dhcpd restart takes almost 7 minutes in CentOS7
Cayab, Jefrey E.
jcayab at gmail.com
Sun Nov 10 13:43:41 UTC 2019
Dear dhcp-users,
I have 110 dhcp scopes in my configuration file and everytime i restart
dhcpd service, it will take 7 minutes to complete - is this normal? Is
there a way to make it restart faster? Appreciate your help. Thank you
[root at dhcp ~]#
[root at dhcp ~]# grep VLAN /etc/dhcp/dhcpd.conf | wc -l
110
[root at dhcp ~]#
[root at dhcp ~]#
[root at dhcp ~]# cat /etc/*release
CentOS Linux release 7.6.1810 (Core)
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"
CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"
CentOS Linux release 7.6.1810 (Core)
CentOS Linux release 7.6.1810 (Core)
[root at dhcp ~]#
[root at dhcp ~]#
[root at dhcp ~]# rpm -qi dhcp
Name : dhcp
Epoch : 12
Version : 4.2.5
Release : 77.el7.centos
Architecture: x86_64
Install Date: Tue 01 Oct 2019 04:14:37 AM +08
Group : System Environment/Daemons
Size : 1449595
License : ISC
Signature : RSA/SHA256, Fri 23 Aug 2019 05:22:17 AM +08, Key ID
24c6a8a7f4a80eb5
Source RPM : dhcp-4.2.5-77.el7.centos.src.rpm
Build Date : Fri 09 Aug 2019 07:10:22 AM +08
Build Host : x86-01.bsys.centos.org
Relocations : (not relocatable)
Packager : CentOS BuildSystem <http://bugs.centos.org>
Vendor : CentOS
URL : http://isc.org/products/DHCP/
Summary : Dynamic host configuration protocol software
Description :
DHCP (Dynamic Host Configuration Protocol) is a protocol which allows
individual devices on an IP network to get their own network
configuration information (IP address, subnetmask, broadcast address,
etc.) from a DHCP server. The overall purpose of DHCP is to make it
easier to administer a large network.
To use DHCP on your network, install a DHCP service (or relay agent),
and on clients run a DHCP client daemon. The dhcp package provides
the ISC DHCP service and relay agent.
[root at dhcp ~]#
[root at dhcp ~]#
[root at dhcp ~]# sestatus
SELinux status: enabled
SELinuxfs mount: /sys/fs/selinux
SELinux root directory: /etc/selinux
Loaded policy name: targeted
Current mode: enforcing
Mode from config file: enforcing
Policy MLS status: enabled
Policy deny_unknown status: allowed
Max kernel policy version: 31
[root at dhcp ~]#
[root at dhcp ~]# mount
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime,seclabel)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
devtmpfs on /dev type devtmpfs
(rw,nosuid,seclabel,size=3974540k,nr_inodes=993635,mode=755)
securityfs on /sys/kernel/security type securityfs
(rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev,noexec,seclabel,size=5242880k)
devpts on /dev/pts type devpts
(rw,nosuid,noexec,relatime,seclabel,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,nodev,seclabel,mode=755)
tmpfs on /sys/fs/cgroup type tmpfs
(ro,nosuid,nodev,noexec,seclabel,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup
(rw,nosuid,nodev,noexec,relatime,seclabel,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd)
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup
(rw,nosuid,nodev,noexec,relatime,seclabel,cpuacct,cpu)
cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup
(rw,nosuid,nodev,noexec,relatime,seclabel,net_prio,net_cls)
cgroup on /sys/fs/cgroup/cpuset type cgroup
(rw,nosuid,nodev,noexec,relatime,seclabel,cpuset)
cgroup on /sys/fs/cgroup/freezer type cgroup
