从0开始安装一个本地K8s环境

## 参考kind官网
cat << EOF > ~/tmp/kind-cluster-config.yaml
kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
nodes:
- role: control-plane
  image: kindest/node:v1.27.3
- role: worker
  image: kindest/node:v1.27.3
- role: worker
  image: kindest/node:v1.27.3
- role: worker
  image: kindest/node:v1.27.3
EOF

# kindest/node:v1.27.3 这些镜像的下载可能需要科学上网

在这个文件中，使用了 1.22 的 K8S 镜像。如果不指定这个镜像，默认 Kind 会使用最新的 K8S 版本来部署本地 K8S 集群。

最后安装集群：

shell 复制代码

kind create cluster --config ~/tmp/kind-cluster-config.yaml --name k8s-dev

附注：如果出现如下报错Your kernel does not support cgroup namespaces. Cgroup namespace setting discarded.

，则说明当前内核版本不支持cgroup。需要先升级Linux内核，将内核从3.10升级至5.4。

请参考：https://blog.csdn.net/XiaoWang0777/article/details/140466154

shell 复制代码

## 报错示例
[root@localhost ~]# kind create cluster --config ~/tmp/kind-cluster-config.yaml --name k8s-dev
Creating cluster "k8s-dev" ...
 ✓ Ensuring node image (kindest/node:v1.22.0) 🖼 
 ✗ Preparing nodes 📦 📦 📦 📦  
Deleted nodes: ["k8s-dev-control-plane" "k8s-dev-worker2" "k8s-dev-worker" "k8s-dev-worker3"]
ERROR: failed to create cluster: command "docker run --name k8s-dev-worker3 --hostname k8s-dev-worker3 --label io.x-k8s.kind.role=worker --privileged --security-opt seccomp=unconfined --security-opt apparmor=unconfined --tmpfs /tmp --tmpfs /run --volume /var --volume /lib/modules:/lib/modules:ro -e KIND_EXPERIMENTAL_CONTAINERD_SNAPSHOTTER --detach --tty --label io.x-k8s.kind.cluster=k8s-dev --net kind --restart=on-failure:1 --init=false --cgroupns=private --volume /dev/mapper:/dev/mapper kindest/node:v1.22.0" failed with error: exit status 125
Command Output: WARNING: Your kernel does not support cgroup namespaces.  Cgroup namespace setting discarded.
75cd3d0582e8c5f5ec61e67726ccdb996c36dbc85feffe434659d2f1dec53c0f
docker: Error response from daemon: failed to create task for container: failed to create shim task: OCI runtime create failed: runc create failed: cgroup namespaces aren't enabled in the kernel: unknown.


## 内核升级步骤【yum安装】
# step1：查看内核版本
uname -r
3.10.0-1160.71.1.el7.x86_64

# step2：查看关于内核的包
rpm -qa |grep kernel
kernel-3.10.0-1160.71.1.el7.x86_64
kernel-tools-3.10.0-1160.71.1.el7.x86_64
kernel-headers-3.10.0-1160.119.1.el7.x86_64
kernel-tools-libs-3.10.0-1160.71.1.el7.x86_64

# step3：添加阿里yum源
cat <<EOF > /etc/yum.repos.d/elrepo.repo
> [elrepo]
> name=elrepo
> baseurl=https://mirrors.aliyun.com/elrepo/archive/kernel/el7/x86_64
> gpgcheck=0
> enabled=1
> EOF

# step4：重建yum缓存
yum clean all && yum makecache

# step5：查看yum仓库中的内核包
yum list --showduplicate kernel*

# step6：安装内核【lt 是 long term support的缩写，即内核的长期支持版本】
 yum install -y kernel-lt kernel-lt-devel

# step7：设置启动内核
grub2-set-default 0

# step8：重启生效
[root@localhost ~]# uname -r
3.10.0-1160.71.1.el7.x86_64
[root@localhost ~]# reboot
...
[root@localhost ~]# uname -r
5.4.278-1.el7.elrepo.x86_64

