docker centos7 安装ssh具体步骤

 docker centos7 安装ssh具体步骤，这里记录下，也行能帮助到正在读文章的朋友。

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

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