docker操作运行一步一步来@慕课网原创_慕课网

环境：CentOS 6.5 64位

https://registry.hub.docker.com/

https://www.gitbook.com/book/yeasy/docker_practice/details Docker —— 从入门到实践

http://yuedu.baidu.com/ebook/d817967416fc700abb68fca1?fr=aladdin&key=docker&f=read&qq-pf-to=pcqq.group Docker终极指南

http://dockerpool.com/books

此版本现在安装运行有一定的问题，建议到此链接docker初学跟我来

docker安装

# yum install docker-io 最新为1.5的版本

如果没有安源，先安装http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm

# service docker restart

# ps aux|grep docker |grep -v grep

root 2470 1.4 2.0 365780 15640 pts/0 Sl 17:17 0:00 /usr/bin/docker -d

# docker --help #查看docker的命令

# docker info

# docker version

Client version: 1.5.0

Client API version: 1.17

Go version (client): go1.3.3

Git commit (client): a8a31ef/1.5.0

OS/Arch (client): linux/amd64

Server version: 1.5.0

Server API version: 1.17

Go version (server): go1.3.3

Git commit (server): a8a31ef/1.5.0

安装一个centos容器

# docker search ubuntu #搜索ubuntu镜像

[root@manager ~]# docker search centos #搜索centos镜像

NAME DESCRIPTION STARS OFFICIAL AUTOMATED

centos The official build of CentOS. 1024 [OK]

ansible/centos7-ansible Ansible on Centos7 42 [OK]

tutum/centos Centos p_w_picpath with SSH access. For the root... 13 [OK]

blalor/centos Bare-bones base CentOS 6.5 p_w_picpath 9 [OK]

[root@manager ~]# docker pull tutum/centos #拉取一个docker镜像到本地

Pulling repository tutum/centos

8daafe0f270b: Download complete

6941bfcbbfca: Download complete

41459f052977: Download complete

fd44297e2ddb: Download complete

e22c88592c50: Download complete

ffce4358d6e4: Download complete

5f0574f254a5: Download complete

77ad887d94d4: Download complete

009a97f615dc: Download complete

1d9e8ea240cb: Download complete

1f071815e864: Download complete

Status: Downloaded newer p_w_picpath for tutum/centos:latest

[root@manager ~]# docker p_w_picpaths #查看镜像，这样就可以了

REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE

tutum/centos latest 8daafe0f270b 13 days ago 292.2 MB

下面说docker容器的运行，ssh登录进去

[root@manager ~]# docker run -it tutum/centos /bin/bash #开始运行一个docker

[root@4c7fb1a01e9a /]# ls #根目录下有个run.sh，是开启ssh服务的

bin etc lib lost+found mnt proc run sbin srv tmp var

dev home lib64 media opt root run.sh set_root_pw.sh sys usr

[root@81b5869f7934 /]# cat run.sh

#!/bin/bash

if [ "${AUTHORIZED_KEYS}" != "**None**" ]; then

echo "=> Found authorized keys"

mkdir -p /root/.ssh

chmod 700 /root/.ssh

touch /root/.ssh/authorized_keys

chmod 600 /root/.ssh/authorized_keys

IFS=$'\n'

arr=$(echo ${AUTHORIZED_KEYS} | tr "," "\n")

for x in $arr

x=$(echo $x |sed -e 's/^ *//' -e 's/ *$//')

cat /root/.ssh/authorized_keys | grep "$x" >/dev/null 2>&1

if [ $? -ne 0 ]; then

echo "=> Adding public key to /root/.ssh/authorized_keys: $x"

echo "$x" >> /root/.ssh/authorized_keys

done

if [ ! -f /.root_pw_set ]; then

/set_root_pw.sh

exec /usr/sbin/sshd -D

[root@81b5869f7934 /]# cat set_root_pw.sh

#!/bin/bash

if [ -f /.root_pw_set ]; then

echo "Root password already set!"

