用commit方式構建具有sshd服務的centos鏡像

1.從遠程倉庫中pull centos鏡像

docker pull centos

2.查詢鏡像docker images

[root@HA2 kehj]# docker images

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE

nginx-docker        v1                  20c4d11561d3        11 hours ago        451.1 MB

docker.io/nginx     latest              f895b3fb9e30        2 weeks ago         108.5 MB

docker.io/centos    latest              3fa822599e10        3 weeks ago         203.5 MB

docker.io/ubuntu    latest              747cb2d60bbe        11 weeks ago        122 MB

3.啟動centos容器 docker run -i -t centos /bin/bash

[root@HA2 kehj]# docker run -i -t centos /bin/bash

[root@f2595a1c0aae /]#

4.安裝sshd服務

[root@f2595a1c0aae /]# yum install passwd openssl openssh-server -y

Loaded plugins: fastestmirror, ovl

base                                                                                         | 3.6 kB  00:00:00

extras                                                                                       | 3.4 kB  00:00:00

updates                                                                                      | 3.4 kB  00:00:00

(1/4): extras/7/x86_64/primary_db                                                            | 145 kB  00:00:01

(2/4): base/7/x86_64/group_gz                                                                | 156 kB  00:00:01

(3/4): updates/7/x86_64/primary_db                                                           | 4.6 MB  00:00:15

(4/4): base/7/x86_64/primary_db                                                              | 5.7 MB  00:00:23

Determining fastest mirrors

* base: mirrors.163.com

* extras: mirrors.163.com

* updates: mirrors.163.com

Package passwd-0.79-4.el7.x86_64 already installed and latest version

Resolving Dependencies

--> Running transaction check

---> Package openssh-server.x86_64 0:7.4p1-13.el7_4 will be installed

--> Processing Dependency: openssh = 7.4p1-13.el7_4 for package: openssh-server-7.4p1-13.el7_4.x86_64

--> Processing Dependency: fipscheck-lib(x86-64) >= 1.3.0 for package: openssh-server-7.4p1-13.el7_4.x86_64

--> Processing Dependency: libwrap.so.0()(64bit) for package: openssh-server-7.4p1-13.el7_4.x86_64

--> Processing Dependency: libfipscheck.so.1()(64bit) for package: openssh-server-7.4p1-13.el7_4.x86_64

---> Package openssl.x86_64 1:1.0.2k-8.el7 will be installed

--> Processing Dependency: make for package: 1:openssl-1.0.2k-8.el7.x86_64

--> Running transaction check

---> Package fipscheck-lib.x86_64 0:1.4.1-6.el7 will be installed

--> Processing Dependency: /usr/bin/fipscheck for package: fipscheck-lib-1.4.1-6.el7.x86_64

---> Package make.x86_64 1:3.82-23.el7 will be installed

---> Package openssh.x86_64 0:7.4p1-13.el7_4 will be installed

---> Package tcp_wrappers-libs.x86_64 0:7.6-77.el7 will be installed

--> Running transaction check

---> Package fipscheck.x86_64 0:1.4.1-6.el7 will be installed

--> Finished Dependency Resolution

Dependencies Resolved

====================================================================================================================

Package                          Arch                  Version                        Repository              Size

====================================================================================================================

Installing:

openssh-server                   x86_64                7.4p1-13.el7_4                 updates                458 k

openssl                          x86_64                1:1.0.2k-8.el7                 base                   492 k

Installing for dependencies:

fipscheck                        x86_64                1.4.1-6.el7                    base                    21 k

fipscheck-lib                    x86_64                1.4.1-6.el7                    base                    11 k

make                             x86_64                1:3.82-23.el7                  base                   420 k

openssh                          x86_64                7.4p1-13.el7_4                 updates                509 k

tcp_wrappers-libs                x86_64                7.6-77.el7                     base                    66 k

Transaction Summary

====================================================================================================================

Install  2 Packages (+5 Dependent packages)

Total download size: 1.9 M

Installed size: 4.9 M

Downloading packages:

warning: /var/cache/yum/x86_64/7/base/packages/fipscheck-lib-1.4.1-6.el7.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY

Public key for fipscheck-lib-1.4.1-6.el7.x86_64.rpm is not installed

(1/7): fipscheck-lib-1.4.1-6.el7.x86_64.rpm                                                  |  11 kB  00:00:00

(2/7): fipscheck-1.4.1-6.el7.x86_64.rpm                                                      |  21 kB  00:00:00

Public key for openssh-7.4p1-13.el7_4.x86_64.rpm is not installed                 ] 206 kB/s | 681 kB  00:00:06 ETA

(3/7): openssh-7.4p1-13.el7_4.x86_64.rpm                                                     | 509 kB  00:00:01

(4/7): tcp_wrappers-libs-7.6-77.el7.x86_64.rpm                                               |  66 kB  00:00:01

(5/7): openssl-1.0.2k-8.el7.x86_64.rpm                                                       | 492 kB  00:00:02

(6/7): openssh-server-7.4p1-13.el7_4.x86_64.rpm                                              | 458 kB  00:00:03

(7/7): make-3.82-23.el7.x86_64.rpm                                                           | 420 kB  00:00:04

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

Total                                                                               403 kB/s | 1.9 MB  00:00:04

Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

Importing GPG key 0xF4A80EB5:

Userid     : "CentOS-7 Key (CentOS 7 Official Signing Key) <security@centos.org>"

