Helm 3.0介绍
Helm 是一个 Kubernetes 的包管理工具,就像 Linux 下的包管理器,如 yum/apt 等,可以 很方便的将之前打包好的 yaml 文件部署到 kubernetes 上。
Helm 有 3 个重要概念:
(1)helm:一个命令行客户端工具,主要用于 Kubernetes 应用 chart 的创建、打包、发 布和管理。
(2)Chart:应用描述,一系列用于描述 k8s 资源相关文件的yaml集合。
(3)Release:基于 Chart 的部署实体,一个 chart 被 Helm 运行后将会生成对应的一个 release;将在 k8s 中创建出真实运行的资源对象
helm chart —》.kube/config—》kube-apiserver—》资源文件
[root@master ~]# tar xf helm-v3.0.0-linux-amd64.tar.gz
[root@master ~]# ls
helm-v3.0.0-linux-amd64.tar.gz ikube linux-amd64
[root@master ~]# ls linux-amd64/
helm LICENSE README.md
[root@master ~]# mv linux-amd64/helm /usr/bin/
[root@master ~]# helm
The Kubernetes package manager
Common actions for Helm:
- helm search: search for charts
- helm pull: download a chart to your local directory to view
- helm install: upload the chart to Kubernetes
- helm list: list releases of charts
Environment variables:
+------------------+-----------------------------------------------------------------------------+
| Name | Description |
+------------------+-----------------------------------------------------------------------------+
| $XDG_CACHE_HOME | set an alternative location for storing cached files. |
| $XDG_CONFIG_HOME | set an alternative location for storing Helm configuration. |
| $XDG_DATA_HOME | set an alternative location for storing Helm data. |
| $HELM_DRIVER | set the backend storage driver. Values are: configmap, secret, memory |
| $HELM_NO_PLUGINS | disable plugins. Set HELM_NO_PLUGINS=1 to disable plugins. |
| $KUBECONFIG | set an alternative Kubernetes configuration file (default "~/.kube/config") |
+------------------+-----------------------------------------------------------------------------+
Helm stores configuration based on the XDG base directory specification, so
- cached files are stored in $XDG_CACHE_HOME/helm
- configuration is stored in $XDG_CONFIG_HOME/helm
- data is stored in $XDG_DATA_HOME/helm
By default, the default directories depend on the Operating System. The defaults are listed below:
+------------------+---------------------------+--------------------------------+-------------------------+
| Operating System | Cache Path | Configuration Path | Data Path |
+------------------+---------------------------+--------------------------------+-------------------------+
| Linux | $HOME/.cache/helm | $HOME/.config/helm | $HOME/.local/share/helm |
| macOS | $HOME/Library/Caches/helm | $HOME/Library/Preferences/helm | $HOME/Library/helm |
| Windows | %TEMP%\helm | %APPDATA%\helm | %APPDATA%\helm |
+------------------+---------------------------+--------------------------------+-------------------------+
Usage:
helm [command]
Available Commands:
completion Generate autocompletions script for the specified shell (bash or zsh)
create create a new chart with the given name
dependency manage a chart's dependencies
env Helm client environment information
get download extended information of a named release
help Help about any command
history fetch release history
install install a chart
lint examines a chart for possible issues
list list releases
package package a chart directory into a chart archive
plugin install, list, or uninstall Helm plugins
pull download a chart from a repository and (optionally) unpack it in local directory
repo add, list, remove, update, and index chart repositories
rollback roll back a release to a previous revision
search search for a keyword in charts
show show information of a chart
status displays the status of the named release
template locally render templates
test run tests for a release
uninstall uninstall a release
upgrade upgrade a release
verify verify that a chart at the given path has been signed and is valid
version print the client version information
Flags:
--add-dir-header If true, adds the file directory to the header
--alsologtostderr log to standard error as well as files
--debug enable verbose output
-h, --help help for helm
--kube-context string name of the kubeconfig context to use
--kubeconfig string path to the kubeconfig file
--log-backtrace-at traceLocation when logging hits line file:N, emit a stack trace (default :0)
--log-dir string If non-empty, write log files in this directory
--log-file string If non-empty, use this log file
--log-file-max-size uint Defines the maximum size a log file can grow to. Unit is megabytes. If the value is 0, the maximum file size is unlimited. (default 1800)
--logtostderr log to standard error instead of files (default true)
-n, --namespace string namespace scope for this request
--registry-config string path to the registry config file (default "/root/.config/helm/registry.json")
--repository-cache string path to the file containing cached repository indexes (default "/root/.cache/helm/repository")
--repository-config string path to the file containing repository names and URLs (default "/root/.config/helm/repositories.yaml")
--skip-headers If true, avoid header prefixes in the log messages
--skip-log-headers If true, avoid headers when opening log files
--stderrthreshold severity logs at or above this threshold go to stderr (default 2)
-v, --v Level number for the log level verbosity
--vmodule moduleSpec comma-separated list of pattern=N settings for file-filtered logging
Use "helm [command] --help" for more information about a command.
