1、下载alpine镜像

[root@docker43 ~]# docker pull alpine
Using default tag: latest
Trying to pull repository docker.io/library/alpine ...
latest: Pulling from docker.io/library/alpine
4fe2ade4980c: Pull complete
Digest: sha256:621c2f39f8133acb8e64023a94dbdf0d5ca81896102b9e57c0dc184cadaf5528
Status: Downloaded newer image for docker.io/alpine:latest
[root@docker43 ~]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
docker.io/alpine    latest              196d12cf6ab1        3 weeks ago         4.41 MB


2、编写dockerfile


2.1.创建一个工作目录

[root@docker43 ~]# cd /opt/
[root@docker43 opt]# mkdir alpine_ssh && cd alpine_ssh && touch Dockerfile
 
[root@docker43 alpine_ssh]# ll
总用量 4
-rw-r--r-- 1 root root 654 10月  3 23:21 Dockerfile


2.2.编写Dockerfile

# 指定创建的基础镜像
FROM alpine
 
# 作者描述信息
MAINTAINER alpine_sshd (zhujingzhi@123.com)
 
# 替换阿里云的源
RUN echo "http://mirrors.aliyun.com/alpine/latest-stable/main/" > /etc/apk/repositories
RUN echo "http://mirrors.aliyun.com/alpine/latest-stable/community/" >> /etc/apk/repositories
 
# 同步时间
 
# 更新源、安装openssh 并修改配置文件和生成key 并且同步时间
RUN apk update && \
    apk add --no-cache openssh tzdata && \ 
    cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime && \
    sed -i "s/#PermitRootLogin.*/PermitRootLogin yes/g" /etc/ssh/sshd_config && \
       ssh-keygen -t dsa -P "" -f /etc/ssh/ssh_host_dsa_key && \
    ssh-keygen -t rsa -P "" -f /etc/ssh/ssh_host_rsa_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 && \
    echo "root:admin" | chpasswd
 
# 开放22端口
EXPOSE 22
 
# 执行ssh启动命令
CMD ["/usr/sbin/sshd", "-D"]


2.3.创建镜像

# 在dockerfile所在的目录下
[root@docker43 alpine_ssh]# pwd
/opt/alpine_ssh
[root@docker43 alpine_ssh]# docker build -t alpine:sshd .

作者：​sunsky303