$# resources on docker 

<br>


### resources

* [Container Technology Wiki ](https://www.aquasec.com/wiki/display/containers/).
* [250 Practice Questions for the DCA Exam](https://medium.com/bb-tutorials-and-thoughts/250-practice-questions-for-the-dca-exam-84f3b9e8f5ce).



<br>

---

### tricks and notes

<br>

#### shared Folders

Removing some of the default shared folders can decrease CPU usage (e.g. remove `/Volumes` and `/private`). 

Check storage with:

```
docker info |grep Storage
```

#### performance

In case of performance problems you can run:

```
docker run --rm=true -it --privileged --pid=host \
    <image name> /usr/bin/top
```

#### cleaning Up

See disk space:

```
docker system df
```


Remove stopped containers, dangling images, the build cache, and unused networks:

```
docker system prune
```