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關(guān)于K8s使用Helm部署應(yīng)用Demo、私有Heml源搭建Demo的一些筆記

寫在前面
學(xué)習(xí)K8s涉及，整理筆記記憶
博文偏實(shí)戰(zhàn)，內(nèi)容涉及：
Helm的基本概念及安裝，Helm源配置
chart包的安裝部署
私有Helm源的搭建及chart包的push和pull
「 “不愛也不恨”包含了全部世俗智慧的一半；“不要說話也不要相信”則包含了另一半的人生智慧?！灞救A《人生的智慧》」

Helm
Helm是一個(gè)由CNCF孵化和管理的項(xiàng)目,用于對(duì)需要在Kubernetes上部署的復(fù)雜應(yīng)用進(jìn)行定義、安裝和更新。Helm以Chart的方式對(duì)應(yīng)用軟件進(jìn)行描述,可以方便地創(chuàng)建、版本化、共享和發(fā)布復(fù)雜的應(yīng)用軟件。

「helm的作用就是把許多的資源定義比如svc，deployment，一次性通過全部定義好，放在源里統(tǒng)一管理，這樣很容易在其他機(jī)器上部署，個(gè)人理解這個(gè)類似于自動(dòng)化運(yùn)維中ansible中的角色概念，前端項(xiàng)目中的npm包管理工具,后端項(xiàng)目中的maven等構(gòu)建工具一樣，類比Ansible使用角色來整合playbook.yaml達(dá)到復(fù)用性。同樣的，使用helm用于整合k8s中的資源對(duì)象yaml文件，實(shí)現(xiàn)復(fù)用性,同時(shí)講資源文件的參數(shù)，和參數(shù)值通過temple和value進(jìn)行了分離」

Helm主要概念
「Chart」:一個(gè)Helm包,其中包含運(yùn)行一個(gè)應(yīng)用所需要的工具和資源定義,還可能包含Kubernetes集群中的服務(wù)定義,類似Ansible中的rhel-system-roles軟件包或者ansible-galaxy工具：

「Release」: 在Kubernetes集群上運(yùn)行的一個(gè)Chart實(shí)例。在同一個(gè)集群上,一個(gè)Chart可以被安裝多次。

「Repository」:用于存放和共享Chart倉庫。**簡(jiǎn)單來說, Helm整個(gè)系統(tǒng)的主要任務(wù)就是,在倉庫中查找需要的Chart,然后將Chart以Release的形式安裝到Kubernetes集群中。**

「使用helm我們首先需要安裝，可以通過Github下載安裝包」

Helm 安裝
「安裝包下載:https://github.com/helm/helm/releases」:

「解壓安裝」

┌──[root@vms81.liruilongs.github.io]-[~]
└─$tar zxf helm-v3.2.1-linux-amd64.tar.gz
┌──[root@vms81.liruilongs.github.io]-[~]
└─$cd linux-amd64/
┌──[root@vms81.liruilongs.github.io]-[~/linux-amd64]
└─$ls
helm LICENSE README.md
「之后直接將helm復(fù)制到/usr/local/bin/，配置完之后，即可以使用helm命令」

┌──[root@vms81.liruilongs.github.io]-[~/linux-amd64]
└─$cp helm /usr/local/bin/
┌──[root@vms81.liruilongs.github.io]-[~/linux-amd64]
└─$ls /usr/local/bin/
helm
「配置命令自動(dòng)補(bǔ)全，通過寫入/etc/profile 文件 souece < (helm completion bash)的方式配置命令自動(dòng)補(bǔ)全。配置完記得使用source /etc/profile去刷新配置」

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$helm --help | grep bash
completion generate autocompletions script for the specified shell (bash or zsh)
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$vim /etc/profile
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$source /etc/profile
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$cat /etc/profile | grep -v ^# | grep   source
source <(kubectl completion bash)
source <(helm completion bash)
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$
「驗(yàn)證安裝,查看Helm版本」

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$helm version
version.BuildInfo{Version:"v3.2.1", GitCommit:"fe51cd1e31e6a202cba7dead9552a6d418ded79a", GitTreeState:"clean", GoVersion:"go1.13.10"}
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$
配置helm源
「使用helm需要配置yaml源,常見的有阿里。微軟，和Githup上的源」

阿里云的源 https://apphub.aliyuncs.com
微軟azure的源 http://mirror.azure.cn/kubernetes/charts/
「查看所以的源」