## 内核升级完成之后，重新执行，通过kind工具部署生产一个k8s集群，成功安装示例如下：
[root@localhost ~]# kind create cluster --config ~/tmp/kind-cluster-config.yaml --name k8s-dev
Creating cluster "k8s-dev" ...
 ✓ Ensuring node image (kindest/node:v1.22.0) 🖼
 ✓ Preparing nodes 📦 📦 📦 📦  
 ✓ Writing configuration 📜 
 ✓ Starting control-plane 🕹️ 
 ✓ Installing CNI 🔌 
 ✓ Installing StorageClass 💾 
 ✓ Joining worker nodes 🚜 
Set kubectl context to "kind-k8s-dev"
You can now use your cluster with:

kubectl cluster-info --context kind-k8s-dev

Have a nice day! 👋

5、如何使用k8s集群

从0开始安装k8s1.25: https://blog.csdn.net/qq_41822345/article/details/126679925

一、kind集群操作

shell 复制代码

# 创建k8s集群【使用默认镜像创建】
kind create cluster --name kind-2
# 是用指定的镜像版本创建，比如使用kindest/node:v1.22
kind create cluster --config ~/tmp/kind-cluster-config.yaml --name k8s-dev2
[root@localhost ~]# cat ~/tmp/kind-cluster-config.yaml
kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
nodes:
- role: control-plane
  image: kindest/node:v1.22
- role: worker
  image: kindest/node:v1.22
- role: worker
  image: kindest/node:v1.22
- role: worker
  image: kindest/node:v1.22

# 获取k8s集群
kind get clusters
k8s-dev
k8s-dev2
kind-2

# 查看指定k8s集群【集群名加上kind前缀】
kubectl cluster-info --context kind-k8s-dev
kubectl cluster-info --context kind-k8s-dev2
kubectl cluster-info --context kind-k8s-kind-2


# 删除k8s集群
kind delete cluster --name k8s-dev2

二、kind镜像操作

shell 复制代码

[root@localhost ~]# docker pull nginx:1.14.2
## 将镜像load到k8s集群k8s-dev中
[root@localhost ~]# kind -n k8s-dev load docker-image nginx:1.14.2
Image: "nginx:1.14.2" with ID "sha256:84581e99d807a703c9c03bd1a31cd9621815155ac72a7365fd02311264512656" not yet present on node "k8s-dev-worker", loading...
Image: "nginx:1.14.2" with ID "sha256:84581e99d807a703c9c03bd1a31cd9621815155ac72a7365fd02311264512656" not yet present on node "k8s-dev-control-plane", loading...
Image: "nginx:1.14.2" with ID "sha256:84581e99d807a703c9c03bd1a31cd9621815155ac72a7365fd02311264512656" not yet present on node "k8s-dev-worker2", loading...

# 批量导入镜像到k8s-dev集群中
[root@localhost ~]# xargs kind load docker-image -n k8s-dev < image.manifest
[root@k8s-dev kubeblocks-setups]# cat image.manifest
registry/apecloud/kubeblocks-charts:0.8.0
registry/apecloud/kubeblocks-datascript:0.8.0
registry/apecloud/kubeblocks-dataprotection:0.8.0
registry/apecloud/kubeblocks:0.8.0
registry/apecloud/kubeblocks-tools:0.8.0
registry/kubernetes/sig-storage/csi-snapshotter:v6.2.1


[root@localhost ~]# kubectl apply -f deploy-nginx.yaml
[root@localhost ~]# cat deploy-nginx.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 3 # 告知 Deployment 运行 3 个与该模板匹配的 Pod
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.14.2
        ports:
        - containerPort: 80
# 查看        
[root@localhost ~]# kubectl get pod
NAME                                READY   STATUS    RESTARTS   AGE
nginx-deployment-66b6c48dd5-cb7d7   1/1     Running   0          36s
nginx-deployment-66b6c48dd5-kvzgc   1/1     Running   0          36s
nginx-deployment-66b6c48dd5-qgf6x   1/1     Running   0          36s

