创建可以ssh的docker容器[通俗易懂]

大家好，又见面了，我是全栈君。

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操作系统：vm centos6.5 x64 192.168.240.148

docker容器：centos6.5 x64 172.17.0.3

1.下载原始镜像

1 2	`[root@localhost ~]#docker pull centos` `###一般会拉最新版centos7和centos6.5过来，这里使用的是centos6.5###`

2.安装openssh

[root@localhost ~]# docker run -i -t kw1073/centos-new4 /bin/bash

bash-4.1#yum -y install openssh-server openssh-clients

bash-4.1#chkconfig sshd on

bash-4.1#service sshd start

######显示如下#####

Generating SSH1 RSA host key: [ OK ]

Generating SSH2 RSA host key: [ OK ]

Generating SSH2 DSA host key: [ OK ]

Starting sshd: [ OK ]

3.ssh到宿主机中

bash-4.1#ssh 192.168.240.148 -p61618

root@192.168.240.148's password:

Last login: Thu Jul 31 22:39:38 2014 from 192.168.240.1

[root@localhost ~]#

4.安装passwd

bash-4.1#yum install passwd

###docker官网上的centos6.5原始镜像中没有passwd，用于修改root用户的密码###

bash-4.1#passwd root

bash-4.1#useradd kw1073

5.使用commit命令保存镜像

1	`[root@localhost ~]#docker ps -l ###查看docker的id###`

1 2	`[root@localhost ~]#docker commit 6b84dba2a9bb kw1073/centos-new4` `###做成可ssh的docker镜像###`

6.在宿主机上映射端口

1 2	`[root@localhost ~]#docker run -u -t -p 127.0.0.1:222:22 kw1073/centos-new4 /bin/bash` `###做好docker镜像和宿主机的端口映射，这里会直接进入bash环境###`

7.在docker容器中启动ssh服务

1 2	`bash-4.1#service sshd start` `bash-4.1#ifconfig`

eth0 Link encap:Ethernet HWaddr 82:E2:4F:F5:12:E9

inet addr:172.17.0.3 Bcast:0.0.0.0 Mask:255.255.0.0

inet6 addr: fe80::80e2:4fff:fef5:12e9/64 Scope:Link

UP BROADCAST RUNNING MTU:1500 Metric:1

RX packets:4882 errors:0 dropped:0 overruns:0 frame:0

TX packets:4107 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:27592541 (26.3 MiB) TX bytes:342979 (334.9 KiB)

8.在宿主机上进行ssh连接

[root@localhost ~]#ssh 172.0.0.3

The authenticity of host '172.17.0.3 (172.17.0.3)' can't be established.

RSA key fingerprint is 40:4f:f2:9a:55:07:9e:a0:cb:42:60:4f:92:fa:90:e7.

Are you sure you want to continue connecting (yes/no)? yes

Warning: Permanently added '172.17.0.3' (RSA) to the list of known hosts.

root@172.17.0.3's password:

Last login: Thu Jul 31 10:26:24 2014 from 172.17.42.1

Connection to 172.17.0.3 closed.

9.修改容器中ssh的配置

####从上一步可以看到，ssh连接错误，可以登录，但是一登录上去就马上断开####

bash-4.1# sed -i 's/UsePAM yes/UsePAM no/' /etc/ssh/sshd_config 　　#修改sshd配置文件

bash-4.1# /etc/init.d/sshd reload　

bash-4.1# /etc/init.d/sshd restart　　　　　　　　　　　　　　　　　　　　#重启sshd服务

Stopping sshd: [ OK ]

Starting sshd: [ OK ]

10.在宿主机上重试一次ssh连接

[root@localhost dist]# ssh 172.17.0.3

root@172.17.0.3's password: Last login: Thu Jul 31 11:48:51 2014 from 172.17.42.1

-bash-4.1# ls

或者如下连接：

[root@localhost dist]# ssh root@127.0.0.1 -p222

root@127.0.0.1's password: Last login: Thu Jul 31 15:36:56 2014 from 172.17.42.1

#####因为做了端口映射，所以可以直接从映射的端口登陆###

11.设置docker容器中的环境变量

#######直接从宿主机上拷贝一份过去########

[root@localhost dist]# scp /root/.bash* 172.17.0.3:/root/

12.在宿主机上重新ssh到容器中

1 2	`[root@localhost dist]# ssh 172.17.0.3 root@172.17.0.3's password: Last login: Thu Jul 31 15:07:00 2014 from 172.17.42.1` `[root@89741e6f8e61 ~]#`