$ docker save -o /tmp/httpd.tar httpd:latest

$ docker load -i /tmp/httpd.tar

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if you got stuck your system while saving the docker images do instead of the first command

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$ ionice -c2 -n7 nice -n19 docker save -o httpd.tar httpd:latest

nice -n19: lowest CPU priority

ionice -c2 -n7: lowest I/O priority for the operation

This reduces the chance of system freeze dramatically.






harish@novlaptop:/tmp$ docker system df
TYPE            TOTAL     ACTIVE    SIZE      RECLAIMABLE
Images          6         6         2.556GB   152.9MB (5%)
Containers      6         1         129.8MB   129.8MB (99%)
Local Volumes   5         5         1.104GB   0B (0%)
Build Cache     103       0         115.5MB   115.5MB

Perfect — if you only want to clean up the **build cache** and keep everything else (images, volumes, containers) intact, here's exactly what you need:

✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨

## 🧹 Clean Only the Build Cache

Run:

```bash
docker builder prune
```

It will prompt:

> ⚠️ WARNING! This will remove all dangling build cache. Are you sure you want to continue? [y/N]

Type `y` and hit enter.

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### 🧼 If You Want to Force It Without Prompt

```bash
docker builder prune -f
```

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### ✅ What It Does

- Frees space used by **intermediate image layers** and **unused build cache**
- Leaves:
  - All your **images**             docker images prune
  - All your **containers**         docker containers prune
  - All your **volumes**            docker volumes prune
  - All your **data**               docker data prune

Totally safe if you're not actively building Dockerfiles right now.

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Let me know if you want a cleanup plan to periodically clear only build cache via cron or script — I can set that up for you too!