volume2volume

volume2volume is a command line interface tool which helps openshift users to migrate their data between different openshift clusters or providers.

volume2volume will be connected to two clusters (old cluster and new cluster) and with simple commands will identify all the volumes in both clusters, pairs these volumes and make the backup the volumes of the old cluster and recovery of these data in the the new cluster. volume2volume uses the command line client of openshift, oc, to communicate between the openshift clusters and stash for the backup and recovery of the data.

A unique advantage of volume2volume is that it combines multiple steps into a convenient workflow for the migration of data volumes, including backup and recovery of the data.

volume2volume is a prototype from the Cloud-Native Applications research initiative of the Service Prototyping Lab at Zurich University of Applied Sciences. Use with care, things may break. We will share our findings on cloud application migration at a later point in time.

Use Case

Use the command help to see the list of command and the description of them.

With backup, you will create the restic objects to do the backup of the volumes. (in the old cluster). With backUpVolume, you will create the restic objects to do the backup of one volumes. (in the old cluster). With findVolumes, you will identify the volumes in the two clusters and make the pairs. With init, you will initialize the cluster to get ready for stash objects. With migrate, you will combine the findVolumes, backup and recovery commands. With migrateVolume, you will combine the findVolumes, backUpVolume and recoveryVolume commands. With recovery, you will create the recovery objects to upload the data to the volumes. (in the new cluster). With recoveryVolume, you will create the recovery object of one volume to upload the data to this volume. (in the new cluster). With showMigration, show the volumes migrated. With showVolumes, show the volumes that were paired.

The configuration can be added in ~/.volume2volume.yaml or directly using the flags. Use help to see all the flags. If no configuration is given to the tool, it will take the default values.

    volume2volume help
    volume2volume findVolumes
    volume2volume backup
    volume2volume up
    volume2volume ...

Installation

Install kubectl

• https://kubernetes.io/docs/tasks/tools/install-kubectl/

Install oc

• https://docs.openshift.org/latest/cli_reference/get_started_cli.html#installing-the-cli

From binary

Install the binary: volume2volume

Download the binary from /binaries/< your operative system> and run:

    chmod +x volume2volume
    sudo mv ./volume2volume /usr/local/bin/volume2volume

From source

    git clone <this repository>
    mv volume2volume $GOPATH/src/volume2volume
    go install volume2volume

With Docker (Not necessary oc and kubectl)

Dockerfile

Create the docker image using the dockerfile and connect later to the container for use volume2volume.

DockeHub image

Run docker pull mohammedalameen94/vol2vol to get the container image.

First steps

Note: Working to setup the clusters using Ansible.

This small example shows how to migrate the data in the volumes of an OpenShift application from a local OpenShift development cluster to APPUiO, the Swiss Container Platform.

    volume2volume migrate \
          --clusterFrom https://127.0.0.1:8443 --clusterTo https://console.appuio.ch:443 \
          --projectFrom test --projectTo test \
          --usernameFrom user --usernameTo user \
          --passwordFrom pass --passwordTo pass

Considering the large number of options, it is advised to use the configuration file ~/.volume2volume.yaml to store all parameters (in YAML syntax).