K8s - Install Minikube in Linux

1 - minikube

Minikube is a tool that makes it easy to run Kubernetes locally.
Minikube runs a single-node Kubernetes cluster inside a Virtual Machine (VM) on your laptop for users looking to try out Kubernetes or develop with it day-to-day.
Minikube 是一个易于在本地运行 Kubernetes 的工具，
可在笔记本电脑上的虚拟机内轻松创建单机版 Kubernetes 集群，便于尝试 Kubernetes 或使用 Kubernetes 日常开发。

kubernetes.io

Hello Minikube

注意：

  • Minikube是由Kubernetes开源社区开发，专为本地部署而设计的一个版本，但Minikube只能局限于包含一个节点的本地集群，因此对于生产级别的多节点Kubernetes集群来说，很难在本地进行模拟测试。。
  • 从1.5.0版本开始，Minikube缺省使用本地最好的驱动来创建Kubernetes本地环境，因此需先确保安装了类似VirtualBox、Hyper-V、KVM、Docker等。

2 - 环境准备

虚拟机中已安装docker

[anliven@anliven ~]$ uname -a
Linux anliven 3.10.0-1127.el7.x86_64 #1 SMP Tue Mar 31 23:36:51 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
[anliven@anliven ~]$
[anliven@anliven ~]$ cat /etc/system-release
CentOS Linux release 7.8.2003 (Core)
[anliven@anliven ~]$
[anliven@anliven ~]$ docker version
Client: Docker Engine - Community
 Version:           19.03.11
 API version:       1.40
 Go version:        go1.13.10
 Git commit:        42e35e61f3
 Built:             Mon Jun  1 09:13:48 2020
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          19.03.11
  API version:      1.40 (minimum version 1.12)
  Go version:       go1.13.10
  Git commit:       42e35e61f3
  Built:            Mon Jun  1 09:12:26 2020
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.2.13
  GitCommit:        7ad184331fa3e55e52b890ea95e65ba581ae3429
 runc:
  Version:          1.0.0-rc10
  GitCommit:        dc9208a3303feef5b3839f4323d9beb36df0a9dd
 docker-init:
  Version:          0.18.0
  GitCommit:        fec3683
[anliven@anliven ~]$

3 - 用户权限设置

[root@anliven ~]# visudo
[root@anliven ~]# 
[root@anliven ~]# cat /etc/sudoers |grep anliven
anliven    ALL=(ALL)        NOPASSWD: ALL
[root@anliven ~]#
[root@anliven ~]# exit
[anliven@anliven ~]# sudo usermod -aG docker $USER && newgrp docker

4 - 安装kubectl

使用 kubectl 与集群进行交互。
kubectl是Kubernetes命令行工具，可以部署和管理应用， 查看各种资源， 创建、 删除和更新各种组件。

命令

curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl
chmod +x kubectl
sudo mv ./kubectl /usr/local/bin/kubectl
kubectl version --client

示例

[anliven@anliven K8s]$ pwd
/home/anliven/K8s
[anliven@anliven K8s]$
[anliven@anliven K8s]$ curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 41.0M  100 41.0M    0     0  2819k      0  0:00:14  0:00:14 --:--:-- 2832k
[anliven@anliven K8s]$
[anliven@anliven K8s]$ chmod +x kubectl
[anliven@anliven K8s]$
[anliven@anliven K8s]$ sudo mv ./kubectl /usr/local/bin/kubectl
[anliven@anliven K8s]$
[anliven@anliven K8s]$ ls -l /usr/local/bin/kubectl
-rwxrwxr-x 1 anliven anliven 43003904 Oct 14 22:43 /usr/local/bin/kubectl
[anliven@anliven K8s]$
[anliven@anliven K8s]$ kubectl version --client
Client Version: version.Info{Major:"1", Minor:"19", GitVersion:"v1.19.3", GitCommit:"1e11e4a2108024935ecfcb2912226cedeafd99df", GitTreeState:"clean", BuildDate:"2020-10-14T12:50:19Z", GoVersion:"go1.15.2", Compiler:"gc", Platform:"linux/amd64"}
[anliven@anliven K8s]$

kubectl命令帮助

kubectl -h    # 查看子命令列表
kubectl options    # 查看全局选项


Use "kubectl <command> --help" for more information about a given command.
kubectl <command> --help    # 查看子命令的帮助

