Kubernetes installation HowTo

konstest

Jun 28th, 2022

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0. Перед началом установки необходимо выполнить Kubernetes requrements checks https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/#before-you-begin что соответсвующее кол-во CPU/RAM/HDD выделено, а так же соответсвующие типы дисков
1. cat <<EOF | tee /etc/modules-load.d/k8s.conf
overlay
br_netfilter
EOF
sudo modprobe overlay
sudo modprobe br_netfilter
# sysctl params required by setup, params persist across reboots
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
# Apply sysctl params without reboot
$ sudo sysctl --system
2. Install container runtime https://github.com/containerd/containerd/blob/main/docs/getting-started.md
Step 1: Installing containerd
curl https://github.com/containerd/containerd/releases/download/v1.6.6/containerd-1.6.6-linux-amd64.tar.gz | tar Cxzv /usr/local
mkdir -p /usr/local/lib/systemd/system/ && curl https://raw.githubusercontent.com/containerd/containerd/main/containerd.service -O /usr/local/lib/systemd/system/containerd.service
OR using this template of config file:
# Copyright The containerd Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
[Unit]
Description=containerd container runtime
Documentation=https://containerd.io
After=network.target local-fs.target
[Service]
ExecStartPre=-/sbin/modprobe overlay
ExecStart=/usr/local/bin/containerd
Type=notify
Delegate=yes
KillMode=process
Restart=always
RestartSec=5
# Having non-zero Limit*s causes performance problems due to accounting overhead
# in the kernel. We recommend using cgroups to do container-local accounting.
LimitNPROC=infinity
LimitCORE=infinity
LimitNOFILE=infinity
# Comment TasksMax if your systemd version does not supports it.
# Only systemd 226 and above support this version.
TasksMax=infinity
OOMScoreAdjust=-999
[Install]
WantedBy=multi-user.target
Save this systemd config to /usr/local/lib/systemd/system/containerd.service
systemctl daemon-reload
systemctl enable --now containerd
Step 2: Installing runc
curl https://github.com/opencontainers/runc/releases/download/v1.1.3/runc.amd64 -o /usr/local/sbin/runc && chmod 755 /usr/local/sbin/runc
Step 3: Installing CNI plugins
mkdir -p /opt/cni/bin && curl https://github.com/containernetworking/plugins/releases/download/v1.1.1/cni-plugins-linux-amd64-v1.1.1.tgz | tar Cxzv /opt/cni/bin/
Step 4: Configure containerd for Kubernetes https://kubernetes.io/docs/setup/production-environment/container-runtimes/#containerd
On Linux the default CRI socket for containerd is /run/containerd/containerd.sock. On Windows the default CRI endpoint is npipe://./pipe/containerd-containerd.
mkdir /etc/containerd && containerd config default > /etc/containerd/config.toml
sed -i 's/SystemdCgroup = false/SystemdCgroup = true/' /etc/containerd/config.toml
sed -ie 's#sandbox_image = .*#sandbox_image = "k8s.gcr.io/pause:3.7"#' /etc/containerd/config.toml
chmod -R 755 /etc/cni/
sudo systemctl restart containerd
Step 5: configure the cgroup driver for kubelet
https://kubernetes.io/docs/tasks/administer-cluster/kubeadm/configure-cgroup-driver/#configuring-the-kubelet-cgroup-driver
# cat <<EOF | tee kubeadm-config.yaml
kind: ClusterConfiguration
apiVersion: kubeadm.k8s.io/v1beta3
---
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
cgroupDriver: systemd
EOF
3. Installing kubeadm, kubelet and kubectl https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/#installing-kubeadm-kubelet-and-kubectl
4. kubeadm init --config kubeadm-config.yaml
Если у нас выполняется установка на ноде без интернета то предварительно нужно скачать соответствующие docker образы, список которых можно получить на ПК с установленным kubeadm и с доступом в интернет:
$ kubeadm config images list
$ kubeadm config images pull
$ kubeadm config images list
$ ctr -n=k8s.io images list
$ ctr -n=k8s.io image export k8s_images.tar $(ctr -n=k8s.io images list -q | grep -vE sha256 | xargs)
cat <<EOF | tee kube-images-list
k8s.gcr.io/kube-apiserver:v1.24.2
k8s.gcr.io/kube-controller-manager:v1.24.2
k8s.gcr.io/kube-scheduler:v1.24.2
k8s.gcr.io/kube-proxy:v1.24.2
k8s.gcr.io/pause:3.7
k8s.gcr.io/etcd:3.5.3-0
k8s.gcr.io/coredns/coredns:v1.8.6
EOF
cat kube-images-list | while read IMAGE; do docker pull $IMAGE; done
cat kube-images-list | while read IMAGE; do ctr -n=k8s.io images pull $IMAGE; done
ctr -n=k8s.io image export k8s-docker-images.tar $(ctr -n=k8s.io images list -q | grep -vE sha256 | xargs)
# on another host import downloaded images:
ctr -n=k8s.io images import k8s-docker-images.tar
kubeadm init --config kubeadm-config.yaml

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