[EXT] Re: dhcpd restart takes almost 7 minutes in CentOS7
Anderson, Charles R
cra at wpi.edu
Sun Nov 10 14:45:47 UTC 2019
There is something seriously wrong with your config file. It is saying you have a subnet defined 0.0.0.0/-26 (i.e. a negative prefix length). Please post your config file.
> 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
This is a less serious problem, but you should make your host { } statements in global scope (not inside subnets or other objects):
> 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.
On Sun, Nov 10, 2019 at 09:38:48AM -0500, Andrew Bell wrote:
> No, that's not even close to normal. I have about 20000 leases in 70 VLANs
> and my restart is less than 15 seconds.
>
> Looking at the startup log, it seems that you have two instances running
> and being restarted at the same time. That's what you need to look at
> first, I think.
>
> On Sun, Nov 10, 2019 at 8:44 AM Cayab, Jefrey E. <jcayab at gmail.com> wrote:
>
> > 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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