[Pdns-users] What signal to tell PDNS to shut down?
nicholas at nicholaswilliams.net
Tue Jan 15 21:22:44 UTC 2019
Ah! Thanks, everyone! Using `--init` did, indeed, solve all my problems. Super helpful! Learn something new every day I suppose. :-)
> On Jan 13, 2019, at 5:05 PM, frank+pdns--- via Pdns-users <pdns-users at mailman.powerdns.com> wrote:
> Hi Bert and Nick,
> Docker will issue a SIGTERM, and assumes an app responds to that. It is up to the container to “do what’s needed” upon receiving a SIGTERM. So it’s best practice to make sure SIGTERM does the right thing…. When using Docker, you should expect your container to be started, stopped, restarted elsewhere etc.
> Nick: As Brian said: use tini either in your Dockerfile, or when starting the container by using the --init parameter…
>> On 13 Jan 2019, at 21:48, bert hubert <bert.hubert at powerdns.com> wrote:
>> On Sun, Jan 13, 2019 at 08:32:33PM +0000, Brian Candler wrote:
>>>> sends a `SIGTERM` to PID 1, waits some amount of time, and then sends
>>>> SIGKILL to force it to stop. It’s having to resort to SIGKILL, because
>>>> `pdns_server` doesn’t respond to `SIGTERM`. What is the correct signal to
>>>> tell PDNS to shut down?
>>> The problem is not with pdns, it's with docker: strange things happen if you
>>> run the application as pid 1. For an explanation see: https://hackernoon.com/my-process-became-pid-1-and-now-signals-behave-strangely-b05c52cc551c
>> In addition, you could ask powerdns to stop using pdns_control.
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