Red Hat Bugzilla – Bug 790686
dhcp should be using portreserve
Last modified: 2012-06-20 08:43:54 EDT
To avoid port conflicts with services such as CUPS or IMAP
should be using portreserve for reserving respective ports
within range 600 - 1023. According to /etc/services dhcp
might be using port withing this range.
Typical changes required:
Given a SysV service package that uses a particular port, (say, krb5_prop/tcp -
1) Create a file named after the service, for example 'krb5_prop', which
2) In the spec, install this file in /etc/portreserve, i.e.,
3) In the spec, add 'Requires: portreserve' to the package that provides the
4) In the init script, in the start() stanza, add:
[ -x /sbin/portrelease ] && /sbin/portrelease krb5_prop &>/dev/null || :
before starting the daemon.
Some background can be found in bug 103401.
Verified on RHEL6.3-20120411.1_nfs-Server, dhcp-4.1.1-30.P1.el6.x86_64.
# cat /etc/portreserve/dhcpd
contents of relevant part of /etc/init.d/dhcp:
[ `id -u` -eq 0 ] || return 4
[ -x $exec ] || return 5
[ -f $config ] || return 6
rh_status_q && return 0
echo -n $"Starting $prog: "
# tell portreserve to release the port
[ -x /sbin/portrelease ] && /sbin/portrelease dhcpd &>/dev/null || :
daemon --pidfile=$pidfile $exec -user $user -group $group $DHCPDARGS 2>/dev/null
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.