ansible.md

Ansible

All these commands are run from your computer, not the RPi.

Copy and update inventory and vars.yml

# Update inventory with your RPi IP addresses and hostnames
cp ansible/inventory.example ansible/inventory
# Update ansible_user to the user you used when you flashed Ubuntu
cp ansible/vars.example.yml ansible/vars.yml

1. Check RPis are ready to run accept Ansible

Note: Prefix with watch command to view realtime

# Check they are connectable
env ANSIBLE_CONFIG=ansible/ansible.cfg ansible \
    -i ansible/inventory \
    k3s_cluster -m ping

# Check that sudo is not blocked, if this return value is not 0 wait until it is
env ANSIBLE_CONFIG=ansible/ansible.cfg ansible \
    all -i ansible/inventory -m shell -a "test /var/lib/dpkg/lock-frontend && echo \$?"

2. Run playbook

Note: Run this when all RPis are online

env ANSIBLE_CONFIG=ansible/ansible.cfg ansible-playbook \
    -i ansible/inventory \
    ansible/playbook.yml

3. Provision USB drive

Note: Run this when all RPis are online

Important: Running this requires a USB drive inserted into each Pi, this playbook will format the ENTIRE flash storage

env ANSIBLE_CONFIG=ansible/ansible.cfg ansible-playbook \
    -i ansible/inventory \
    ansible/playbook-usbdrive.yml

Check Temp of all RPis

Note: This should be below 70.0'C for good performance

env ANSIBLE_CONFIG=ansible/ansible.cfg ansible \
    all -i ansible/inventory -m shell -a "/opt/vc/bin/vcgencmd measure_temp"

Check overclock value of all RPis

Note: This should be 175000

env ANSIBLE_CONFIG=ansible/ansible.cfg ansible \
    all -i ansible/inventory -m shell -a "cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq"

Reboot the RPis

env ANSIBLE_CONFIG=ansible/ansible.cfg ansible -b \
    all -i ansible/inventory -m shell -a "/sbin/shutdown -r now"

Shutdown the RPis

env ANSIBLE_CONFIG=ansible/ansible.cfg ansible -b \
    all -i ansible/inventory -m shell -a "/sbin/shutdown -h now"

Uninstall k3s

# master and workers
env ANSIBLE_CONFIG=ansible/ansible.cfg ansible -b \
      all -i ansible/inventory -m shell -a "/usr/local/bin/k3s-killall.sh"

# master
env ANSIBLE_CONFIG=ansible/ansible.cfg ansible -b \
      all -i ansible/inventory -m shell -a "/usr/local/bin/k3s-uninstall.sh"

# workers
env ANSIBLE_CONFIG=ansible/ansible.cfg ansible -b \
      all -i ansible/inventory -m shell -a "/usr/local/bin/k3s-agent-uninstall.sh"