Removing old / unused docker images

Question

I'm using Sonatype Nexus as a Docker Registry and after a while, it got really big (new image with every CI build and some old projects).

I tried using "Purge unused docker manifests and images" task, but it doesn't seem to do anything.

Answer 1

I remove the old docker images manually.

1. get nexus-cli

   wget https://s3.eu-west-2.amazonaws.com/nexus-cli/1.0.0-beta/linux/nexus-cli
   
   chmod +x nexus-cli
   

2. configure host

   ./nexus-cli configure
   

3. show images

   ./nexus-cli image ls
   

4. keep the latest 5 images

   ./nexus-cli image delete -name mlabouardy/nginx -keep 5
   

5. A clean script

image_file=image.txt
CLI_HOME=/data/nexus3
KEEP_VERSION_NUM=5

$CLI_HOME/nexus-cli image ls > $image_file
sed -i '$d' $image_file


cat $image_file | while read line
do
    echo "start clean image:  $line"
    $CLI_HOME/nexus-cli image delete -name $line -keep $KEEP_VERSION_NUM
done

6. create create docker - delete unsued manifests and images task

7. create create admin -compact blob store task