1.7.0版本docker安装与使用
服务器是ubuntu server 14.04，内核：3.13.0-32-generic,硬件是dell R520一、安装
方法一：
通过系统自带包安装
Ubuntu 14.04 版本系统中已经自带了 Docker 包，可以直接安装。
$ sudo apt-get update
$ sudo apt-get install -y docker.io
$ sudo ln -sf /usr/bin/docker.io /usr/local/bin/docker
$ sudo sed -i '$acomplete -F _docker docker' /etc/bash_completion.d/docker.io
方法二：
通过Docker源安装最新版本
要想安装最新版本的Docker需要使用Docker源来安装
# apt-get -y install apt-transport-https
# apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 36A1D7869245C8950F966E92D8576A8BA88D21E9
# bash -c "echo deb https://get.docker.io/ubuntu docker main > /etc/apt/sources.list.d/docker.list"
# apt-get update
# apt-get -y install lxc-docker
# docker -v //查看docker版本
# ps -ef | grep docker
root 17311 10 Feb13 ? 00:00:43 /usr/bin/docker -d
2、下载tar包并加入镜像里
一般下载镜像的时候，都是先docker search image_name，然后docker pull image_name
但由于最近GFW屏蔽了网络，在现在的时候会出现以下错误，根本pull不了镜像。
Pull ingrepository centos
2014/05/19 13:35:11 Gethttps://cdn-registry-1.docker.io/v1/repositories/library/centos/tags: read tcp162.159.253.251:443: connection timed out
所以为了解决此问题，我就从别的地方下载了打包好的tar（后边会解释然后自己打包的），然后使用docker load导入先下载（有centos与ubuntu）
wget http://docker.widuu.com/ubuntu.tar
wget http://docker.widuu.com/centos.tar
加入到镜像里
#docker load -i centos.tar
#docker load -i ubuntu.tar
查看镜像列表
#docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
<none> <none> 607347d2a946 3 months ago 300.2 MB
ubuntu/widuu latest 963b9d0e10ba 3 monthsago 155 MB
给centos的改个名
#docker tag 607 centos:latest
#docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
centos latest 607347d2a946 3 months ago 300.2 MB
ubuntu/widuu latest 963b9d0e10ba 3 monthsago 155 MB
测试镜像是否可用
#docker run centos /bin/echo "hello,i'm centos system"
hello,i'mcentos system
#docker run ubuntu/widuu /bin/echo "hello,i'm ubuntu system"
hello,i'mubuntu system
使用交换模式
#docker run -i -t centos /bin/bash
bash-4.1#ifconfig
eth0 Link encap:EthernetHWaddr BA:08:86:7F:F8:48
inet addr:172.17.0.4Bcast:0.0.0.0 Mask:255.255.0.0
inet6 addr: fe80::b808:86ff:fe7f:f848/64Scope:Link
UP BROADCAST RUNNINGMTU:1500 Metric:1
RX packets:6 errors:0 dropped:2overruns:0 frame:0
TX packets:2 errors:0 dropped:0overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:488 (488.0 b)TX bytes:168 (168.0 b)
lo Link encap:Local Loopback
inet addr:127.0.0.1Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNINGMTU:1500 Metric:1
RX packets:0 errors:0 dropped:0overruns:0 frame:0
TX packets:0 errors:0 dropped:0overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b)TX bytes:0 (0.0 b)
bash-4.1# exit
退出有2种方式，一种是完全退出，使用exit；另外一中是不完全退出，使用ctrl-p与ctrl-q
这样你不是完全退出了，但容器状态还是存在。
可用使用docker attach CONTAINER ID来重新进入。
如果你是完全退出了，docker容器状态显示Exited，需要重新启动docker容器，在使用attach进入.
