Remove docker build cache

Sometimes an no space lefterror occurred when building Dockerfile .
When I checked the storage capacity used by Docker, it turned out that the build cache was extremely large.

$ docker system df
TYPE                TOTAL               ACTIVE              SIZE                RECLAIMABLE
Images              45                  6                   99.35GB             74.17GB (74%)
Containers          10                   6                  27.06GB             6.004GB (22%)
Local Volumes       7                   1                   0B                  0B
Build Cache         414                 0                   41.58GB             41.58GB

I didn’t know how to clear this Build cache immediately, so I’ll leave it as a memo. The conclusion is very simple, you can delete it with the following command ( reference URL ).

$ docker builder prune

After executing this command, docker system dftry ...

$ docker system df
TYPE                TOTAL               ACTIVE              SIZE                RECLAIMABLE
Images              25                  6                   99.35GB             74.17GB (74%)
Containers          8                   6                   27.06GB             6.004GB (22%)
Local Volumes       3                   1                   0B                  0B
Build Cache         96                  0                   0B                  0B

I was able to erase it safely. If you’re using Docker and you’re worried about remaining storage space, it might be worth a try.