exec apk del create cache file,can we use apk del --no-cache,Reduced image size 1M

[khs1994]

I found image have apk cache file

$ docker run -it --rm php:7.2.9-fpm-alpine ls -la /var/cache/apk

total 1260
drwxr-xr-x    1 root     root          4096 Aug 23 00:18 .
drwxr-xr-x    1 root     root          4096 Jul  5 14:47 ..
-rw-r--r--    1 root     root        750769 Aug 23 00:18 APKINDEX.adfa7ceb.tar.gz
-rw-r--r--    1 root     root        525412 Aug 23 00:18 APKINDEX.efaa1f73.tar.gz

Then I found this cache file create by $ apk del

$ docker run -it --rm alpine:3.8 sh

$ apk add --no-cache php

$ ls -la /var/cache/apk

# empty

$ apk del php

$ ls -la /var/cache/apk

drwxr-xr-x    1 root     root          4096 Aug 23 09:07 .
drwxr-xr-x    1 root     root          4096 Jul  5 14:47 ..
-rw-r--r--    1 root     root        750769 Aug 23 09:07 APKINDEX.adfa7ceb.tar.gz
-rw-r--r--    1 root     root        525412 Aug 23 09:07 APKINDEX.efaa1f73.tar.gz

exec apk del create cache file on /var/cache/apk

exec apk del --no-cache don't create cache file.

[yosifkit]

Related comment: docker-library/python#330 (comment)