How to start an app from a shell

[gordon19284]

I'm sure this is straightforward but I'm still very new to Kubernetes. I have an app set up and ready to go, and I want to be able to SSH in and start it using the existing configuration without using the web UI.

 

[aussiejuggalo]

I could be wrong but I'm pretty sure you cant do much from CLI as far as Kubernetes / Helm is concerned.

IX prefers you to use the GUI so if anything goes wrong they can provide support. FreeNAS, Core & Scale are pretty locked down.

 

[sretalla]

I have an app set up and ready to go, and I want to be able to SSH in and start it using the existing configuration without using the web UI.

What you're probably wanting/needing is the API call using the middleware...

The one I think is relevant would be:

midclt call chart.release.scale ...

Seems to me the arguments would be '{ "release_name": appname, "scale_options.replica_count": 0 }'

But for the life of me, I can't seem to get that to work... maybe someone from iX can step in and point out the elusive correct syntax.

Obviously the scale of 0 is to stop it... (which is what the stop button does in kubernetes terms... scaling the app to 0 replicas), so 1 would be to start it.

 

[adorobis]

Accessing the Shell in an Active Container
To access the shell in an active container, first identify the namespace and pod for the container. In the Scale UI, go to System Settings > Shell to begin entering commands:

1. View container namespaces: k3s kubectl get namespaces.
2. View pods by namespace: k3s kubectl get -n <NAMESPACE> pods.
3. Access container shell: k3s kubectl exec -n <NAMESPACE> --stdin --tty <POD> -- /bin/bash.

from: https://www.truenas.com/community/threads/accessing-a-container-from-the-cli.95733/

 

[sretalla]

Accessing the Shell in an Active Container

That's good information (coming from a reliable source ;) ), but it doesn't answer the question that was asked.

What is desired is to start or stop an "App" from the CLI, not how to connect to the SSH console of that "App"'s container.

 

[adorobis]

Oh, sorry, didn't pay attention to detail :) I have found some info here but I could not make it work so far as I can't see any deployments for my app.

Starting and restrting Apps from cli

What is the proper way to start the app on system start? I can put something like 'docker start 7dda08892103' to init script for simple docker app, but what will I do for something like Prometheus truechart app that consists of 4 containers? Same question for cron restarts.

www.truenas.com

 

[ksimm1]

midclt call chart.release.scale [appname] '{"replica_count": 1}'

 

[adorobis]

@ksimm1 many thanks, works perfectly!

 

[sretalla]

midclt call chart.release.scale [appname] '{"replica_count": 1}'

Can't seem to make it work... can you share how you identified the appname?

 

[adorobis]

how you identified the appname

In my case this is exactly the name I have defined in the Apps config

 

[sretalla]

Well, I tried with that... and with variations with ix-appname and appname-595b7ff775-qwst7, no cigar (at least not for me... good it works for you).

 

[adorobis]

You can try to see if it has a different name listing all services: k3s kubectl get service --all-namespaces

 

[sretalla]

You can try to see if it has a different name listing all services: k3s kubectl get service --all-namespaces

That just gives me back appname and ix-appname. I had already used k3s kubectl get pods,svc,daemonsets,deployments,statefulset,sc,pvc,ns,job --all-namespaces -o wide . Thanks for the thought though.

 

[patan32]

midclt call chart.release.scale [appname] '{"replica_count": 1}'

Thanks for this.