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setup-alpine.md

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Alpine

For our Kubernetes lab we will be using the Alpine Distro since it is a tiny Distro and doesn't take up too much to run.

YOU WILL NEED TO MAKE 7 of these!!

  • 1 NGINX LB
  • 3 Node (master servers)
  • 3 Worker nodes

Download Alpine

Download Alpine from "https://www.alpinelinux.org/downloads/" Download the "Standard" version for your architecture.

Install Alpine

Once it is downloaded, load the ISO, or burn it to a flash drive using etcher "https://www.balena.io/etcher/"

Boot from the ISO or USB. For the username use root - no password is needed Then run:

setup-alpine

Follow the instructions but this should get you through

  • us
  • us (its going to ask for an alternative keyboard)
  • kb-server-1 Replace server with worker for a worker node and 1 to the number you want. Also for the Nginx LB name it nginx-lb

Many of these i just hit enter on for the defaults

  • eht0
  • dhcp Using DHCP for now just to get it to work we will set a static address later
  • no
  • <root_password>
  • <confirm_root_password>
  • UTC or whatever timezone you're in
  • none
  • chrony
  • 1
  • openssh
  • sda whatever disk you want to use
  • sys or lvm
  • y
  • reboot

Configure Alpine

Update and upgrade alpine and install curl

apk update && apk upgrade

apk add curl vim

Since were running Alpine you will need to do some additional preparation, from the official K3s docs.

Update the /etc/update-extlinux.conf file by adding(you will add it to what is already there for example mine says default_kernel_opts="pax_nouderef quiet rootfstype=ext4 so i just add the cgroup etc to that line.):

default_kernel_opts="...  cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory"

then run

update-extlinux

IP GUIDE

Server IP Address
NGINX-LB 192.68.22.100
KB-Server-1 192.68.22.101
KB-Server-2 192.68.22.102
KB-Server-3 192.68.22.103
KB-Worker-1 192.68.22.111
KB-Worker-2 192.68.22.112
KB-worker-3 192.68.22.113
... ...

Lets go ahead and set a static address, again replacing it with your configuration for each server open /etc/network/interfaces and replace the line that says iface eth0 inet dhcp to:

iface eth0 inet static
        address 192.168.22.100
       netmask 255.255.255.0
        gateway 192.168.22.2

Finally reboot

reboot

That's it!

Additional Configuration

SSHD

It might be a pain to have to write everything through the console, alpine has sshd installed and running but you cant login with the root user unless you make some changes

Edit the /etc/ssh/sshd_config file by:

Uncommenting the line

#PermitRootLogin prohibit-password

and change prohibit-password to yes as shown below

PermitRootLogin yes

then restart sshd

service sshd restart

now you should be able to ssh in.