SSH サーバーを起動するカスタムイメージの作成
SSH サーバーの稼働とログイン
ubuntu:16.04 からコンテナを起動し、openssl-server をインストール
$ sudo docker run -it ubuntu:16.04 /bin/bash
root@654ce674fac6:/# apt-get install openssh-server -y
root@654ce674fac6:/# mkdir /var/run/sshd
root@654ce674fac6:/# /usr/sbin/sshd
root@654ce674fac6:/# ps ax
PID TTY STAT TIME COMMAND
1 ? Ss 0:00 /bin/bash
5996 ? Ss 0:00 /usr/sbin/sshd
6014 ? R+ 0:00 ps axユーザーを追加し、ログインしてみる。
root@654ce674fac6:/# adduser docker
Adding user `docker' ...
Adding new group `docker' (1000) ...
Adding new user `docker' (1000) with group `docker' ...
Creating home directory `/home/docker' ...
Copying files from `/etc/skel' ...
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully
Changing the user information for docker
Enter the new value, or press ENTER for the default
Full Name []:
Room Number []:
Work Phone []:
Home Phone []:
Other []:
Is the information correct? [Y/n] Y
root@081308af8af2:/# slogin docker@localhost
docker@localhost's password:
Welcome to Ubuntu 16.04.3 LTS (GNU/Linux 4.9.51-10.52.amzn1.x86_64 x86_64)
* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage
Last login: Wed Nov 1 17:07:33 2017 from ::1
Connection to localhost closed.カスタマイズしたコンテナからイメージを作成
$ sudo docker commit -c "EXPOSE 22" -c "CMD /usr/sbin/sshd -D" 081308af8af2 docker/sshd
sha256:f97b8db88f79d396a2556a07dc93bea663a0e6032e937d18f1fbf58d65c4d096- -c オプションでイメージの設定を調整している。
- EXPOSE 22 は接続を TCP 22 番で待ち受ける設定、CMD /usr/sbin/sshd -D はコンテナ実行時に SSH サーバーを起動するための設定。
$ sudo docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
docker/sshd latest f97b8db88f79 About a minute ago 594 MB
ubuntu 16.04-ssh 79bdfa4d5921 7 minutes ago 594 MB
centos centos7-emacs-installed fb048d27b696 27 hours ago 557 MB
httpd 2.4.29 a8bdc7fdaa4f 8 days ago 177 MB
ubuntu 16.04 747cb2d60bbe 3 weeks ago 122 MB
centos centos7 196e0ce0c9fb 6 weeks ago 197 MBカスタムイメージの動作確認
$ sudo docker run -d -p 10022:22 docker/sshd
bb3ba7b6a5a74e239bc301078ab009630b032ec2a746f20fd62d22370ffa3a7e
$ sudo docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
bb3ba7b6a5a7 docker/sshd "/bin/sh -c '/usr/..." 28 seconds ago Up 27 seconds 0.0.0.0:10022->22/tcp kickass_bhabha
$ slogin -p 10022 docker@localhost
The authenticity of host '[localhost]:10022 ([127.0.0.1]:10022)' can't be established.
ECDSA key fingerprint is SHA256:AZO+QDmQrZNYhxP/Yr1sA5lbUl+XuXzuLep1P8OyB04.
ECDSA key fingerprint is MD5:98:f5:a2:92:b5:fe:85:49:6c:28:8b:e3:b2:0d:69:51.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '[localhost]:10022' (ECDSA) to the list of known hosts.
docker@localhost's password:
Welcome to Ubuntu 16.04.3 LTS (GNU/Linux 4.9.51-10.52.amzn1.x86_64 x86_64)
* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage
Last login: Wed Nov 1 17:12:06 2017 from ::1
Connection to localhost closed.