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ClonedOne
Asked: 2019-04-03 17:19:28 +0800 CST

Docker 容器 ssh 错误：ssh_exchange_identification: Connection closed by remote host

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我正在尝试设置一个 Ubuntu 容器，openssh-server这样我就可以从主机 ssh 进入它。我知道这不是标准的做法，但我真的很想拥有ssh.

这是我的Dockerfile

# Select base image
FROM ubuntu:16.04

# Set the current working directory
WORKDIR /home

# Update the system, download any packages essential for the project
RUN dpkg --add-architecture i386
RUN apt-get update && apt-get upgrade -y
RUN apt-get install -y git build-essential make gcc vim net-tools iputils-ping ca-certificates openssh-server libc6:i386 libstdc++6:i386

# Allow ssh root login
RUN echo "root:root" | chpasswd

# RUN rpl "PermitRootLogin prohibit-password" "PermitRootLogin yes" /etc/ssh/sshd_config
RUN sed -i 's/prohibit-password/yes/' /etc/ssh/sshd_config

RUN cat /etc/ssh/sshd_config
RUN mkdir /root/.ssh

RUN chown -R root:root /root/.ssh;chmod -R 700 /root/.ssh

RUN echo “StrictHostKeyChecking=no” >> /etc/ssh/ssh_config

RUN service ssh restart


# Open port 22 so linked containers can see it
EXPOSE 22

# Import any additional files into the environment (from the host)
ADD otherfile .

我启动容器，docker run -t -d -p 2222:22但每当我尝试 ssh 进入它时，我总是会收到错误ssh_exchange_identification: Connection closed by remote host：

➜ ssh -v -p 2222 root@localhost /bin/bash
OpenSSH_7.9p1, LibreSSL 2.7.3
debug1: Reading configuration data /Users/giorgio/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 48: Applying options for *
debug1: /etc/ssh/ssh_config line 52: Applying options for *
debug1: Connecting to localhost port 2222.
debug1: Connection established.
debug1: identity file /Users/giorgio/.ssh/id_rsa type -1
debug1: identity file /Users/giorgio/.ssh/id_rsa-cert type -1
debug1: identity file /Users/giorgio/.ssh/id_dsa type -1
debug1: identity file /Users/giorgio/.ssh/id_dsa-cert type -1
debug1: identity file /Users/giorgio/.ssh/id_ecdsa type -1
debug1: identity file /Users/giorgio/.ssh/id_ecdsa-cert type -1
debug1: identity file /Users/giorgio/.ssh/id_ed25519 type -1
debug1: identity file /Users/giorgio/.ssh/id_ed25519-cert type -1
debug1: identity file /Users/giorgio/.ssh/id_xmss type -1
debug1: identity file /Users/giorgio/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.9
ssh_exchange_identification: Connection closed by remote host

有谁知道导致此错误的原因以及如何解决？

ssh linux ubuntu

1 个回答

  1. Best Answer

    RUN service ssh restart

    这会在映像创建阶段运行 ssh 服务重启（实际上是启动），而不是在未来运行的容器中。你里面没有CMDnor所以它默认为你的基本图像中配置的那个（它是 bash）ENTRYPOINTDockerfile

    换句话说，启动容器时没有运行 ssh 守护进程。一个临时的解决方案是在正在运行的容器上启动一个 exec 命令：docker exec your_container_name service ssh start

    要正确解决此问题，您需要指示映像在创建容器时启动 sshd（请参阅 docker 文档中的dockerize an ssh 服务）。简而言之：

    • 删除RUN service ssh restart线
    • 添加下两行
    RUN mkdir /var/run/sshd
CMD ['/usr/sbin/sshd', '-D']
    • 重建你的形象，启动一个新的容器，ssh 并享受。
    • 4

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