Fingerprint: 6341 ab27 53d7 8a78 a7c2 7bb1 24c6 a8a7 f4a8 0eb5

Package    : centos-release-7-4.1708.el7.centos.x86_64 (@CentOS)

From       : /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

Running transaction check

Running transaction test

Transaction test succeeded

Running transaction

Installing : fipscheck-1.4.1-6.el7.x86_64                                                                     1/7

Installing : fipscheck-lib-1.4.1-6.el7.x86_64                                                                 2/7

Installing : openssh-7.4p1-13.el7_4.x86_64                                                                    3/7

Installing : 1:make-3.82-23.el7.x86_64                                                                        4/7

Installing : tcp_wrappers-libs-7.6-77.el7.x86_64                                                              5/7

Installing : openssh-server-7.4p1-13.el7_4.x86_64                                                             6/7

Installing : 1:openssl-1.0.2k-8.el7.x86_64                                                                    7/7

Verifying  : fipscheck-lib-1.4.1-6.el7.x86_64                                                                 1/7

Verifying  : 1:openssl-1.0.2k-8.el7.x86_64                                                                    2/7

Verifying  : tcp_wrappers-libs-7.6-77.el7.x86_64                                                              3/7

Verifying  : fipscheck-1.4.1-6.el7.x86_64                                                                     4/7

Verifying  : openssh-7.4p1-13.el7_4.x86_64                                                                    5/7

Verifying  : openssh-server-7.4p1-13.el7_4.x86_64                                                             6/7

Verifying  : 1:make-3.82-23.el7.x86_64

Installed:

openssh-server.x86_64 0:7.4p1-13.el7_4                                                                      openssl

Dependency Installed:

fipscheck.x86_64 0:1.4.1-6.el7          fipscheck-lib.x86_64 0:1.4.1-6.el7          make.x86_64 1:3.82-23.el7

Complete!

5.執行 /usr/sbin/sshd -D,報錯：

[root@f2595a1c0aae /]# /usr/sbin/sshd -D

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

sshd: no hostkeys available -- exiting.

6.執行以下三條命令：

ssh-keygen -q -t rsa -b 2048 -f /etc/ssh/ssh_host_rsa_key -N ''

ssh-keygen -q -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N ''

ssh-keygen -t dsa -f /etc/ssh/ssh_host_ed25519_key  -N ''

[root@f2595a1c0aae /]# ssh-keygen -q -t rsa -b 2048 -f /etc/ssh/ssh_host_rsa_key -N ''

[root@f2595a1c0aae /]# ssh-keygen -q -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N ''

[root@f2595a1c0aae /]# ssh-keygen -t dsa -f /etc/ssh/ssh_host_ed25519_key  -N ''

Generating public/private dsa key pair.

Your identification has been saved in /etc/ssh/ssh_host_ed25519_key.

Your public key has been saved in /etc/ssh/ssh_host_ed25519_key.pub.

The key fingerprint is:

SHA256:U9G/RvoqxZtn/9oTzTwba8t8b3P2KoTYQ7nbC9aD7M4 root@f2595a1c0aae

The key's randomart image is:

+---[DSA 1024]----+

|          ..     |

|           ..    |

|          .. .   |

|         .o   o  |

|        S+ + o +.|

|        .o=o= o++|

|          =*o=  *|

|         +o.=.*B=|

|         .E.o*+X/|

+----[SHA256]-----+

7.vi /etc/ssh/sshd_config 修改配置文件

UsePAM yes 修改為 UsePAM no 

UsePrivilegeSeparation sandbox 修改改為 UsePrivilegeSeparation no

8.修改密碼passwd root

[root@f2595a1c0aae /]# passwd root

Changing password for user root.

New password:

BAD PASSWORD: The password is shorter than 8 characters

Retype new password:

passwd: all authentication tokens updated successfully.

9.exit退出容器

10.執行提交命令，生成鏡像 docker commit -m "add sshd" -a "kehaojian" f2595a1c0aae  sshd_centos

[root@HA2 kehj]# docker commit -m "add sshd" -a "kehaojian" f2595a1c0aae  sshd_centos

sha256:0ece1cad37782006b4175fb6f7268aac206d8729b6a844eabdd×××40e904f9a

11.執行docker images

[root@HA2 kehj]# docker images

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE

sshd_centos         latest              0ece1cad3778        8 seconds ago       293.3 MB

nginx-docker        v1                  20c4d11561d3        11 hours ago        451.1 MB

docker.io/nginx     latest              f895b3fb9e30        2 weeks ago         108.5 MB

docker.io/centos    latest              3fa822599e10        3 weeks ago         203.5 MB

docker.io/ubuntu    latest              747cb2d60bbe        11 weeks ago        122 MB

12.測試

[kehj@HA2 ~]$ ssh root@localhost -p 10022

The authenticity of host '[localhost]:10022 ([::1]:10022)' can't be established.

ECDSA key fingerprint is SHA256:wFHqfr8EPuT5cUla5cllCBf0HQ5GnTmZruj0LQI8VRg.

ECDSA key fingerprint is MD5:74:6a:da:84:64:35:50:78:c8:9a:38:de:45:f3:71:16.

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

Warning: Permanently added '[localhost]:10022' (ECDSA) to the list of known hosts.

root@localhost's password:

[root@e14d9841c1e6 ~]#