Docker practice (1)-getting started

Tutorial

Centos6.5 environment.

# Yum install docker-io-y

Will depend on the installation of libcgroup, lxc, lxc-libs

 

Start docker

# Service docker start

Starting cgconfig service: [OK]

Starting docker: [OK]

 

Get the latest docker Image

# Docker pull centos: Latest

Run Image

# Docker run-I-t centos/bin/bash

Bash-4.2 # ls

Bin Dev etc home lib lib64 lost + found media MNT opt proc root run sbin SELinux SRV sys tmp usr VaR

Bash-4.2 # exit

 

Submit update

# Docker commit-M = "add net-Tools"-A = "dbyin" ad6327a8e166 dbyin/testrep

Bytes

Delete an image

# Docker RMI dbyin/sshd

Untagged: dbyin/sshd: Latest

Deleted: 3e6ddcc38145770486dbd2fcb5b3a6734fea447ab024c540e83d34acc8113a11

Deleted: Deleted

Deleted: 4ffa765d3fafa308edba9de3e59582451d6658e4c50cf9dda-bc18bfe410d2e9

Deleted: 95cc1fd701f6961585196a0b43e06404aa81f4ec65278d2249ad0716a2cf3d87

Deleted: Deleted

 

References

[1] https://docs.docker.com/installation/centos/

[2] working with docker Images

 

Deploy SSH Through docker

# Cat dockerfile

From centos

Maintainer dbyin

Run Yum install-y openssh-Server

Run echo "root: Root" | chpasswd

Expose 22

CMD ["/usr/sbin/sshd", "-d"]

 

 

Build Image

# Docker build -- Rm-T dbyin/sshd.

Sending build context to docker daemon 74.75 KB

Sending build context to docker daemon

Step 0: From centos

---> 1a7dc42f78ba

Step 1: maintainer dbyin

---> Running in f40dd8c16027

---> Ae21b4f05d98

Removing intermediate container f40dd8c16027

Step 2: Run Yum install-y openssh-Server

---> Running in a298b82f5fc1

Loaded plugins: fastestmirror

Determining fastest mirrors

* Base: mirrors.cug.edu.cn

* Extras: mirrors.cug.edu.cn

* Updates: mirrors.cug.edu.cn

Resolving Dependencies

--> Running transaction check

---> Package openssh-server.x86_64 0: 6. 4p1-8.el7 will be installed

--> Processing dependency: OpenSSH = 6.4p1-8. el7 for package: openssh-server-6.4p1-8.el7.x86_64

--> Running transaction check

---> Package OpenSSH. x86_64 0: 6. 4p1-8.el7 will be installed

--> Finished dependency resolution

 

Dependencies resolved

 

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

Package arch version repository size

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

Installing:

Openssh-server x86_64 6.4p1-8. el7 base 367 K

Installing for dependencies:

OpenSSH x86_64 6.4p1-8. el7 base 341 K

 

Transaction Summary

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

Install 1 package (+ 1 dependent package)

 

Total download size: 708 K

Installed size: 1.8 m

Downloading packages:

Warning:/var/Cache/Yum/x86_64/7/base/packages/openssh-server-6.4p1-8.el7.x86_64.rpm: Header V3 RSA/sha256 signature, key ID f4a80eb5: nokey

Public Key for openssh-server-6.4p1-8.el7.x86_64.rpm Is Not Installed

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

Total 195 KB/S | 708 KB

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) <[email protected]>"

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

Package: centos-release-7-0.1406.el7.centos.2.3.x86_64 (@ centos/$ releasever)

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

Running transaction check

Running transaction Test

Transaction test succeeded

Running transaction

Installing: openssh-6.4p1-8.el7.x86_64 1/2

Installing: openssh-server-6.4p1-8.el7.x86_64 2/2

Verifying: openssh-server-6.4p1-8.el7.x86_64 1/2

Verifying: openssh-6.4p1-8.el7.x86_64 2/2

 

Installed:

Openssh-server.x86_64 0: 6. 4p1-8.el7

 

Dependency installed:

OpenSSH. x86_64 0: 6. 4p1-8.el7

 

Complete!

---> 95cc1fd701f6

Removing intermediate container a298b82f5fc1

Step 3: Run echo "root: Root" | chpasswd

---> Running in 0aad665d3d2a

---> 4ffa765d3faf

Removing intermediate container 0aad665d3d2a

Step 4: Expose 22

---> Running in f3e0c11abc3f

---> Ab8ed0aaabab

Removing intermediate container f3e0c11abc3f

Step 5: cmd ["/usr/sbin/sshd", "-d"]

---> Running in 41d15fb205ff

---> 3e6ddcc38145

Removing intermediate container 41d15fb205ff

Successfully built 3e6ddcc38145

 

Start Image

# Docker run-D-p -- name test_sshd dbyin/sshd

Bytes

Container 22 is mapped to port 49153 of the host.

 

Stop container

# Docker stop test_sshd

Delete container

# Docker RM test_sshd

 

Error 1

Error: cannot start container restart: Port has already been allocated

Restart the docker service, see https://github.com/dotcloud/docker/issues/6476

 

Error 2

# SSH [email protected]-P 49153-V

Openssh_5.3p1, OpenSSL 1.0.1e-FIPS 11 Feb 2013

Debug1: Reading configuration data/etc/ssh/ssh_config

Debug1: Applying options *

Debug1: connecting to 172.16.213.129 [172.16.213.129] Port 49153.

Debug1: Connection established.

Debug1: permanently_set_uid: 0/0

Debug1: Identity file/root/. Ssh/identity type-1

Debug1: Identity file/root/. Ssh/identity-Cert Type-1

Debug1: Identity file/root/. Ssh/id_rsa type-1

Debug1: Identity file/root/. Ssh/id_rsa-cert-type-1

Debug1: Identity file/root/. Ssh/id_dsa type-1

Debug1: Identity file/root/. Ssh/id_dsa-cert-type-1

Debug1: Remote Protocol Version 2.0, remote software version openssh_6.4

Debug1: Match: openssh_6.4 Pat OpenSSH *

Debug1: enabling compatibility mode for protocol 2.0

Debug1: local version string SSH-2.0-OpenSSH_5.3

Debug1: ssh2_msg_kexinit sent

Read from socket failed: Connection reset by peer

 

Add the following content to rebuild the image

Run ssh-keygen-t rsa-F/etc/ssh/ssh_host_rsa_key

Run ssh-keygen-t dsa-F/etc/ssh/ssh_host_dsa_key

 

Then

...

Debug1: Exit status 254

Add the following content to rebuild the image. Refer to here

Run sed-Ri's/usepam Yes/# usepam Yes/G'/etc/ssh/sshd_config

Run sed-Ri's/# usepam no/G'/etc/ssh/sshd_config

 

Access

# SSH [email protected]-P 49153

 

References

[1] dockerizing an SSH daemon service

[2] docker: Using Linux containers to support portable Application Deployment

YY brother
Source: http://www.cnblogs.com/hustcat/
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