Weird problem of multiple dhcp processes running in parallel!

[perl-list]

it shouldn't be able to do that because port 67 would already be in use... The kernel should prevent it. But I see you are using chroot and so on that I am not familiar with and how that would affect things. 

> From: "karteek challa" <karteek.challa at wipro.com>
> To: dhcp-users at lists.isc.org
> Cc: dhcp-users at lists.isc.org
> Sent: Tuesday, November 15, 2016 12:00:29 PM
> Subject: Re: Weird problem of multiple dhcp processes running in parallel!

> Hi,

> I've reproduced the issue by restarting the dhcpd service exactly at the same
> time from 2 different hosts which had resulted in 2 dhcp processes listening on
> eth0 interface.

> # ps -ef | grep dhcp
> root 1284 1 0 Oct23 ? 02:01:27 /sbin/syslog-ng -a /var/lib/dhcp/dev/log -a
> /var/lib/dhcp6/dev/log -a /var/lib/named/dev/log
> dhcpd 18976 1 0 14:01 ? 00:00:00 /usr/sbin/dhcpd -4 -cf /etc/dhcpd.conf -pf
> /var/run/dhcpd.pid -chroot /var/lib/dhcp -lf /db/dhcpd.leases -user dhcpd
> -group nogroup eth0
> dhcpd 18978 1 0 14:01 ? 00:00:00 /usr/sbin/dhcpd -4 -cf /etc/dhcpd.conf -pf
> /var/run/dhcpd.pid -chroot /var/lib/dhcp -lf /db/dhcpd.leases -user dhcpd
> -group nogroup eth0
> root 29484 26297 0 14:02 pts/2 00:00:00 grep dhcp

> Is this a bug?

> Best Regards,
> Karteek

> From: Karteek Challa (Communications-Telecom Equipment)
> Sent: 11 November 2016 04:01
> To: dhcp-users at lists.isc.org
> Subject: Weird problem of multiple dhcp processes running in parallel!

> Hi Friends,

> I am facing a weird problem with the multiple dhcp process running in parallel.

> My dhcp server was configured to listen on only one eth0 and th ere used to be
> only one process running always.

> But because of some inconsistent behaviour in hosts not getting IPs, when
> observed the linux machine with the dhcp server installed, I observed 5 dhcp
> process running in parallel.

> DHCPv4 server running in my linux machine.

> dhcpd 1934 1.2 0.2 34844 8744 ? Ss 16:25 4:59 /usr/sbin/dhcpd -4 -cf
> /etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot /var/lib/dhcp -lf
> /db/dhcpd.leases -user dhcpd -group nogroup eth0
> dhcpd 19095 1.2 0.2 34972 8756 ? Ss Nov09 26:12 /usr/sbin/dhcpd -4 -cf
> /etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot /var/lib/dhcp -lf
> /db/dhcpd.leases -user dhcpd -group nogroup eth0
> dhcpd 19349 1.2 0.2 34840 8728 ? Ss Nov09 26:01 /usr/sbin/dhcpd -4 -cf
> /etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot /var/lib/dhcp -lf
> /db/dhcpd.leases -user dhcpd -group nogroup eth0
> dhcpd 20649 1.1 0.2 34840 8728 ? Ss Nov09 24:41 /usr/sbin/dhcpd -4 -cf
> /etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot /var/lib/dhcp -lf
> /db/dhcpd.leases -user dhcpd -group nogroup eth0
> dhcpd 21533 1.1 0.2 34840 8736 ? Ss Nov09 24:07 /usr/sbin/dhcpd -4 -cf
> /etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot /var/lib/dhcp -lf
> /db/dhcpd.leases -user dhcpd -group nogroup eth0

> May I know in what scenario multiple dhcp processes will be created?

> Best Regards,

> Karteek

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