rootless+cgroup2+systemd: improve error message when dbus-user-session is not installed (read unix @->/run/systemd/private: read: connection reset by peer: unknown.) #42793
Description
Description
rootless+cgroup2+systemd fails with a cryptic error when dbus-user-session dpkg is not installed.
It should faily early with more human-readable message
Steps to reproduce the issue:
- Install Rootless Docker to Debian 11, without installing
dbus-user-session docker --context=rootless run -it --rm alpine
Describe the results you received:
$ dockerd-rootless-setuptool.sh install
$ docker --context=rootless run -it --rm alpine
Unable to find image 'alpine:latest' locally
latest: Pulling from library/alpine
29291e31a76a: Pull complete
Digest: sha256:eb3e4e175ba6d212ba1d6e04fc0782916c08e1c9d7b45892e9796141b1d379ae
Status: Downloaded newer image for alpine:latest
docker: Error response from daemon: OCI runtime create failed: container_linux.go:380: starting container process caused: process_linux.go:385: applying cgroup configuration for process caused: error while starting unit "docker
-931c15729b5a968ce803784d04c7421f791d87e5ca1891f34387bb9f694c488e.scope" with properties [{Name:Description Value:"libcontainer container 931c15729b5a968ce803784d04c7421f791d87e5ca1891f34387bb9f694c488e"} {Name:Slice Value:"use
r.slice"} {Name:PIDs Value:@au [4529]} {Name:Delegate Value:true} {Name:MemoryAccounting Value:true} {Name:CPUAccounting Value:true} {Name:IOAccounting Value:true} {Name:TasksAccounting Value:true} {Name:DefaultDependencies Val
ue:false}]: read unix @->/run/systemd/private: read: connection reset by peer: unknown. (The error disappears after running sudo apt-get install -y dbus-user-session and relogging in)
Describe the results you expected:
It should fail with a human-readable error message, probably during dockerd-rootless-setuptool.sh install
Additional information you deem important (e.g. issue happens only occasionally):
Output of docker version:
Client: Docker Engine - Community
Version: 20.10.8
API version: 1.41
Go version: go1.16.6
Git commit: 3967b7d
Built: Fri Jul 30 19:54:22 2021
OS/Arch: linux/amd64
Context: rootless
Experimental: true
Server: Docker Engine - Community
Engine:
Version: 20.10.8
API version: 1.41 (minimum version 1.12)
Go version: go1.16.6
Git commit: 75249d8
Built: Fri Jul 30 19:52:31 2021
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.4.9
GitCommit: e25210fe30a0a703442421b0f60afac609f950a3
runc:
Version: 1.0.1
GitCommit: v1.0.1-0-g4144b63
docker-init:
Version: 0.19.0
GitCommit: de40ad0
Output of docker info:
Client:
Context: rootless
Debug Mode: false
Plugins:
app: Docker App (Docker Inc., v0.9.1-beta3)
buildx: Build with BuildKit (Docker Inc., v0.6.1-docker)
scan: Docker Scan (Docker Inc., v0.8.0)
Server:
Containers: 0
Running: 0
Paused: 0
Stopped: 0
Images: 1
Server Version: 20.10.8
Storage Driver: vfs
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: e25210fe30a0a703442421b0f60afac609f950a3
runc version: v1.0.1-0-g4144b63
init version: de40ad0
Security Options:
seccomp
Profile: default
rootless
cgroupns
Kernel Version: 5.10.0-8-amd64
Operating System: Debian GNU/Linux 11 (bullseye)
OSType: linux
Architecture: x86_64
CPUs: 2
Total Memory: 1.936GiB
Name: debian11.localdomain
ID: ZQ4P:MW36:O5WV:OWSD:N7ND:HO34:OFSX:55MI:4CRG:6ADG:AMWL:BGR7
Docker Root Dir: /home/vagrant/.local/share/docker
Debug Mode: false
Registry: https://index.docker.io/v1/
Labels:
Experimental: false
Insecure Registries:
127.0.0.0/8
Live Restore Enabled: false
WARNING: No cpu cfs quota support
WARNING: No cpu cfs period support
WARNING: No cpu shares support
WARNING: No cpuset support
WARNING: No io.weight support
WARNING: No io.weight (per device) support
WARNING: No io.max (rbps) support
WARNING: No io.max (wbps) support
WARNING: No io.max (riops) support
WARNING: No io.max (wiops) support
Additional environment details (AWS, VirtualBox, physical, etc.):