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
[[email protected] ~]# vi /root/base_ssh/Dockerfile
-----------------DockerFile-----------------
# This is Dockerfile # Author: koumm # Base image docker.io/centos FROM docker.io/centos MAINTAINER KOUMM [email protected] 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"]
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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
[[email protected] ~]# 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。
[[email protected] ~]# 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
[[email protected] ~]# 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。