rootless docker fails to start when using numeric uids in /etc/subuid #40926
Description
Description
I just tried installing rootless docker, and it seems to fail if /etc/subuid doesn't use usernames but instead uids. With numeric uids (as in 20592:3900000:100000) I get this error:
[rootlesskit:parent] error: failed to setup UID/GID map: failed to compute uid/gid map: No subuid ranges found for user "demmeln"
After replacing it with demmeln:3900000:100000 in /etc/subuid (and subgid) I can start the rootless daemon just fine. According to the man page of /etc/subuid numeric uids should be supported and also podman works fine with them.
Output of docker version:
Client: Docker Engine - Community
Version: 19.03.8
API version: 1.40
Go version: go1.12.17
Git commit: afacb8b7f0
Built: Wed Mar 11 01:22:56 2020
OS/Arch: linux/amd64
Experimental: false
Server: Docker Engine - Community
Engine:
Version: 19.03.8
API version: 1.40 (minimum version 1.12)
Go version: go1.12.17
Git commit: afacb8b7f0
Built: Wed Mar 11 01:30:32 2020
OS/Arch: linux/amd64
Experimental: true
containerd:
Version: v1.2.13
GitCommit: 7ad184331fa3e55e52b890ea95e65ba581ae3429
runc:
Version: 1.0.0-rc10
GitCommit: dc9208a3303feef5b3839f4323d9beb36df0a9dd
docker-init:
Version: 0.18.0
GitCommit: fec3683
Output of docker info:
Client:
Debug Mode: false
Server:
Containers: 2
Running: 0
Paused: 0
Stopped: 2
Images: 1
Server Version: 19.03.8
Storage Driver: vfs
Logging Driver: json-file
Cgroup Driver: none
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: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 7ad184331fa3e55e52b890ea95e65ba581ae3429
runc version: dc9208a3303feef5b3839f4323d9beb36df0a9dd
init version: fec3683
Security Options:
seccomp
Profile: default
rootless
Kernel Version: 5.3.0-51-generic
Operating System: Ubuntu 18.04.4 LTS
OSType: linux
Architecture: x86_64
CPUs: 12
Total Memory: 62.44GiB
Name: atcremers83
ID: XMTU:VR3S:4QUF:3ZMX:LAEK:N6AU:K47O:4G7T:MAUL:EWL3:SI5M:MUVH
Docker Root Dir: /usr/wiss/demmeln/bionic/.local/share/docker
Debug Mode: false
Username: nikolausdemmel
Registry: https://index.docker.io/v1/
Labels:
Experimental: true
Insecure Registries:
127.0.0.0/8
Live Restore Enabled: false
Product License: Community Engine
WARNING: No swap limit support