Dockerfile
When we re-build the image using
the Dockerfile with same lines for the second and sub-subsequent builds
without any change to the Dockerfile, it uses Cache and the build will
be very quick
Step 2/3 and Step 3/3 used cache
Start the server
Lets add a line after RUN apk add --update redis line in the Dockerfile
Dockerfile look like this
It has a new line -> RUN apk add --update gcc
Lets re-build the image using docker build .
Now
you see that Step 2/4 has used cache, Step 3/4 is a new step and built
for the first time. Important to note here is Step 4/4 is also newly
built
If we add a new step in the Dockerfile, the steps from that point will be newly built
Lets try to re-build again and see what happens with no changes to Dockerfile
Now Step 2/4, Step 3/4 and Step 4/4 are built using cache