Can't open lease database /dev/shm/dhcpd/dhcpd.leases: Permission denied --

[Simon Hobson]

18905913309 wrote:

>i stopped the dhcpd service autostart,and add the following line to 
>/etc/rc.local:
>    cp /var/lib/dhcpd/dhcpd.leases /tmp/dhcpd.leases
>    /sbin/dhcpd -lf /tmp/dhcpd.leases
>
>then,i reboot system,but dhcpd didnt start.
>i found a messages in system log files:
>      Can't open lease database /tmp/dhcpd/dhcpd.leases: Permission denied --
>
>but if i run the two lines by manual,it can work.
>
>#  cp /var/lib/dhcpd/dhcpd.leases /tmp/dhcpd.leases
># /sbin/dhcpd -lf /tmp/dhcpd.leases

Have you looked at the permissions of the source and copied files ? 
That might just give you a clue ! You might want to add the "-p" flag 
to cp to preserve permissions.

Also, there are inconsistencies :
/tmp/dhcpd/dhcpd.leases is different to /tmp/dhcpd.leases and both 
are different to /dev/shm/dhcpd/dhcpd.leases - is that just a copy & 
paste error while you've been experimenting ?

I trust you've also modified your scripts to copy the leases file 
back again before stopping the daemon ? Even so, putting the leases 
file somewhere volatile (/dev/shm/dhcpd/dhcpd.leases) is very 
dangerous since if you lose the leases file your server has no memory 
of promises it made in the past and that can lead to a world of hurt.

-- 
Simon Hobson

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