fix: prune everything, detailed logging, improve readme

docker-cronjob/README.md → docker-prune-cron/README.md

@@ -30,7 +30,7 @@ crontab -e
 Add the following line to schedule the job:
 
 ```
-0 */4 * * * /home/azureuser/prune_docker_images.sh > /dev/null 2>&1
+0 */4 * * * /home/azureuser/prune_docker_images.sh
 ```
 
 ### 3. Verify the Cron Job
@@ -40,6 +40,12 @@ List the current cron jobs to ensure your job is added:
 ```sh
 crontab -l
 ```
+You can also check the logged output:
+
+```sh
+
+cat docker_prune.log
+```
 
 ## Troubleshooting
 

docker-prune-cron/prune_docker_images.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+set -o errexit
+
+LOGFILE="$HOME/docker_prune.log"
+
+{
+  echo "Starting Docker system prune at $(date)"
+  sudo /usr/bin/docker system prune -f
+  echo "Pruned Docker objects successfully"
+
+  echo "Starting Docker volume prune at $(date)"
+  sudo /usr/bin/docker system prune --volumes -f
+  echo "Pruned Docker volumes successfully"
+  echo "Completed at $(date)"
+} >> "$LOGFILE" 2>&1