3. Managing Your Docker Images

Activity 3.01: Build Scripts Using Git Hash Versioning

Solution:

There are a variety of ways you could complete this activity. Here is one example:

1. Create a new build script. The first line, showing the set –ex command, prints each step to the screen and will fail the script if any of the steps fail. Lines 3 and 4 set the variables for your registry and service names:

   1 set -ex
   2
   3 REGISTRY=dev.docker.local:5000
   4 SERVICENAME=postgresql

2. In line 6, set the GIT_VERSION variable to point to your short Git commit hash. The build script then prints this value to the screen in line 7:

   6 GIT_VERSION=`git log -1 --format=%h`
   7 echo "version: $GIT_VERSION "

3. Use the docker build command in line 9 to create your new image and add the docker push command in line 11 to push the image to your local Docker registry:

   9 docker build -t $REGISTRY/$SERVICENAME:$GIT_VERSION .
   10
   11 docker push ...