如何使用Krew在Kubernetes中安装kubectl插件
时间：2020-02-23 14:31:43 来源:igfitidea点击:
Krew是一个 kubectl用于发现，管理和安装kubectl插件的命令行工具。
它的工作方式类似于yum，brew和apt。
Krew支持超过100个kubectl插件。
对于开发人员，我们可以使用Krew在不同平台上打包和分发插件，并通过集中式存储库将其提供给用户。
在本文中，我们将介绍如何安装和使用Krew为Kubernetes集群安装kubectl插件。
但是首先我们需要安装一个正在运行的Kubernetes集群并安装kubectl。
Krew可以在Windows，Linux和Mac等平台上工作，并支持v1.12及更高版本的kubectl。
我们将介绍在Linux，Mac和Windows上的安装。
安装Krew
在本节中，我们讨论Linux，macOS和Windows系统上的krew安装步骤。
在Linux/Mac上安装Krew
安装Git
## Mac $brew install git ## Debian/Ubuntu $sudo apt install git-all ## RHEL/CentOS $sudo dnf install git-all
2.在终端上使用以下命令安装Krew：
( set -x; cd "$(mktemp -d)" && curl -fsSLO "https://github.com/kubernetes-sigs/krew/releases/latest/download/krew.tar.gz" && tar zxvf krew.tar.gz && KREW=./krew-"$(uname | tr '[:upper:]' '[:lower:]')_$(uname -m | sed -e 's/x86_64/amd64/' -e 's/arm.*$/arm/')" && "$KREW" install krew )
3.成功安装后，我们将看到类似于以下示例的输出：
......
Installing plugin: krew
Installed plugin: krew
\
| Use this plugin:
| kubectl krew
| Documentation:
| https://krew.sigs.k8s.io/
| Caveats:
| \
| | krew is now installed! To start using kubectl plugins, you need to add
| | krew's installation directory to your PATH:
| |
| | * macOS/Linux:
| | - Add the following to your ~/.bashrc or ~/.zshrc:
| | export PATH="${KREW_ROOT:-$HOME/.krew}/bin:$PATH"
| | - Restart your shell.
| |
| | * Windows: Add %USERPROFILE%\.krew\bin to your PATH environment variable
| |
| | To list krew commands and to get help, run:
| | $kubectl krew
| | For a full list of available plugins, run:
| | $kubectl krew search
| |
| | You can find documentation at
| | https://krew.sigs.k8s.io/docs/user-guide/quickstart/.
| /
/
4.包括 $HOME/.krew/bin使用以下命令访问PATH环境：
export PATH="${KREW_ROOT:-$HOME/.krew}/bin:$PATH"
在Windows上安装Krew
从这里安装GitDownload git并安装2.
在此处下载krew.exe并将其安装到目录3.
以管理员身份启动cmd，然后导航到我们下载的krew.exe4目录。
使用以下命令安装krew：
krew install krew
5.包括 %USERPROFILE%\.krew\bin目录到 PATH使用此链接上的方法的环境变量
如何使用Krew
现在我们已经安装了Krew，让我们探索如何使用它。
下面是一些我们将要开始使用Krew的命令。
$kubectl krew update
2.发现可用的Krew插件：
$kubectl krew search NAME DESCRIPTION INSTALLED access-matrix Show an RBAC access matrix for server resources yes advise-psp Suggests PodSecurityPolicies for cluster. no allctx Run commands on contexts in your kubeconfig no apparmor-manager Manage AppArmor profiles for cluster. no auth-proxy Authentication proxy to a pod or service no bd-xray Run Black Duck Image Scans no bulk-action Do bulk actions on Kubernetes resources. no ca-cert Print the PEM CA certificate of the current clu... no capture Triggers a Sysdig capture to troubleshoot the r... no cert-manager Manage cert-manager resources inside your cluster no change-ns View or change the current namespace via kubectl. no cilium Easily interact with Cilium agents. no cluster-group Exec commands across a group of contexts. no config-cleanup Automatically clean up your kubeconfig no config-registry Switch between registered kubeconfigs no creyaml Generate custom resource YAML manifest no ......
3.从Krew安装插件
$kubectl krew install pod-logs Updated the local copy of plugin index. Installing plugin: pod-logs Installed plugin: pod-logs \ | Use this plugin: | kubectl pod-logs | Documentation: | https://github.com/danisla/kubefunc / WARNING: You installed plugin "pod-logs" from the krew-index plugin repository. These plugins are not audited for security by the Krew maintainers. Run them at your own risk.
4.使用我们已安装的插件–我们现在可以使用kubectl执行该插件
$kubectl pod-logs 1) nginx-ingress-1605802027-controller-ch6ct default Running 2) dashboard-metrics-scraper-79c5968bdc-6p4fv kubernetes-dashboard Running 3) kubernetes-dashboard-665f4c5ff-bgrm2 kubernetes-dashboard Running 4) faas-idler-674fd4544c-tz72x openfaas Running 5) gateway-689746ff97-jqrst openfaas Running 6) nats-cdc589ff7-z8zf2 openfaas Running Select a Pod: 1 I1119 16:09:26.542094 6 flags.go:205] Watching for Ingress class: nginx ------------------------------------------------------------------------------ NGINX Ingress controller Release: v0.34.1 Build: v20170715-ingress-nginx-2.11.0-8-gda5fa45e2 Repository: https://github.com/kubernetes/ingress-nginx nginx version: nginx/1.19.1 ------------------------------------------------------------------------------ W1119 16:09:26.544149 6 flags.go:250] SSL certificate chain completion is disabled (--enable-ssl-chain-completion=false) W1119 16:09:26.544237 6 client_config.go:552] Neither --kubeconfig nor --master was specified. Using the inClusterConfig. This might not work. I1119 16:09:26.544553 6 main.go:231] Creating API client for https://10.96.0.1:443 I1119 16:09:26.554426 6 main.go:275] Running in Kubernetes cluster version v1.19 (v1.19.4) - git (clean) commit d360454c9bcd1634cf4cc52d1867af5491dc9c5f - platform linux/amd64 I1119 16:09:26.609756 6 main.go:87] Validated default/nginx-ingress-1605802027-default-backend as the default backend. ....
5.要更新插件，请使用以下命令：
Hyman@theitroad:~# kubectl krew upgrade Updated the local copy of plugin index. Upgrading plugin: access-matrix Skipping plugin access-matrix, it is already on the newest version Upgrading plugin: krew Skipping plugin krew, it is already on the newest version Upgrading plugin: ns Skipping plugin ns, it is already on the newest version Upgrading plugin: pod-logs Skipping plugin pod-logs, it is already on the newest version
6.列出已安装的插件
$kubectl krew list PLUGIN VERSION access-matrix v0.4.5 krew v0.4.0 ns v0.9.1 pod-logs v1.0.1
7.要使用Krew删除插件，请执行以下操作：
$kubectl krew remove pod-logs Uninstalled plugin pod-logs