Use "kubectl options" for a list of global command-line options (applies to all commands).
kubectl [command] [PARAMS] -o=<format>    # 设置输出格式（如 json、yaml、jsonpath 等）


kubectl explain RESOURCE [options]    # 查看资源的定义
kubectl explain -h

kubectl get [flags] [options]    # 显示一个或多个资源
kubectl get -h

5 - 安装minikube

命令

curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64
sudo install minikube-linux-amd64 /usr/local/bin/minikube
minikube version

示例

[anliven@anliven K8s]$ curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 56.0M  100 56.0M    0     0  2510k      0  0:00:22  0:00:22 --:--:-- 2234k
[anliven@anliven K8s]$
[anliven@anliven K8s]$ sudo install minikube-linux-amd64 /usr/local/bin/minikube
[anliven@anliven K8s]$
[anliven@anliven K8s]$ ls -l /usr/local/bin/minikube
-rwxr-xr-x 1 root root 58733392 Oct 14 22:46 /usr/local/bin/minikube
[anliven@anliven K8s]$
[anliven@anliven K8s]$ minikube version
minikube version: v1.14.0
commit: b09ee50ec047410326a85435f4d99026f9c4f5c4

6 - 从github下载并安装kubectl和minikube

如果无法访问google站点，也可以从github下载并安装kubectl和minikube。

kubectl

  1. 访问 https://github.com/kubernetes/kubernetes/releases
  2. 点击类似CHANGELOG-*.*.md的链接，在“Client Binaries”区域找到匹配的二进制包，
  3. 下载并解压，然后放入/usr/local/bin目录

minikube

找到匹配的二进制包并下载： https://github.com/kubernetes/minikube/releases/

curl -Lo minikube https://github.com/kubernetes/minikube/releases/download/v1.14.0/minikube-linux-arm64
chmod +x minikube
sudo mv minikube /usr/local/bin

也可以使用阿里云的minikube地址： https://github.com/AliyunContainerService/minikube

curl -Lo minikube https://kubernetes.oss-cn-hangzhou.aliyuncs.com/minikube/releases/v1.13.0/minikube-linux-amd64
chmod +x minikube
sudo mv minikube /usr/local/bin/

7 - 启动与运行minikube

示例

[anliven@anliven ~]$ minikube start
* minikube v1.14.0 on Centos 7.8.2003 (vbox/amd64)
* Automatically selected the docker driver    # 本例中自动选择了docker驱动来创建Kubernetes本地环境
* Starting control plane node minikube in cluster minikube
* Pulling base image ...        # 第一次会拉取基础镜像，用时较久
* Creating docker container (CPUs=2, Memory=2200MB) ...
* Preparing Kubernetes v1.19.2 on Docker 19.03.8 ...
    > kubelet.sha256: 65 B / 65 B [--------------------------] 100.00% ? p/s 0s
    > kubeadm.sha256: 65 B / 65 B [--------------------------] 100.00% ? p/s 0s
    > kubectl.sha256: 65 B / 65 B [--------------------------] 100.00% ? p/s 0s
    > kubeadm: 37.30 MiB / 37.30 MiB [-------------] 100.00% 822.08 KiB p/s 47s
    > kubectl: 41.01 MiB / 41.01 MiB [-------------] 100.00% 881.98 KiB p/s 48s
    > kubelet: 104.88 MiB / 104.88 MiB [------------] 100.00% 1.58 MiB p/s 1m6s
* Verifying Kubernetes components...
* Enabled addons: storage-provisioner, default-storageclass
* Done! kubectl is now configured to use "minikube" by default
[anliven@anliven ~]$
[anliven@anliven ~]$ docker images |grep k8s
gcr.io/k8s-minikube/kicbase                                         v0.0.13             90f1294ff9ac        2 weeks ago         800MB
[anliven@anliven ~]$
[anliven@anliven ~]$ docker ps
CONTAINER ID        IMAGE                                 COMMAND                  CREATED             STATUS              PORTS                                                                                                      NAMES
5d520392622e        gcr.io/k8s-minikube/kicbase:v0.0.13   "/usr/local/bin/entr…"   4 hours ago         Up 4 hours          127.0.0.1:32775->22/tcp, 127.0.0.1:32774->2376/tcp, 127.0.0.1:32773->5000/tcp, 127.0.0.1:32772->8443/tcp   minikube
[anliven@anliven ~]$
[anliven@anliven ~]$ minikube ip  # 获取minikube的ip地址
192.168.49.2
[anliven@anliven ~]$

