Dell SmartFabric OS10 User Guide Release 10.5.3

Containers

Docker-CE allows you to download and install external packages and run them within OS10.

When you start a container, use the --net= option to connect it to a network. This network can access the Management and front-end interfaces. If you do not want networking for your Docker containers, use none.

If you are in the sysadmin group, you can run Docker commands from the OS10 Linux Shell.

Docker-CE restrictions

Docker-CE is supported on platforms with at least 16 GB of flash memory.
Docker-CE is disabled by default on the system.
By default, the dockers that you create have no visibility to the Layer 2 traffic arriving on the data ports.
Dell Networking recommends creating containers only with the network type as host or none.
Do not create bridge networks using the docker network create command as this configuration can conflict with the OS10 networking capability.
Interfaces that are part of nondefault VRFs are not available for Docker-CE containers.
Do not use multiple containers simultaneously as this may affect system performance.
Do not run CPU intensive Docker containers.

Enable Docker-CE

Use the following commands in the OS10 Linux Shell:

sudo systemctl enable docker
sudo systemctl start docker

NOTE: When you run the docker run command to create a container, you must use the --net=host parameter.

Install a Docker image

To pull the latest Docker image from a Docker hub:
```
docker pull nginx
```
Or
```
docker pull nginx:latest
```
NOTE: Docker downloads the latest image if you do not specify the image file name.
To pull a Docker image from a private repository:
```
docker pull private-repository-URL
```

View installed local images

Use one of the following commands:

docker images

docker image ls

docker image inspect node:latest

Remove installed local images

Remove the Puppet Agent image:
```
docker image rm puppet-agent
```
Remove the nginx image with the latest tag:
```
docker image rm nginx:latest
```

Install and start images

Create a container with the latest image in the host network namespace:
```
docker run -d --net=host --name mynode node
```
Create a container with the stretch image in the host network namespace:
```
docker run -d --net=host --name strnode node:stretch
```
Create a container with the Puppet Agent image in the host network namespace:
```
docker run -d --net=host --name mypuppet puppet-agent
```
Start an existing container:
```
docker start --name container-name
```
Stop a running existing container:
```
docker stop --name container-name
```
Open an interactive terminal inside a container:
```
docker exec -it --name container-name
```

Manage volumes

Create a Docker volume:
```
docker volume create volume-name
```
Run a Docker in a particular volume mapped to "/work" inside the container:
```
docker run -d -it -v workvol1:/work puppet-agent /bin/bash
```
Display details of a volume:
```
docker volume inspectvolume-name
```
List all the volumes in the system:
```
docker volume ls
```
Remove a volume:
```
docker volume rm volume-name
```

Docker Management

List all running Docker containers:
```
docker ps
```
List all running and stopped Docker containers:
```
docker ps -a
```
Remove a Docker container:
```
docker rm container-name
```
Remove a Docker image:
```
docker rmi image-name
```
Remove unused Docker images:
```
docker image prune
```
Remove unused Docker volumes:
```
docker volume prune
```
Remove all unused containers, images, and networks:
```
docker system prune
```
Run a Docker container with a certain amount of memory:
```
docker run -d --memory="size" container-name
```

Run a Docker container, and restrict its CPU usage:

docker run -d --cpus="processor-allocation-precentage" container-name

For more information about Docker-CE commands, see the Docker-CE documentation.

Welcome

Welcome to Dell

Dell SmartFabric OS10 User Guide Release 10.5.3

Containers

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