通过DockerFile创建ssh服务镜像

说明：创建一个含有sshd服务的基础镜像，再在这个基础镜像中创建其它中间件镜像，再利用中间件镜像创建应用容器。通过Dockerfile可以创建任意自定义容器，配合supervisord服务完美搭配。

1. 编写Dockerfile

[root@docker1 ~]# vi /root/base_ssh/Dockerfile
-----------------DockerFile-----------------

# This is Dockerfile
# Author: koumm
# Base image docker.io/centos
FROM docker.io/centos
MAINTAINER KOUMM XXX@126.com
RUN rpm -ivh http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-9.noarch.rpm && \
yum install -y curl wget tar bzip2 unzip net-tools rsync man openssl openssl-devel && \
yum install -y gcc gcc-c++ git make automake cmake patch logrotate python-devel && \
yum -y install openssh-server passwd python-pip && \
yum clean all && \
/usr/bin/pip install supervisor
ADD supervisord.conf /etc/supervisord.conf
RUN mkdir -p /etc/supervisor.conf.d
ADD sshd.ini /etc/supervisor.d/sshd.ini
RUN echo 'QWER#123456' | passwd --stdin root
RUN ssh-keygen -q -t rsa -b 2048 -f /etc/ssh/ssh_host_rsa_key -N ''
RUN ssh-keygen -q -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N ''
RUN ssh-keygen -t dsa -f /etc/ssh/ssh_host_ed25519_key  -N ''
RUN sed -i "s/#UsePrivilegeSeparation.*/UsePrivilegeSeparation no/g" /etc/ssh/sshd_config
RUN sed -i "s/UsePAM.*/UsePAM no/g" /etc/ssh/sshd_config
EXPOSE 22
ENTRYPOINT ["/usr/bin/supervisord"]

--------------------------------------------

2. 创建supervisord.conf配置文件

#创建supervisord主配置文件,事先将再成的配置文件复制一份出来即可。

# vi /root/base_ssh/supervisord.conf
[unix_http_server]
file=/tmp/supervisor.sock   ; (the path to the socket file)
[supervisord]
logfile=/tmp/supervisord.log ; (main log file;default $CWD/supervisord.log)
logfile_maxbytes=50MB        ; (max main logfile bytes b4 rotation;default 50MB)
logfile_backups=10           ; (num of main logfile rotation backups;default 10)
loglevel=info                ; (log level;default info; others: debug,warn,trace)
pidfile=/tmp/supervisord.pid ; (supervisord pidfile;default supervisord.pid)
nodaemon=true               ; (start in foreground if true;default false)
minfds=1024                  ; (min. avail startup file descriptors;default 1024)
minprocs=200                 ; (min. avail process descriptors;default 200)
[rpcinterface:supervisor]
supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface
[supervisorctl]
serverurl=unix:///tmp/supervisor.sock ; use a unix:// URL  for a unix socket
[include]
files=/etc/supervisor.d/*.ini

# 创建sshd服务启动文件

# vi /root/base_ssh/sshd.ini[program:sshd]
command=/usr/sbin/sshd -D

3. 通过Dockerfile创建镜像

[root@docker1 ~]# docker build -t centos:ssh_v2 /root/base_ssh/
过程略..
base_ssh为准备相关资源的目录，包括Dockerfile文件的位置。
[root@docker1 ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
centos ssh_v2 71fb8b60cf9f 6 minutes ago 407.1 MB
docker.io/centos latest 8140d0c64310 2 weeks ago 192.5 MB

4. 通过镜像创建容器

[root@docker1 ~]# docker run -d -p 2223:22 --name sshtest1 centos:ssh_v2
说明: -p 2223:22 映射要机2223端口到容器22端口



然后可以通过ssh登录主机的2223端口访问容器ssh服务。