一. 从docker hub 下载centos 官方镜像
hr:centos7 hr$ docker pull centos:7
下载完后，查看本地资源库：
hr:centos7 hr$ docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
centos 7 ce20c473cd8a 7 weeks ago 172.3 MB
运行容器
hr:centos7 hr$ docker run -i -t centos:7 /bin/bash
二. 安装passwd,openssl,openssh-server
[root@b5926410fe60 /]# yum install passwd openssl openssh-server -y
启动sshd:
# /usr/sbin/sshd -D
这时报以下错误：
[root@ b5926410fe60 /]# /usr/sbin/sshd
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
执行以下命令解决：
[root@b5926410fe60 /]# ssh-keygen -q -t rsa -b 2048 -f /etc/ssh/ssh_host_rsa_key -N ''
[root@b5926410fe60 /]# ssh-keygen -q -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N ''
[root@b5926410fe60 /]# ssh-keygen -t dsa -f /etc/ssh/ssh_host_ed25519_key -N ''
然后，修改 /etc/ssh/sshd_config 配置信息：
UsePAM yes 改为 UsePAM no
UsePrivilegeSeparation sandbox 改为 UsePrivilegeSeparation no
[root@b5926410fe60 /]# sed -i "s/#UsePrivilegeSeparation.*/UsePrivilegeSeparation no/g" /etc/ssh/sshd_config
[root@b5926410fe60 /]# sed -i "s/UsePAM.*/UsePAM no/g" /etc/ssh/sshd_config
修改完后，重新启动sshd
[root@b5926410fe60 /]# /usr/sbin/sshd -D
三. 修改root 密码
[root@b5926410fe60 /]# passwd root
四. 查看容器ip地址（如果宿主机是linux操作系统则跳过这一步）
[root@b5926410fe60 /]# ip addr ls eth0
84: eth0@if85: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
link/ether 02:42:ac:11:00:02 brd ff:ff:ff:ff:ff:ff
inet 172.17.0.2/16 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::42:acff:fe11:2/64 scope link
valid_lft forever preferred_lft forever
五. 将当前容器保存为镜像
hr:centos7 hr$ docker ps -all
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
b5926410fe60 centos:7 "/bin/bash" 4 minutes ago Exited (0) 4 seconds ago centos7ssh
hr:centos7 hr$ docker commit b5926410fe60 herong/centos7-ssh
六. 在宿主机上基于新创建的镜像启动新的容器
--先删除之前的容器
hr:centos7 hr$ docker ps -all
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
4122f818a741 herong/centos7-ssh:latest "/usr/sbin/sshd" 13 seconds ago Exited (0) 13 seconds ago happy_mclean
hr:centos7 hr$ docker rm -f 4122f818a741
--基于新镜像运行容器
hr:centos7 hr$ docker run -d -p 10022:22 herong/centos7-ssh:latest /usr/sbin/sshd -D
--查看映射端口是否成功
hr:centos7 hr$ docker ps -all
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
4966d35fe0a3 herong/centos7-ssh:latest "/usr/sbin/sshd -D" 3 seconds ago Up 3 seconds 0.0.0.0:10022->22/tcp compassionate_kowalevski
hr:centos7 hr$ docker port 4966d35fe0a3
22/tcp -> 0.0.0.0:10022
七. 从宿主机连接到容器
w 如果宿主机是非linux操作系统，则需要通过docker-machine ip连到容器
-- 查看docker-machine Ip地址
hr:centos7 hr$ docker-machine ip default
192.168.99.100
--通过docker-machine ip 连接到容器，输入之前设置的密码即可登录成功
hr:centos7 hr$ ssh root@192.168.99.100 -p 10022
The authenticity of host '[192.168.99.100]:10022 ([192.168.99.100]:10022)' can't be established.
ECDSA key fingerprint is SHA256:d3JNckcTVv1ASJlwv+IT/bJwlzMC4U1T/PmsKYIHMhQ.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '[192.168.99.100]:10022' (ECDSA) to the list of known hosts.
root@192.168.99.100's password:
[root@4966d35fe0a3 ~]# pwd
/root
w 如果宿主机是linux操作系统，则通过第4步查看到的ip地址连接
hr:centos7 hr$ ssh root@172.17.0.2 -p 10022
