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Migration from ISC 4.4.1 to Red Hat dhcpd (ISC 4.1.1-P1)

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Pereida, Alejandro

Migration from ISC 4.4.1 to Red Hat dhcpd (ISC 4.1.1-P1)

How can a dhcp server that has been working with ISC 4.4.1 be migrated to ISC 4.1.1-P1 (Red Hat supported version) without losing entries on the dhcpd.leases file?

The dhcpd.conf file from the 4.4.1 version seems to run fine on 4.1.1-P1 but the dhcpd.leases file gets trimmed, the original dhcpd.leases file under 4.4.1 has about 3400 active leases and once the 4.1.1 is started it complains about "corrupt lease file" and trims it to a point where the dhcpd.leases file now shows only 350 active leases (almost 10 times less), here is the error we get once the 4.1.1-P1 server is started using a dhcpd.leases file that was produced with 4.4.1:

First time 4.1.1-P1 is executed:
Oct 2 23:34:45 webdhcp2 dhcpd: Corrupt lease file - possible data loss!
Oct 2 23:34:45 webdhcp2 dhcpd: Corrupt lease file - possible data loss!
Oct 2 23:34:45 webdhcp2 dhcpd: Corrupt lease file - possible data loss!
Oct 2 23:34:45 webdhcp2 dhcpd: Corrupt lease file - possible data loss!
Oct 2 23:34:45 webdhcp2 dhcpd: Corrupt lease file - possible data loss!
Oct 2 23:34:45 webdhcp2 dhcpd: /var/lib/dhcpd/dhcpd.leases line 3208: Unexpected configuration directive.
Oct 2 23:34:45 webdhcp2 dhcpd: rewind
Oct 2 23:34:45 webdhcp2 dhcpd: ^
Oct 2 23:34:45 webdhcp2 dhcpd: /var/lib/dhcpd/dhcpd.leases line 3208: possibly corrupt lease file
Oct 2 23:34:45 webdhcp2 dhcpd: rewind binding state free;
Oct 2 23:34:45 webdhcp2 dhcpd: ^

Second time 4.1.1-P1 is executed:
Oct 2 23:35:34 webdhcp2 dhcpd: Internet Systems Consortium DHCP Server 4.1.1-P1
Oct 2 23:35:34 webdhcp2 dhcpd: Copyright 2004-2010 Internet Systems Consortium.
Oct 2 23:35:34 webdhcp2 dhcpd: All rights reserved.
Oct 2 23:35:34 webdhcp2 dhcpd: For info, please visit https://www.isc.org/software/dhcp/
Oct 2 23:35:34 webdhcp2 dhcpd: WARNING: Host declarations are global. They are not limited to the scope you declared them in.
Oct 2 23:35:34 webdhcp2 dhcpd: Not searching LDAP since ldap-server, ldap-port and ldap-base-dn were not specified in the config file
Oct 2 23:35:34 webdhcp2 dhcpd: Wrote 0 class decls to leases file.
Oct 2 23:35:34 webdhcp2 dhcpd: Wrote 0 deleted host decls to leases file.
Oct 2 23:35:34 webdhcp2 dhcpd: Wrote 0 new dynamic host decls to leases file.
Oct 2 23:35:34 webdhcp2 dhcpd: Wrote 4634 leases to leases file. =====================>>>>> The original file has over 7000 entries
Oct 2 23:35:34 webdhcp2 dhcpd: Listening on LPF/eth7/fc:35:56:e0:00:8a/192.168.7.0/24
Oct 2 23:35:34 webdhcp2 dhcpd: Sending on LPF/eth7/fc:35:56:e0:00:8a/192.168.7.0/24
Oct 2 23:35:34 webdhcp2 dhcpd: Sending on Socket/fallback/fallback-net

Thanks

Alex P
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Pavel Zhukov

Re: Migration from ISC 4.4.1 to Red Hat dhcpd (ISC 4.1.1-P1)

Hello,
Rewind state has been added in dhcp-4.2+ [1]. Looks like you're using
RHEL6. You may want to update to RHEL7+ which ships dhcp-4.2.5
and includes support of rewind state.

