docker: 'buildx' is not a docker command - Linux Mint

[Teifion]

I recently updated my system and running my build got this:

docker build --build-arg env=prod -t teiserver:latest .
DEPRECATED: The legacy builder is deprecated and will be removed in a future release.
            Install the buildx component to build images with BuildKit:
            https://docs.docker.com/go/buildx/

I soon got

docker: 'buildx' is not a docker command.
See 'docker --help'

I spent half an hour searching. Installing docker desktop was regarded as the most common solution but has not fixed it. I'm not sure what I'm doing wrong or how I should be fixing this.

I'm using Linux Mint 20.3 x86_64.

[crazy-max]

@Teifion Can you show the output of docker version and docker info please? And also what installation method did you use from our docs https://docs.docker.com/engine/install/?.

[Teifion]

Client: Docker Engine - Community
 Cloud integration: v1.0.29
 Version:           23.0.0
 API version:       1.41 (downgraded from 1.42)
 Go version:        go1.19.5
 Git commit:        e92dd87
 Built:             Wed Feb  1 17:49:08 2023
 OS/Arch:           linux/amd64
 Context:           desktop-linux

Server: Docker Desktop 4.16.2 (95914)
 Engine:
  Version:          20.10.22
  API version:      1.41 (minimum version 1.12)
  Go version:       go1.18.9
  Git commit:       42c8b31
  Built:            Thu Dec 15 22:26:14 2022
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.6.14
  GitCommit:        9ba4b250366a5ddde94bb7c9d1def331423aa323
 runc:
  Version:          1.1.4
  GitCommit:        v1.1.4-0-g5fd4c4d
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

Client:
 Context:    desktop-linux
 Debug Mode: false
 Plugins:
  compose: Docker Compose (Docker Inc.)
    Version:  v2.15.1
    Path:     /usr/lib/docker/cli-plugins/docker-compose
  dev: Docker Dev Environments (Docker Inc.)
    Version:  v0.0.5
    Path:     /usr/lib/docker/cli-plugins/docker-dev
  extension: Manages Docker extensions (Docker Inc.)
    Version:  v0.2.17
    Path:     /usr/lib/docker/cli-plugins/docker-extension
  sbom: View the packaged-based Software Bill Of Materials (SBOM) for an image (Anchore Inc.)
    Version:  0.6.0
    Path:     /usr/lib/docker/cli-plugins/docker-sbom
  scan: Docker Scan (Docker Inc.)
    Version:  v0.23.0
    Path:     /usr/lib/docker/cli-plugins/docker-scan

Server:
 Containers: 0
  Running: 0
  Paused: 0
  Stopped: 0
 Images: 0
 Server Version: 20.10.22
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 io.containerd.runtime.v1.linux runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 9ba4b250366a5ddde94bb7c9d1def331423aa323
 runc version: v1.1.4-0-g5fd4c4d
 init version: de40ad0
 Security Options:
  seccomp
   Profile: default
  cgroupns
 Kernel Version: 5.15.49-linuxkit
 Operating System: Docker Desktop
 OSType: linux
 Architecture: x86_64
 CPUs: 16
 Total Memory: 7.673GiB
 Name: docker-desktop
 ID: 7TKQ:ZF2Y:SS5Y:CAC4:DYLP:KRWW:FGN7:S3LP:U6BA:EJHQ:5VZM:DZ2S
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 HTTP Proxy: http.docker.internal:3128
 HTTPS Proxy: http.docker.internal:3128
 No Proxy: hubproxy.docker.internal
 Registry: https://index.docker.io/v1/
 Experimental: false
 Insecure Registries:
  hubproxy.docker.internal:5000
  127.0.0.0/8
 Live Restore Enabled: false

The docker install was a long time ago but the notes I have for future installs are

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(. /etc/os-release; echo "$UBUNTU_CODENAME") stable"
cat /etc/apt/sources.list.d/additional-repositories.list 
deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable
sudo apt-get update
sudo apt-get -y  install docker-ce docker-compose
sudo usermod -aG docker $USER
sudo setfacl --modify user:$USER:rw /var/run/docker.sock

As part of installing docker desktop I have since run:

sudo aptitude -y install apt-transport-https ca-certificates curl software-properties-common gnupg lsb-release

# Open this URL, get the .deb installer
https://docs.docker.com/desktop/install/ubuntu/

sudo mkdir -p /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
sudo aptitude update
sudo aptitude install docker-ce docker-ce-cli containerd.io docker-compose-plugin

# Verify
sudo docker run hello-world

sudo aptitude install docker-desktop

Thank you for taking the time to help

[crazy-max]

Ok so you're using Docker Desktop 4.16.2 and you're also installing docker-ce (engine, cli and plugins) on your host. Having side-by-side Docker Desktop for Linux and Docker Engine could cause issues but don't think that's related to this.

Something that bothers me is Buildx does not look shipped with Docker Desktop for Linux (cc @mat007 @p1-0tr):

 Plugins:
  compose: Docker Compose (Docker Inc.)
    Version:  v2.15.1
    Path:     /usr/lib/docker/cli-plugins/docker-compose
  dev: Docker Dev Environments (Docker Inc.)
    Version:  v0.0.5
    Path:     /usr/lib/docker/cli-plugins/docker-dev
  extension: Manages Docker extensions (Docker Inc.)
    Version:  v0.2.17
    Path:     /usr/lib/docker/cli-plugins/docker-extension
  sbom: View the packaged-based Software Bill Of Materials (SBOM) for an image (Anchore Inc.)
    Version:  0.6.0
    Path:     /usr/lib/docker/cli-plugins/docker-sbom
  scan: Docker Scan (Docker Inc.)
    Version:  v0.23.0
    Path:     /usr/lib/docker/cli-plugins/docker-scan

Can you check if docker-buildx-plugin is installed with sudo apt list --installed | grep buildx?

If it's not installed can you do aptitude install docker-buildx-plugin and try again?

Can you also show the output of docker context ls?

[Teifion]

sudo apt list --installed | grep buildx

It came back with nothing, running the install message you posted gave me the following output afterwards.

sudo apt list --installed | grep buildx   
docker-buildx-plugin/focal,now 0.10.2-1~ubuntu.20.04~focal amd64 [installed]

At this stage my docker build command I posted at the start appears to work.

docker context ls
NAME                TYPE                DESCRIPTION                               DOCKER ENDPOINT                                    KUBERNETES ENDPOINT   ORCHESTRATOR
default             moby                Current DOCKER_HOST based configuration   unix:///var/run/docker.sock                                              
desktop-linux *     moby

Thank you again for helping. I'm happy to consider this closed but also happy to try additional things or answer additional questions if it helps prevent this happening by mistake to others.

[crazy-max]

Looks good, I will report the issue with Buildx plugin missing in Docker Desktop for Linux. Thanks for your feedback.

[crazy-max]

Should be sorted in the next Docker Desktop version.

[unphased]

I can no longer docker buildx prune to clean up various huge amounts of build cache that were made with cache mount (a buildkit (buildx? what's the difference?) feature) since my docker updated by itself to version 23. Help, how can I clean this disk space up? Install buildx? Why do I have to install buildx now when docker buildx prune used to work...

Update: I ran sudo apt install docker-buildx-plugin and it restored my ability to prune the build cache.