Docker rootless 无法拉取镜像

Question

我运行宁 docker 在服务器上无根，跟随 https://docs.docker.com/engine/security/rootless/。

有了这个我就可以拉运行 hello-world。但是每当我想拉出更复杂的图像时，我运行就会出现以下错误：

$ docker pull ubuntu
Using default tag: latest
latest: Pulling from library/ubuntu
83ee3a23efb7: Extracting [==================================================>]  28.57MB/28.57MB
db98fc6f11f0: Download complete 
f611acd52c6c: Download complete 
failed to register layer: ApplyLayer exit status 1 stdout:  stderr: lchown /etc/gshadow: operation not permitted

来自docker info的输出：

$ docker info
Client:
 Context:    default
 Debug Mode: false

Server:
 Containers: 0
  Running: 0
  Paused: 0
  Stopped: 0
 Images: 1
 Server Version: 20.10.2
 Storage Driver: vfs
 Logging Driver: json-file
 Cgroup Driver: none
 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.runtime.v1.linux runc io.containerd.runc.v2
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 269548fa27e0089a8b8278fc4fc781d7f65a939b
 runc version: ff819c7e9184c13b7c2607fe6c30ae19403a7aff
 init version: de40ad0
 Security Options:
  seccomp
   Profile: default
  rootless
 Kernel Version: 4.15.0-135-generic
 Operating System: Ubuntu 18.04.3 LTS
 OSType: linux
 Architecture: x86_64
 CPUs: 16
 Total Memory: 125.9GiB
 Name: ourserver
 ID: ZZ4G:IF5W:HJA4:GBZ4:BOHY:YNLX:EPTA:56OH:REXN:QJ5A:2HL3:KWWX
 Docker Root Dir: /home/honerkam/.local/share/docker
 Debug Mode: false
 Username: dhonerkamp
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false
 Product License: Community Engine

WARNING: Running in rootless-mode without cgroups. To enable cgroups in rootless-mode, you need to boot the system in cgroup v2 mode.
WARNING: bridge-nf-call-iptables is disabled
WARNING: bridge-nf-call-ip6tables is disabled

分配了 subids 并安装了 newuidmap、newgidmap：

$ grep ^$(whoami): /etc/subuid
honerkam:231072:165537
$ grep ^$(whoami): /etc/subgid
honerkam:231072:165537
$ which newuidmap
/usr/bin/newuidmap
$ which newgidmap
/usr/bin/newgidmap

我能想到的此设置中唯一不寻常的部分是我可以访问已安装文件系统上的驱动器，但引导根目录无法访问它。我自己也有root权限。

如能提供有关此问题原因的任何线索，我们将不胜感激！

Answer 1

如果其他人遇到此问题，请复制我在 github 收到的答案：

NFS 不支持 CAP_DAC_OVERRIDE，因此您需要在 ~/.config/docker/daemon 中指定自定义 {"data-root":"/somewhere-out-of-nfs"}。 json 将图像存储在非 NFS 位置。

有关技术详细信息，请参阅 https://www.redhat.com/sysadmin/rootless-podman-nfs。

Docker rootless 无法拉取镜像

Docker rootless unable to pull images

linux

bash

docker

rootless