Added some more stuff

docker/docker_basics.md

@@ -20,3 +20,10 @@
 
 	docker container ls
 
+# No need for Sudo
+
+	sudo usermod -aG docker pi
+
+Shadow group reload
+
+	sg docker -c "bash"

general.md

@@ -5,3 +5,11 @@ This will let you call those scripts from outside of their directory
     export PATH=<path>:$PATH
 
 To make this permanent it needs adding into a dotfile, ie .bashrc
+
+# Resource a file
+
+	source ~/.bashrc
+
+Recommended usage as below
+
+	. ~/.bashrc

linux/swappiness.md

@@ -0,0 +1,15 @@
+# Swappiness
+
+# Clear Swap
+
+	sudo swapoff -a; sudo swapon -a
+
+# Check swapiness
+
+	cat /proc/sys/vm/swappiness
+
+This is recommended to be ~10, but many times it's set to 60
+
+# Change swapiness
+
+	sudo sysctl vm.swappiness=10

server/server_essentials.md

@@ -0,0 +1,32 @@
+# Server Essentials
+
+## Enable SSH
+
+To connect to your server non-physically set up SSH.
+
+## Set up a new user
+
+Don't use the admin user. If your server has a default user (e.g RPI)
+it's recommended to remove that user.
+
+`useradd <user> -s /bin/bash/ -m -G adm, sudo`
+`passwd <user>`
+
+`userdel pi`
+`rm -rf /home/pi`
+
+## Change hostname
+
+Edit `/etc/hosts` and `/etc/hostname` then reboot
+Use SSH-keys to login
+
+### Allow server to be found by hostname
+
+`sudo systemctl status avahi-daemon` Check this is running
+If it is, great. The server should connect via `user@host` or `user@host.local`
+
+## Set a static IP
+
+## Enable SSH keys
+
+### Disable password logins