# Notes on docker 

Docker uses a lot of system resources without your knowledge.
This notes describe how to find out and what to do about it.

## Find out space used by docker:
```
sudo docker system df
```
and
```
sudo du -sh /var/lib/docker/
```

## What to do about it?

### 1. Remove unused layers (very effective)
```
sudo docker system prune
```
### 2. Remove unused images
```
sudo docker image prune -a
```
### 3. Clear out unused volume data
```
sudo docker volume prune
```

### 4. Clear out builder cache
```
sudo docker builder prune
```

### 5. Remove unused containers:
```
sudo docker container prune
```