"Pereida, Alejandro" <[hidden email]> writes:

> How can a dhcp server that has been working with ISC 4.4.1 be migrated to ISC 4.1.1-P1 (Red Hat supported version) without losing entries on the dhcpd.leases file?
>
> The dhcpd.conf file from the 4.4.1 version seems to run fine on
> 4.1.1-P1 but the dhcpd.leases file gets trimmed, the original
> dhcpd.leases file under 4.4.1 has about 3400 active leases and once
> the 4.1.1 is started it complains about "corrupt lease file" and trims
> it to a point where the dhcpd.leases file now shows only 350 active
> leases (almost 10 times less), here is the error we get once the
> 4.1.1-P1 server is started using a dhcpd.leases file that was produced
> with 4.4.1:
>
>
> First time 4.1.1-P1 is executed:
> Oct 2 23:34:45 webdhcp2 dhcpd: Corrupt lease file - possible data loss!
> Oct 2 23:34:45 webdhcp2 dhcpd: Corrupt lease file - possible data loss!
> Oct 2 23:34:45 webdhcp2 dhcpd: Corrupt lease file - possible data loss!
> Oct 2 23:34:45 webdhcp2 dhcpd: Corrupt lease file - possible data loss!
> Oct 2 23:34:45 webdhcp2 dhcpd: Corrupt lease file - possible data loss!
> Oct 2 23:34:45 webdhcp2 dhcpd: /var/lib/dhcpd/dhcpd.leases line 3208: Unexpected configuration directive.
> Oct 2 23:34:45 webdhcp2 dhcpd: rewind
> Oct 2 23:34:45 webdhcp2 dhcpd: ^
> Oct 2 23:34:45 webdhcp2 dhcpd: /var/lib/dhcpd/dhcpd.leases line 3208: possibly corrupt lease file
> Oct 2 23:34:45 webdhcp2 dhcpd: rewind binding state free;
> Oct 2 23:34:45 webdhcp2 dhcpd: ^
>
> Second time 4.1.1-P1 is executed:
> Oct 2 23:35:34 webdhcp2 dhcpd: Internet Systems Consortium DHCP Server 4.1.1-P1
> Oct 2 23:35:34 webdhcp2 dhcpd: Copyright 2004-2010 Internet Systems Consortium.
> Oct 2 23:35:34 webdhcp2 dhcpd: All rights reserved.
> Oct 2 23:35:34 webdhcp2 dhcpd: For info, please visit https://www.isc.org/software/dhcp/
> Oct 2 23:35:34 webdhcp2 dhcpd: WARNING: Host declarations are global. They are not limited to the scope you declared them in.
> Oct 2 23:35:34 webdhcp2 dhcpd: Not searching LDAP since ldap-server, ldap-port and ldap-base-dn were not specified in the config file
> Oct 2 23:35:34 webdhcp2 dhcpd: Wrote 0 class decls to leases file.
> Oct 2 23:35:34 webdhcp2 dhcpd: Wrote 0 deleted host decls to leases file.
> Oct 2 23:35:34 webdhcp2 dhcpd: Wrote 0 new dynamic host decls to leases file.
> Oct 2 23:35:34 webdhcp2 dhcpd: Wrote 4634 leases to leases file. =====================>>>>> The original file has over 7000 entries
> Oct 2 23:35:34 webdhcp2 dhcpd: Listening on LPF/eth7/fc:35:56:e0:00:8a/192.168.7.0/24
> Oct 2 23:35:34 webdhcp2 dhcpd: Sending on LPF/eth7/fc:35:56:e0:00:8a/192.168.7.0/24
> Oct 2 23:35:34 webdhcp2 dhcpd: Sending on Socket/fallback/fallback-net
>
> Thanks
>
> Alex P
> _______________________________________________
> dhcp-users mailing list
> [hidden email]
> https://lists.isc.org/mailman/listinfo/dhcp-users

[1] https://kb.isc.org/docs/aa-01099

--
PAVEL ZHUKOV
SOFTWARE ENGINEER, RHCE, RHCVA
Red Hat
[hidden email] IM: IRC: landgraf

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dhcp-users mailing list
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Pereida, Alejandro

RE: Migration from ISC 4.4.1 to Red Hat dhcpd (ISC 4.1.1-P1)

Thanks, will migrate to RHEL 7 then

-----Original Message-----
From: Pavel Zhukov <[hidden email]>
Sent: Wednesday, October 03, 2018 9:15 AM
To: Pereida, Alejandro <[hidden email]>
Cc: Users of ISC DHCP <[hidden email]>
Subject: Re: Migration from ISC 4.4.1 to Red Hat dhcpd (ISC 4.1.1-P1)

Hello,
Rewind state has been added in dhcp-4.2+ [1]. Looks like you're using RHEL6. You may want to update to RHEL7+ which ships dhcp-4.2.5 and includes support of rewind state.

