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-server 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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3、创建容器测试
创建容器
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[root@docker43 alpine_ssh]
# docker run -itd -p 10022:22 --name alpine_ssh_v1 alpine:sshd
[root@docker43 alpine_ssh]
# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
b353f5f3b703 alpine:sshd
"/usr/sbin/sshd -D"
17 minutes ago Up 17 minutes 0.0.0.0:10022->22
/tcp
alpine_ssh_v1
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测试
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[root@docker43 alpine_ssh]
# ssh [email protected] -p10022
[email protected]'s password:
Welcome to Alpine!
The Alpine Wiki contains a large amount of how-to guides and general
information about administrating Alpine systems.
See <http:
//wiki
.alpinelinux.org>.
You can setup the system with the
command
: setup-alpine
You may change this message by editing
/etc/motd
.
b353f5f3b703:~
#
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4、问题总结
这些都是我在手动测试的时候遇见的，已经在写Dockerfile的时候加进去了处理方法
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1. apk add --no-cache openssh-server
# 安装openssh的问题
/
# apk add --no-cache openssh-server
fetch http:
//dl-cdn
.alpinelinux.org
/alpine/v3
.8
/main/x86_64/APKINDEX
.
tar
.gz
fetch http:
//dl-cdn
.alpinelinux.org
/alpine/v3
.8
/community/x86_64/APKINDEX
.
tar
.gz
(1
/3
) Installing openssh-keygen (7.7_p1-r2)
ERROR: openssh-keygen-7.7_p1-r2: package mentioned
in
index not found (try
'apk update'
)
(2
/3
) Installing openssh-server-common (7.7_p1-r2)
(3
/3
) Installing openssh-server (7.7_p1-r2)
ERROR: openssh-server-7.7_p1-r2: package mentioned
in
index not found (try
'apk update'
)
2 errors; 4 MiB
in
14 packages
原因是：提示源没有这个openssh的包
解决方式：
在dockerfile中改为国内的源
http:
//mirrors
.aliyun.com
/alpine/latest-stable/main/
http:
//mirrors
.aliyun.com
/alpine/latest-stable/community/
创建容器文件修改
[root@docker43 ~]
# docker run -it alpine
/
# vi /etc/apk/repositories
http:
//mirrors
.aliyun.com
/alpine/latest-stable/main/
http:
//mirrors
.aliyun.com
/alpine/latest-stable/community/
#http://dl-cdn.alpinelinux.org/alpine/v3.8/main
#http://dl-cdn.alpinelinux.org/alpine/v3.8/community
# 注释或者删除原来的默认源，添加阿里云的源，然后执行apk update，在进行安装就OK了
2、
ssh
启动问题
/
# /etc/init.d/sshd start
/bin/sh
:
/etc/init
.d
/sshd
: not found
这样的方式不能启动，需要安装一个alpine的管理工具
apk add --no-cache openrc
/
# /etc/init.d/sshd start
* WARNING: sshd is already starting
所以使用
/usr/sbin/sshd
-D 方式启动。但是又出现如下错误
/
# /usr/sbin/sshd -D
Could not load host key:
/etc/ssh/ssh_host_rsa_key
Could not load host key:
/etc/ssh/ssh_host_ecdsa_key
Could not load host key:
/etc/ssh/ssh_host_ed25519_key
sshd: no hostkeys available -- exiting.
解决方式：
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
再次启动
/
# /usr/sbin/sshd -D
启动成功
3、创建容器后的网络问题
[root@docker43 opt]
# docker run -it alpine
WARNING: IPv4 forwarding is disabled. Networking will not work.
解决方式：
[root@docker43 ~]
# vim /etc/sysctl.conf
net.ipv4.ip_forward=1
# 添加这一行
[root@docker43 ~]
# docker run -it alpine
/
#
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