exit 0

PASS=${ROOT_PASS:-$(pwgen -s 12 1)}

_word=$( [ ${ROOT_PASS} ] && echo "preset" || echo "random" )

echo "=> Setting a ${_word} password to the root user"

echo "root:$PASS" | chpasswd

echo "=> Done!"

touch /.root_pw_set

echo "========================================================================"

echo "You can now connect to this CentOS container via SSH using:"

echo ""

echo " ssh -p <port> root@<host>"

echo "and enter the root password '$PASS' when prompted"

echo ""

echo "Please remember to change the above password as soon as possible!"

echo "========================================================================"

#需要对ssh配置做如下改动

[root@87d9ae33bd8b /]# sed -ri 's/UsePAM yes/#UsePAM yes/g' /etc/ssh/sshd_config

[root@87d9ae33bd8b /]# sed -ri 's/#UsePAM no/UsePAM no/g' /etc/ssh/sshd_config

#先不要退出

#这时候需要新开或复制一下这个ssh，进行下面操作：

[root@manager ~]# docker ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

87d9ae33bd8b

tutum/centos:latest "/bin/bash" About a minute ago Up About

a minute 22/tcp elegant_hodgkin

[root@manager ~]# docker commit 87d9ae33bd8b new_centos

aaf36507c751aed68eb2589136cc5ade1b6f062a18fe00733a10afa3780e5c91

[root@manager ~]# docker p_w_picpaths

REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE

new_centos latest aaf36507c751 6 seconds ago 292.2 MB

[root@manager ~]# docker run -d -p 0.0.0.0:2222:22 new_centos /run.sh

683198a36fcbb8d95cbe63d70c0daa1dc81d0bce9ebd304b731e20aef77cb0ff

[root@manager ~]# docker ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

683198a36fcb

new_centos:latest "/run.sh" 3 seconds ago Up 1

seconds 0.0.0.0:2222->22/tcp reverent_jang

[root@manager ~]# docker logs 683198a36fcb 2>&1 |grep '^and enter'

and enter the root password 'I2ihX1Fj4Aq2' when prompted

[root@manager ~]# ssh -p 2222 root@localhost

root@localhost's password: #密码即是上面写的'I2ihX1Fj4Aq2'

[root@683198a36fcb ~]# ls /

bin etc lib lost+found mnt proc run sbin srv tmp var

dev home lib64 media opt root run.sh set_root_pw.sh sys usr

为什么会有些麻烦？

原因在于如果你是Ubuntu的系统，直接就可以使用了；然而centos的系统需要在ssh配置里面把“UsePAM yes”禁用才可以ssh登录，刚开始一直卡到这里：

[root@manager ~]# ssh -p 2222 root@localhost

root@localhost's password:

Connection to localhost closed.

也可以先下载centos的镜像包，这样就不会出现问题：

# wget https://github.com/tutumcloud/tutum-centos/archive/master.zip

# unzip tutum-centos-master.zip

# cd tutum-centos-master

# docker build -t tutum/centos:centos6 centos6

#这一步是构建docker镜像，是根据Dockerfile文件执行操作指令，可以根据自己的需求修改Dockerfile

# cat centos6/Dockerfile

FROM centos:centos6

MAINTAINER Feng Honglin <hfeng@tutum.co>

RUN yum -y install openssh-server epel-release && \

yum -y install pwgen && \

rm -f /etc/ssh/ssh_host_dsa_key /etc/ssh/ssh_host_rsa_key && \

ssh-keygen -q -N "" -t dsa -f /etc/ssh/ssh_host_dsa_key && \

ssh-keygen -q -N "" -t rsa -f /etc/ssh/ssh_host_rsa_key && \

sed -i "s/#UsePrivilegeSeparation.*/UsePrivilegeSeparation no/g" /etc/ssh/sshd_config && \

sed -i "s/UsePAM.*/UsePAM no/g" /etc/ssh/sshd_config

ADD set_root_pw.sh /set_root_pw.sh #把本地脚本复制到docker里面

ADD run.sh /run.sh

RUN chmod +x /*.sh #执行命令

ENV AUTHORIZED_KEYS **None** #设置环境变量

EXPOSE 22 #对外22端口

CMD ["/run.sh"]

