# Установка K8s

<span style="color: rgb(0, 0, 0);"> </span>

- **[Install kubeadm #1](https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/)**
- **[Install kubeadm #2](https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/)**
- **[Install kubectl](https://kubernetes.io/docs/tasks/tools/install-kubectl-linux/)**

##### <span style="color: rgb(53,152,219);">Настройка Kubernetes кластера kubeadm (4 ВМ, Ubuntu 24.04)</span>

<table id="bkmrk-%D0%A4%D0%B8%D0%B7.-%D1%81%D0%B5%D1%80%D0%B2%D0%B5%D1%80-%D0%92%D0%9C-%D0%A0%D0%BE%D0%BB%D1%8C-"><tbody><tr><td>**Hypervisor**</td><td>**VM/Node**</td><td>**Role**</td><td>**IP**</td></tr><tr><td>**srv-01**</td><td>vm-01</td><td>control-plane</td><td>192.168.1.10</td></tr><tr><td>**srv-01**</td><td>vm-02</td><td>worker</td><td>192.168.1.11</td></tr><tr><td>**srv-02**</td><td>vm-03</td><td>worker</td><td>192.168.1.12</td></tr><tr><td>**srv-02**</td><td>vm-04</td><td>worker</td><td>192.168.1.13</td></tr></tbody></table>

<p class="callout warning">Требуется полная сетевая связность между хостами-гипервизорами.</p>

##### <span style="color: rgb(53,152,219);">Подготовка ОС</span>

**Уникальные hostname / MAC / product\_uuid**

```ruby
sudo hostnamectl set-hostname vm-01       # своё имя на каждой ноде
ip link                                   # проверка MAC
sudo cat /sys/class/dmi/id/product_uuid   # проверка uuid
```

Прописать `/etc/hosts` со всеми 4 IP+именами (или настроить DNS).

**Отключение swap**

```ruby
sudo swapoff -a
sudo sed -i '/ swap / s/^/#/' /etc/fstab
```

**Включение Модулей ядра и sysctl**

```ruby
cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
overlay
br_netfilter
EOF
sudo modprobe overlay
sudo modprobe br_netfilter

cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-iptables  = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.ipv4.ip_forward                 = 1
EOF
sudo sysctl --system
```

<p class="callout info">**Диапазоны открытых портов:**  
**Control-plane:** 6443, 2379-2380, 10250, 10259, 10257  
**Workers:** 10250, 30000-32767  
</p>

##### <span style="color: rgb(53,152,219);">Установка containerd (all nodes)</span>

```ruby
sudo apt-get update
sudo apt-get install -y containerd

sudo mkdir -p /etc/containerd
containerd config default | sudo tee /etc/containerd/config.toml
sudo sed -i 's/SystemdCgroup = false/SystemdCgroup = true/' /etc/containerd/config.toml
sudo systemctl restart containerd
sudo systemctl enable containerd
```

##### <span style="color: rgb(53,152,219);">Установка kubeadm, kubelet, kubectl (</span><span style="color: rgb(53,152,219);">all nodes</span><span style="color: rgb(53,152,219);">)</span>

```ruby
sudo apt-get install -y apt-transport-https ca-certificates curl gpg

curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.34/deb/Release.key | \
  sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg

echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.34/deb/ /' | \
  sudo tee /etc/apt/sources.list.d/kubernetes.list

sudo apt-get update
sudo apt-get install -y kubelet kubeadm kubectl
sudo apt-mark hold kubelet kubeadm kubectl
```

<p class="callout info">Замените `v1.34` на актуальную минорную версию (**[Kubernetes Releases](https://kubernetes.io/releases/)**)</p>

##### <span style="color: rgb(53,152,219);">Инициализация control-plane (vm-01)</span>

```ruby
sudo kubeadm init \
  --apiserver-advertise-address=192.168.1.10 \
  --pod-network-cidr=10.244.0.0/16
```

<p class="callout warning">Сохраните `token`из команды `kubeadm join ...`Повторная генерация: `kubeadm token create --print-join-command`</p>

##### <span style="color: rgb(53,152,219);">Настройка kubectl </span><span style="color: rgb(53,152,219);">(vm-01)</span>

```ruby
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
```

##### <span style="color: rgb(53,152,219);">Сетевой плагин CNI (vm-01)</span>

```ruby
kubectl apply -f https://github.com/flannel-io/flannel/releases/latest/download/kube-flannel.yml
```

`kubectl get nodes` — control-plane должна перейти в `Ready`

##### <span style="color: rgb(53,152,219);">Подключение workers (vm-02, vm-03, vm-04)</span>

```ruby
sudo kubeadm join 192.168.1.10:6443 --token <token> \
  --discovery-token-ca-cert-hash sha256:<hash>
```

##### <span style="color: rgb(53,152,219);">Проверка кластера (vm-01)</span>

```ruby
kubectl get nodes -o wide
kubectl get pods -A
```

<p class="callout success">**Успешный результат**  
All NODEs — `Ready`  
System PODs (coredns, kube-proxy, CNI) — `Running`</p>

Для управления с другой машины скопируйте `~/.kube/config` с `vm-01`

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