Create Custom App with multiple containers

TrueNAS General
1

Hi,

How can I create a custom app that has multiple containers?

2

Use docker compose in a sandbox. In the future you’ll be able to use that compose file with TrueNAS Electric Eel

TrueNAS Scale: Setting up Sandboxes with Jailmaker

3

I don’t think you can create a custom app with multiple containers. That being said, you can create a container via docker build that has multiple things in it with supervisord, etc, so, multiple daemons iow. The docker built container then is trivially run as a custom app.

That is, until Electric Eel release which will use compose. Or, you can go the jail route now.

4

Aren’t TrueNAS apps based on Kubernetes and Helm charts?

I was hoping I could use it.

As off today’s updates (24.04) I can’t create new custom apps:

[ENOENT] Unable to locate ‘ix-chart’ at ‘/mnt/Storage Pool 0/ix-applications/catalogs/github_com_truenas_charts_git_master/charts/ix-chart’

5

They are Kubernetes at present, however, what actually rjuns behind the “custom app” is containerd, which runs any ol container built by docker and others.

6

The Home Assistant app seems to be using a helm chart to use 2 containers:

image
image811×716 36.7 KB

I want to do something like this.

7

Although you could make a custom helm
Chart, that functionality is deprecated. And going away in Electric Eel, to be replaced with docker compose.

In the meantime, you can use docker compose in a sandbox.

See my previous post.

8

You can, just learn to do docker and build your own until Eel when compose makes it easier. No need for helm. You’ll need to use/include something like supervisord to run multiple apps within the built container.