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$helm repo list #查看所以的源
Error: no repositories to show
「添加指定是源」

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$helm repo add azure http://mirror.azure.cn/kubernetes/charts/

"azure" has been added to your repositories
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$helm repo add ali https://apphub.aliyuncs.com
"ali" has been added to your repositories
「查看剛才添加的yum源」

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$helm repo list
NAME    URL
azure   http://mirror.azure.cn/kubernetes/charts/
ali     https://apphub.aliyuncs.com
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$
Helm的常見用法
Helm的常見用法，包括搜索Chart、安裝Chart、自定義Chart配置、更新或回滾Release、刪除Release、創(chuàng)建自定義Chart、搭建私有倉庫等

helm search：搜索可用的Chart
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$helm search repo mysql
NAME                            CHART VERSION   APP VERSION     DESCRIPTION

ali/mysql                       6.8.0           8.0.19          Chart to create a Highly available MySQL cluster
ali/mysqldump                   2.6.0           2.4.1           A Helm chart to help backup MySQL databases usi...
ali/mysqlha                     1.0.0           5.7.13          MySQL cluster with a single master and zero or ...
ali/prometheus-mysql-exporter   0.5.2           v0.11.0         A Helm chart for prometheus mysql exporter with...
azure/mysql                     1.6.9           5.7.30          DEPRECATED - Fast, reliable, scalable, and easy...
azure/mysqldump                 2.6.2           2.4.1           DEPRECATED! - A Helm chart to help backup MySQL...
azure/prometheus-mysql-exporter 0.7.1           v0.11.0         DEPRECATED A Helm chart for prometheus mysql
。。。。。。。。。。

chart包拉取
「安裝chart可以直接使用命令安裝，也可以拉取到本地之后安裝，也可以直接通過命名行安裝」

「本地的Chart壓縮包(helm install mysql-1.6.4.tgz)」
「一個(gè)Chart目錄(helm install mysql/)」
「一個(gè)完整的URL(helm install https://example.com/charts/mysql-1.6.4.tgz)」
「chart包拉取」

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$helm pull azure/mysql --version=1.6.4
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$ls
mysql-1.6.4.tgz
helm install：安裝Chart
「chart包直接安裝」

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$#helm install db azure/mysql --version=1.6.4
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$
「拉取的chart包詳細(xì)信息，通過解壓之后查看」

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$ls
mysql-1.6.4.tgz
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$tar zxf mysql-1.6.4.tgz
.......
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$ls
mysql mysql-1.6.4.tgz
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$cd mysql/
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create/mysql]
└─$ls
Chart.yaml README.md templates values.yaml
yaml文件    描述
Chart.yaml    用于描述Chart信息的YAML文件,版本定義等
README.md    可選: README文件
values.yaml    默認(rèn)的配置值，即把可變的值抽離出來。
templates    可選:即模板，結(jié)合values.yaml,能夠生成Kubernetes的manifest文件
「對(duì)于下載好的yaml文件，我們可以修改后使用helm package 重新打包」

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$rm -rf mysql-1.6.4.tgz ; helm package mysql/
Successfully packaged chart and saved it to: /root/ansible/k8s-helm-create/mysql-1.6.4.tgz
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$ls
mysql mysql-1.6.4.tgz
「下面我們修改chart中的對(duì)應(yīng)鏡像為已經(jīng)下載好的mysql和busybox鏡像」

┌──[root@vms81.liruilongs.github.io]-[~/ansible]
└─$ansible 192.168.26.82 -m shell -a "docker images | grep mysql"
192.168.26.82 | CHANGED | rc=0 >>
mysql                                                     latest    ecac195d15af   2 months ago    516MB
mysql                                                     <none>    9da615fced53   3 months ago    514MB
hub.c.163.com/library/mysql                               latest    9e64176cd8a2   4 years ago     407MB
┌──[root@vms81.liruilongs.github.io]-[~/ansible]
└─$ansible 192.168.26.82 -m shell -a "docker images | grep busybox"
192.168.26.82 | CHANGED | rc=0 >>
busybox                                                   latest    ffe9d497c324   5 weeks ago     1.24MB
busybox                                                   <none>    7138284460ff   2 months ago    1.24MB
busybox                                                   <none>    cabb9f684f8b   2 months ago    1.24MB
busybox                                                   1.27      6ad733544a63   4 years ago     1.13MB
yauritux/busybox-curl                                     latest    69894251bd3c   5 years ago     21.3MB
┌──[root@vms81.liruilongs.github.io]-[~/ansible]
└─$fg
vim ./k8s-helm-create/mysql/values.yaml
┌──[root@vms81.liruilongs.github.io]-[~/ansible]
└─$
「通過修好的yaml文件創(chuàng)建chart」，「使用helm ls查看當(dāng)前運(yùn)行的chart」

