added more content to the post

content/posts/building-a-docker-swarm-with-pis.md

@@ -18,7 +18,7 @@ showtoc: true
 searchHidden: false
 ---
 
-## **Introduction**
+## **Intro**
 The _Raspberry Pi_ from it's first iteration has been a great hit.
 Adopted by many as the computer of choice for projects, and for
 very good reason. The Pi is a fully fledged computer that fits in
@@ -47,12 +47,12 @@ than a Pi cluster.
 
 ![Insert Image of cluster here]()
 
-### **Goal of this post**
+### **Point of this post**
 Hopefully after following this post you will have setup _Docker
 swarm_ on a cluster of Pis **- stay even if you currently only have
 one -** and understand how to bend it to your will 🦾. 
 
-### **Why** ***Docker Swarm***
+### **Why** ***Docker Swarm*** 🧐
 While we can manage each docker node - _Raspberry Pi_ - individually
 , **_Docker swarm_ enables us to manage all the devices from a single
 main node** making managing the cluster a lot easier.
@@ -105,29 +105,68 @@ have 4 8GB nodes then you have a combined total of:
 * Use smaller SD Cards try not to go below 32GB (Reccomended 64GB If money saved elsewhere)
 
 ## **BUILD TIME !!**
+Pull yourself up by your bootstraps were jumping into this one
+runnig 💨
+
 ### **Image the SD Cards**
 So interesting fact the CPUs used in the raspberry pi 4 use an ARM64
-archetecture meaning they're 64bit. When looking for images of
-Raspbian you will only find 32bit variants which will work however 
-will not make use of all the hardware which is just a waste. 64bit
-images exist however are well hidden, Dont fear 😨 **you can download
-the latest images from the [raspberrypi.org index](https://downloads.raspberrypi.org/raspios_arm64/images/)**
+archetecture. When looking for images of Raspbian you will only find
+32bit variants which will work however will not make use of all the
+hardware which is just a waste. 64bit images exist however are well
+hidden, Dont fear 😨 **you can download the latest images from the 
+[raspberrypi.org index](https://downloads.raspberrypi.org/raspios_arm64/images/)**
 
-To write the cards I use the Raspberry Pi imager [available here](https://www.raspberrypi.com/software/).
-once that is installed and you have the 64bit raspbian image
-downloaded do the following:
-1. Click CHOOSE OS
-    1. Click Use custom
-    2. Select the 64bit rasbian image and open
-2. Click CHOOSE STORAGE
-    1. Select storage device
-3. Click WRITE
+To write the cards I use the [**Raspberry Pi imager**](https://www.raspberrypi.com/software/).
+once you have **rpi-imager** installed and you have the 64bit raspbian
+image, open ```sudo rpi-imager``` and on the "CHOOSE OS" section go to
+the bottom and select use custom image.
 
-We dont need to unzip the file as the tool is clever enough to
+> We dont need to unzip the file as the tool is clever enough to
 handle that for us
 
-**repeat steps for number of cards you have**
+**Before removing the SD card, mount the boot partition - usually the
+first partition, look for a file called cmdline.txt - and create an
+empty file called ssh** ```sudo touch ssh``` this basically enables
+SSH on the Pis first boot allowing us to access the Pis in a totally
+headless manner.
 
 ### Assemble the cluster
+So assembly is very dependant on the kit you bought, and more
+often than not the stuff needed here comes with instructions or is
+self explanitory. So go ahead and assemble the cluster 🛠
+
+**There is an order of operations that I reccomend:**
+* Install PoE hats onto the Pis
+* Install the SD Cards into the Pis
+* Assemble the case and install Pis
+* plug in ethernet cables
+
+**Now allow the Pis to boot for a few minutes so it can resize the
+file system**
+
+### **Sort out the Network bits**
+This is the easy part, there are two methods we can use to set a
+static IP address, one is on your DHCP server and the other is on
+the device itself. Personally I prefer to set static IPs on the
+device itself so I will cover that here.
+
+To find the current ip of your Pis you can go to your DHCP server
+and look for the DHCP leases for the Pis.
+
+**SSH to the Pi** then open and edit the following files
+* /etc/hosts
+    * edit this line with your hostname: ```127.0.1.1  mainpi```
+* /etc/hostname
+    * edit this file with your hostname: ```mainpi```
+* /etc/dhcpcd.conf
+    * knowing we will be using only static IPs here I delete
+    everything in the file add the following
+    *   ```
+        interface eth0
+        static ip_address=10.10.10.20/24
+        static routers=10.10.10.1
+        static domain_name_servers=10.10.10.1
+        ```
+**Now reboot the pi** ```sudo shutdown -r now```