(rw,nosuid,nodev,noexec,relatime,seclabel,freezer)
cgroup on /sys/fs/cgroup/perf_event type cgroup
(rw,nosuid,nodev,noexec,relatime,seclabel,perf_event)
cgroup on /sys/fs/cgroup/hugetlb type cgroup
(rw,nosuid,nodev,noexec,relatime,seclabel,hugetlb)
cgroup on /sys/fs/cgroup/memory type cgroup
(rw,nosuid,nodev,noexec,relatime,seclabel,memory)
cgroup on /sys/fs/cgroup/pids type cgroup
(rw,nosuid,nodev,noexec,relatime,seclabel,pids)
cgroup on /sys/fs/cgroup/devices type cgroup
(rw,nosuid,nodev,noexec,relatime,seclabel,devices)
cgroup on /sys/fs/cgroup/blkio type cgroup
(rw,nosuid,nodev,noexec,relatime,seclabel,blkio)
configfs on /sys/kernel/config type configfs (rw,relatime)
/dev/mapper/vg00-lvroot on / type xfs
(rw,noatime,nodiratime,seclabel,attr2,inode64,noquota)
selinuxfs on /sys/fs/selinux type selinuxfs (rw,relatime)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs
(rw,relatime,fd=35,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=20052)
debugfs on /sys/kernel/debug type debugfs (rw,relatime)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime,seclabel)
mqueue on /dev/mqueue type mqueue (rw,relatime,seclabel)
/dev/sda2 on /boot type xfs
(rw,noatime,nodiratime,seclabel,attr2,discard,nobarrier,inode64,logbufs=8,noquota)
/dev/mapper/vg00-lvhome on /home type xfs
(rw,nodev,noatime,nodiratime,seclabel,attr2,discard,nobarrier,inode64,logbufs=8,noquota)
/dev/mapper/vg00-lvtmp on /tmp type xfs
(rw,nosuid,nodev,noexec,noatime,nodiratime,seclabel,attr2,discard,nobarrier,inode64,logbufs=8,noquota)
/dev/mapper/vg00-lvvar on /var type xfs
(rw,nosuid,nodev,noexec,noatime,nodiratime,seclabel,attr2,discard,nobarrier,inode64,logbufs=8,noquota)
/dev/mapper/vg00-lvvartmp on /var/tmp type xfs
(rw,nosuid,nodev,noexec,noatime,nodiratime,seclabel,attr2,discard,nobarrier,inode64,logbufs=8,noquota)
/dev/mapper/vg00-lvvarlog on /var/log type xfs
(rw,nosuid,nodev,noexec,noatime,nodiratime,seclabel,attr2,discard,nobarrier,inode64,logbufs=8,noquota)
/dev/mapper/vg00-lvaudit on /var/log/audit type xfs
(rw,nosuid,nodev,noexec,noatime,nodiratime,seclabel,attr2,discard,nobarrier,inode64,logbufs=8,noquota)
tmpfs on /run/user/1000 type tmpfs
(rw,nosuid,nodev,relatime,seclabel,size=797300k,mode=700,uid=1000,gid=1000)
[root at dhcp ~]#
[root at dhcp ~]#
logs when "systemctl restart dhcpd" is executed:
[root at dhcp ~]#
[root at dhcp ~]# tail -f /var/log/messages
Nov 10 21:16:56 dhcp polkitd[5349]: Registered Authentication Agent for
unix-process:5937:354512872 (system bus name :1.30076 [/usr/bin/pkttyagent
--notify-fd 5 --fallback], object path
/org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
Nov 10 21:16:56 dhcp systemd: Stopping DHCPv4 Server Daemon...
Nov 10 21:16:56 dhcp systemd: Stopping DHCPv4 Server Daemon...
Nov 10 21:16:56 dhcp named[243904]: resolver priming query complete
Nov 10 21:16:56 dhcp named[243904]: resolver priming query complete
Nov 10 21:16:56 dhcp systemd: Stopped DHCPv4 Server Daemon.
Nov 10 21:16:56 dhcp systemd: Stopped DHCPv4 Server Daemon.
Nov 10 21:16:56 dhcp systemd: Starting DHCPv4 Server Daemon...
Nov 10 21:16:56 dhcp systemd: Starting DHCPv4 Server Daemon...
Nov 10 21:16:56 dhcp dhcpd: Internet Systems Consortium DHCP Server 4.2.5
Nov 10 21:16:56 dhcp dhcpd: Internet Systems Consortium DHCP Server 4.2.5
Nov 10 21:16:56 dhcp dhcpd: Copyright 2004-2013 Internet Systems Consortium.
