dhcpd.leases file missing old lease IP after each dhcpd restart

[P N Kumar]

Hi All,

Please help me on this issue which I have been working since long time.

We use ISC DHCP 4.2.8 server to assign fixed IP address to clients.

On the first config commit server leased out 6 IP address to 6 clients.

4.4.4.1  to  4.4.4.6

When I restart 1st time  ,DHCP "/etc/init.d/dhcp-server restart", I can see all 6 leases exist in dhcpd.lease file

2nd time restart misses first lease IP i.e. lease file has  4.4.4.2-4.4.4.6

3rd time restart  lease file has  4.4.4.3-4.4.4.6

...

...

5th time restart  lease file has  4.4.4.5-4.4.4.6

6th time restart  lease file has  4.4.4.6

but I can still ping 4.4.4.1 (or any other missing IP) from DHCP server.

Has anyone seen this behavior?

Thanks for your help in advance.

-Kumar

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[Fernando Soto]

Hi Kumar,

You may be hitting this issue that was fixed in dhcp 4.3.3:

- Move the check for a PID file and process to be before we rewrite the lease file.  This avoids the possibility of starting a second instance of a server which changes the current lease file confusing the first instance.  This check is only included if the admin hasn't disabled PID files.
  [ISC-Bugs #38078]
  [ISC-Bugs #38143]

Regards,

Fernando

On Thu, Nov 19, 2015 at 1:08 PM, Fernando Soto <[hidden email]> wrote:

 

 

From: [hidden email] [mailto:[hidden email]] On Behalf Of P N Kumar
Sent: Thursday, November 19, 2015 10:24 AM
To: [hidden email]
Subject: dhcpd.leases file missing old lease IP after each dhcpd restart

 

Hi All,

 

Please help me on this issue which I have been working since long time.

We use ISC DHCP 4.2.8 server to assign fixed IP address to clients.

 

On the first config commit server leased out 6 IP address to 6 clients.

4.4.4.1  to  4.4.4.6

 

When I restart 1st time  ,DHCP "/etc/init.d/dhcp-server restart", I can see all 6 leases exist in dhcpd.lease file

 

 

2nd time restart misses first lease IP i.e. lease file has  4.4.4.2-4.4.4.6

3rd time restart  lease file has  4.4.4.3-4.4.4.6

...

...

5th time restart  lease file has  4.4.4.5-4.4.4.6

6th time restart  lease file has  4.4.4.6

 

but I can still ping 4.4.4.1 (or any other missing IP) from DHCP server.

 

Has anyone seen this behavior?

 

Thanks for your help in advance.

 

 

-Kumar

 

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