可以根据需要配置启动参数，例如minikube start --cpus=2 --memory=2048 -- --kubernetes-version=v1.19.3

--driver    从1.5.0版本开始，Minikube缺省使用本地最好的驱动来创建Kubernetes本地环境
--image-mirror-country cn    将缺省利用 registry.cn-hangzhou.aliyuncs.com/google_containers 作为安装Kubernetes的容器镜像仓库
--iso-url    指定镜像地址下载相应的 .iso 文件
--registry-mirror    为了拉取Docker Hub镜像，需要为 Docker daemon 配置镜像加速
--cpus=2    为minikube虚拟机分配CPU核数
--memory=2048mb    为minikube虚拟机分配内存数
--kubernetes-version    minikube 虚拟机将使用的 kubernetes 版本

此时，使用kubectl get nodes检查集群所包含节点的命令可以返回minikube的主机名和状态。

[anliven@anliven ~]$ kubectl get nodes
NAME       STATUS   ROLES    AGE    VERSION
minikube   Ready    master   130d   v1.19.2

通过minikube start命令可以重启现有的minikube

[anliven@anliven ~]$ minikube start
* minikube v1.14.0 on Centos 7.8.2003 (vbox/amd64)
* Using the docker driver based on existing profile
* Starting control plane node minikube in cluster minikube
* Restarting existing docker container for "minikube" ...    # 重启现有的minikube
* Preparing Kubernetes v1.19.2 on Docker 19.03.8 ...
* Verifying Kubernetes components...
* Enabled addons: default-storageclass, storage-provisioner
* Done! kubectl is now configured to use "minikube" by default
[anliven@anliven ~]$

如果minikube突然出现不稳定的状况，可以使用minikube stop和minikube delete命令删除当前的minikube，然后通过 minikube start命令重新安装。

一个部署示例：

[anliven@anliven ~]$ kubectl get all -A  # 查看所有的资源
NAMESPACE     NAME                                   READY   STATUS    RESTARTS   AGE
kube-system   pod/coredns-f9fd979d6-qjj7q            1/1     Running   0          4m
kube-system   pod/etcd-minikube                      1/1     Running   0          4m2s
kube-system   pod/kube-apiserver-minikube            1/1     Running   0          4m2s
kube-system   pod/kube-controller-manager-minikube   1/1     Running   0          4m1s
kube-system   pod/kube-proxy-ldbqb                   1/1     Running   0          4m
kube-system   pod/kube-scheduler-minikube            1/1     Running   0          4m1s
kube-system   pod/storage-provisioner                1/1     Running   0          3m58s

NAMESPACE     NAME                 TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)                  AGE
default       service/kubernetes   ClusterIP   10.96.0.1    <none>        443/TCP                  4m8s
kube-system   service/kube-dns     ClusterIP   10.96.0.10   <none>        53/UDP,53/TCP,9153/TCP   4m5s

NAMESPACE     NAME                        DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR            AGE
kube-system   daemonset.apps/kube-proxy   1         1         1       1            1           kubernetes.io/os=linux   4m5s

NAMESPACE     NAME                      READY   UP-TO-DATE   AVAILABLE   AGE
kube-system   deployment.apps/coredns   1/1     1            1           4m5s

NAMESPACE     NAME                                DESIRED   CURRENT   READY   AGE
kube-system   replicaset.apps/coredns-f9fd979d6   1         1         1       4m
[anliven@anliven ~]$
[anliven@anliven ~]$ kubectl get all
NAME                 TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE
service/kubernetes   ClusterIP   10.96.0.1    <none>        443/TCP   4m12s
[anliven@anliven ~]$
[anliven@anliven ~]$ docker images|grep nginx  # 查看镜像
nginx                                                               latest              7e4d58f0e5f3        5 months ago        133MB
[anliven@anliven ~]$
[anliven@anliven ~]$ kubectl create deployment nginx --image=nginx:latest  # 部署应用
deployment.apps/nginx created
[anliven@anliven ~]$
[anliven@anliven ~]$ kubectl get all
NAME                         READY   STATUS              RESTARTS   AGE
pod/nginx-55649fd747-lg4d6   0/1     ContainerCreating   0          17s

NAME                 TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE
service/kubernetes   ClusterIP   10.96.0.1    <none>        443/TCP   4m51s

NAME                    READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/nginx   0/1     1            0           17s

