reloading vs restarting nomad

[Ilin T]

Hello,

Is it necessary to restart nomad on configuration change or reloading is enough? Is there a way to reconfigure the nomad cluster without causing restarts of the jobs?

regards,
ilin

[Mathias Lafeldt]

Hi Ilin,

The only configuration setting Nomad can reload on SIGHUP is retry_join in server mode. See https://github.com/hashicorp/nomad/pull/1566

AFAIK, all other changes require restarting of the agent.

-Mathias

https://tinyletter.com/production-ready

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[Diptanu Choudhury]

Restarting an agent with configuration changes shouldn't restart jobs which are running.

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Thanks,
Diptanu Choudhury

Web - www.linkedin.com/in/diptanu

Twitter - @diptanu

[Ilin T]

On Monday, 22 August 2016 18:37:51 UTC+2, Diptanu Choudhury wrote:

Restarting an agent with configuration changes shouldn't restart jobs which are running.

OK thank you guys

[Cameron Davison]

"Restarting an agent with configuration changes shouldn't restart jobs which are running." is this still true? I have never been able to restart the server and not have that kill all the plugins processes.

[Diptanu Choudhury]

Yeah this is still true. Please provide us steps to reproduce this.

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[Tarpan Pathak]

Hi Diptanu,

We are in the process of integrating Vault in Nomad. As an initial step, I have a added the Vault config in the Nomad (client) config. What is the best way to restart the Nomad client for it to pick up this configuration change? I think that a "kill SIGHUP <pid>" may be sufficient but could you please confirm? 

On Thursday, December 29, 2016 at 6:30:57 PM UTC-8, Diptanu Choudhury wrote:

Yeah this is still true. Please provide us steps to reproduce this.

On Thu, Dec 29, 2016 at 9:52 AM, Cameron Davison <cameron...@gmail.com> wrote:

"Restarting an agent with configuration changes shouldn't restart jobs which are running." is this still true? I have never been able to restart the server and not have that kill all the plugins processes.

On Tuesday, August 23, 2016 at 1:36:33 AM UTC-5, Ilin T wrote:

On Monday, 22 August 2016 18:37:51 UTC+2, Diptanu Choudhury wrote:

Restarting an agent with configuration changes shouldn't restart jobs which are running.

OK thank you guys

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[Alex Dadgar]

Hey Tarpan,

The Nomad servers support reloading their Vault configuration but the clients do not. As such you should do a SIGINT and restart the Nomad client.

Thanks,
Alex Dadgar

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[Tarpan Pathak]

Thanks Alex.

The error that I'm trying to fix is this: 

"Error submitting job: Unexpected response code: 500 (rpc error: Vault not enabled and Vault policies requested)". 

To test and avoid downtime, I performed a SIGINT and restarted a single Nomad (client) which seems to have worked. I'm now going to enable Vault on the remaining Nomad cluster (3 servers, 2 clients) nodes by updating the corresponding "server.hcl" and "client.hcl" file. Once the config is applied, I will perform a SIGHUP (on the servers) and a SIGINT (on the clients). Assuming Nomad starts up without any issues, I will submit a job that requires a Vault policy and verify the results.