
Date: Sun, 11 Aug 2019 18:52:02 +0200
From: "Marc Roos" <m.r...@f1-outsourcing.eu>
To: dhcp-users <dhcp-users@lists.isc.org>
Subject: Best practice assigning ip addresses to containers (that can
have multiple instances)
Message-ID: <"H00000710014b9b4.1565542322.sx.f1-outsourcing.eu*"@MHS>
Content-Type: text/plain; charset="US-ASCII"
For tls communication I need to have correct task names. I was thinking
of using the dhcp-client-identifier to have tasks request a pre reserved
ip range, from which they will receive an ip address and dns has already
been setup for these addresses.
Currently I have just a shared-network configured and a group with some
host entries that give a fixed-addresses based on a hardware ethernet.
What would be the easiest way to realize that multiple instances of the
ldap server can be launched having all the same hostname ldap.local they
would get an ip address from the set 192.168.1.1,
192.168.1.2,192.168.1.3,192.168.1.4 based on the client id they are
sending via dhcp.
I saw the dhcpd.conf man page, do I need to do this with
classes/subclasses or is there some other simple option?
------------------------------
Message: 3
Date: Sun, 11 Aug 2019 21:10:45 +0100
From: Simon Hobson <dh...@thehobsons.co.uk>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Cc: bind-us...@lists.isc.org
Subject: Re: stuck up record in DNS
Message-ID: <c918dcff-c5f2-49c0-97c3-a39df2771...@thehobsons.co.uk>
Content-Type: text/plain; charset=us-ascii
Nepryakhin Ivan <nepryak...@speechpro.com> wrote:
> I'm encountered with a strange issue:
See below - it's "correct" operation for your example
> cuted of the file dhcpd.conf:
>
> ## DDNS related configuration
>
> ddns-update-style interim;
> ddns-rev-domainname "in-addr.arpa.";
> ddns-domainname "tsc.";
> update-static-leases on;
>
> group {
>
> option routers 10.10.10.1;
> ddns-hostname = host-decl-name;
>
> update-optimization false;
> update-conflict-detection false;
>
>
> # example host
> host host12 {
> hardware ethernet 18:31:BF:xx:xx:xx;
> fixed-address 10.10.10.111;
> }
>
> }
Where you have a host entry, the lease does NOT go through the normal lifecycle
- and would not normally appear in the leases file.
Without the "update-static-leases on" statement, there would be no DNS update
at all. With it, the DNS will be updated every time the host is leased that
address - but those DNS records are never removed. Normally, the admin would be
expected to add their own DNS entries to match host entries - the
"update-static-leases on" statement is really just to save work.
If you want a "fixed" address for a host, and you want the DNS to be
added/removed as required, then there is one option available. Add the
"reserved" flag to a lease for the host - this fixed the lease so that it will
not be allocated to another host. The lease is in all other respects the same
as any dynamic lease.
------------------------------
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