NAME                               DESIRED   CURRENT   READY   AGE
replicaset.apps/nginx-55649fd747   1         1         0       17s
[anliven@anliven ~]$
[anliven@anliven ~]$ kubectl expose deployment nginx --type=NodePort --port=8888  # 暴露8080端口，类型为NodePort（在每个Node上分配一个端口作为外部访问入口）
service/nginx exposed
[anliven@anliven ~]$
[anliven@anliven ~]$ kubectl get all
NAME                         READY   STATUS    RESTARTS   AGE
pod/nginx-55649fd747-lg4d6   1/1     Running   0          9m26s

NAME                 TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)          AGE
service/kubernetes   ClusterIP   10.96.0.1      <none>        443/TCP          10m
service/nginx        NodePort    10.102.183.1   <none>        8888:31765/TCP   8m33s

NAME                    READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/nginx   1/1     1            1           9m26s

NAME                               DESIRED   CURRENT   READY   AGE
replicaset.apps/nginx-55649fd747   1         1         1       9m26s
[anliven@anliven ~]$

8 - Minikube 命令

命令帮助

Use "minikube <command> --help" for more information about a given command.
Use "minikube options" for a list of global command-line options (applies to all commands).

命令选项

[anliven@anliven ~]$ minikube options
The following options can be passed to any command:

      --alsologtostderr=false: log to standard error as well as files
  -b, --bootstrapper='kubeadm': The name of the cluster bootstrapper that will set up the Kubernetes cluster.
      --log_backtrace_at=:0: when logging hits line file:N, emit a stack trace
      --log_dir='': If non-empty, write log files in this directory
      --logtostderr=false: log to standard error instead of files
  -p, --profile='minikube': The name of the minikube VM being used. This can be set to allow having multiple instances of minikube independently.
      --stderrthreshold=2: logs at or above this threshold go to stderr
  -v, --v=0: log level for V logs
      --vmodule=: comma-separated list of pattern=N settings for file-filtered logging
[anliven@anliven ~]$

一些命令

Minikube 集群

minikube version    # 查看版本

minikube status    # 查看状态
minikube profile list  # 查看属性
minikube addons list    # 查看当前支持的插件
minikube service list   # 查看服务列表
minikube node list    # 参看添加的node

minikube ssh    # 登录
minikube ip     # 获取IP地址

minikube start    # 启动
minikube stop    # 停止
minikube delete    # 删除

minikube dashboard    # 在默认浏览器中启动仪表盘

rm-rf ~/.minikube    #  重置(清理所有缓存的镜像，重头开始)

一些示例

[anliven@anliven ~]$ minikube status    # 查看集群状态
minikube
type: Control Plane
host: Running
kubelet: Running
apiserver: Running
kubeconfig: Configured

[anliven@anliven ~]$
[anliven@anliven ~]$ minikube profile list    # 查看集群属性
|----------|-----------|---------|--------------|------|---------|---------|
| Profile  | VM Driver | Runtime |      IP      | Port | Version | Status  |
|----------|-----------|---------|--------------|------|---------|---------|
| minikube | docker    | docker  | 192.168.49.2 | 8443 | v1.19.2 | Running |
|----------|-----------|---------|--------------|------|---------|---------|
[anliven@anliven ~]$
[anliven@anliven ~]$ minikube addons list    # 查看集群当前支持的插件
|-----------------------------|----------|--------------|
|         ADDON NAME          | PROFILE  |    STATUS    |
|-----------------------------|----------|--------------|
| ambassador                  | minikube | disabled     |
| csi-hostpath-driver         | minikube | disabled     |
| dashboard                   | minikube | enabled ✅   |
| default-storageclass        | minikube | enabled ✅   |
| efk                         | minikube | disabled     |
| freshpod                    | minikube | disabled     |
| gcp-auth                    | minikube | disabled     |
| gvisor                      | minikube | disabled     |
| helm-tiller                 | minikube | disabled     |
| ingress                     | minikube | disabled     |
| ingress-dns                 | minikube | disabled     |
| istio                       | minikube | disabled     |
| istio-provisioner           | minikube | disabled     |
| kubevirt                    | minikube | disabled     |
| logviewer                   | minikube | disabled     |
| metallb                     | minikube | disabled     |
| metrics-server              | minikube | disabled     |
| nvidia-driver-installer     | minikube | disabled     |
| nvidia-gpu-device-plugin    | minikube | disabled     |
| olm                         | minikube | disabled     |
| pod-security-policy         | minikube | disabled     |
| registry                    | minikube | disabled     |
| registry-aliases            | minikube | disabled     |
| registry-creds              | minikube | disabled     |
| storage-provisioner         | minikube | enabled ✅   |
| storage-provisioner-gluster | minikube | disabled     |
| volumesnapshots             | minikube | disabled     |
|-----------------------------|----------|--------------|
[anliven@anliven ~]$
[anliven@anliven ~]$ minikube service list    # 查看集群服务列表
|----------------------|---------------------------|--------------|-----|
|      NAMESPACE       |           NAME            | TARGET PORT  | URL |
|----------------------|---------------------------|--------------|-----|
| default              | kubernetes                | No node port |
| kube-system          | kube-dns                  | No node port |
| kubernetes-dashboard | dashboard-metrics-scraper | No node port |
| kubernetes-dashboard | kubernetes-dashboard      | No node port |
|----------------------|---------------------------|--------------|-----|
[anliven@anliven ~]$
[anliven@anliven ~]$ minikube node list    # node列表
minikube        192.168.49.2
[anliven@anliven ~]$
[anliven@anliven ~]$ minikube ip    # ip地址
192.168.49.2
[anliven@anliven ~]$
[anliven@anliven ~]$ minikube ssh    # 登录
docker@minikube:~$ whoami
docker
docker@minikube:~$ exit
logout
[anliven@anliven ~]$
[anliven@anliven ~]$ minikube stop    # 停止
* Stopping node "minikube"  ...
* Powering off "minikube" via SSH ...
* 1 nodes stopped.
[anliven@anliven ~]$
[anliven@anliven ~]$ minikube status    # 查看状态
minikube
type: Control Plane
host: Stopped
kubelet: Stopped
apiserver: Stopped
kubeconfig: Stopped

