How to execute command in a pod (kubernetes) using API?

Question

I\'m trying to execute command in a contianer (in a Kubernetes POD on GKE with kubernetes 1.1.2).

Reading documentation I understood that I can use GET or POST quer

Answer 1

You'll probably have the best time using the Kubernetes client library, which is the same code the Kubectl uses, but if for some reason that isn't an option, than my best suggestion is to look through the client library's code for executing remote commands and seeing what headers it sets.

Answer 2

You can using a websocket client to exec into a pod, a quick demo.

javascript code shows how to connect to kubernetes:

<script type="text/javascript">
    angular.module('exampleApp', ['kubernetesUI'])
        .config(function(kubernetesContainerSocketProvider) {
            kubernetesContainerSocketProvider.WebSocketFactory = "CustomWebSockets";
        })
        .run(function($rootScope) {
            $rootScope.baseUrl = "ws://localhost:8080";
            $rootScope.selfLink = "/api/v1/namespaces/default/pods/my-nginx-3855515330-l1uqk";
            $rootScope.containerName = "my-nginx";
            $rootScope.accessToken = "";
            $rootScope.preventSocket = true;
        })
        /* Our custom WebSocket factory adapts the url */
        .factory("CustomWebSockets", function($rootScope) {
            return function CustomWebSocket(url, protocols) {
                url = $rootScope.baseUrl + url;
                if ($rootScope.accessToken)
                    url += "&access_token=" + $rootScope.accessToken;
                return new WebSocket(url, protocols);
            };
        });
</script>

you can test it in other language.

Answer 3

Use websocket client it's work.

In my local kuberenetes cluster, the connection metadata like this:

ApiServer = "172.21.1.11:8080"
Namespace = "default"
PodName = "my-nginx-3855515330-l1uqk"
ContainerName = "my-nginx"
Commands = "/bin/bash"

the connect url:

"ws://172.21.1.11:8080/api/v1/namespaces/default/pods/my-nginx-3855515330-l1uqk/exec?container=my-nginx&stdin=1&stdout=1&stderr=1&tty=1&command=%2Fbin%2Fbash"

On maxos, a wsclient CLI tool: wscat, you can use it as a test tool:

You can access the websocket example: "https://github.com/lth2015/container-terminal"