homework 12.4: complete task 1: create kubespray inventory example

also create tf config for task 2

src/homework/12-kubernetes/12.4/Makefile

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+tf-init:
+	cd ./terraform \
+	&& env $(cat .env) terraform init
+tf-plan:
+	cd ./terraform \
+	&& env $(cat .env) terraform plan

src/homework/12-kubernetes/12.4/kubespray/inventory.example.ini

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+# ## Configure 'ip' variable to bind kubernetes services on a
+# ## different ip than the default iface
+# ## We should set etcd_member_name for etcd cluster. The node that is not a etcd member do not need to set the value, or can set the empty string value.
+[all]
+control ansible_host=95.54.0.12  # ip=10.3.0.1 etcd_member_name=etcd1
+node1 ansible_host=95.54.0.13  # ip=10.3.0.2 etcd_member_name=etcd2
+node2 ansible_host=95.54.0.14  # ip=10.3.0.3 etcd_member_name=etcd3
+node3 ansible_host=95.54.0.15  # ip=10.3.0.4 etcd_member_name=etcd4
+node4 ansible_host=95.54.0.16  # ip=10.3.0.5 etcd_member_name=etcd5
+
+[kube_control_plane]
+control
+
+[etcd]
+control
+
+[kube_node]
+node1
+node2
+node3
+node4
+
+[calico_rr]
+
+[k8s_cluster:children]
+kube_control_plane
+kube_node
+calico_rr

src/homework/12-kubernetes/12.4/readme.md

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+Выполнение [домашнего задания](https://github.com/netology-code/devkub-homeworks/blob/main/12-kubernetes-04-install-part-2.md)
+по теме "12.4. Развертывание кластера на собственных серверах, лекция 2"
+
+## Q/A
+
+> Новые проекты пошли стабильным потоком. Каждый проект требует себе несколько кластеров: под тесты и продуктив.
+> Делать все руками — не вариант, поэтому стоит автоматизировать подготовку новых кластеров.
+
+### Задание 1
+
+> Подготовить инвентарь kubespray
+> 
+> Новые тестовые кластеры требуют типичных простых настроек. Нужно подготовить инвентарь и проверить его работу. Требования к инвентарю:
+> * подготовка работы кластера из 5 нод: 1 мастер и 4 рабочие ноды;
+> * в качестве CRI — containerd;
+> * запуск etcd производить на мастере.
+
+Пример inventory-файла для запуска `kubespray`: [`inventory.example.ini`](./kubespray/inventory.example.ini).
+В данной конфигурации необходимо только изменить ip-адреса виртуальных машин.
+
+### Задание 2
+
+> Подготовить и проверить инвентарь для кластера в yandex.cloud
+> 
+> Часть новых проектов хотят запускать на мощностях yandex.cloud. Требования похожи:
+> * разворачивать 5 нод: 1 мастер и 4 рабочие ноды;
+> * работать должны на минимально допустимых виртуальных машинах 
+
+// todo

src/homework/12-kubernetes/12.4/terraform/.env.example

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+YC_TOKEN=OAuthToken
+YC_CLOUD_ID=cloudId
+YC_FOLDER_ID=folderId
+YC_ZONE=ru-central1-a

src/homework/12-kubernetes/12.4/terraform/.gitignore

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+.env
+
+# Local .terraform directories
+**/.terraform/*
+
+# .tfstate files
+*.tfstate
+*.tfstate.*
+
+# Crash log files
+crash.log
+crash.*.log
+
+# Exclude all .tfvars files, which are likely to contain sentitive data, such as
+# password, private keys, and other secrets. These should not be part of version
+# control as they are data points which are potentially sensitive and subject
+# to change depending on the environment.
+#
+*.tfvars
+
+# Ignore override files as they are usually used to override resources locally and so
+# are not checked in
+override.tf
+override.tf.json
+*_override.tf
+*_override.tf.json
+
+# Include override files you do wish to add to version control using negated pattern
+#
+# !example_override.tf
+
+# Include tfplan files to ignore the plan output of command: terraform plan -out=tfplan
+# example: *tfplan*
+
+# Ignore CLI configuration files
+.terraformrc
+terraform.rc

src/homework/12-kubernetes/12.4/terraform/.terraform.lock.hcl

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+# This file is maintained automatically by "terraform init".
+# Manual edits may be lost in future updates.
+
+provider "registry.terraform.io/yandex-cloud/yandex" {
+  version = "0.82.0"
+  hashes = [
+    "h1:TV2paiynRTtVYsUbOgsHR+g6GVbCnXTgvrb4JDmNVzs=",
+  ]
+}

src/homework/12-kubernetes/12.4/terraform/main.tf

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+terraform {
+  required_providers {
+    yandex = {
+      source = "yandex-cloud/yandex"
+    }
+  }
+  required_version = ">= 0.13"
+}
+
+provider "yandex" {
+  token     = "auth_token_here"
+  cloud_id  = "cloud_id_here"
+  folder_id = "folder_id_here"
+  zone      = "ru-central1-a"
+}
+
+resource "yandex_vpc_network" "network-1" {
+  name = "network1"
+}
+
+resource "yandex_vpc_subnet" "subnet-1" {
+  name           = "subnet1"
+  zone           = "ru-central1-a"
+  network_id     = yandex_vpc_network.network-1.id
+  v4_cidr_blocks = ["192.168.10.0/24"]
+}
+
+resource "yandex_compute_instance" "k8s-control" {
+  name = "test-vm-1"
+
+  resources {
+    cores  = 2
+    memory = 2
+  }
+
+  boot_disk {
+    initialize_params {
+      image_id = "fd81hgrcv6lsnkremf32" # ubuntu-20-04-lts-v20210908
+    }
+  }
+
+  network_interface {
+    subnet_id = yandex_vpc_subnet.subnet-1.id
+    nat       = true
+  }
+
+  metadata = {
+    ssh-keys = "ubuntu:${file("~/.ssh/id_rsa.pub")}"
+  }
+}
+
+resource "yandex_compute_instance" "k8s-node" {
+  for_each = toset(["node01", "node02", "node03", "node04"])
+
+  name = each.key
+
+  resources {
+    cores  = 1
+    memory = 1
+  }
+
+  boot_disk {
+    initialize_params {
+      image_id = "fd81hgrcv6lsnkremf32" # ubuntu-20-04-lts-v20210908
+    }
+  }
+
+  network_interface {
+    subnet_id = yandex_vpc_subnet.subnet-1.id
+    nat       = true
+  }
+
+  metadata = {
+    ssh-keys = "ubuntu:${file("~/.ssh/id_rsa.pub")}"
+  }
+}
+
+output "control_ips" {
+  value = {
+    external = yandex_compute_instance.k8s-control.network_interface.0.ip_address
+    internal = yandex_compute_instance.k8s-control.network_interface.0.nat_ip_address
+  }
+}
+
+output "node_ips" {
+  value = {
+    external = values(yandex_compute_instance.k8s-node)[*].network_interface.0.ip_address
+    internal = values(yandex_compute_instance.k8s-node)[*].network_interface.0.nat_ip_address
+  }
+}