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To avoid port conflicts with services such as CUPS or IMAP dhcp 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 - 754): 1) Create a file named after the service, for example 'krb5_prop', which contains: krb5_prop/tcp 2) In the spec, install this file in /etc/portreserve, i.e., /etc/portreserve/krb5_prop 3) In the spec, add 'Requires: portreserve' to the package that provides the server. 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 dhcp-failover dhcp-failover2 contents of relevant part of /etc/init.d/dhcp: start() { [ `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. http://rhn.redhat.com/errata/RHBA-2012-0793.html