Nov 10 21:16:56 dhcp dhcpd: Copyright 2004-2013 Internet Systems Consortium.
Nov 10 21:16:56 dhcp dhcpd: All rights reserved.
Nov 10 21:16:56 dhcp dhcpd: All rights reserved.
Nov 10 21:16:56 dhcp dhcpd: For info, please visit
https://www.isc.org/software/dhcp/
Nov 10 21:16:56 dhcp dhcpd: For info, please visit
https://www.isc.org/software/dhcp/
Nov 10 21:16:56 dhcp dhcpd: Warning: subnet 192.168.88.0/24 overlaps subnet
0.0.0.0/-26
Nov 10 21:16:56 dhcp dhcpd: Warning: subnet 192.168.88.0/24 overlaps subnet
0.0.0.0/-26
Nov 10 21:17:12 dhcp dhcpd: WARNING: Host declarations are global. They
are not limited to the scope you declared them in.
Nov 10 21:17:12 dhcp dhcpd: WARNING: Host declarations are global. They
are not limited to the scope you declared them in.
Nov 10 21:17:12 dhcp dhcpd: Not searching LDAP since ldap-server, ldap-port
and ldap-base-dn were not specified in the config file
Nov 10 21:17:12 dhcp dhcpd: Not searching LDAP since ldap-server, ldap-port
and ldap-base-dn were not specified in the config file
Nov 10 21:17:12 dhcp dhcpd: Internet Systems Consortium DHCP Server 4.2.5
Nov 10 21:17:12 dhcp dhcpd: Internet Systems Consortium DHCP Server 4.2.5
Nov 10 21:17:12 dhcp dhcpd: Copyright 2004-2013 Internet Systems Consortium.
Nov 10 21:17:12 dhcp dhcpd: Copyright 2004-2013 Internet Systems Consortium.
Nov 10 21:17:12 dhcp dhcpd: All rights reserved.
Nov 10 21:17:12 dhcp dhcpd: All rights reserved.
Nov 10 21:17:12 dhcp dhcpd: For info, please visit
https://www.isc.org/software/dhcp/
Nov 10 21:17:12 dhcp dhcpd: For info, please visit
https://www.isc.org/software/dhcp/
Nov 10 21:23:12 dhcp dhcpd: Wrote 0 class decls to leases file.
Nov 10 21:23:12 dhcp dhcpd: Wrote 0 class decls to leases file.
Nov 10 21:23:12 dhcp dhcpd: Wrote 0 deleted host decls to leases file.
Nov 10 21:23:12 dhcp dhcpd: Wrote 0 deleted host decls to leases file.
Nov 10 21:23:12 dhcp dhcpd: Wrote 0 new dynamic host decls to leases file.
Nov 10 21:23:12 dhcp dhcpd: Wrote 0 new dynamic host decls to leases file.
Nov 10 21:23:13 dhcp dhcpd: Wrote 60199 leases to leases file.
Nov 10 21:23:13 dhcp dhcpd: Wrote 60199 leases to leases file.
Nov 10 21:23:13 dhcp dhcpd: Listening on LPF/eth0/50:6b:8d:03:a8:b9/
0.0.0.0/0
Nov 10 21:23:13 dhcp dhcpd: Sending on LPF/eth0/50:6b:8d:03:a8:b9/
0.0.0.0/0
Nov 10 21:23:13 dhcp dhcpd: Sending on Socket/fallback/fallback-net
Nov 10 21:23:13 dhcp systemd: Started DHCPv4 Server Daemon.
Nov 10 21:23:13 dhcp dhcpd: Listening on LPF/eth0/50:6b:8d:03:a8:b9/
0.0.0.0/0
Nov 10 21:23:13 dhcp dhcpd: Sending on LPF/eth0/50:6b:8d:03:a8:b9/
0.0.0.0/0
Nov 10 21:23:13 dhcp dhcpd: Sending on Socket/fallback/fallback-net
Nov 10 21:23:13 dhcp systemd: Started DHCPv4 Server Daemon.
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