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FROM alpine:3.5
RUN apk add --no-cache openssh

# for sshd
RUN set -ex \
    && sed -i "s/#PermitRootLogin.*/PermitRootLogin yes/g" /etc/ssh/sshd_config \
    && ssh-keygen -t rsa -P "" -f /etc/ssh/ssh_host_rsa_key \
    && ssh-keygen -t dsa -P "" -f /etc/ssh/ssh_host_dsa_key \
    && ssh-keygen -t ecdsa -P "" -f /etc/ssh/ssh_host_ecdsa_key \
    && ssh-keygen -t ed25519 -P "" -f /etc/ssh/ssh_host_ed25519_key \
    && chmod 600 \
        /etc/ssh/ssh_host_rsa_key \
        /etc/ssh/ssh_host_dsa_key \
        /etc/ssh/ssh_host_ecdsa_key \
        /etc/ssh/ssh_host_ed25519_key \
    && chmod 644 \
        /etc/ssh/ssh_host_rsa_key.pub \
        /etc/ssh/ssh_host_dsa_key.pub \
        /etc/ssh/ssh_host_ecdsa_key.pub \
        /etc/ssh/ssh_host_ed25519_key.pub \
    && chown root:root /var/empty \
    && chmod 711 /var/empty \
    && echo "root:admin" | chpasswd

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/usr/sbin/sshd -p 2200 # 可以指定 2200 端口，默认使用22