Gracefully shutdown dhcpd

[Shraddha Pandhe]

Hi,

Is there a way to gracefully shutdown DHCPD using a signal?

I see that dhcpd supports following states:

enum dhcp_shutdown_state {

shutdown_listeners,

shutdown_omapi_connections,

shutdown_drop_omapi_connections,

shutdown_dhcp,

shutdown_done

};

Is there a way to follow these states, without using OMAPI connection?

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[Bob Harold]

On Tue, Jun 23, 2015 at 7:24 PM, Shraddha Pandhe <[hidden email]> wrote:

Hi,

Is there a way to gracefully shutdown DHCPD using a signal?

I see that dhcpd supports following states:

enum dhcp_shutdown_state {

shutdown_listeners,

shutdown_omapi_connections,

shutdown_drop_omapi_connections,

shutdown_dhcp,

shutdown_done

};

Is there a way to follow these states, without using OMAPI connection?

From the man page:

"To restart dhcpd, send a SIGTERM (signal 15) to the process ID contained in RUNDIR/dhcpd.pid, and then re-invoke dhcpd."

Sounds to me like  kill -TERM is a graceful shutdown for dhcpd.

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[Shraddha Pandhe]

Hi Bob,

Thanks for responding. I tried out SIGTERM. Here are my findings.

When I follow the omshell way of graceful shutdown [1], I see following in dhcpd logs. This seems like graceful shutdown. But when I do `kill -15 <pid>` I don't see any such log. Is there a way to verify that dhcpd has shutdown gracefully?

Jun 24 17:26:32 painedingrained dhcpd: Disabling output on LPF/eth0/fa:16:3e:0c:f2:ef/**.**.**.**/**

Jun 24 17:26:32 painedingrained dhcpd: Disabling input on LPF/eth0/fa:16:3e:0c:f2:ef/**.**.**.**/**

​

[1]  omshell

> server 127.0.0.1

> port 8080

> connect

obj: <null>

> new control

obj: control

> open

obj: control

state = 00:00:00:00

> set state = 2

obj: control

state = 2

> update

can't update object: connection reset by peer

obj: control

state = 2

> 

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[Bob Harold]

On Wed, Jun 24, 2015 at 1:30 PM, Shraddha Pandhe <[hidden email]> wrote:

Hi Bob,

Thanks for responding. I tried out SIGTERM. Here are my findings.

When I follow the omshell way of graceful shutdown [1], I see following in dhcpd logs. This seems like graceful shutdown. But when I do `kill -15 <pid>` I don't see any such log. Is there a way to verify that dhcpd has shutdown gracefully?

Jun 24 17:26:32 painedingrained dhcpd: Disabling output on LPF/eth0/fa:16:3e:0c:f2:ef/**.**.**.**/**

Jun 24 17:26:32 painedingrained dhcpd: Disabling input on LPF/eth0/fa:16:3e:0c:f2:ef/**.**.**.**/**

​

[1]  omshell

> server 127.0.0.1

> port 8080

> connect

obj: <null>

> new control

obj: control

> open

obj: control

state = 00:00:00:00

> set state = 2

obj: control

state = 2

> update

can't update object: connection reset by peer

obj: control

state = 2

> 

I don't know.  Hopefully someone else can help.

Bob Harold

 

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[Shraddha Pandhe]

Thanks Bob!

On Wed, Jun 24, 2015 at 11:26 AM, Bob Harold <[hidden email]> wrote:

On Wed, Jun 24, 2015 at 1:30 PM, Shraddha Pandhe <[hidden email]> wrote:

Hi Bob,

Thanks for responding. I tried out SIGTERM. Here are my findings.

When I follow the omshell way of graceful shutdown [1], I see following in dhcpd logs. This seems like graceful shutdown. But when I do `kill -15 <pid>` I don't see any such log. Is there a way to verify that dhcpd has shutdown gracefully?

Jun 24 17:26:32 painedingrained dhcpd: Disabling output on LPF/eth0/fa:16:3e:0c:f2:ef/**.**.**.**/**

Jun 24 17:26:32 painedingrained dhcpd: Disabling input on LPF/eth0/fa:16:3e:0c:f2:ef/**.**.**.**/**

​

[1]  omshell

> server 127.0.0.1

> port 8080

> connect

obj: <null>

> new control

obj: control

> open

obj: control

state = 00:00:00:00

> set state = 2

obj: control

state = 2

> update

can't update object: connection reset by peer

obj: control

state = 2

> 

I don't know.  Hopefully someone else can help.

Bob Harold

 

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