docker logs <container_w_no_logs> --tail <N> hangs in Docker 23.0.0 #4008
Closed
Description
Description
Prior to Docker engine 23.0.0 release, docker logs <container> --tail <N> would output up to N container logs. If there were none, it would output zero lines and exit.
Since docker 23.0.0, this command hangs (instead of terminating).
Since there is no mention of this "feature" in the release notes, I took the libery of assuming it's a bug. Please correct me if I'm wrong and this is intended behaviour
Reproduce
You need a container that has at least one log
# verify `docker logs` won't hang on non-empty logfile
docker logs <container> --tail 5
# find out log path
docker inspect --format='{{.LogPath}}' <container> | xclip
# create an empty file
: > empty
# truncate the logfile
sudo cp empty <log path>
# docker will hang now
docker logs <container> --tail 5
Expected behavior
docker logs <container> --tail 5
should not hang, but return immediately on containers with no logs
docker version
Client: Docker Engine - Community
Version: 23.0.0
API version: 1.42
Go version: go1.19.5
Git commit: e92dd87
Built: Wed Feb 1 17:49:08 2023
OS/Arch: linux/amd64
Context: default
Server: Docker Engine - Community
Engine:
Version: 23.0.0
API version: 1.42 (minimum version 1.12)
Go version: go1.19.5
Git commit: d7573ab
Built: Wed Feb 1 17:49:08 2023
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.6.16
GitCommit: 31aa4358a36870b21a992d3ad2bef29e1d693bec
runc:
Version: 1.1.4
GitCommit: v1.1.4-0-g5fd4c4d
docker-init:
Version: 0.19.0
GitCommit: de40ad0docker info
Client:
Context: default
Debug Mode: false
Plugins:
buildx: Docker Buildx (Docker Inc.)
Version: v0.10.2
Path: /usr/libexec/docker/cli-plugins/docker-buildx
compose: Docker Compose (Docker Inc.)
Version: v2.15.1
Path: /usr/lib/docker/cli-plugins/docker-compose
scan: Docker Scan (Docker Inc.)
Version: v0.23.0
Path: /usr/libexec/docker/cli-plugins/docker-scan
Server:
Containers: 31
Running: 13
Paused: 0
Stopped: 18
Images: 219
Server Version: 23.0.0
Storage Driver: overlay2
Backing Filesystem: extfs
Supports d_type: true
Using metacopy: false
Native Overlay Diff: true
userxattr: false
Logging Driver: json-file
Cgroup Driver: cgroupfs
Cgroup Version: 1
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 runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 31aa4358a36870b21a992d3ad2bef29e1d693bec
runc version: v1.1.4-0-g5fd4c4d
init version: de40ad0
Security Options:
apparmor
seccomp
Profile: builtin
Kernel Version: 5.15.0-58-generic
Operating System: Ubuntu 20.04.5 LTS
OSType: linux
Architecture: x86_64
CPUs: 32
Total Memory: 31.25GiB
Name: <redacted>
ID: <redacted>
Docker Root Dir: /var/lib/docker
Debug Mode: false
Registry: https://index.docker.io/v1/
Experimental: false
Insecure Registries:
127.0.0.0/8
Live Restore Enabled: falseAdditional Info
No response