Kubernetes 1.18環境構築実戦(ipvs編)

8453 ワード

Kubergnetes kubernetes1.18 クベルnetes 1.18

kubeadmを使用してKubernetes 1.18単一ノードクラスタを構築する実戦(Oracle Linux 8.1ベース)

詳細手順:

1、IPアドレスを192.168.56.118に変更し、hostsを変更します.

sudo su -

vi /etc/hosts

enp 0 s 8のipとhostnameを追加し、例えば

192.168.56.118 k8s118-master

hostnamectl set-hostname k8s118-master

2,install-k 8 s.shを作成する

export PUBLIC_IP=YOUR_PUBLIC_IP # or DNS_NAME of YOUR_PUBLIC_IP

vi install-public-k8s.sh

#!/bin/bash

echo "Start"

dnf config-manager --set-enabled ol8_u1_baseos_base
dnf config-manager --set-enabled ol8_addons
dnf remove podman -y

export IP_ADDR=$(ip addr show enp0s8 | grep -Po 'inet \K[\d.]+')
echo $IP_ADDR

sudo su - << FOE

# Stop firewall and selinux
sudo systemctl disable --now firewalld
sudo /usr/sbin/setenforce 0
sudo sed -i 's/SELINUX=enforcing/SELINUX=permissive/g' /etc/selinux/config

# Ignore Swap Error while installing kubernetes cluster with Swap
cat< /etc/sysconfig/kubelet
KUBELET_EXTRA_ARGS=--fail-swap-on=false
EOF

# Install neccessary system tools
sudo yum install -y dnf-utils

# Open ipvs
cat </etc/sysconfig/modules/ipvs.modules
modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- nf_conntrack_ipv4
EOF

sudo chmod 755 /etc/sysconfig/modules/ipvs.modules
sudo bash /etc/sysconfig/modules/ipvs.modules
sudo lsmod | grep -e ip_vs -e nf_conntrack_ipv4
sudo dnf install ipset ipvsadm -y

# Config iptables
echo "br_netfilter" > /etc/modules-load.d/br_netfilter.conf
cat< /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF

sudo modprobe br_netfilter
sudo sysctl --system

# Add Docker Repo
sudo dnf config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
# Install Docker-CE
sudo dnf makecache timer
sudo dnf -y install https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm
sudo dnf -y install docker-ce
#sudo dnf -y install --nobest docker-ce
# Enable Docker
sudo systemctl enable --now docker
# Config Docker
if [ ! -d "/etc/docker" ]; then
  mkdir /etc/docker
fi

cat< /etc/docker/daemon.json
{
   "exec-opts": ["native.cgroupdriver=systemd"],
   "log-driver": "json-file",
   "log-opts": {
     "max-size": "100m"
   },
   "storage-driver": "overlay2",
   "storage-opts": [
     "overlay2.override_kernel_check=true"
   ],
   "registry-mirrors": ["https://docker.mirrors.ustc.edu.cn"]
}
EOF

sudo systemctl daemon-reload
sudo systemctl restart docker

# Add Kubernetes Repo
cat < /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

sudo dnf install -y kubeadm kubectl kubelet
sudo systemctl enable kubelet

cat < kubeadm-config.yaml
apiVersion: kubeadm.k8s.io/v1beta2
kind: InitConfiguration
localAPIEndpoint:
  advertiseAddress: $IP_ADDR
  bindPort: 6443
---
apiServer:
  timeoutForControlPlane: 4m0s
  certSANs:
  - ${PUBLIC_IP}
apiVersion: kubeadm.k8s.io/v1beta2
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controllerManager: {}
dns:
  type: CoreDNS
etcd:
  local:
    dataDir: /var/lib/etcd
    serverCertSANs:
    - $PUBLIC_IP
imageRepository: registry.aliyuncs.com/google_containers
kind: ClusterConfiguration
kubernetesVersion: v1.18.0
networking:
  dnsDomain: cluster.local
  serviceSubnet: 10.1.0.0/16
  podSubnet: 10.244.0.0/16
---
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
mode: ipvs
EOF

# Create Kubernetes Cluster
#kubeadm init --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=$IP_ADDR --kubernetes-version stable-1.18 --ignore-preflight-errors=Swap --image-repository registry.aliyuncs.com/google_containers --config kubeadm-config.yaml
kubeadm init --config kubeadm-config.yaml --ignore-preflight-errors=Swap

FOE

sleep 10s

# Add User to docker group
sudo usermod -a -G docker $(id -nu)

# Create .kube folder
if [ -f $HOME/.kube/config ]; then
  rm -rf $HOME/.kube/config
fi

if [ ! -d $HOME/.kube ]; then
  mkdir $HOME/.kube
fi

# Copy Kubernetes config file
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

# Apply network plugin
result=1
while [ $result -ne 0 ]
do
#https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
        curl https://docs.projectcalico.org/v3.10/manifests/calico.yaml -O
        sed -i -e "s?192.168.0.0/16?10.244.0.0/16?g" calico.yaml
        kubectl apply -f calico.yaml
        result=$?
        sleep 20s
done

# Taint master node
kubectl taint nodes --all node-role.kubernetes.io/master-

echo "Complete"

3,install-public-k 8 s.shを実行

chmod +x install-public-k8s.sh
./install-public-k8s.sh

4,nodesを表示する

kubectl get nodes

結果

NAME            STATUS   ROLES    AGE    VERSION
k8s118-master   Ready    master   6m8s   v1.18.0

5、使用したpodsを表示

kubectl get pods -A

結果

NAMESPACE     NAME                                      READY   STATUS    RESTARTS   AGE
kube-system   calico-kube-controllers-dc4469c7f-gqmlg   1/1     Running   0          6m16s
kube-system   calico-node-gqsnq                         1/1     Running   0          6m16s
kube-system   coredns-7ff77c879f-d2zfv                  1/1     Running   0          6m16s
kube-system   coredns-7ff77c879f-fksml                  1/1     Running   0          6m16s
kube-system   etcd-k8s118-master                        1/1     Running   0          6m29s
kube-system   kube-apiserver-k8s118-master              1/1     Running   0          6m29s
kube-system   kube-controller-manager-k8s118-master     1/1     Running   0          6m29s
kube-system   kube-proxy-zt6mf                          1/1     Running   0          6m16s
kube-system   kube-scheduler-k8s118-master              1/1     Running   0          6m29s

6,nginx deploymentを発行し,検証を行う.

パブリッシュ

kubectl create deployment nginx --image=nginx

deploymentsの表示

kubectl get deployments

deploymentsの結果の表示

NAME    READY   UP-TO-DATE   AVAILABLE   AGE
nginx   1/1     1            1           17s

podsの表示

kubectl get pods -o wide

podsの結果の表示

NAME                    READY   STATUS    RESTARTS   AGE   IP             NODE            NOMINATED NODE   READINESS GATES
nginx-f89759699-49zrf   1/1     Running   0          34s   10.244.76.68   k8s118-master

curlでnginxアプリケーションにアクセスする(IPはpodsの結果を表示するIP値)

curl 10.244.0.4

curlの結果




Welcome to nginx!



Welcome to nginx!
If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.

For online documentation and support please refer to
nginx.org.

Commercial support is available at
nginx.com.

Thank you for using nginx.

7,操作の便宜上、~/.bashrcに以下の内容を加える

source

そして実行

source ~/.bashrc

これでkubectlコマンドの代わりにkを使用できます.

おめでとうございます.kubernetes 1.18.0の正常なインストールが完了しました.

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