DockerError 900 - Cannot connect to Docker Engine via unix:///run/docker.sock

[ppastur]

Hello,

I have all my services running as containers including Portainer and Home Assistant. Portainer connects fine via /var/run/docker.sock:/var/run/docker.sock. I can't seem to get monitor_docker running using the same mapping. The error I see in the HA logs is:

2023-04-27 12:14:43.514 ERROR (Thread-2 (RunDocker)) [custom_components.monitor_docker] Failed Docker connect: DockerError(900, 'Cannot connect to Docker Engine via unix:///run/docker.sock [Cannot connect to unix socket /run/docker.sock ssl:default [Permission denied]]')<

Here is my docker-compose file for HA (with some sensitive info removed)

services: homeassistant: image: lscr.io/linuxserver/homeassistant:latest container_name: name hostname: hostname dns: - x.x.x.x - x.x.x.x environment: - PUID=1000 - PGID=1000 - TZ=Australia/Sydney volumes: - /share/path to homeassistant/homeassistant/config:/config - /var/run/docker.sock:/var/run/docker.sock ports: - xxx3:xxx3 #optional restart: always networks: default: external: false name: network_here<

May I ask for some help please - what am I doing wrong?

[PoetaGA]

In SSH or in Terminal, run this command "sudo chmod 664 /var/run/docker.sock"

After this, Home Assistant can access to Docker Sock

[B4dC4rd]

Hello @PoetaGA In my case, the command didn't help.

I first tried to run it in Home Assistant :-D but finally ran it in my NAS environement where the docker is hosted.

The command seemd to run without errors but no joy even after rebooting HASS.

Is there anything elese I could check ?

[B4dC4rd]

By the Way, Here is the result of thrying to run the command : docker -H tcp://host IP:2376 in my NAS via SSH.

Usage: docker [OPTIONS] COMMAND

A self-sufficient runtime for containers

Options: --config string Location of client config files (default "/var/services/homes/NAS Admin/.docker") -c, --context string Name of the context to use to connect to the daemon (overrides DOCKER_HOST env var and default context set with "docker context use") -D, --debug Enable debug mode -H, --host list Daemon socket(s) to connect to (default ) -l, --log-level string Set the logging level ("debug"|"info"|"warn"|"error"|"fatal") (default "info") --tls Use TLS; implied by --tlsverify --tlscacert string Trust certs signed only by this CA (default "/var/services/homes/NAS Admin/.docker/ca.pem") --tlscert string Path to TLS certificate file (default "/var/services/homes/NAS Admin/.docker/cert.pem") --tlskey string Path to TLS key file (default "/var/services/homes/NAS Admin/.docker/key.pem") --tlsverify Use TLS and verify the remote -v, --version Print version information and quit

Management Commands: builder Manage builds config Manage Docker configs container Manage containers context Manage contexts image Manage images manifest Manage Docker image manifests and manifest lists network Manage networks node Manage Swarm nodes plugin Manage plugins secret Manage Docker secrets service Manage services stack Manage Docker stacks swarm Manage Swarm system Manage Docker trust Manage trust on Docker images volume Manage volumes

Commands: attach Attach local standard input, output, and error streams to a runnin g container build Build an image from a Dockerfile commit Create a new image from a container's changes cp Copy files/folders between a container and the local filesystem create Create a new container diff Inspect changes to files or directories on a container's filesyste m events Get real time events from the server exec Run a command in a running container export Export a container's filesystem as a tar archive history Show the history of an image images List images import Import the contents from a tarball to create a filesystem image info Display system-wide information inspect Return low-level information on Docker objects kill Kill one or more running containers load Load an image from a tar archive or STDIN login Log in to a Docker registry logout Log out from a Docker registry logs Fetch the logs of a container pause Pause all processes within one or more containers port List port mappings or a specific mapping for the container ps List containers pull Pull an image or a repository from a registry push Push an image or a repository to a registry rename Rename a container restart Restart one or more containers rm Remove one or more containers rmi Remove one or more images run Run a command in a new container save Save one or more images to a tar archive (streamed to STDOUT by de fault) search Search the Docker Hub for images start Start one or more stopped containers stats Display a live stream of container(s) resource usage statistics stop Stop one or more running containers tag Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE top Display the running processes of a container unpause Unpause all processes within one or more containers update Update configuration of one or more containers version Show the Docker version information wait Block until one or more containers stop, then print their exit cod es

Run 'docker COMMAND --help' for more information on a command.

To get more help with docker, check out our guides at https://docs.docker.com/go /guides/

[B4dC4rd]

In SSH or in Terminal, run this command "sudo chmod 664 /var/run/docker.sock"

After this, Home Assistant can access to Docker Sock

Should this be run from a specific account? I've tried with the NAS Admin

[B4dC4rd]

Hi @ualex73 , do you have any clue on what the issue could be or what should I look at?

[B4dC4rd]

I also get this type or error, but the containers affected seem random:

[Docker] nw_cloudflare: Container not available anymore (3) (DockerError(900, 'Cannot connect to Docker Engine via tcp://redacted_IP:2375 [Server disconnected]'))

[B4dC4rd]

Still stuck :-( Hi @ualex73 do you have feedback to share on your side? Cheers

[apedance]

I recently encountered the same error. Happened without any modification. Only one machine affected.

[Alonzzzo2]

same here, Can't get this to work

[i4mr000t]

same here. cant connect to docker.

homeassistant is running on a raspi with hassos. 192.168.178.5

docker is running on another host. 192.168.178.19

EDIT: Im trying to connect to remote docker so I had to do some settings in docker itself.

For Future Reference you need to edit docker service like mentioned in the docker docus: https://docs.docker.com/config/daemon/remote-access/

Now its working

[ualex73]

I updated the README.md with the comment of i4mr000t, so I will close this ticket.