AspNetCore容器化(Docker)部署(二) —

一.前言

着上一篇 AspNetCore容器化(Docker)部署(一) —— 入门，在单个容器helloworld的基础上引入nginx反向代理服务器组成多容器应用。

二.配置反向代理转接

配置转接头。详见：https://docs.microsoft.com/zh-cn/aspnet/core/host-and-deploy/linux-nginx?view=aspnetcore-2.2

Startup.cs

public void Configure(IApplicationBuilder app, IHostingEnvironment env)

{

    if (env.IsDevelopment())

    {

        app.UseDeveloperExceptionPage();

    }

    else

    {

        app.UseExceptionHandler("/Home/Error");

    }

    app.UseForwardedHeaders(new ForwardedHeadersOptions

    {

        ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto

    });

    app.UseStaticFiles();

    app.UseCookiePolicy();

    app.UseMvc(routes =>

    {

        routes.MapRoute(

            name: "default",

            template: "{controller=Home}/{action=Index}/{id?}");

    });

}

重新构建helloworld镜像并生成容器

PS C:\Users\Administrator> docker images

REPOSITORY                             TAG                 IMAGE ID            CREATED             SIZE

helloworld                             v1.1                a57e147d8487        About an hour ago   265MB

mcr.microsoft.com/dotnet/core/sdk      2.2-stretch         e4747ec2aaff        2 weeks ago         1.74GB

mcr.microsoft.com/dotnet/core/aspnet   2.2-stretch-slim    f6d51449c477        2 weeks ago         260MB

docker4w/nsenter-dockerd               latest              2f1c802f322f        7 months ago        187kB

PS C:\Users\Administrator> docker ps -a

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                                      NAMES

c8ec48808318        helloworld:v1.1     "dotnet HelloWorld.d…"   About an hour ago   Up 12 minutes       0.0.0.0:81->80/tcp                         netcore_helloworld

三.Nginx容器

nginx官方镜像和构建教程 https://hub.docker.com/_/nginx

1.创建一个Nginx配置文件

helloworld.conf

server {

  listen 801; #监听801端口

  location / {

    proxy_pass http://netcore_helloworld:80; #默认80端口可不加端口号，这里转发没有使用IP而是containerId

  }

}

2.自定义Nginx镜像的Dockerfile

#定义基础镜像 nginx:latest

FROM nginx

#复制自定义的配置文件到Nginx配置文件目录下

COPY helloworld.conf /etc/nginx/conf.d/helloworld.conf

#暴露80端口到外部

EXPOSE 80

#容器运行参数

CMD ["nginx", "-g", "daemon off;"]

3.构建mynginx镜像

PS C:\Users\Administrator> cd C:\Users\Administrator\source\repos\AspNetCore_Docker\MyNginx

PS C:\Users\Administrator\source\repos\AspNetCore_Docker\MyNginx> docker build -t mynginx:v1.0 .

Sending build context to Docker daemon  3.072kB

Step 1/4 : FROM nginx

 ---> 62c261073ecf

Step 2/4 : COPY helloworld.conf /etc/nginx/conf.d/helloworld.conf

 ---> 0514a786be49

Step 3/4 : EXPOSE 80

 ---> Running in 0693d4c225ef

Removing intermediate container 0693d4c225ef

 ---> 7546051297e3

Step 4/4 : CMD ["nginx", "-g", "daemon off;"]

 ---> Running in 7f7634a0d689

Removing intermediate container 7f7634a0d689

 ---> 4b260c730139

Successfully built 4b260c730139

Successfully tagged mynginx:v1.0

SECURITY WARNING: You are building a Docker image from Windows against a non-Windows Docker host. All files and directories added to build context will have '-rwxr-xr-x' permissions. It is recommended to double check and reset permissions for sensitive files and directories.

PS C:\Users\Administrator\source\repos\AspNetCore_Docker\MyNginx> docker images

REPOSITORY                             TAG                 IMAGE ID            CREATED             SIZE

mynginx                                v1.0                f554133b97ee        9 seconds ago       109MB

helloworld                             v1.1                a57e147d8487        About an hour ago   265MB

nginx                                  latest              62c261073ecf        5 days ago          109MB

mcr.microsoft.com/dotnet/core/sdk      2.2-stretch         e4747ec2aaff        2 weeks ago         1.74GB

mcr.microsoft.com/dotnet/core/aspnet   2.2-stretch-slim    f6d51449c477        2 weeks ago         260MB

docker4w/nsenter-dockerd               latest              2f1c802f322f        7 months ago        187kB

