From 2238814e3cfd78f783f39b707c77dcebca2b26be Mon Sep 17 00:00:00 2001
From: Wilfried OLLIVIER <wollivier@bearstech.com>
Date: Sun, 7 Jul 2019 15:28:43 +0200
Subject: [PATCH] Add tmux

---
 src/SUMMARY.md        |  1 +
 src/ops/tools/tmux.md | 30 ++++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)
 create mode 100644 src/ops/tools/tmux.md

diff --git a/src/SUMMARY.md b/src/SUMMARY.md
index f9e2a5e..c25a48e 100644
--- a/src/SUMMARY.md
+++ b/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)
diff --git a/src/ops/tools/tmux.md b/src/ops/tools/tmux.md
new file mode 100644
index 0000000..2410459
--- /dev/null
+++ b/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