centos node

centos/README.md

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+# Lab of Centos Machines
+
+Fetch the latest CentOS Stream 8 cloud image.
+
+```sh
+sudo curl -Lo /var/lib/libvirt/images/centos-stream-8.qcow2 http://cloud.centos.org/centos/8-stream/x86_64/images/CentOS-Stream-GenericCloud-8-20201217.0.x86_64.qcow2
+```
+
+Then, deploy the lab.
+
+```sh
+terraform init
+terraform apply
+```

centos/ansible/prepare.yaml

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+- name: Sample playbook
+  hosts: all
+  become: yes
+  gather_facts: no
+  pre_tasks:
+  - name: Wait for all nodes to become ready
+    wait_for_connection:
+      delay: 5
+      timeout: 60
+  - name: Wait for cloud-init to finish
+    raw: test -f /var/lib/cloud/instance/boot-finished
+    retries: 12
+    delay: 5
+    register: result
+    until: result.rc == 0
+    changed_when: false
+  - name: Gather facts
+    setup:
+  tasks:
+  - ping:

centos/ansible/requirements.yml

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+collections: []
+#- collection1
+#- collection2

centos/centos.tf

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+
+resource "libvirt_cloudinit_disk" "centos_cloudinit" {
+  name           = "centos-cloudinit.iso"
+  user_data      = file("${path.module}/templates/cloud-init.cfg")
+  network_config = file("${path.module}/templates/network-config.cfg")
+  pool           = var.pool_name
+}
+
+resource "libvirt_volume" "centos_disk" {
+  name             = "${format(var.centos_hostname_format, count.index + 1)}.${var.volume_format}"
+  count            = var.centos_machine_count
+  format           = var.volume_format
+  pool             = var.pool_name
+  base_volume_name = "${var.centos_image}.${var.volume_format}"
+}
+
+resource "libvirt_domain" "centos_machine" {
+  count     = var.centos_machine_count
+  name      = format(var.centos_hostname_format, count.index + 1)
+  vcpu      = "1"
+  memory    = "1024"
+  cloudinit = libvirt_cloudinit_disk.centos_cloudinit.id
+  autostart = true
+
+  disk {
+    volume_id = element(libvirt_volume.centos_disk.*.id, count.index)
+  }
+
+  # Makes the tty0 available via `virsh console`
+  console {
+    type        = "pty"
+    target_port = "0"
+  }
+
+  network_interface {
+    network_id = libvirt_network.lab_net.id
+    hostname = format(var.centos_hostname_format, count.index + 1)
+
+    # When creating the domain resource, wait until the network interface gets
+    # a DHCP lease from libvirt, so that the computed IP addresses will be
+    # available when the domain is up and the plan applied.
+    wait_for_lease = true
+  }
+}
+
+locals {
+  centos_machines = { for i in libvirt_domain.centos_machine : i.name => i.network_interface.0.addresses[0] }
+}

centos/main.tf

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+terraform {
+  required_version = ">= 0.13"
+  required_providers {
+    libvirt = {
+      source  = "dmacvicar/libvirt"
+      version = ">=0.6.3"
+    }
+    local = {
+      source  = "hashicorp/local"
+      version = ">=2.0.0"
+    }
+    template = {
+      source  = "hashicorp/template"
+      version = ">=2.2.0"
+    }
+  }
+}
+
+output "machines" {
+  value = local.centos_machines
+}
+
+resource "local_file" "ansible_inventory" {
+  content         = templatefile("${path.module}/templates/inventory", { centos_machines = local.centos_machines, network_domain = var.network_domain })
+  filename        = "ansible/inventory"
+  file_permission = "0644"
+
+  provisioner "local-exec" {
+    working_dir = "${path.module}/ansible"
+    command     = <<EOT
+set -e
+ansible-galaxy install -r requirements.yml
+ansible-playbook -i inventory prepare.yaml -e tf_action=start
+    EOT
+
+  }
+
+  provisioner "local-exec" {
+    working_dir = "${path.module}/ansible"
+    when        = destroy
+    command     = <<EOT
+set -e
+ansible-playbook -i inventory prepare.yaml -e tf_action=stop
+    EOT
+
+  }
+}

centos/network.tf

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+resource "libvirt_network" "lab_net" {
+  name      = var.network_name
+  mode      = "nat"
+  domain    = var.network_domain
+  addresses = [var.network_ip_range]
+  autostart = true
+  dns {
+    enabled = true
+  }
+  dhcp {
+    enabled = true
+  }
+}

centos/provider.tf

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+provider "libvirt" {
+  uri = "qemu:///system"
+}

centos/templates/cloud-init.cfg

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+#cloud-config
+# vim: syntax=yaml
+
+users:
+- name: nicolas
+  gecos: Nicolas MASSE
+  groups: wheel
+  lock_passwd: false
+  # Generate encrypted password with "openssl passwd -6"
+  #passwd: $6$abc...xyz.0
+  ssh_authorized_keys:
+  - ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPR1tt58X0+vbvsCR12gMAqr+g7vjt1Fx/qqz9EiboIs nicolas.masse@itix.fr
+  - ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFW62WJXI1ZCMfNA4w0dMpL0fsldhbEfULNGIUB0nQui nmasse@redhat.com
+
+packages:
+- net-tools
+- hdparm
+- iptraf
+- iotop
+- vim-enhanced
+- tmux
+- rsync
+- tree
+- unzip
+- tar
+- tcpdump
+- telnet
+- strace
+- bind-utils
+
+runcmd:
+# Enable KVM virsh console access
+- [ "systemctl", "enable", "serial-getty@ttyS0.service" ]
+- [ "systemctl", "start", "--no-block", "serial-getty@ttyS0.service" ]
+- [ "sed", "-i.post-install", "-e", "s/PasswordAuthentication yes/PasswordAuthentication no/", "/etc/ssh/sshd_config" ]
+- [ "systemctl", "restart", "sshd" ]
+- [ "sed", "-i.post-install", "-e", "s/^%wheel\tALL=(ALL)\tALL/%wheel  ALL=(ALL)       NOPASSWD: ALL/", "/etc/sudoers" ]

centos/templates/inventory

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+[centos]
+%{for host, ip in centos_machines~}
+${host}.${network_domain} ansible_host=${ip}
+%{endfor~}
+
+[centos:vars]
+ansible_user=nicolas
+ansible_ssh_extra_args='-o StrictHostKeyChecking=no'

centos/templates/network-config.cfg

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+version: 2
+ethernets:
+  eth0:
+    dhcp4: true

centos/variables.tf

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+
+variable "centos_machine_count" {
+  type    = number
+  default = 1
+}
+
+variable "pool_name" {
+  type    = string
+  default = "default"
+}
+
+variable "volume_format" {
+  type    = string
+  default = "qcow2"
+}
+
+variable "centos_hostname_format" {
+  type    = string
+  default = "centos-%02d"
+}
+
+variable "centos_image" {
+  type    = string
+  default = "centos-stream-8"
+}
+
+variable "network_name" {
+  type    = string
+  default = "lab"
+}
+
+variable "network_domain" {
+  type    = string
+  default = "sample.lab"
+}
+
+variable "network_ip_range" {
+  type    = string
+  default = "10.10.0.0/24"
+}