Docker 与 K8S学习笔记（十）—

我们一般将应用部署在容器里面，而一个服务器上会有许许多多的容器，那么外界该如何访问我们的应用呢？答案是：端口映射。

Docker可以将容器对外提供服务的端口映射到host的某个端口上，外网通过此端口访问容器，要开启此功能，容器在启动时需要通过-p参数指定映射的端口号。

$ sudo docker run -d -p 80 nginx

0627d4b5aefe03d4d99a92b559d3e58d789c006961722178c9f1e94f0f270492

$ sudo docker ps

CONTAINER ID   IMAGE     COMMAND                  CREATED         STATUS         PORTS                                     NAMES

0627d4b5aefe   nginx     "/docker-entrypoint.…"   9 seconds ago   Up 8 seconds   0.0.0.0:49153->80/tcp, :::49153->80/tcp   stupefied_brahmagupta

$ curl 127.0.0.1:49153

<!DOCTYPE html>

<html>

<head>

<title>Welcome to nginx!</title>

<style>

html { color-scheme: light dark; }

body { width: 35em; margin: 0 auto;

font-family: Tahoma, Verdana, Arial, sans-serif; }

</style>

</head>

<body>

<h1>Welcome to nginx!</h1>

<p>If you see this page, the nginx web server is successfully installed and

working. Further configuration is required.</p>

<p>For online documentation and support please refer to

<a href="http://nginx.org/">nginx.org</a>.<br/>

Commercial support is available at

<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>

</body>

</html>

我们可以看到，使用-p 80参数后，docker将容器中80端口映射到host的49153端口，所以我们在host直接通过49153端口就能访问到nginx服务。

那我们能否自行指定所要映射的host的端口号呢？这也是可以的，我们只需要在-p参数中将host的端口也指定上就可以了：

$ sudo docker run -d -p 8080:80 nginx

13cd7862e4d74238599e9321e897ea03cf2c01f837202bb4363ea48d052c850e

$ sudo docker ps

CONTAINER ID   IMAGE     COMMAND                  CREATED         STATUS         PORTS                                   NAMES

13cd7862e4d7   nginx     "/docker-entrypoint.…"   9 seconds ago   Up 7 seconds   0.0.0.0:8080->80/tcp, :::8080->80/tcp   kind_kirch

$ curl 127.0.0.1:8080

<!DOCTYPE html>

<html>

<head>

<title>Welcome to nginx!</title>

<style>

html { color-scheme: light dark; }

body { width: 35em; margin: 0 auto;

font-family: Tahoma, Verdana, Arial, sans-serif; }

</style>

</head>

<body>

<h1>Welcome to nginx!</h1>

<p>If you see this page, the nginx web server is successfully installed and

working. Further configuration is required.</p>

<p>For online documentation and support please refer to

<a href="http://nginx.org/">nginx.org</a>.<br/>

Commercial support is available at

<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>

</body>

</html>

巴特西

Docker 与 K8S学习笔记（十）—— 容器的端口映射

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