centos8搭建单机k8s
2022-05-11 本文已影响0人
孙广宁
一、单机安装k8s
- 配置yum源 /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
- 关闭防火墙
systemctl stop firewalld
systemctl disable firewalld
- 关闭selinux
setenforce 0
- 修改文件/etc/selinux/config
vim /etc/selinux/config
SELINUX=disabled
SELINUXTYPE=targeted
- 禁用swap
swapoff -a
- 修改文件/etc/sysctl.d/k8s.conf
cat > /etc/sysctl.d/k8s.conf <<EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system
- 安装docker
yum -y install yum-utils device-mapper-persistent-data lvm2
yum-config-manager -y --add-repo https://download.docker.com/linux/centos/docker-ce.repo
yum -y install docker-ce-18.06.3.ce-3.el7 docker-ce-cli-18.06.3.ce-3.el7 containerd.io
systemctl start docker
systemctl enable docker
- 安装kubelet
yum -y install kubelet-1.13* kubeadm-1.13* kubectl-1.13*
systemctl start kubelet
systemctl enable kubelet
- 拉取k8s镜像
docker pull mirrorgooglecontainers/kube-apiserver:v1.13.3
docker pull mirrorgooglecontainers/kube-controller-manager:v1.13.3
docker pull mirrorgooglecontainers/kube-scheduler:v1.13.3
docker pull mirrorgooglecontainers/kube-proxy:v1.13.3
docker pull mirrorgooglecontainers/pause:3.1
docker pull mirrorgooglecontainers/etcd:3.2.24
docker pull coredns/coredns:1.2.6
- 重新打tag
docker tag mirrorgooglecontainers/kube-apiserver:v1.13.3 k8s.gcr.io/kube-apiserver:v1.13.3
docker tag mirrorgooglecontainers/kube-controller-manager:v1.13.3 k8s.gcr.io/kube-controller-manager:v1.13.3
docker tag mirrorgooglecontainers/kube-scheduler:v1.13.3 k8s.gcr.io/kube-scheduler:v1.13.3
docker tag mirrorgooglecontainers/kube-proxy:v1.13.3 k8s.gcr.io/kube-proxy:v1.13.3
docker tag mirrorgooglecontainers/pause:3.1 k8s.gcr.io/pause:3.1
docker tag mirrorgooglecontainers/etcd:3.2.24 k8s.gcr.io/etcd:3.2.24
docker tag coredns/coredns:1.2.6 k8s.gcr.io/coredns:1.2.6
- 初始化 k8s
kubeadm init --kubernetes-version=v1.13.3
- 初始化配置
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
kubectl apply -f https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')
- 查看节点状态
[root@apollo-db ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
apollo-db Ready master 2d v1.13.12
- 查看是否创建成功
[root@apollo-db ~]# kubectl get pods --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system coredns-86c58d9df4-5nxv9 1/1 Running 0 2d
kube-system coredns-86c58d9df4-grjwn 1/1 Running 0 2d
kube-system etcd-apollo-db 1/1 Running 0 2d
kube-system kube-apiserver-apollo-db 1/1 Running 0 2d
kube-system kube-controller-manager-apollo-db 1/1 Running 0 2d
kube-system kube-proxy-x9dd8 1/1 Running 0 2d
kube-system kube-scheduler-apollo-db 1/1 Running 0 2d
kube-system weave-net-mpmzq 2/2 Running 2 2d
[root@apollo-db ~]#
- 允许master创建资源
kubectl taint nodes --all node-role.kubernetes.io/master-
二、 helm测试
- 下载并安装helm工具
wget https://storage.googleapis.com/kubernetes-helm/helm-v2.11.0-linux-amd64.tar.gz
tar -zxvf helm-v2.11.0-linux-amd64.tar.gz
cd linux-amd64/
cp helm /usr/local/bin/
- 添加测试的helm repo仓库
helm repo add apphub https://apphub.aliyuncs.com
- 查看helm repo仓库
[root@apollo-db ~]# helm repo list
NAME URL
apphub https://apphub.aliyuncs.com
- 删除和更新helm repo仓库
helm repo remove aliyun
helm repo update
- 安装nginx测试
[root@apollo-db ~]# helm search repo nginx
NAME CHART VERSION APP VERSION DESCRIPTION
apphub/nginx 5.1.5 1.16.1 Chart for the nginx server
apphub/nginx-ingress 1.30.3 0.28.0 An nginx Ingress controller that uses ConfigMap...
apphub/nginx-ingress-controller 5.3.4 0.29.0 Chart for the nginx Ingress controller
apphub/nginx-lego 0.3.1 Chart for nginx-ingress-controller and kube-lego
apphub/nginx-php 1.0.0 nginx-1.10.3_php-7.0 Chart for the nginx php server
- helm安装nginx
[root@apollo-db ~]# helm install appnginx apphub/nginx
NAME: appnginx
LAST DEPLOYED: Wed May 11 22:08:20 2022
NAMESPACE: default
STATUS: deployed
REVISION: 1
TEST SUITE: None
NOTES:
Get the NGINX URL:
NOTE: It may take a few minutes for the LoadBalancer IP to be available.
Watch the status with: 'kubectl get svc --namespace default -w appnginx'
export SERVICE_IP=$(kubectl get svc --namespace default appnginx --template "{{ range (index .status.loadBalancer.ingress 0) }}{{.}}{{ end }}")
echo "NGINX URL: http://$SERVICE_IP/"
[root@apollo-db ~]#
- 查看安装结果
[root@apollo-db ~]# helm list
NAME NAMESPACE REVISION UPDATED STATUS CHART APP VERSION
appnginx default 1 2022-05-11 22:08:20.248320947 +0800 CST deployed nginx-5.1.5 1.16.1
[root@apollo-db ~]#
- 查看pod service deploy
[root@apollo-db ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
appnginx-65cbf4d8d8-c2vqr 1/1 Running 0 66s
[root@apollo-db ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
appnginx LoadBalancer 10.108.252.26 <pending> 80:31380/TCP,443:31180/TCP 69s
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 2d
[root@apollo-db ~]# kubectl get deploy
NAME READY UP-TO-DATE AVAILABLE AGE
appnginx 1/1 1 1 103s
[root@apollo-db ~]#
- 卸载安装
[root@apollo-db ~]# helm uninstall appnginx
release "appnginx" uninstalled
[root@apollo-db ~]#
