"docker images" command doesn't show correct size -


i've built image using dockerfile in repo , since make on opencv source files image size increases 3.1 gb. so, in order reduce size of image removed source , build files after installing opencv , if check size of image show size has reduced when check using docker images command size remains same.

here's output docker build

run echo "size of image before installing opencv"  ---> using cache  ---> 6408d5fde660 step 11 : run echo `du -sh /`  ---> running in 70e945c95f0c 1.9g /  ---> 60f80a0d27e6 removing intermediate container 70e945c95f0c step 12 : run cd ~/ &&    git clone...... step 14 : run echo "size of image after installing opencv"  ---> using cache  ---> 1e065271efa7 step 15 : run echo `du -sh /`  ---> running in 0f82de699dd9 5.9g /  ---> a90660ac1f25 removing intermediate container 0f82de699dd9 step 16 : run echo "size of opencv source , build directories"  ---> running in 7412b1e468e8 size of opencv source , build directories  ---> 252b6d0ef5b7 removing intermediate container 7412b1e468e8 step 17 : run echo `du -sh ~/opencv*`  ---> running in 8fddb31f4770 3.8g /root/opencv 218m /root/opencv_contrib  ---> 3f9c355fec15 removing intermediate container 8fddb31f4770 step 18 : run rm -rf ~/opencv*  # removes  ---> running in 8a6c823f5675  ---> 96af8b3d01bf removing intermediate container 8a6c823f5675 step 19 : run echo "size of image after removing opencv source ,     build directories"  ---> running in e292c233f8db size of image after removing opencv source , build directories  ---> b08582019c1b removing intermediate container e292c233f8db step 20 : run echo `du -sh ~/opencv*`  ---> running in 9cb62f3be3b3 du: cannot access '/root/opencv*': no such file or directory  ---> 74473a783265 removing intermediate container 9cb62f3be3b3  step 21 : run echo `du -sh /`  ---> running in 45c9fcedf650 1.9g /  ---> 0350a13a1a3b removing intermediate container 45c9fcedf650 built 0350a13a1a3b

from last step looks image size should 1.9gb when docker images shows me 6.298 gb

➜  d1 docker images repository tag     image id      created       size ubuntu_py latest 0350a13a1a3b 11 seconds ago  6.298 gb

even container size shown correctly,

➜  d1 docker run -it ubuntu_py /bin/bash root@b549d9716e19:/# ls bin  boot  dev  etc  home  lib  lib64  media  mnt  opt  proc  root  run  sbin  srv  sys  tmp  usr  var root@b549d9716e19:/# du -sh 1.9g    . root@b549d9716e19:/#

docker layers immutable. once it's created, it's there stay. if want build remove cruft used build need things in same run command or it's going layer everything.

edit: in fact, it's going have marginally worse effect delete files are, you're adding additional layer docker has whiteout files want delete, increasing size :p


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