[QUESTION] Save my login password on the remote server?

[zyxkad]

Description

Steps to reproduce the issue:

1. Run docker login
2. Input your username and password

Describe the results you received:

WARNING! Your password will be stored unencrypted in /home/username/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store

Describe the results you expected: None

Additional information you deem important (e.g. issue happens only occasionally):

I don't understand why docker saved my password unencrypted on the computer.
It's a really unsafe operation.
How can I disabled it? I wasn't found the operation in https://docs.docker.com/engine/reference/commandline/login/

Output of docker version:

Client: Docker Engine - Community
 Version:           20.10.12
 API version:       1.41
 Go version:        go1.16.12
 Git commit:        e91ed57
 Built:             Mon Dec 13 11:45:48 2021
 OS/Arch:           linux/amd64
 Context:           default
 Experimental:      true

Server: Docker Engine - Community
 Engine:
  Version:          20.10.12
  API version:      1.41 (minimum version 1.12)
  Go version:       go1.16.12
  Git commit:       459d0df
  Built:            Mon Dec 13 11:43:56 2021
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.4.12
  GitCommit:        7b11cfaabd73bb80907dd23182b9347b4245eb5d
 runc:
  Version:          1.0.2
  GitCommit:        v1.0.2-0-g52b36a2
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

Output of docker info:

Client:
 Context:    default
 Debug Mode: false
 Plugins:
  app: Docker App (Docker Inc., v0.9.1-beta3)
  buildx: Docker Buildx (Docker Inc., v0.7.1-docker)
  scan: Docker Scan (Docker Inc., v0.12.0)

Server:
 Containers: 20
  Running: 11
  Paused: 0
  Stopped: 9
 Images: 91
 Server Version: 20.10.12
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: systemd
 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: 7b11cfaabd73bb80907dd23182b9347b4245eb5d
 runc version: v1.0.2-0-g52b36a2
 init version: de40ad0
 Security Options:
  apparmor
  seccomp
   Profile: default
  cgroupns
 Kernel Version: 5.10.0-14-amd64
 Operating System: Debian GNU/Linux 11 (bullseye)
 OSType: linux
 Architecture: x86_64
 CPUs: 4
 Total Memory: 15.52GiB
 Name: nascasrv
 ID: UFWT:E4YA:XVGU:2QIN:POHI:4BUK:D2HE:PV7J:OJ5P:RO3E:XMGY:PHN5
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Username: kupen
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false

Additional environment details (AWS, VirtualBox, physical, etc.):

[zyxkad]

I think docker should use and keep login token, like this github. Not your password

[s4ke]

As the warning message said, check out:

https://docs.docker.com/engine/reference/commandline/login/#credentials-store

[cpuguy83]

As mentioned by @s4ke, you can use the credential stores to do this more securely. docker login will also only store only the identity token if the registry supports such auth.