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Once running a docker build I ran into the error:

docker build --rm -t project-backend:06b1206 .
Sending build context to Docker daemon  994.7MB
Step 1/28 : FROM microsoft/dotnet:2.2-aspnetcore-runtime AS base
 ---> e7e3b238011c
Step 2/28 : WORKDIR /app
 ---> Using cache
 ---> 574c81257103
Step 3/28 : EXPOSE 80
 ---> Using cache
 ---> 5baf6a10ad9c
Step 4/28 : EXPOSE 443
 ---> Using cache
 ---> 9d594ac86e87
Step 5/28 : FROM microsoft/dotnet:2.2-sdk AS build
 ---> 2357b6790b9d
Step 6/28 : WORKDIR /src
 ---> Running in 838f2f3867df
lstat /var/lib/docker/overlay2/33422fae8a965ca440e31356a063df374eb72ea9b3f34f13c93ed67fdadb938c/merged/src: stale NFS file handle

running docker image prune and docker container prune did not fix the issue. looking at mount also didn’t bring any issue

docker images
REPOSITORY            TAG                      IMAGE ID            CREATED             SIZE
<none>                <none>                   d5102775961b        14 seconds ago      261MB
microsoft/dotnet      2.2-sdk                  2357b6790b9d        4 days ago          1.74GB
microsoft/dotnet      2.2-aspnetcore-runtime   e7e3b238011c        4 days ago          261MB
busybox               latest                   6d5fcfe5ff17        6 days ago          1.22MB
ubuntu                latest                   549b9b86cb8d        2 weeks ago         64.2MB
portainer/portainer   latest                   ff4ee4caaa23        4 weeks ago         81.6MB

Still, there are 4 images that did not clear, very odd! and apparently I must do a docker image prune -a (with a -a was trick!).

root@dev1de:~/project/project-backend# docker image prune
WARNING! This will remove all dangling images.
Are you sure you want to continue? [y/N] y
Deleted Images:
deleted: sha256:d5102775961bf17f1a0df5f7060dccb4faeb2d9b48df3c56885d00a849b3baa1
deleted: sha256:4a42287044968cee892d85562b8cde4d47f407200b448d6cb3b5f6d16c97102e
deleted: sha256:12224d4127a1280e5bcf9dd0ae49e7222160db17ca6bbe327eabfdae3eac6b06
deleted: sha256:4a3b05eaf2cbf42b455a1c40c269baca75908fe85482a58828cf01f4a039db10