4.创建Nginx容器

容器内80和801端口分别映射到外部(宿主机)的80和801端口，-p 外部端口:内部端口

PS C:\Users\Administrator> docker run --name mynginx -d -p 801:801 -p 80:80 f554133b97ee

1b2751b1dba6bb4b97f8c78cda8646709ea80da03e5136025cf52dc3a3cc740d

PS C:\Users\Administrator> docker ps -a

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                                      NAMES

dae033fe1b5c        f554133b97ee        "nginx -g 'daemon of…"   18 seconds ago      Up 17 seconds       0.0.0.0:80->80/tcp, 0.0.0.0:801->801/tcp   mynginx

c8ec48808318        helloworld:v1.1     "dotnet HelloWorld.d…"   8 minutes ago       Up 8 minutes        0.0.0.0:81->80/tcp                         netcore_helloworld

5.验证Nginx

80端口访问正常

801端口转发失败，应该说是无法识别http://netcore_helloworld这个地址，因为容器之间是相互隔离的。

所以需要使用bridge networks创建一个桥接网络将多个容器(网络)连接起来进行通信。

另外，使用link的方式进行ip映射也可以达到容器间通信的效果，跟windows里面修改hosts文件ip映射hostname类似，需要注意的是link这个(废弃)已过时的特性会在将来的版本中移除，不推荐使用。

四.Docker Network

官方介绍 https://docs.docker.com/network/

1.创建一个network

docker network create [OPTIONS] NETWORK

PS C:\Users\Administrator> docker network create mybridge

475a135ea2524de25f5594e35f2640e39c22365336092dc34f17e1019252eab1

PS C:\Users\Administrator> docker network ls

NETWORK ID          NAME                DRIVER              SCOPE

d1110fd56b8c        bridge              bridge              local

194bf7b8bfea        mybridge            bridge              local

c8ddf53079b8        host                host                local

522c9e7cfbcb        none                null                local

2.将容器加入到network

docker network connect [OPTIONS] NETWORK CONTAINER

加入之后需要重启容器，或者在创建容器时就指定docker run --network=bridgename ....

PS C:\Users\Administrator> docker network connect mybridge dae033fe1b5c

PS C:\Users\Administrator> docker network connect mybridge c8ec48808318

PS C:\Users\Administrator> docker restart dae033fe1b5c c8ec48808318

dae033fe1b5c

c8ec48808318

查看mybridge的information

PS C:\Users\Administrator> docker inspect 194bf7b8bfea

[

    {

        "Name": "mybridge",

        "Id": "194bf7b8bfeafdbfb8842c0d6252962c8cb1367c60d8742c5830c4446b571198",

        "Created": "2019-05-21T06:07:35.1683249Z",

        "Scope": "local",

        "Driver": "bridge",

        "EnableIPv6": false,

        "IPAM": {

            "Driver": "default",

            "Options": {},

            "Config": [

                {

                    "Subnet": "172.18.0.0/16",

                    "Gateway": "172.18.0.1"

                }

            ]

        },

        "Internal": false,

        "Attachable": false,

        "Ingress": false,

        "ConfigFrom": {

            "Network": ""

        },

        "ConfigOnly": false,

        "Containers": {

            "c8ec488083184ff419cb1a2b1b67fb92520db276263ee43e97c3f30aa58314d0": {

                "Name": "netcore_helloworld",

                "EndpointID": "a21a766a83887b1c5ce44b75affb2bce78433ad307b8a5fa0f991969492ace4c",

                "MacAddress": "02:42:ac:12:00:04",

                "IPv4Address": "172.18.0.4/16",

                "IPv6Address": ""

            },

            "dae033fe1b5c79c2604df3facb4c714a56e49f3501c34bda125a786b28faef88": {

                "Name": "mynginx",

                "EndpointID": "4119532667d868d735c15f584e6e7e27d48308808ef8b58e4d85a8b3e626791a",

                "MacAddress": "02:42:ac:12:00:03",

                "IPv4Address": "172.18.0.3/16",

                "IPv6Address": ""

            }

        },

        "Options": {},

        "Labels": {}

    }

]

3.验证

示例代码Github地址：https://github.com/wwwu/AspNetCore_Docker

AspNetCore容器化(Docker)部署(一) —— 入门
AspNetCore容器化(Docker)部署(二) —— 多容器通信
AspNetCore容器化(Docker)部署(三) —— Docker Compose容器编排
AspNetCore容器化(Docker)部署(四) —— Jenkins自动化部署