'keys' does not handle special keys (like ^J) anymore.
Instead, we should use `key`, which will pass its entire
argument to tmux, without any processing. It is therefore
possible to do something like:
```key ^C```
Or
```key Escape```
Most (if not all) calls to special keys have been
converted to use 'key' instead of 'keys'.
Action ```copypaste``` has been deprecated in favor
of three separate actions:
```copy REGEX``` (searches the regex in the active pane,
and if found, places it in an internal clipboard)
```paste``` (inserts the content of the clipboard as
keystrokes)
```check``` (forces a status check)
Also, a 'tmux' command has been added. It allows to
do stuff like:
```tmux split-pane -v```
In a few places, we were using 'Persistent Volume' the
wrong way. This was fixed.
Also added a whole chapter showing how to use local
persistent volumes, with an actually persistent
Consul cluster.
Consul 1.4 introduces Cloud auto-join, which finds the
IP addresses of the other nodes by querying an API (in
that case, the Kubernetes API).
This involves creating a service account and granting
permissions to list and get pods. It is a little bit
more complex, but it reuses previous notions (like RBAC)
so I like it better.
In this section, we setup Portworx to have a dynamic provisioner.
Then we use it to deploy a PostgreSQL Stateful Set.
Finally we simulate a node failure and observe the failover.
- explain the reason why we have stateful sets
- explain the relationship between volumes, persistent volumes,
persistent volume claims, volume claim templates
- show how to run a Consul cluster with a stateful set
