Dears
I have HA container in docker in synology NAS. I understand we do not necesserly need add-ons as not present in this version but we can use Docker containers as add-ons. The fact is that I really cannot find the metodology to connect additional containers eventually downloaded in my docker to HA. Do you know any guide for this aim? maybe a link to a video or tutorial.
Option is to install VM in NAS and OS HA version but i do not know if it worths
Thanks in advance
Add-ons in HAOS are in fact also containers but more integrated/maintained. This assists users that are not knowledgeable/interested to manage these.
If you chose for a docker install then these ‘add-ons’ you would have to add yourselves as a container, each with its config/updates/etc. and without HAOS pointing you to update
If you are not into docker/containers by (lets call it) nature, then choose VM/HAOS solution which will reduce the technical bits.
Myself, I remain a fan of docker, I am able to up- or downgrade each container (add-on) at any time of day without waiting for others to do so for HAOS…but in reality, probably 95%+ of HA users donot need or want this
And he actually asked how to do that 
thanks @vingerha but as said by @aceindy, what I need are some instruction on how to do it. Of course I don’t want to waste your time but if anybody know some tutorial already developped it would be great. Thanks
Stretching my comment, do you WANT to go this path and why? From your comment you seem to be limited knowledgeable on docker so what is the reason to make your life more complex… 
Try the VM way?
EDIT: just explaining how to install one container for (say) mqtt, does not mean this makes it clear for all others, each one has its own settings and these are explained (some good some less) in their installation instructions…the basis is the same, parameters are deviating .
Example
eclipse-mosquitto - Official Image | Docker Hub
@vingerha, actually maybe I do not want to complicate my life further; I deem I will go with VM; the point was that I was told that managing containers instead of add-on wans’t so complicated (following opinions in youtube and forums) and the best way to use HA with NAS.
but if not, i go with HAOS.
thanks
Depends on who you ask, I see / read loads of users struggle with MQTT, Zigbee2MQTT, etc.etc. where add-ons are more prepared (they still require some params) and seem much less sensitive to human errors.
So why do I have docker? Because I already had docker on my NAS for other non-HA purposes and it was easy to continue (aside what I mentioned above)
Cristal clear, yes, it is not my case I do not want to spend months for few containers. I proceed with OS. Thanks to everybody
Which add-ons do you need exactly? With self-managed add-ons via independent Docker containers, there is not THE ONE way. Each Docker container is structured slightly differently and must/may be used in different ways with Home Assistant.
I like docker a lot and run it on a Synology NAS. I’ve been successful doing it vis the UI and have just moved over to docker-compose. It’s definitely a technical endeavor, but at the same time I read enough HASSOS add-on horror stories here - that and the end of the day to troubleshoot you’ll need to understand how it works anyways. That said the VM approach likely has the most guardrails in place.