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Re: [mosquitto-dev] save mosquitto.db for running instance if persistance if false
Roger et al

That strikes me as an amazingly well written bit of software to support that.

Very impressive.

Paul

On 18 August 2016 at 03:07, John Harrison <john@xxxxxxxxxxx> wrote:
Works! :-)

Seems you don't need the SIGUSR1. Once the process saw the SIGHUP it reloaded the config file then saved the database.

Thank you,

-John


On Wed, Aug 17, 2016 at 8:58 AM, Roger Light <roger@xxxxxxxxxx> wrote:
Hi John,

I forgot to mention that you'd have to send a SIGHUP to the broker
first to tell it to reload the config.

Cheers,

Roger



On Mon, Aug 15, 2016 at 7:35 PM, John Harrison <john@xxxxxxxxxxx> wrote:
> I am already using a config file but I just tried this and it doesn't seem
> to be working for me. I changed the line in the config file from
> persistence false
> to
> persistence true
>
> then found the PID of the mosquitto service and sent it:
> sudo kill -SIGUSR1 MOSQUITTO_PID
>
> the log file shows:
> Error in poll: Interrupted system call.
>
> and no mosquitto.db was written.
>
> I know my settings are OK because I then stopped and restarted the mosquitto
> service. With the new setting of persistence in the config file a
> mosquitto.db file was created when the service was stopped.
>
> mosquitto version 1.4.9 (build date Fri, 17 Jun 2016 15:43:08 +0100)
>
> This was all done on a test service. I have a prod service on another server
> and that's the one I am concerned about.
>
> -John
>
>
>
>
>
> On Sat, Apr 30, 2016 at 4:40 PM, Roger Light <roger@xxxxxxxxxx> wrote:
>>
>> Hi John,
>>
>> If you're using a config file already, then changing the config file
>> to include "persistence true" and sending a signal SIGUSR1 should do
>> the job.
>>
>> If you're not using a config file then your only hope is to modify
>> db->config->persistence to be non-zero using a debugger. I've not
>> tried it, but it should work - although you'd need debug symbols.
>>
>> Cheers,
>>
>> Roger
>>
>>
>>
>> On Sat, Apr 30, 2016 at 4:47 PM, John Harrison <john@xxxxxxxxxxx> wrote:
>> > Is there any way to save the mosquitto.db configuration for a running
>> > instance of mosquitto where persistence was set to false?
>> >
>> >
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>
>
>
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--
Paul Fremantle
Part-time PhD student - School of Computing
twitter: pzfreo / skype: paulfremantle / blog: http://pzf.fremantle.org
Co-Founder, WSO2
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