Weird problem of multiple dhcp processes running in parallel!
karteek.challa at wipro.com
karteek.challa at wipro.com
Tue Nov 15 17:00:29 UTC 2016
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 there 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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