[anliven@anliven ~]$
[anliven@anliven ~]$ minikube start        # 重新启动，不会“Pulling base image ...”
* minikube v1.14.0 on Centos 7.8.2003 (vbox/amd64)
* Using the docker driver based on existing profile
* Starting control plane node minikube in cluster minikube
* Restarting existing docker container for "minikube" ...
* Preparing Kubernetes v1.19.2 on Docker 19.03.8 ...
* Verifying Kubernetes components...
* Enabled addons: default-storageclass, storage-provisioner, dashboard
* Done! kubectl is now configured to use "minikube" by default
[anliven@anliven ~]$
[anliven@anliven ~]$ minikube status    # 查看状态
minikube
type: Control Plane
host: Running
kubelet: Running
apiserver: Running
kubeconfig: Configured

[anliven@anliven ~]$

启动Dashboard
minikube dashboard # 在默认浏览器中启动仪表盘

9 - 问题处理

1 - minikube启动失败

[root@anliven K8s]# minikube start
* minikube v1.14.0 on Centos 7.8.2003 (vbox/amd64)
* Automatically selected the docker driver
* The "docker" driver should not be used with root privileges.
* If you are running minikube within a VM, consider using --driver=none:
*   https://minikube.sigs.k8s.io/docs/reference/drivers/none/

X Exiting due to DRV_AS_ROOT: The "docker" driver should not be used with root privileges.

处理方法： 使用非root用户，并将此用户添加到docker组： sudo usermod -aG docker $USER && newgrp docker

2 - dashboard启动失败

[anliven@anliven ~]$ minikube dashboard
* Enabling dashboard ...
* Verifying dashboard health ...
* Launching proxy ...
* Verifying proxy health ...
* Opening http://127.0.0.1:37006/api/v1/namespaces/kubernetes-dashboard/services/http:kubernetes-dashboard:/proxy/ in your default browser...
START /usr/bin/firefox "http://127.0.0.1:37006/api/v1/namespaces/kubernetes-dashboard/services/http:kubernetes-dashboard:/proxy/"
Failed to open connection to "session" message bus: Unable to autolaunch a dbus-daemon without a $DISPLAY for X11
Running without a11y support!
Error: no DISPLAY environment variable specified
xdg-open: no method available for opening 'http://127.0.0.1:37006/api/v1/namespaces/kubernetes-dashboard/services/http:kubernetes-dashboard:/proxy/'

X Exiting due to HOST_BROWSER: failed to open browser: exit status 3

[anliven@anliven ~]$

处理方法： 需要图形界面下的命令行中执行minikube dashboard，以便启动浏览器

10 - 参考信息

posted @ 2020-10-20 00:29  Anliven  阅读(1564)  评论(0)  编辑  收藏  举报