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$helm ls
NAME    NAMESPACE       REVISION        UPDATED STATUS CHART   APP VERSION
「使用helm install運(yùn)行Chart」

「這里我們使用之前的那個(gè)mysq chart來安裝一個(gè)mysql」

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$cd mysql/
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create/mysql]
└─$helm install mydb .
NAME: mydb
LAST DEPLOYED: Thu Jan 13 01:51:42 2022
NAMESPACE: liruilong-network-create
STATUS: deployed
REVISION: 1
NOTES:
MySQL can be accessed via port 3306 on the following DNS name from within your cluster:
mydb-mysql.liruilong-network-create.svc.cluster.local

To get your root password run:

    MYSQL_ROOT_PASSWORD=$(kubectl get secret --namespace liruilong-network-create mydb-mysql -o jsonpath="{.data.mysql-root-password}" | base64 --decode; echo)

To connect to your database:

1. Run an Ubuntu pod that you can use as a client:

    kubectl run -i --tty ubuntu --image=ubuntu:16.04 --restart=Never -- bash -il

2. Install the mysql client:

    $ apt-get update && apt-get install mysql-client -y

3. Connect using the mysql cli, then provide your password:
    $ mysql -h mydb-mysql -p

To connect to your database directly from outside the K8s cluster:
    MYSQL_HOST=127.0.0.1
    MYSQL_PORT=3306

    # Execute the following command to route the connection:
    kubectl port-forward svc/mydb-mysql 3306

    mysql -h ${MYSQL_HOST} -P${MYSQL_PORT} -u root -p${MYSQL_ROOT_PASSWORD}
「查看是否是否運(yùn)行成功mydb的pod和SVC」

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create/mysql]
└─$kubectl get pods
NAME                          READY   STATUS    RESTARTS        AGE
mydb-mysql-7f8c5c47bd-82cts   1/1     Running   0               55s
pod1                          1/1     Running   2 (7d17h ago)   9d
pod2                          1/1     Running   3 (3d3h ago)    9d
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create/mysql]
└─$kubectl get svc
NAME         TYPE           CLUSTER-IP       EXTERNAL-IP      PORT(S)        AGE
mydb-mysql   ClusterIP      10.107.17.103    <none>           3306/TCP       62s
svc1         LoadBalancer   10.106.61.84     192.168.26.240   80:30735/TCP   9d
svc2         LoadBalancer   10.111.123.194   192.168.26.241   80:31034/TCP   9d
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create/mysql]
└─$
「安裝一個(gè)mysql客戶端測(cè)試OK」

┌──[root@vms82.liruilongs.github.io]-[~]
└─$yum install mariadb -y
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create/mysql]
└─$mysql -h10.107.17.103 -uroot -ptesting
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MySQL connection id is 7
Server version: 5.7.18 MySQL Community Server (GPL)

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MySQL [(none)]> use mysql
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
「刪除Release」

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create/mysql]
└─$helm del mydb
release "mydb" uninstalled
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create/mysql]
└─$helm ls
NAME    NAMESPACE       REVISION        UPDATED STATUS CHART   APP VERSION
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create/mysql]
└─$
「搭建私有Repository」
「自建的Chart之后自然需要搭建私有倉庫。下面使用Nginx搭建一個(gè)簡(jiǎn)單的Chart私有倉庫」

倉庫搭建
「?jìng)}庫搭建,找一臺(tái)機(jī)器運(yùn)行一個(gè)Nginx服務(wù)做倉庫，需要注意要對(duì)主頁數(shù)據(jù)做映射」

┌──[root@vms83.liruilongs.github.io]-[~]
└─$netstat -ntulp | grep 80
┌──[root@vms83.liruilongs.github.io]-[~]
└─$docker run -dit --name=helmrepo -p 8080:80 -v /data:/usr/share/nginx/html/charts docker.io/nginx
7201e001b02602f087105ca6096b0816acb03db02296c35c098a3dfddcb9c8d0
┌──[root@vms83.liruilongs.github.io]-[~]
└─$docker ps | grep helmrepo
7201e001b026   nginx                                               "/docker-entrypoint.…"   16 seconds ago      Up 15 seconds      0.0.0.0:8080->80/tcp, :::8080->80/tcp   helmrepo
「訪問測(cè)試」

