K8s multi node cluster with wasm support

Supported OS:

• Ubuntu 20.04
• Ubuntu 22.04

Container Runtime:

• High-Level: containerd
• Low-Level: crun with WasmEdge Support

Usage

Development environment

Before building the cluster, you need to install following:

• Ansible
• VirtulaBox
• Vagrant

Then, in this directory:

1. vagrant up
2. cd ansible
3. ansible-playbook -i inventories/vagrant_vm master_playbook.yml
4. ansible-playbook -i inventories/vagrant_vm worker_playbook.yml

When successfully completed, join-command is created in ansible.

Run wasm sample app

1. vagrant ssh master
2. kubectl create -f /vm_share/wasm-sample-app.yml

You can see the output by executing kubectl logs wasm-sample-app.

Note

When you run vagrant up, an error about IP range may occur like this:

The IP address configured for the host-only network is not within the
allowed ranges. Please update the address used to be within the allowed
ranges and run the command again.

  Address: 192.168.50.10
  Ranges: 192.168.56.0/21

Valid ranges can be modified in the /etc/vbox/networks.conf file. For
more information including valid format see:

  https://www.virtualbox.org/manual/ch06.html#network_hostonly

You can solve this by adding following line in /etc/vbox/networks.conf (you need to create this file if it doesn't exist):

* 0.0.0.0/0 ::/0

Production environment

Before building the cluster, you need to install Ansible.

Then, in this directory:

1. Create an ansible inventory file in ansible/inventories (refer to Ansible Docs if you don't know inventory file)
2. cd ansible
3. Make sure ansible all -i "path/to/inventory/file" -m ping is success
4. ansible-playbook -i "path/to/inventory/file" master_playbook.yml
5. ansible-playbook -i "path/to/inventory/file" worker_playbook.yml