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--- ubuntu:pi [2021-01-23 16:09] – line wrap gabriel
+++ ubuntu:pi [2021-02-08 16:27] (current) – [Configuring RTC on Ubuntu 20.04 LTS] formatting gabriel
@@ Line 38: / Line 38: @@
 # optional: remove cloud-init completely
 apt-get purge cloud-init
-rm -rf /var/lib/cloud/*
 # if you do not remove cloud-init be sure not to allow your
 # configuration to be overwritten in future updates to the package
 </code>
-Make sure not to overwrite the cloud-init config if you
+Another option is to create a small 1Mb partition after your root partition to ensure that it can never be grown into the empty space on your SD card.
 Next do the following:
-  * set hostname
+<code>
-  * Install python for Ansible
+# disable the unattended upgrades service (you can re-enable later if you prefer)
-  * configure /etc/netplan/99-config.yaml
+systemctl disable unattended-upgrades
-  * run ubuntu_ansible_control.yml playbook to update to most recent profile
+# install python for Ansible
+apt install python
-Add the following to Ansible plays in the future:
+# set editor to Vim (optional)
+update-alternatives --config editor
- * disable ipv6
+# set a hostname
- * timezone
+echo "$MYHOSTNAME" > /etc/hostname
- * default editor
- * prune packages
- * sshd config
- * disable ubuntu account or remove
- * configre motd
+# don't forget to update /etc/hosts
+</code>
+Configure network interface for static use:
+<code>
+# /etc/netplan/99-static.yaml
+network:
+    version: 2
+    renderer: networkd
+    ethernets:
+        eth0:
+            addresses:
+                - 10.1.2.3/24
+            gateway4: 10.1.2.1
+            link-local: [ ]
+            nameservers:
+                search: [subnet.quay.net, quay.net]
+                addresses:
+                    - 10.1.2.53
+</code>
+Test netplan configuration:
+<code>
+netplan try
+# if that works, remove any other config files and run:
+netplay apply
+# once successfully tested you should also remove the default config from cloud-init
+# (add to Ansible playbook in future)
+rm -f /etc/netplan/50-cloud-init.yaml
+</code>
+==== Ansible playbooks ====
+<code>
+# standard configuration for all Raspberry Pi systems
+# this playbook does the following:
+#  - base configurations (raspi_ubuntu)
+#  - time service config (chrony)
+#  - firewall config (nftables)
+ansible-playbook -l raspi.in.quay.net raspi_ubuntu.yml
+# regenerate SSHD keys on host after build
+# NOTE: Ubuntu ships with a default set of SSHD keys
+ansible-playbook -l raspi.in.quay.net regen_sshd_keys.yml
+</code>
+Add the following to Ansible plays in the future:
+  * default editor
+  * prune packages
+  * configre motd
+  * apt install lm-sensors
 ===== Hardware notes =====
 Quick reference for Raspberry Pi hardware tools on Ubuntu.
+==== Configuring RTC on Ubuntu 20.04 LTS ====
+<code>
+# Install the I2C tools to access the bus and configure your RTC
+apt install i2c-tools
+# Enable your RTC in the Pi boot config
+RTCMODEL=ds3231
+echo "dtoverlay=i2c-rtc,$RTCMODEL" >> /boot/firmware/usercfg.txt
+# show I2C bus config
+#  - 68 = hardware detected
+#  - UU = dtoverlay configured correctly and driver is loaded
+i2cdetect -y 1
+</code>
+//Reference: [[https://pimylifeup.com/raspberry-pi-rtc/|Raspberry Pi RTC: Adding a Real Time Clock//
 ===== Reference =====
@@ Line 76: / Line 145: @@
   * [[https://elinux.org/RPiconfig|RPiconfig]]
   * [[https://ubuntu.com/download/raspberry-pi|Ubuntu Raspberry Pi Downloads]]
+  * [[https://ubuntu.com/tutorials/how-to-install-ubuntu-on-your-raspberry-pi#1-overview|How to install Ubuntu Server on your Raspberry Pi]]
+  * [[https://netplan.io/examples/|Netplan configuration examples]]