.NET在容器中操作宿主机

在 docker 容器中想操作宿主机，一般会使用 ssh 的方式，然后 .Net 通过执行远程 ssh 指令来操作宿主机。本文将使用 交互式 .Net 容器版 中提供的镜像演示 .Net 在容器中如何操作宿主机。.

1. 宿主机上生成 ssh key

生成 ssh key：

ssh-keygen -t rsa -b 4096

把 public key 加入到 authorized_keys：

cat /root/.ssh/id_rsa.pub > /root/.ssh/authorized_keys

2. 启动容器

启动容器，并把 private key 挂载到容器中：

docker run --name dotnet-interactive -d -v /root/.ssh/id_rsa:/root/.ssh/id_rsa -p 80:8888 dotnet-interactive:1.0.0
docker ps

3. 安装 ssh client

打开网页并进入 Terminal：

安装 ssh client：

# 更新源
apt-get update -y

# 安装 ssh client
apt-get install openssh-client -y

检查 ssh client 安装情况：

ssh --help

操作演示 

1. 指令获取容器主机名

hostname

2. 指令获取宿主机主机名

ssh -q -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o PasswordAuthentication=no -i /root/.ssh/id_rsa {user}@{nodeIp} "hostname"

3. .Net 获取容器主机名

using System.Diagnostics;
public string ExecuteCommand(string command)
{
    var escapedArgs = command.Replace("\"", "\\\"");
    var process = new Process
    {
        StartInfo = new ProcessStartInfo
        {
            FileName = "/bin/bash",
            Arguments = $"-c \"{escapedArgs}\"",
            RedirectStandardOutput = true,
            RedirectStandardError = true,
            UseShellExecute = false,
            CreateNoWindow = true
        }
    };
    process.Start();
    process.WaitForExit();
    var message = process.StandardOutput.ReadToEnd();
    message += process.StandardOutput.ReadToEnd();
    return message;
}
var hostname = ExecuteCommand("hostname");
hostname

4. .Net 获取宿主机主机名

public string ExecuteCommandSSH(string ip, string rootUser, string command)
{
    var script = $"ssh -q -o \"StrictHostKeyChecking no\" -o \"UserKnownHostsFile=/dev/null\" -i /keys/{ip}/sshkey/id_rsa \"{rootUser}@{ip}\" \"{command}\"";
    return ExecuteCommand(script);
}
var hostname2 = ExecuteCommandSSH("10.0.0.2", "root", "hostname");
hostname2