DockerコンテナにSSHでログインする

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> docker --version
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Docker version 26.0.0, build 2ae903e

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FROM ubuntu:24.04
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RUN apt-get update && apt-get install -y openssh-server
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RUN mkdir /var/run/sshd
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RUN adduser test-user --disabled-password
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RUN echo 'test-user:passw0rd' | chpasswd
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RUN sed -i 's/#PasswordAuthentication yes/PasswordAuthentication yes/g' /etc/ssh/sshd_config
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EXPOSE 22
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CMD ["/usr/sbin/sshd", "-D"]

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cd [Dockerfile保存フォルダ]

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docker build -t my_ubuntu_24.04 .

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PS XXX> docker build -t my_ubuntu_24.04 .
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[+] Building 0.0s (0/0)  docker:default
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2024/10/20 21:29:10 http2: server: error reading preface from client //./pipe/docker_engine: file has already been close[+] Building 4.4s (10/10) FINISHED                                                                       docker:default
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 => [internal] load build definition from Dockerfile                                                               0.1s
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 => => transferring dockerfile: 362B                                                                               0.0s
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 => [internal] load metadata for docker.io/library/ubuntu:24.04                                                    0.0s
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 => [internal] load .dockerignore                                                                                  0.0s
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 => => transferring context: 2B                                                                                    0.0s
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 => [1/6] FROM docker.io/library/ubuntu:24.04                                                                      0.0s
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 => CACHED [2/6] RUN apt-get update && apt-get install -y openssh-server                                           0.0s
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 => CACHED [3/6] RUN mkdir /var/run/sshd                                                                           0.0s
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 => [4/6] RUN adduser test-user --disabled-password                                                                1.9s
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 => [5/6] RUN echo 'test-user:passw0rd' | chpasswd                                                                 1.0s
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 => [6/6] RUN sed -i 's/#PasswordAuthentication yes/PasswordAuthentication yes/g' /etc/ssh/sshd_config             0.8s
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 => exporting to image                                                                                             0.4s
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 => => exporting layers                                                                                            0.3s
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 => => writing image sha256:aa41c0f91405847ba6d392663540b41718117183c6598cd9c9b46189a5e0ad1f                       0.0s
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 => => naming to docker.io/library/my_ubuntu_24.04                                                                 0.0s
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What's Next?
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  View a summary of image vulnerabilities and recommendations → docker scout quickview

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docker images

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REPOSITORY        TAG       IMAGE ID       CREATED          SIZE
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my_ubuntu_24.04   latest    aa41c0f91405   26 seconds ago   259MB

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docker run -d -p 2222:22 my_ubuntu_24.04

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docker ps

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CONTAINER ID   IMAGE             COMMAND               CREATED          STATUS          PORTS                  NAMES
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c97efccb4fa4   my_ubuntu_20.04   "/usr/sbin/sshd -D"   27 seconds ago   Up 24 seconds   0.0.0.0:2222->22/tcp   dreamy_easley

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ssh test-user@localhost -p 2222

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The authenticity of host '[localhost]:2222 ([::1]:2222)' can't be established.
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ED25519 key fingerprint is SHA256:XXX.
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This key is not known by any other names.
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Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
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Warning: Permanently added '[localhost]:2222' (ED25519) to the list of known hosts.
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test-user@localhost's password:
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Welcome to Ubuntu 24.04 LTS (GNU/Linux 5.15.146.1-microsoft-standard-WSL2 x86_64)
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 * Documentation:  https://help.ubuntu.com
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 * Management:     https://landscape.canonical.com
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 * Support:        https://ubuntu.com/pro
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This system has been minimized by removing packages and content that are
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not required on a system that users do not log into.
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To restore this content, you can run the 'unminimize' command.
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The programs included with the Ubuntu system are free software;
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the exact distribution terms for each program are described in the
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individual files in /usr/share/doc/*/copyright.
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Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
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applicable law.
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test-user@e3aac2e193be:~$