Add tmux

src/SUMMARY.md

@@ -25,3 +25,4 @@
     - [Docker](./ops/tools/docker.md)
     - [MongoDB](./ops/tools/mongodb.md)
     - [OpenSSL](./ops/tools/openssl.md)
+    - [Tmux](./ops/tools/tmux.md)

src/ops/tools/tmux.md

@@ -0,0 +1,30 @@
+# Tmux
+
+El famoso terminal multiplexer _(sorry not sorry but screen is a piece of shit)_.
+
+## Sync panels
+
+Sync panels can be quite usefull to do the same tasks on a different set of servers.
+
+### `tmux.conf` file
+
+```conf
+[...]
+unbind S
+bind S set-windows-option synchronize-panes
+[...]
+```
+
+### How to use it
+
+Typical use case can be updating let's say 3 Debian servers.
+
+1. start tmux
+1. split in 3, use ssh to connect to the targets[^1].
+1. use `bind prefix + S` to activate sync[^2]
+1. `apt update && apt upgrade`
+1. And voilà !
+
+[^1]: a dedicated session can be used to automate stuff, more on that later...
+
+[^2]: by default, Ctrl + b