docker start CONTAINER ID
docker attach CONTAINER ID
在宿主机ubuntu上面测试使用ssh进行连接docker容器
# docker run -i -t centos /bin/bash
bash-4.1#ifconfig
eth0 Link encap:EthernetHWaddr BA:08:86:7F:F8:48
inet addr:172.17.0.4Bcast:0.0.0.0 Mask:255.255.0.0
inet6 addr: fe80::b808:86ff:fe7f:f848/64Scope:Link
UP BROADCAST RUNNINGMTU:1500 Metric:1
RX packets:6 errors:0 dropped:2overruns:0 frame:0
TX packets:2 errors:0 dropped:0overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:488 (488.0 b)TX bytes:168 (168.0 b)
为docker容器里面root修改密码
bash-4.1# passwd root
New password:
/usr/share/cracklib/pw_dict.pwd: No such file or directory
PWOpen: No such file or directory
解决方法：
bash-4.1# rpm -e cracklib-dicts --nodeps
bash-4.1# rpm -e pam --nodeps
bash-4.1# yum -y install cracklib-dicts pam
bash-4.1# passwd root 就可以成功了。
bash-4.1# service sshd start
Starting sshd:
bash-4.1# netstat -ntl
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 :::22 :::* LISTEN
在docker容器上面上面进行ssh连接报下面错误
# ssh -l root 172.17.0.4
The authenticity of host '172.17.0.4 (172.17.0.4)' can't be established.
RSA key fingerprint is 9f:10:e8:9e:7c:a3:45:4e:ef:d0:19:f0:11:46:43:4e.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '172.17.0.4' (RSA) to the list of known hosts.
Permission denied (publickey,gssapi-keyex,gssapi-with-mic).
解决方法：
bash-4.1# vim /etc/ssh/sshd_config
将PermitRootLogin no改成 PermitRootLogin yes
RSAAuthentication yes
PubkeyAuthentication yes
AuthorizedKeysFile .ssh/authorized_keys
bash-4.1#service sshd restart
bash-4.1#setenforce 0
bash-4.1# ssh -l root 172.17.0.4
Last login: Fri Jun 26 07:09:47 2015 from 172.17.0.4
#
发现登录成功。
二、私有库
由于GFW，所以玩docker没办法pull与push，并且为了安全考虑，为了解决就搭建了私有库。
Docker 官方提供了 docker registry 的构建方法:https://github.com/docker/docker-registry
方法一，快速构建
快速构建 docker registry 通过以下两步:
[*] 安装 docker
[*] 运行 registry: docker run -p 5000:5000 registry
这种方法通过 Docker hub 使用官方镜像 https://registry.hub.docker.com/_/registry/
方法二，不使用容器构建registry
安装必要的软件
# apt-get install build-essential python-dev libevent-dev python-pip liblzma-dev gunicornpython-dev -y配置 docker-registry
# pip install docker-registry或者 使用 github clone 手动安装
$ git clone https://github.com/dotcloud/docker-registry.git
$ cd docker-registry/
$ cp config/config_sample.yml config/config.yml
$ mkdir /data/registry -p
$ pip install .运行
# gunicorn -k gevent --max-requests 100 --graceful-timeout 3600 -t 3600 -b localhost:5000 -w 8 -D --access-logfile /tmp/gunicorn.logdocker_registry.wsgi:application
客户端推送镜像到私有库
1、先注册账号
# docker login localhost:5000
依次输入你的账号、密码、email
2、给提交的镜像打标签
# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
504d16302ad4
jdeathe/centos-ssh "/bin/bash" About an hour ago Up 42
minutes 22/tcp serene_bardeen
# docker commit 504d16302ad4 centos:v1
b47276971c2db84bd76659da86a4ea5bda227f008c5004152232183066f20533
# docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
centos v1 b47276971c2d 7 seconds ago 376.8 MB
jdeathe/centos-ssh latest b071db8f6e23 4 weeks ago 238 MB
3、推送到私有库
# docker push localhost:5000/centos
The pushrefers to a repository (len: 1)
Sendingimage list
Pushingrepository localhost:5000/centos (1 tags)
Image384630bcda7c already pushed, skipping
Image607347d2a946 already pushed, skipping
5abf7cce3767:Image successfully pushed
Pushingtag for rev on{http://localhost:5000/v1/repositories/centos/tags/latest}
# docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
centos v1 b47276971c2d About an hour ago 376.8 MB
localhost:5000/centos latest b47276971c2d About an hour ago 376.8 MB
jdeathe/centos-ssh latest b071db8f6e23 4 weeks ago 238 MB
http://docker.widuu.com/
http://aresy.blog.51cto.com/5100031/1553624
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