SSH 到 Docker：权限被拒绝（公钥）

Question

我正在运行一个 docker 容器，并想使用 emacs 的 tramp 包 ssh 到它。我可以成功使用docker exec -it containername bash。但我只想用我的 emacs 来做配置工作。我已经将容器的 22 端口暴露给 localhost 的 22 端口。

顺便说一句，我的.ssh 文件夹中有id_rsa。

但是，即使我使用ssh -p 22 dwolf@localhost，它仍然无法正常工作。日志如下：

OpenSSH_7.4p1, LibreSSL 2.5.0
debug1: Reading configuration data /Users/spacegoing/.ssh/config
debug1: /Users/spacegoing/.ssh/config line 26: Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Connecting to localhost [::1] port 22.
debug1: connect to address ::1 port 22: Connection refused
debug1: Connecting to localhost [127.0.0.1] port 22.
debug1: Connection established.
debug1: identity file /Users/spacegoing/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/spacegoing/.ssh/id_rsa-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.4
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.0p1 Debian-4+deb7u3
debug1: match: OpenSSH_6.0p1 Debian-4+deb7u3 pat OpenSSH* compat 0x04000000
debug1: Authenticating to localhost:22 as 'dwolf'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: ecdh-sha2-nistp256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: aes128-ctr MAC: umac-64@openssh.com compression: none
debug1: kex: client->server cipher: aes128-ctr MAC: umac-64@openssh.com compression: none
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:w7Y3BsQ1xof3U5cohsL5y9ctWvgNaTuXdbDFwQtE+Gc
debug1: Host 'localhost' is known and matches the ECDSA host key.
debug1: Found key in /Users/spacegoing/.ssh/known_hosts:26
debug1: rekey after 4294967296 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: rekey after 4294967296 blocks
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /Users/spacegoing/.ssh/id_rsa
debug1: Authentications that can continue: publickey
debug1: No more authentication methods to try.
Permission denied (publickey).

Answer 1

这三行：

debug1: Next authentication method: publickey
debug1: Offering RSA public key: /Users/spacegoing/.ssh/id_rsa
debug1: Authentications that can continue: publickey

表明你提供了一个公钥，但它被拒绝了；您不在目标主机的 authorized_keys 文件中。

要将你的公钥复制到docker镜像中，你可以使用这个oneliner，当然，还有很多其他的方法可以将你的公钥复制到机器中。

dd if=~/.ssh/id_rsa.pub | docker exec -it containername dd of=~/.ssh/authorized_keys

正如有人指出的那样，您的容器应该尽可能小，理想情况下甚至不需要自己的 SSH 服务器；但同样，每个人的用例都不同。

此命令将覆盖目标上任何现有的授权密钥

Answer 2

看看这一行：

debug1: identity file /Users/spacegoing/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory

您的设备上似乎没有 id_rsa 密钥以及何时

debug1: Next authentication method: publickey

找不到它并退出，请尝试使用以下命令添加此密钥：

cd ~/.ssh/
ssh-keygen id_rsa

然后对所有问题按 Enter 键并重复您的连接。