# Docker NR & ttyUSB0 Permission denied

**URL:** <https://discourse.nodered.org/t/docker-nr-ttyusb0-permission-denied/44803>\
**Category:** General\
**Created:** [27 April 2021 12:48 UTC](https://discourse.nodered.org/t/docker-nr-ttyusb0-permission-denied/44803 "2021-04-27T12:48:41Z")\
**Posts on this page:** 1\
**Showing post:** 17

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**Author:** ![janvda](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/janvda/32/234_2.png) [@janvda](https://discourse.nodered.org/u/janvda)\
**Post date:** [28 April 2021 08:19 UTC](https://discourse.nodered.org/t/docker-nr-ttyusb0-permission-denied/44803/17 "2021-04-28T08:19:42Z")

</div>

What you mention there is the possibility to use a docker-compose file, but I don't think you can add a group to node-red via a docker-compose file.

You need to create a simple image that sets the permission.  
So you need to create a Dockerfile with following contents on the host machine where portainer is running.

```auto
FROM nodered/node-red

USER root
RUN addgroup node-red dialout
USER node-red

```

You can a build an docker image based on the above Dockerfile using below command (should be run in the same folder where you have created the above Dockerfile)

```auto
[root@nuc-jan test]# docker build -t node-red-with-dialout-permissions .
Sending build context to Docker daemon 2.048kB
Step 1/4 : FROM nodered/node-red:1.2.9-12
 ---> 9772fc53c59f
Step 2/4 : USER root
 ---> Using cache
 ---> f51e7cd902b0
Step 3/4 : RUN addgroup node-red dialout
 ---> Running in 15b6a066db67
Removing intermediate container 15b6a066db67
 ---> dfcc57c65d21
Step 4/4 : USER node-red
 ---> Running in 407d4e0100a9
Removing intermediate container 407d4e0100a9
 ---> 0e44d20e1653
Successfully built 0e44d20e1653
Successfully tagged node-red-with-dialout-permissions:latest
[root@nuc-jan test]# 

```

Now you can deploy a container using image `node-red-with-dialout-permissions:latest` in portainer as you used to do.

I have tested this and it works for me as you can see in screenshot below:

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/a/a/aa74c67d2ed242d37c4a9211e49f6e4f6590cbfa.png)

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_[View the full topic](https://discourse.nodered.org/t/docker-nr-ttyusb0-permission-denied/44803)._