<commit_before>###How to prepare before attending a hackday or workshop?

##### Minimum hardware / OS platform / software requirements

##### Download supporting software


##### Build VM


##### Build Containers


##### Check VM


##### Check Containers


##### Verify installation and environment<commit_msg>Update prepare-before-hackday.md<commit_after>###How to prepare before attending a hackday or workshop?

##### Minimum hardware / OS platform / software requirements
Below is the minimum hardware requirements to build or use VMs:

    64-bit CPU running a 64-bit OS
    10-15 GB free disk space
    laptop fast enough to run a VM on it
    VirtualBox installed
    understanding of Java
    some knowledge of the OpenJDK



##### Download supporting software


##### Build VM


##### Check VM

or

##### Build Containers


##### Check Containers


##### Verify installation and environment
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