添加存储库
helm repo add stable http://mirror.azure.cn/kubernetes/charts
helm repo add aliyun https://kubernetes.oss-cn-hangzhou.aliyuncs.com/charts
helm repo update
查看配置的存储库
helm repo list
helm search repo stable
删除存储库:
helm repo remove aliyun
helm常用命令
(1)release相关的:
helm create mychart //创建个chart,可以配置里面的信息
helm install chart-test mychart/ //用mychart模板,创建chart-test实例
helm install . 创建一个release实例
helm upgrade [RELEASE] [CHART] [flags] 升级一个版本
helm rollback [flags] [RELEASE] [REVISION] 回滚一个版本
helm delete release 删除创建的release
helm history 查看历史
helm status 获取release的状态信息
(2)chart相关的
helm serach
helm inspect 查看chart的详细信息
helm fetch 把chart下载下来
helm package 把chart打包
(2)release相关的
helm upgrade --set imageTag=1.17 web nginx #更改发布的配置
helm upgrade -f values.yaml web nginx #更改发布的配置
helm rollback test 1 #将应用回滚到第一个版本
helm uninstall test #卸载发行版
helm get all --revision 1 test #查看历史版本配置信息
(3)调试命令,确认信息
helm install chart-test --debug --dry-run mychart/
使用 chart 部署一个应用
查找 chart
[root@master ~]# helm search repo weave
NAME CHART VERSION APP VERSION DESCRIPTION
aliyun/weave-cloud 0.1.2 Weave Cloud is a add-on to...
aliyun/weave-scope 0.9.2 1.6.5 A Helm chart for the Weave ...
stable/weave-cloud 0.3.9 1.4.0 DEPRECATED - Weave Cloud is...
stable/weave-scope 1.1.12 1.12.0 DEPRECATED - A Helm chart ...
[root@master ~]# helm fetch aliyun/weave-scope
查看 chrt 信息
[root@master ~]# helm show chart aliyun/weave-scope
apiVersion: v1
appVersion: 1.6.5
description: A Helm chart for the Weave Scope cluster visualizer.
home: https://www.weave.works/oss/scope/
icon: https://avatars1.githubusercontent.com/u/9976052?s=64
keywords:
- containers
- dashboard
- monitoring
maintainers:
- email: [email protected]
name: omkensey
name: weave-scope
sources:
- https://github.com/weaveworks/scope
version: 0.9.2
安装包
[root@master ~]# helm install my-weave stable/weave-scope
NAME: my-weave
LAST DEPLOYED: Mon May 2 02:55:41 2022
NAMESPACE: default
STATUS: deployed
REVISION: 1
NOTES:
You should now be able to access the Scope frontend in your web browser, by
using kubectl port-forward:
kubectl -n default port-forward $(kubectl -n default get endpoints \
my-weave-weave-scope -o jsonpath='{.subsets[0].addresses[0].targetRef.name}') 8080:4040
then browsing to http://localhost:8080/.
For more details on using Weave Scope, see the Weave Scope documentation:
https://www.weave.works/docs/scope/latest/introducing/
查看发布状态
[root@master ~]# helm list
NAME NAMESPACE REVISION UPDATED STATUS CHART APP VERSION
my-weave default 1 2022-05-02 02:55:41.087638005 -0400 EDT deployed weave-scope-1.1.12 1.12.0
[root@master ~]# helm status my-weave
NAME: my-weave
LAST DEPLOYED: Mon May 2 02:55:41 2022
NAMESPACE: default
STATUS: deployed
REVISION: 1
NOTES:
You should now be able to access the Scope frontend in your web browser, by
using kubectl port-forward:
kubectl -n default port-forward $(kubectl -n default get endpoints \
my-weave-weave-scope -o jsonpath='{.subsets[0].addresses[0].targetRef.name}') 8080:4040
then browsing to http://localhost:8080/.
For more details on using Weave Scope, see the Weave Scope documentation:
https://www.weave.works/docs/scope/latest/introducing/
[root@master ~]# kubectl get all
NAME READY STATUS RESTARTS AGE
pod/weave-scope-agent-my-weave-cqv67 1/1 Running 0 12m
pod/weave-scope-agent-my-weave-pw879 1/1 Running 0 28s
pod/weave-scope-cluster-agent-my-weave-84fd7946c4-7vgwr 1/1 Running 0 12m
pod/weave-scope-frontend-my-weave-767c9cf7f5-78t44 1/1 Running 0 12m
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/kubernetes ClusterIP 10.96.0.1 443/TCP 142d
service/my-weave-weave-scope ClusterIP 10.108.172.101 80/TCP 12m
NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE
daemonset.apps/weave-scope-agent-my-weave 2 2 2 2 2 12m
NAME READY UP-TO-DATE AVAILABLE AGE
deployment.apps/weave-scope-cluster-agent-my-weave 1/1 1 1 12m
deployment.apps/weave-scope-frontend-my-weave 1/1 1 1 12m
NAME DESIRED CURRENT READY AGE
replicaset.apps/weave-scope-cluster-agent-my-weave-84fd7946c4 1 1 1 12m
replicaset.apps/weave-scope-frontend-my-weave-767c9cf7f5 1 1 1 12m
[root@master ~]# kubectl edit service/my-weave-weave-scope
...
type: NodePort
[root@master ~]# kubectl get svc my-weave-weave-scope
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
my-weave-weave-scope NodePort 10.108.172.101 80:30377/TCP 15m