🎉 initial commit (first draft)

.github/workflows/terraform.yaml

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+name: 'Terraform GitHub Actions'
+
+on:
+  pull_request:
+
+jobs:
+  terraform-fmt:
+    name: Terraform Format
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/[email protected]
+
+      - name: Setup Terraform
+        uses: hashicorp/setup-terraform@v1
+
+      - name: Terraform Format
+        id: fmt
+        run: terraform fmt -diff -check -no-color -recursive
+        continue-on-error: true
+
+      - uses: actions/github-script@v4
+        if: github.event_name == 'pull_request' && steps.fmt.outputs.exitcode != 0
+        env:
+          TF_FMT_STDOUT: "${{ steps.fmt.outputs.stdout }}"
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const output = `#### Terraform Format and Style 🖌 - \`${{ steps.fmt.outcome }}\`
+            \`\`\`diff
+            ${process.env.TF_FMT_STDOUT}
+            \`\`\`
+            *Pusher: @${{ github.actor }}, Action: \`${{ github.event_name }}\`, Workflow: \`${{ github.workflow }}\`*`;
+            github.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: output
+            })
+            throw "failed to run `terraform fmt -check -recursive -diff`"

.gitignore

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+.terraform.*
+.terraform/
+terraform.tfstate*
+terraform.tfvars
+terraform.txt
+.auto.tfvars
+creds/
+.vscode/
+debug.log

LICENSE

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+Copyright © 2022 AIGIS (Lotus Labs Ltd), Colin Wilson
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

agents.tf

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+# Create initial K3s server node
+resource "hcloud_server" "agent_node" {
+
+  for_each = local.agent_nodes
+
+  name               = "k3s-agent-${each.value.nodepool_name}-${each.value.location}-${random_id.agent_node_id[each.value.index].hex}"
+  image              = "ubuntu-22.04"
+  server_type        = each.value.server_type
+  placement_group_id = element(hcloud_placement_group.k3s_agent_placement_group.*.id, ceil(each.value.index / 10))
+  firewall_ids       = [hcloud_firewall.k3s.id]
+  location           = each.value.location
+  ssh_keys           = [var.ssh_public_key_name]
+  labels = {
+    provisioner = "terraform",
+    engine      = "k3s"
+    type        = "agent"
+  }
+  # Prevent destroying the whole cluster if the user changes any of the attributes
+  # that force to recreate the servers or network ip's/mac addresses.
+  lifecycle {
+    ignore_changes = [
+      location,
+      network,
+      ssh_keys,
+      user_data,
+    ]
+  }
+  network {
+    network_id = hcloud_network.k3s_net.id
+    #ip         = "10.1.0.3"
+  }
+  user_data = templatefile("${path.module}/user_data/agent/agent.yaml.tftpl", {
+    k3s_channel = each.value.channel
+    agent_config = base64gzip(yamlencode({
+      server        = "https://${hcloud_load_balancer_network.k3s_network.ip}:6443"
+      token         = random_password.k3s_agent_token.result
+      flannel-iface = "ens10"
+      kubelet-arg   = ["cloud-provider=external"]
+      node-label    = each.value.labels
+    }))
+  })
+  provisioner "remote-exec" {
+    inline = [
+      "cloud-init status --wait --long > /dev/null" # wait for cloud-init to complete
+    ]
+
+    connection {
+      host        = self.ipv4_address
+      type        = "ssh"
+      user        = "root"
+      private_key = var.ssh_private_key
+    }
+  }
+  depends_on = [
+    hcloud_server.server_node_init
+  ]
+}

