我有以下应用程序

SpringApplication.run(Application.class, args);
        SshServer  sshd = SshServer.setUpDefaultServer();
        sshd.setHost("localhost");

        sshd.setKeyPairProvider(new SimpleGeneratorHostKeyProvider());
        //Accept all keys for authentication
        sshd.setPublickeyAuthenticator((s, publicKey, serverSession) -> true);
        //Allow username/password authentication using pre-defined credentials
        sshd.setPasswordAuthenticator(new PasswordAuthenticator() {
            public boolean authenticate(String username, String password, ServerSession session) {
                return "tomek".equals(username) && "123".equals(password);
            }
        });

        sshd.setPort(6777);

        sshd.start();

打开端口6777上的ssh服务器。现在我把它做了记号

FROM ubuntu:latest

RUN apt update && apt install  openssh-server sudo -y

RUN useradd -rm -d /home/ubuntu -s /bin/bash -g root -G sudo -u 1000 test

RUN apt-get install -y --no-install-recommends software-properties-common
RUN add-apt-repository -y ppa:openjdk-r/ppa
RUN apt-get update
RUN apt-get install -y openjdk-11-jdk
RUN apt-get install -y openjdk-11-jre
RUN update-alternatives --config java
RUN update-alternatives --config javac

ARG JAR_FILE=target/ssh.demo-0.0.1-SNAPSHOT.jar

# cd /usr/local/runme

# copy target/find-links.jar /usr/local/runme/app.jar

COPY ${JAR_FILE} app.jar

# copy project dependencies

# cp -rf target/lib/  /usr/local/runme/lib

ADD ${JAR_LIB_FILE} lib/

# java -jar /usr/local/runme/app.jar

ENTRYPOINT ["java","-jar","app.jar"]

RUN mkdir /var/run/sshd
CMD ['/usr/sbin/sshd', '-D']

run命令

docker run -p 6662:6777 -d <image_name>

我进入docker容器并使用以下命令成功地ssh到其中

docker exec -it <container_id> /bin/bash
ssh tomek@localhost -p 6777

但是当我使用端口6662从外部ssh它时。

ssh tomek@localhost -p 6662

我犯了以下错误

ssh_exchange_identification: Connection closed by remote host

为什么连接被拒绝了？我必须向主机文件添加任何内容吗