┌──[root@vms83.liruilongs.github.io]-[~]
└─$curl 127.0.0.1:8080
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
。。。。。。。。
chart包上傳
「打包之前的mysql包，上傳helm私有倉庫。這里需要本讀生成索引文件index.yaml」

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$helm package mysql/
Successfully packaged chart and saved it to: /root/ansible/k8s-helm-create/mysql-1.6.4.tgz
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$helm repo index . --url http://192.168.26.83:8080/charts
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$ls
index.yaml mysql mysql-1.6.4.tgz
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$cd ..
「將索引文件和chart包一同上傳到私有倉庫」

┌──[root@vms81.liruilongs.github.io]-[~/ansible]
└─$ansible 192.168.26.83 -m copy -a "src=./k8s-helm-create/index.yaml dest=/data/"
192.168.26.83 | CHANGED => {
    "ansible_facts": {
        "discovered_interpreter_python": "/usr/bin/python"
    },
    "changed": true,
    "checksum": "233a0f3837d46af8a50098f1b29aa524b751cb29",
    "dest": "/data/index.yaml",
    "gid": 0,
    "group": "root",
    "md5sum": "66953d9558e44ab2f049dc602600ffda",
    "mode": "0644",
    "owner": "root",
    "size": 843,
    "src": "/root/.ansible/tmp/ansible-tmp-1642011407.72-76313-71345316897038/source",
    "state": "file",
    "uid": 0
}
┌──[root@vms81.liruilongs.github.io]-[~/ansible]
└─$ansible 192.168.26.83 -m copy -a "src=./k8s-helm-create/mysql-1.6.4.tgz dest=/data/"
192.168.26.83 | CHANGED => {
    "ansible_facts": {
        "discovered_interpreter_python": "/usr/bin/python"
    },
    "changed": true,
    "checksum": "4fddb1c13c71673577570e61f68f926af7255bad",
    "dest": "/data/mysql-1.6.4.tgz",
    "gid": 0,
    "group": "root",
    "md5sum": "929267de36f9be04e0adfb2f9c9f5812",
    "mode": "0644",
    "owner": "root",
    "size": 11121,
    "src": "/root/.ansible/tmp/ansible-tmp-1642011437.58-76780-127185287864942/source",
    "state": "file",
    "uid": 0
}
┌──[root@vms81.liruilongs.github.io]-[~/ansible]
└─$
倉庫索引文件更新
「如果添加新的chart包到私有倉庫，需要對(duì)于索引文件進(jìn)行更新」

「helm create 創(chuàng)建一個(gè)自定義的chart包」

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$helm create liruilonghelm
Creating liruilonghelm
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$ls
index.yaml liruilonghelm mysql mysql-1.6.4.tgz
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$helm package liruilonghelm/
Successfully packaged chart and saved it to: /root/ansible/k8s-helm-create/liruilonghelm-0.1.0.tgz
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$ls
index.yaml liruilonghelm liruilonghelm-0.1.0.tgz mysql mysql-1.6.4.tgz
「使用同樣的命令跟新索引文件」

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$helm repo index . --url http://192.168.26.83:8080/charts
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$cat index.yaml
「查看新的索引文件」

apiVersion: v1
entries:
liruilonghelm:
- apiVersion: v2
    appVersion: 1.16.0
    created: "2022-01-13T02:22:19.442365047+08:00"
    description: A Helm chart for Kubernetes
    digest: abb491f061cccc8879659149d96c99cbc261af59d5fcf8855c5e86251fbd53c1
    name: liruilonghelm
    type: application
    urls:
    - http://192.168.26.83:8080/charts/liruilonghelm-0.1.0.tgz
    version: 0.1.0
mysql:
- apiVersion: v1
    appVersion: 5.7.30
    created: "2022-01-13T02:22:19.444985984+08:00"
    description: Fast, reliable, scalable, and easy to use open-source relational
      database system.
    digest: 29153332e509765010c7e5e240a059550d52b01b31b69f25dd27c136dffec40f
    home: https://www.mysql.com/
    icon: https://www.mysql.com/common/logos/logo-mysql-170x115.png
    keywords:
    - mysql
    - database
    - sql
    maintainers:
    - email: o.with@sportradar.com
      name: olemarkus
    - email: viglesias@google.com
      name: viglesiasce
    name: mysql
    sources:
    - https://github.com/kubernetes/charts
    - https://github.com/docker-library/mysql
    urls:
    - http://192.168.26.83:8080/charts/mysql-1.6.4.tgz
    version: 1.6.4
generated: "2022-01-13T02:22:19.440764685+08:00"
「會(huì)發(fā)現(xiàn)索引文件已經(jīng)被更新，entries里有兩個(gè)對(duì)象，上傳相關(guān)的數(shù)據(jù)」