code_of_conduct.md

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+
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our
+community a harassment-free experience for everyone, regardless of age, body
+size, visible or invisible disability, ethnicity, sex characteristics, gender
+identity and expression, level of experience, education, socio-economic status,
+nationality, personal appearance, race, caste, color, religion, or sexual
+identity and orientation.
+
+We pledge to act and interact in ways that contribute to an open, welcoming,
+diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behaviour that contributes to a positive environment for our
+community include:
+
+* Demonstrating empathy and kindness toward other people
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Accepting responsibility and apologizing to those affected by our mistakes,
+  and learning from the experience
+* Focusing on what is best not just for us as individuals, but for the overall
+  community
+
+Examples of unacceptable behaviour include:
+
+* The use of sexualized language or imagery, and sexual attention or advances of
+  any kind
+* Trolling, insulting or derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or email address,
+  without their explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Enforcement Responsibilities
+
+Community leaders are responsible for clarifying and enforcing our standards of
+acceptable behaviour and will take appropriate and fair corrective action in
+response to any behaviour that they deem inappropriate, threatening, offensive,
+or harmful.
+
+Community leaders have the right and responsibility to remove, edit, or reject
+comments, commits, code, wiki edits, issues, and other contributions that are
+not aligned to this Code of Conduct, and will communicate reasons for moderation
+decisions when appropriate.
+
+## Scope
+
+This Code of Conduct applies within all community spaces, and also applies when
+an individual is officially representing the community in public spaces.
+Examples of representing our community include using an official e-mail address,
+posting via an official social media account, or acting as an appointed
+representative at an online or offline event.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behaviour may be
+reported to the community leaders responsible for enforcement at
+[email protected].
+All complaints will be reviewed and investigated promptly and fairly.
+
+All community leaders are obligated to respect the privacy and security of the
+reporter of any incident.
+
+## Enforcement Guidelines
+
+Community leaders will follow these Community Impact Guidelines in determining
+the consequences for any action they deem in violation of this Code of Conduct:
+
+### 1. Correction
+
+**Community Impact**: Use of inappropriate language or other behaviour deemed
+unprofessional or unwelcome in the community.
+
+**Consequence**: A private, written warning from community leaders, providing
+clarity around the nature of the violation and an explanation of why the
+behaviour was inappropriate. A public apology may be requested.
+
+### 2. Warning
+
+**Community Impact**: A violation through a single incident or series of
+actions.
+
+**Consequence**: A warning with consequences for continued behaviour. No
+interaction with the people involved, including unsolicited interaction with
+those enforcing the Code of Conduct, for a specified period of time. This
+includes avoiding interactions in community spaces as well as external channels
+like social media. Violating these terms may lead to a temporary or permanent
+ban.
+
+### 3. Temporary Ban
+
+**Community Impact**: A serious violation of community standards, including
+sustained inappropriate behaviour.
+
+**Consequence**: A temporary ban from any sort of interaction or public
+communication with the community for a specified period of time. No public or
+private interaction with the people involved, including unsolicited interaction
+with those enforcing the Code of Conduct, is allowed during this period.
+Violating these terms may lead to a permanent ban.
+
+### 4. Permanent Ban
+
+**Community Impact**: Demonstrating a pattern of violation of community
+standards, including sustained inappropriate behaviour, harassment of an
+individual, or aggression toward or disparagement of classes of individuals.
+
+**Consequence**: A permanent ban from any sort of public interaction within the
+community.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage],
+version 2.1, available at
+[https://www.contributor-covenant.org/version/2/1/code_of_conduct.html][v2.1].
+
+Community Impact Guidelines were inspired by
+[Mozilla's code of conduct enforcement ladder][Mozilla CoC].
+
+For answers to common questions about this code of conduct, see the FAQ at
+[https://www.contributor-covenant.org/faq][FAQ]. Translations are available at
+[https://www.contributor-covenant.org/translations][translations].
+
+[homepage]: https://www.contributor-covenant.org
+[v2.1]: https://www.contributor-covenant.org/version/2/1/code_of_conduct.html
+[Mozilla CoC]: https://github.com/mozilla/diversity
+[FAQ]: https://www.contributor-covenant.org/faq
+[translations]: https://www.contributor-covenant.org/translations
+

firewall.tf

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+resource "hcloud_firewall" "k3s" {
+  name = "k3s-cluster"
+
+  dynamic "rule" {
+    for_each = concat(local.base_firewall_rules)
+    content {
+      direction       = rule.value.direction
+      protocol        = rule.value.protocol
+      port            = lookup(rule.value, "port", null)
+      destination_ips = lookup(rule.value, "destination_ips", [])
+      source_ips      = lookup(rule.value, "source_ips", [])
+    }
+  }
+}

k3s_tokens.tf

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+resource "random_password" "k3s_token" {
+  length  = 48
+  upper   = false
+  special = false
+}
+
+resource "random_password" "k3s_agent_token" {
+  length  = 48
+  upper   = false
+  special = false
+}

kubeconfig.yaml.tftpl

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+apiVersion: v1
+clusters:
+- cluster:
+    certificate-authority-data: ${certificate-authority-data}
+    server: https://${k3s_lb_ip}:6443
+  name: default
+contexts:
+- context:
+    cluster: default
+    user: default
+  name: default
+current-context: default
+kind: Config
+preferences: {}
+users:
+- name: default
+  user:
+    client-certificate-data: ${client-certificate-data}
+    client-key-data: ${client-key-data}

kubeconfig_certs.tf

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+# Create Private Keys and Certificates required by k3s and the Default Kubeconfig
+
+# Generate Server, Client & Request Header CA Keys + Default Client Admin Key
+resource "tls_private_key" "keys" {
+  for_each    = setunion(local.ca_names, local.client_names)
+  algorithm   = "ECDSA" # ECDSA key
+  ecdsa_curve = "P256"  # P256 elliptic curve
+}
+
+# Generate Server, Client & Request Header CA Certificates
+resource "tls_self_signed_cert" "ca_certs" {
+
+  for_each = local.ca_names
+
+  private_key_pem = tls_private_key.keys[each.key].private_key_pem
+
+  subject {
+    common_name = "k3s-${each.key}-ca@${formatdate("YYYYMMDDhhmmss", timestamp())}"
+  }
+
+  is_ca_certificate = true
+
+  validity_period_hours = 87600 # 10 years
+
+  allowed_uses = [
+    "cert_signing",
+    "key_encipherment",
+    "digital_signature",
+  ]
+
+  lifecycle {
+    ignore_changes = [subject]
+  }
+}
+
+# Default Client Admin User Certificate (Signed by Client CA)
+resource "tls_cert_request" "client_admin_user" {
+  private_key_pem = tls_private_key.keys["client-admin"].private_key_pem
+
+  subject {
+    common_name  = "system:admin"
+    organization = "system:masters"
+  }
+}
+
+resource "tls_locally_signed_cert" "client_admin_user" {
+  cert_request_pem   = tls_cert_request.client_admin_user.cert_request_pem
+  ca_private_key_pem = tls_private_key.keys["client"].private_key_pem
+  ca_cert_pem        = tls_self_signed_cert.ca_certs["client"].cert_pem
+
+  validity_period_hours = 8760 # 1 year
+
+  allowed_uses = [
+    "key_encipherment",
+    "digital_signature",
+    "client_auth",
+  ]
+}

kubeconfig_file_output.tf

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+resource "local_file" "k3s_kubeconfig" {
+  content  = local.kubeconfig
+  filename = "${path.root}/k3s.yaml"
+}