1、下载alpine镜像
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[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
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2、编写dockerfile
2.1.创建一个工作目录
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[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
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2.2.编写Dockerfile
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# 指定创建的基础镜像
FROM alpine
# 作者描述信息
MAINTAINER alpine_sshd ([email protected])
# 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 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"
]
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2.3.创建镜像
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# 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 .
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