┌──[root@vms81.liruilongs.github.io]-[~/ansible]
└─$ansible 192.168.26.83 -m copy -a "src=./k8s-helm-create/index.yaml dest=/data/"
192.168.26.83 | CHANGED => {
    "ansible_facts": {
        "discovered_interpreter_python": "/usr/bin/python"
    },
    "changed": true,
    "checksum": "dbdc550a24159764022ede9428b9f11a09ccf291",
    "dest": "/data/index.yaml",
    "gid": 0,
    "group": "root",
    "md5sum": "b771d8e50dd49228594f8a566117f8bf",
    "mode": "0644",
    "owner": "root",
    "size": 1213,
    "src": "/root/.ansible/tmp/ansible-tmp-1642012325.1-89511-190591844764611/source",
    "state": "file",
    "uid": 0
}
┌──[root@vms81.liruilongs.github.io]-[~/ansible]
└─$ansible 192.168.26.83 -m copy -a "src=./k8s-helm-create/liruilonghelm-0.1.0.tgz dest=/data/"
192.168.26.83 | CHANGED => {
    "ansible_facts": {
        "discovered_interpreter_python": "/usr/bin/python"
    },
    "changed": true,
    "checksum": "f7fe8a0a7585adf23e3e23f8378e3e5a0dc13f92",
    "dest": "/data/liruilonghelm-0.1.0.tgz",
    "gid": 0,
    "group": "root",
    "md5sum": "04670f9b7e614d3bc6ba3e133bddae59",
    "mode": "0644",
    "owner": "root",
    "size": 3591,
    "src": "/root/.ansible/tmp/ansible-tmp-1642012352.54-89959-104738456182106/source",
    "state": "file",
    "uid": 0
}

用私有倉庫chart部署應(yīng)用程序
添加私有源
┌──[root@vms81.liruilongs.github.io]-[~/ansible]
└─$helm repo add liruilong_repo http://192.168.26.83:8080/charts
"liruilong_repo" has been added to your repositories
┌──[root@vms81.liruilongs.github.io]-[~/ansible]
└─$helm repo list
NAME            URL
azure           http://mirror.azure.cn/kubernetes/charts/
ali             https://apphub.aliyuncs.com
liruilong_repo http://192.168.26.83:8080/charts
「私有源查找安裝的chart」

┌──[root@vms81.liruilongs.github.io]-[~/ansible]
└─$helm search repo mysql | grep liruilong
liruilong_repo/mysql            1.6.4           5.7.30          Fast, reliable, scalable, and easy to use open-...
┌──[root@vms81.liruilongs.github.io]-[~/ansible]
└─$
安裝私有源chart
┌──[root@vms81.liruilongs.github.io]-[~/ansible]
└─$helm list
NAME    NAMESPACE       REVISION        UPDATED STATUS CHART   APP VERSION
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$helm install liruilongdb liruilong_repo/mysql
NAME: liruilongdb
LAST DEPLOYED: Thu Jan 13 02:42:41 2022
NAMESPACE: liruilong-network-create
STATUS: deployed
REVISION: 1
NOTES:
MySQL can be accessed via port 3306 on the following DNS name from within your cluster:
liruilongdb-mysql.liruilong-network-create.svc.cluster.local

To get your root password run:

    MYSQL_ROOT_PASSWORD=$(kubectl get secret --namespace liruilong-network-create liruilongdb-mysql -o jsonpath="{.data.mysql-root-password}" | base64 --decode; echo)

To connect to your database:

1. Run an Ubuntu pod that you can use as a client:

    kubectl run -i --tty ubuntu --image=ubuntu:16.04 --restart=Never -- bash -il

2. Install the mysql client:

    $ apt-get update && apt-get install mysql-client -y

3. Connect using the mysql cli, then provide your password:
    $ mysql -h liruilongdb-mysql -p

To connect to your database directly from outside the K8s cluster:
    MYSQL_HOST=127.0.0.1
    MYSQL_PORT=3306

    # Execute the following command to route the connection:
    kubectl port-forward svc/liruilongdb-mysql 3306

    mysql -h ${MYSQL_HOST} -P${MYSQL_PORT} -u root -p${MYSQL_ROOT_PASSWORD}
「驗(yàn)證安裝，查看chart列表」

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$helm list
NAME            NAMESPACE                       REVISION        UPDATED                                 STATUS         CHART            APP VERSION
liruilongdb     liruilong-network-create        1               2022-01-13 02:42:41.537928447 +0800 CST deployed       mysql-1.6.4      5.7.30
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$
「在helm install命令的執(zhí)行過程中，可以使用helm status命令跟蹤 Release的狀態(tài)：Helm不會(huì)等待所有創(chuàng)建過程的完成，這是因?yàn)橛行〤hart的Docker鏡像較大，會(huì)消耗很長的時(shí)間進(jìn)行下載和創(chuàng)建」

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$helm status liruilongdb
NAME: liruilongdb
LAST DEPLOYED: Thu Jan 13 02:42:41 2022
NAMESPACE: liruilong-network-create
STATUS: deployed
REVISION: 1
NOTES:
MySQL can be accessed via port 3306 on the following DNS name from within your cluster:
liruilongdb-mysql.liruilong-network-create.svc.cluster.local

To get your root password run:

    MYSQL_ROOT_PASSWORD=$(kubectl get secret --namespace liruilong-network-create liruilongdb-mysql -o jsonpath="{.data.mysql-root-password}" | base64 --decode; echo)

To connect to your database:

1. Run an Ubuntu pod that you can use as a client:

    kubectl run -i --tty ubuntu --image=ubuntu:16.04 --restart=Never -- bash -il

2. Install the mysql client:

    $ apt-get update && apt-get install mysql-client -y

3. Connect using the mysql cli, then provide your password:
    $ mysql -h liruilongdb-mysql -p

To connect to your database directly from outside the K8s cluster:
    MYSQL_HOST=127.0.0.1
    MYSQL_PORT=3306

    # Execute the following command to route the connection:
    kubectl port-forward svc/liruilongdb-mysql 3306

    mysql -h ${MYSQL_HOST} -P${MYSQL_PORT} -u root -p${MYSQL_ROOT_PASSWORD}
「在成功安裝Chart后，系統(tǒng)會(huì)在當(dāng)前命名空間內(nèi)創(chuàng)建一個(gè)ConfigMap用于保存Release對(duì)象的數(shù)據(jù)」

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$kubectl get configmaps
NAME                     DATA   AGE
kube-root-ca.crt         1      12d
liruilongdb-mysql-test   1      2d19h
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$kubectl describe configmaps liruilongdb-mysql-test
Name:         liruilongdb-mysql-test
Namespace:    liruilong-network-create
Labels:       app=liruilongdb-mysql
              app.kubernetes.io/managed-by=Helm
              chart=mysql-1.6.4
              heritage=Helm
              release=liruilongdb
Annotations: meta.helm.sh/release-name: liruilongdb
              meta.helm.sh/release-namespace: liruilong-network-create

Data
====
run.sh:
----
@test "Testing MySQL Connection" {
mysql --host=liruilongdb-mysql --port=3306 -u root -ptesting
}

BinaryData
====

Events: <none>
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$
「可以通過 helm delete 命令刪除運(yùn)行的Release」

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$kubectl get pods
NAME                                 READY   STATUS    RESTARTS      AGE
liruilongdb-mysql-5cbf489f65-6ff4q   1/1     Running   1 (56m ago)   26h
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$helm delete liruilongdb
release "liruilongdb" uninstalled
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$kubectl get pods
NAME                                 READY   STATUS        RESTARTS      AGE
liruilongdb-mysql-5cbf489f65-6ff4q   1/1     Terminating   1 (57m ago)   26h
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$
關(guān)于Helm和小伙伴就分享到這里，其實(shí)還有很大，比如chart更新回滾，模板導(dǎo)出等。有遇到的做補(bǔ)充。生活加油

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