6、安装 KubeBlocks

KubeBlocks有两种安装方式，第一种是用kbcli安装，第二种是使用helm安装。

一、kbcli安装

先安装kbcli：https://cn.kubeblocks.io/docs/preview/user-docs/installation/install-with-kbcli/install-kbcli

再安装kubeblocks：https://cn.kubeblocks.io/docs/preview/user-docs/installation/install-with-kbcli/install-kubeblocks-with-kbcli

shell 复制代码

# 默认将 KubeBlocks 安装在 kb-system 命名空间中，可以使用 --namespace 指定一个命名空间
kbcli kubeblocks install
kbcli kubeblocks list-versions
kbcli kubeblocks install --version=0.8.0

# 验证 KubeBlocks 安装
kbcli kubeblocks status

二、helm安装

helm安装的前提，需要先在虚拟机上安装 Helm [10]。KubeBlocks 使用 helm chart 来打包所有要创建在 K8S 集群上面的 K8S API对象。helm 可以从官方文档[3]获取具体的安装方式。

先安装helm安装：https://helm.sh/docs/intro/install

再安装kubeblocks：https://cn.kubeblocks.io/docs/preview/user-docs/installation/install-with-helm/install-kubeblocks-with-helm

shell 复制代码

# 这里使用 --validate=false，是因为 K8S 的某些版本在解析 CRD 有一些字段没有，所以 validate 会失败。为了兼容 K8S 而设置为 false。
kubectl create -f https://github.com/apecloud/kubeblocks/releases/download/v0.8.1/kubeblocks_crds.yaml --validate=false

# 添加 Helm 仓库
helm repo add kubeblocks https://apecloud.github.io/helm-charts
helm repo update

# 安装 KubeBlocks
helm install kubeblocks kubeblocks/kubeblocks --namespace kb-system --create-namespace
# 使用 --version 指定版本安装
helm install kubeblocks kubeblocks/kubeblocks \
--namespace kb-system --create-namespace --version="0.8.0"

# 验证 KubeBlocks 安装
kbcli kubeblocks status

# 验证示例如下
[root@k8s-dev ~]# kbcli kubeblocks status
KubeBlocks is deployed in namespace: kubeblocks-system,version: 0.8.0

Kubernetes Cluster:
VERSION   PROVIDER   REGION   AVAILABLE ZONES   
v1.22.0   Kind                                  

KubeBlocks Workloads:
NAMESPACE           KIND         NAME                           READY PODS   CPU(CORES)   MEMORY(BYTES)   CREATED-AT                   
kubeblocks-system   Deployment   kb-addon-snapshot-controller   1/1          N/A          N/A             Jul 23,2024 23:07 UTC+0800   
kubeblocks-system   Deployment   kubeblocks                     1/1          N/A          N/A             Jul 23,2024 23:07 UTC+0800   
kubeblocks-system   Deployment   kubeblocks-dataprotection      1/1          N/A          N/A             Jul 23,2024 23:07 UTC+0800 
......

官网参考链接：

[1] https://kind.sigs.k8s.io ：Kind 官网

[2] https://kind.sigs.k8s.io/docs/user/quick-start#installing-from-release-binaries ：安装 Kind

[3] https://helm.sh/docs/intro/install ：安装 helm

[4] https://kubeblocks.io/docs/preview/user_docs/installation/install-with-kbcli/install-kbcli ：安装 kbcli

[5] https://docs.docker.com/engine/install ：如何安装 docker

[6] https://go.dev/doc/install ：如何安装 Golang

[7] https://kubernetes.io/docs/tasks/tools/install-kubectl-linux ：如何安装 kubectl

[8] https://minikube.sigs.k8s.io/docs ：Minikube 官网

[9] https://k3d.io/v5.6.0 ：K3D 官网

[10] https://helm.sh ：Helm 官网

[11] https://kubeblocks.io/docs/preview/user_docs/overview/introduction ：KubeBlocks 用户文档首页

[12] https://kubeblocks.io/docs/preview/developer_docs/overview ：KubeBlocks 开发文档首页