This tutorial assumes that you have also installed Vagrant.
## Lab Defaults
The labs have been configured with the following networking defaults. If you change any of these after you have deployed any of the lab, you'll need to completely reset it and start again from the beginning:
To change this, edit the [Vagrantfile](../vagrant/Vagrantfile) in your cloned copy (do not edit directly in github), and set the new value for the network prefix at line 9. This should not overlap any of the other network settings.
Note that you do not need to edit any of the other scripts to make the above change. It is all managed by shell variable computations based on the assigned VM IP addresses and the values in the hosts file (also computed).
It is *recommended* that you leave the pod and service networks with the following defaults. If you change them then you will also need to edit one or both of the CoreDNS and Weave networking manifests to accommodate your change.
### Pod Network
The network used to assign IP addresses to pods is `10.244.0.0/16`.
To change this, open all the `.md` files in the [docs](../docs/) directory in your favourite IDE and do a global replace on<br>
`POD_CIDR=10.244.0.0/16`<br>
with the new CDIR range. This should not overlap any of the other network settings.
### Service Network
The network used to assign IP addresses to Cluster IP services is `10.96.0.0/16`.
To change this, open all the `.md` files in the [docs](../docs/) directory in your favourite IDE and do a global replace on<br>
`SERVICE_CIDR=10.96.0.0/16`<br>
with the new CDIR range. This should not overlap any of the other network settings.
Additionally edit line 164 of [coredns.yaml](../deployments/coredns.yaml) to set the new DNS service address (should still end with `.10`)
## Running Commands in Parallel with tmux
[tmux](https://github.com/tmux/tmux/wiki) can be used to run commands on multiple compute instances at the same time. Labs in this tutorial may require running the same commands across multiple compute instances, in those cases consider using tmux and splitting a window into multiple panes with synchronize-panes enabled to speed up the provisioning process.
> The use of tmux is optional and not required to complete this tutorial.
> Enable synchronize-panes by pressing `CTRL+B` followed by `"` to split the window into two panes. In each pane (selectable with mouse), ssh to the host(s) you will be working with.</br>Next type `CTRL+X` at the prompt to begin sync. In sync mode, the dividing line between panes will be red. Everything you type or paste in one pane will be echoed in the other.<br>To disable synchronization type `CTRL+X` again.</br></br>Note that the `CTRL-X` key binding is provided by a `.tmux.conf` loaded onto the VM by the vagrant provisioner.
