CloudFoundry命令行和Kubernetes命令行的Restful API消费方式
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先說CloudFoundry的命令行工具CLI。我們在CloudFoundry環(huán)境下工作,第一個使用的命令就是cf login。
如果在環(huán)境變量里維護CF_TRACE的值為true:
則我們能發(fā)現(xiàn),諸如cf login這種命令,實際上也是通過消費Restful API來完成的。
下圖是cf login這個命令的api endpoint請求細(xì)節(jié),供大家參考:
API endpoint: https://api.cf.eu10.hana.ondemand.com
REQUEST: [2018-09-21T14:50:57+08:00]
GET /v2/info HTTP/1.1
Host: api.cf.eu10.hana.ondemand.com
Accept: application/json
Content-Type: application/json
User-Agent: go-cli 6.36.1+e3799ad7e.2018-04-04 / windows
RESPONSE: [2018-09-21T14:50:59+08:00]
HTTP/1.1 200 OK
Connection: close
Content-Length: 550
Content-Type: application/json;charset=utf-8
Date: Fri, 21 Sep 2018 06:50:58 GMT
Server: nginx
X-Content-Type-Options: nosniff
X-Vcap-Request-Id: abf32f52-294a-41f5-5919-be948d78f0dd::a32b17bb-da82-4d45-930f-f0344c8a83b3
{"name":"","build":"","support":"","version":0,"description":"Cloud Foundry at SAP Cloud Platform","authorization_endpoint":"https://login.cf.eu10.hana.ondemand.com","token_endpoint":"[PRIVATE DATA HIDDEN]","min_cli_version":null,"min_recommended_cli_version":null,"api_version":"2.115.0","app_ssh_endpoint":"ssh.cf.eu10.hana.ondemand.com:2222","app_ssh_host_key_fingerprint":"f3:12:47:b5:3a:19:6e:6c:4e:9d:90:2e:6f:8e:87:cc","app_ssh_oauth_client":"ssh-proxy","doppler_logging_endpoint":"wss://doppler.cf.eu10.hana.ondemand.com:443"}
REQUEST: [2018-09-21T14:50:59+08:00]
GET /login HTTP/1.1
Host: login.cf.eu10.hana.ondemand.com
Accept: application/json
Content-Type: application/json
User-Agent: go-cli 6.36.1+e3799ad7e.2018-04-04 / windows
API響應(yīng)結(jié)果:
RESPONSE: [2018-09-21T14:51:00+08:00]
HTTP/1.1 200 OK
Connection: close
Content-Length: 551
Cache-Control: no-store
Content-Language: en-US
Content-Type: application/json;charset=UTF-8
Date: Fri, 21 Sep 2018 06:50:59 GMT
Set-Cookie: X-Uaa-Csrf=8uoxBvyG8QCwo29efrrZNh; Max-Age=86400; Expires=Sat, 22-Sep-2018 06:51:00 GMT; Path=/; Secure; HttpOnly
Strict-Transport-Security: max-age=31536000 ; includeSubDomains
X-Content-Type-Options: nosniff
X-Frame-Options: DENY
X-Vcap-Request-Id: f6b29d8f-f78e-4c5e-61f3-5c9d906828ed
X-Xss-Protection: 1; mode=block
{"app":{"version":"4.19.0"},"links":{"uaa":"https://uaa.cf.eu10.hana.ondemand.com","passwd":"https://accounts.sap.com/ui/createForgottenPasswordMail?spName=cf.eu10.hana.ondemand.com","login":"https://login.cf.eu10.hana.ondemand.com","register":"https://accounts.sap.com/ui/public/showRegisterForm?spName=cf.eu10.hana.ondemand.com"},"zone_name":"uaa","entityID":"login.cf.eu10.hana.ondemand.com","commit_id":"7897100","idpDefinitions":{},"prompts":{"username":["text","Email"],"password":["password","Password"]},"timestamp":"2018-06-13T12:02:09-0700"}
Email>
再看Kubernetes。我們用的很多的命令:
kubectl get pods,返回pods列表。
而用命令行
kubectl --v=8 get pods
則發(fā)現(xiàn),get pods這個命令實際上也是發(fā)請求發(fā)往Kubernetes的API server:
https://<ip>:6443/api/v1/namespaces/default/pods?limit=500
API請求明細(xì)如下:
API server是Kubernetes最重要的核心組件之一:
1. 提供集群管理的REST API接口,包括認(rèn)證授權(quán)、數(shù)據(jù)校驗以及集群狀態(tài)變更等
2. 提供其他模塊之間的數(shù)據(jù)交互和通信的樞紐(其他模塊通過API Server查詢或修改
數(shù)據(jù),只有API Server才直接操作etcd)
kube-apiserver支持同時提供https(默認(rèn)監(jiān)聽在6443端口)和http API(默認(rèn)監(jiān)聽在
127.0.0.1的8080端口),其中http API是非安全接口,不做任何認(rèn)證授權(quán)機制,不建議
生產(chǎn)環(huán)境啟用。兩個接口提供的REST API格式相同,參考Kubernetes API Reference查
看所有API的調(diào)用格式。
在實際使用中,通常通過kubectl來訪問apiserver,也可以通過Kubernetes各個語言的
client庫來訪問apiserver。
比如上面get pods命令對應(yīng)的API的文檔:
https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.10/#list-62
要獲取更多Jerry的原創(chuàng)文章,請關(guān)注公眾號"汪子熙":
轉(zhuǎn)載于:https://my.oschina.net/u/3771578/blog/2253565
總結(jié)
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