dev

.gitignore

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+
+# Try to prevent ssh keyfiles from accidentally reaching git. 
+*id_rsa*
+*key*
+*priv*
+*ssh*

Dockerfile

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+FROM alpine:3.10
+ADD ./id_rsa.pub /root/.ssh/authorized_keys
+
+RUN apk add --update openssh shadow \
+&& rm -rf /rmp/* /var/cache/apk/* \ 
+&& chown root:root /root/.ssh/authorized_keys \
+&& chmod 700 /root/.ssh \
+&& chmod 700 /root/.ssh/authorized_keys \
+&& mkdir -p /var/run/sshd \
+&& ssh-keygen -f /etc/ssh/ssh_host_dsa_key -N '' -t dsa \
+&& ssh-keygen -f /etc/ssh/ssh_host_rsa_key -N '' -t rsa \
+&& usermod -p '*' root \
+&& sed -i 's/AllowTcpForwarding no/AllowTcpForwarding yes/g' /etc/ssh/sshd_config \
+&& sed -i 's/GatewayPorts no/GatewayPorts yes/g' /etc/ssh/sshd_config \   
+&& printf "\nMatch User root\n  AllowTcpForwarding yes\n  X11Forwarding no\n  AllowAgentForwarding no\n  ForceCommand /bin/false" >> /etc/ssh/sshd_config
+
+
+EXPOSE 22
+CMD ["/usr/sbin/sshd","-D"]

build

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+docker build . -t ssh-reverse-proxy && docker run -d -p 2222:22 -p 22222:22222 --name ssh-test ssh-reverse-proxy

rm

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+docker stop ssh-test && docker rm ssh-test
+rm ~/.ssh/known_hosts

shell

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+docker exec -it ssh-test sh