"Pereida, Alejandro" <[hidden email]> writes:

> How can a dhcp server that has been working with ISC 4.4.1 be migrated to ISC 4.1.1-P1 (Red Hat supported version) without losing entries on the dhcpd.leases file?
>
> The dhcpd.conf file from the 4.4.1 version seems to run fine on
> 4.1.1-P1 but the dhcpd.leases file gets trimmed, the original
> dhcpd.leases file under 4.4.1 has about 3400 active leases and once
> the 4.1.1 is started it complains about "corrupt lease file" and trims
> it to a point where the dhcpd.leases file now shows only 350 active
> leases (almost 10 times less), here is the error we get once the
> 4.1.1-P1 server is started using a dhcpd.leases file that was produced
> with 4.4.1:
>
>
> First time 4.1.1-P1 is executed:
> Oct 2 23:34:45 webdhcp2 dhcpd: Corrupt lease file - possible data loss!
> Oct 2 23:34:45 webdhcp2 dhcpd: Corrupt lease file - possible data loss!
> Oct 2 23:34:45 webdhcp2 dhcpd: Corrupt lease file - possible data loss!
> Oct 2 23:34:45 webdhcp2 dhcpd: Corrupt lease file - possible data loss!
> Oct 2 23:34:45 webdhcp2 dhcpd: Corrupt lease file - possible data loss!
> Oct 2 23:34:45 webdhcp2 dhcpd: /var/lib/dhcpd/dhcpd.leases line 3208: Unexpected configuration directive.
> Oct 2 23:34:45 webdhcp2 dhcpd: rewind
> Oct 2 23:34:45 webdhcp2 dhcpd: ^
> Oct 2 23:34:45 webdhcp2 dhcpd: /var/lib/dhcpd/dhcpd.leases line 3208: possibly corrupt lease file
> Oct 2 23:34:45 webdhcp2 dhcpd: rewind binding state free;
> Oct 2 23:34:45 webdhcp2 dhcpd: ^
>
> Second time 4.1.1-P1 is executed:
> Oct 2 23:35:34 webdhcp2 dhcpd: Internet Systems Consortium DHCP
> Server 4.1.1-P1 Oct 2 23:35:34 webdhcp2 dhcpd: Copyright 2004-2010 Internet Systems Consortium.
> Oct 2 23:35:34 webdhcp2 dhcpd: All rights reserved.
> Oct 2 23:35:34 webdhcp2 dhcpd: For info, please visit
> https://www.isc.org/software/dhcp/
> Oct 2 23:35:34 webdhcp2 dhcpd: WARNING: Host declarations are global. They are not limited to the scope you declared them in.
> Oct 2 23:35:34 webdhcp2 dhcpd: Not searching LDAP since ldap-server,
> ldap-port and ldap-base-dn were not specified in the config file Oct 2 23:35:34 webdhcp2 dhcpd: Wrote 0 class decls to leases file.
> Oct 2 23:35:34 webdhcp2 dhcpd: Wrote 0 deleted host decls to leases file.
> Oct 2 23:35:34 webdhcp2 dhcpd: Wrote 0 new dynamic host decls to leases file.
> Oct 2 23:35:34 webdhcp2 dhcpd: Wrote 4634 leases to leases file. =====================>>>>> The original file has over 7000 entries
> Oct 2 23:35:34 webdhcp2 dhcpd: Listening on LPF/eth7/fc:35:56:e0:00:8a/192.168.7.0/24
> Oct 2 23:35:34 webdhcp2 dhcpd: Sending on LPF/eth7/fc:35:56:e0:00:8a/192.168.7.0/24
> Oct 2 23:35:34 webdhcp2 dhcpd: Sending on Socket/fallback/fallback-net
>
> Thanks
>
> Alex P
> _______________________________________________
> dhcp-users mailing list
> [hidden email]
> https://lists.isc.org/mailman/listinfo/dhcp-users