Describe how to scale up and down

[grtjn]

Bit convoluted. Scaling up should be:

• increase nr-hosts in project.properties
• vagrant up --no-provision
• vagrant provision

Noticed some issues though extra hosts not properly being added to cluster. Haven't tried to reproduce, feedback welcome.

Scaling down requires different approach:

• drop host from cluster using admin ui
• then to really get rid of node: vagrant destroy on last node (always last)
• decrease nr-hosts in project.properties

Add this to the README somewhere.. (and more feedback welcome!)

[grtjn]

Scaling up:

• vi project.properties, increase nr_hosts
• vagrant status, make note of names of not-created vms
• vagrant up --no-provision {names of 'not-created' vms}
• vagrant host-manager (will run across all vms and host to update hosts tables with new vms)
• vagrant provision {names of 'not-created' vms}

Scaling down:

• vagrant status, make note of last vm name
• go to admin UI on last vm (http://lastvmname:8001/)
• click on host details of that host, select Leave
• vagrant destroy {lastvmname}
• vi project.properties, decrease nr_hosts setting

Note: you can scale down multiple hosts, but make sure remove vms from last to first. VM names are calculated by incrementing from 1 to nr_hosts.