Docker is a software technology that provides operating-system-level virtualization. In this page, we present some tools that are specifically designed to use Docker on Grid'5000.
Installing Docker from a node
You can install and use Docker from a node with the standard environment by following these instructions:
- Reserve a node
(you can also use option
-t deploy and Kadeploy if you prefer)
- Install Docker
The script g5k-setup-docker, available from the standard environment, installs Docker locally. Option -c makes docker command available without needing to log out and reconnect to the node
g5k-setup-docker can also call sudo-g5k internally, so it is possible to simply type
- Run Docker
You can now check that Docker is up and running
- Note for the environments nfs and big
In addition to the standard environment, g5k-setup-docker works with the environments debian9-x64-nfs and debian9-x64-big (but not with the environments jessie-x64-nfs and jessie-x64-big). The directory where g5k-setup-docker is located is not defined in the $PATH of the environments nfs and big: when using them, you must call the script from its full path, i.e.
Using docker-machine and docker-g5k
The Spirals Team in Lille developped two tools to ease Docker usage on Grid'5000:
- a docker-machine driver
- the docker-g5k program
Provision a node with docker-machine
The driver for docker-machine allows you to reserve a node on Grid'5000 and to install a Linux image and Docker Engine on it, from your computer and in one single command.
The reserved node is then available from commands like
docker-machine ssh (standard ssh commands don't work when nodes are reserved with docker-machine).
Create a Swarm with docker-g5k
The docker-g5k program allows you to reserve several nodes, possibly on different sites, and to install a Linux image and Docker Engine on each node, in one single command. This command configures a Swarm, i.e. a set of Docker containers distributed over several nodes that communicate with each other.
Managing Docker images
One difficult aspect of using Docker is efficient images management, as (1) it is often required to load such images on many nodes simultaneously; (2) Grid'5000 connection to the internet is limited to 1 Gbps. The following strategies are recommended to manage Docker images:
Use docker load/save
To load and save images quickly, we encourage you to use
docker load and
docker save commands, with .tar docker images stored in your Grid'5000 home. Users home are NFS mounted, with good network performance.
You can also use
docker load command instead of retrieving the image from Docker Hub, when deploying a Swarm with docker-g5k.
- Example with docker-g5k
Give read rights to your image
Deploy three Docker nodes in Nancy (activate the Grid'5000 VPN before launching this command)
Load Alpine image on each node
Use Inria private registry
Use a persistent VM
If you want to benefit from a private registry with good network performance, and are ready to manually install your own registry, you can request a Persistent Virtual Machine. You can look at Harbor or Portus open source projects, in order to install your own registry.