# docker p_w_picpaths #查看构建的docker镜像

#给docker的内存设置为最大100M，cpu使用率不超过50%，本地40000端口映射到docker的22端口

[root@manager ~]# docker run -m 100m -c 512 -d -p 40000:22 new_centos /run.sh

566d0985af12d1a8aadfc39e94cf826a053347f1bec4084ee4b81476dcf4e7d1

[root@manager ~]# docker ps #查看运行的docker CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMESe10324ba99ca

centos:centos6 "/bin/bash" 38 minutes ago Up 38

minutes elegant_lalande

docker容器安装nginx

ssh进入容器后，安装一个nginx

# yum install nginx -y

# /usr/sbin/nginx

# ps aux|grep nginx

root 154 0.0 0.2 109392 2136 ? Ss 03:28 0:00 nginx: master process /usr/sbin/nginx

nginx 155 0.0 0.3 109812 3000 ? S 03:28 0:00 nginx: worker process

到这里，大家应该就明白以后怎么继续做了，具体怎么配置docker的容器，生成自己定制的一套环境，大家各自大显身手，这篇是希望通过这些步骤明白docker具体的操作方法

tutum/centos 这个镜像也可以这么玩，先设定密码或者私钥：

# docker run -d -p 2222:22 -e ROOT_PASS='mypass' new_centos /run.sh

# docker ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

fdf9c04e3d60 new_centos:latest "/run.sh" 5 seconds ago Up 3 seconds 0.0.0.0:2222->22/tcp determined_feynman

# ssh -p 2222 root@localhost

[root@fdf9c04e3d60 ~]# cat /etc/centos-release

CentOS Linux release 7.1.1503 (Core)

tutum/centos 差点忘说了，这个版本的容器是centos 7.1

或者用私钥登录

docker run -d -p 2222:22 -e AUTHORIZED_KEYS="`cat ~/.ssh/id_rsa.pub`" new_centos /run.sh

docker的常用命令

# docker pull <镜像名:tag> #拉取一个镜像

# docker p_w_picpaths #查看p_w_picpaths

# docker run -i -t p_w_picpath_name /bin/bash #交互式进入容器

# docker ps #查看运行的docker

# docker logs <镜像名:tag> #查看容器的logs

# docker start/stop/kill <镜像名:tag>

# docker rm $(docker ps -a -q) #删除所有容器

# docker rmi $(docker p_w_picpaths | grep none | awk '{print $3}' | sort -r) #删除所有镜像

# docker build -t <镜像名> <Dockerfile路径> #构建自己的镜像

# docker cp 683198a36fcb:/run.sh . #从docker复制一个文件到当前目录

# docker save new_centos:latest > net_centos.tar #保存镜像

# docker load < net_centos.tar #载入镜像

# docker run --help #更多的命令自己查看一下，相当丰富

Commands:

attach Attach to a running container

build Build an p_w_picpath from a Dockerfile

commit Create a new p_w_picpath from a container's changes

cp Copy files/folders from a container's filesystem to the host path

create Create a new container

diff Inspect changes on a container's filesystem

events Get real time events from the server

exec Run a command in a running container

export Stream the contents of a container as a tar archive

history Show the history of an p_w_picpath

p_w_picpaths List p_w_picpaths

import Create a new filesystem p_w_picpath from the contents of a tarball

info Display system-wide information

inspect Return low-level information on a container or p_w_picpath

kill Kill a running container

load Load an p_w_picpath from a tar archive

logout Log out from a Docker registry server

logs Fetch the logs of a container

port Lookup the public-facing port that is NAT-ed to PRIVATE_PORT

pause Pause all processes within a container

ps List containers

pull Pull an p_w_picpath or a repository from a Docker registry server

push Push an p_w_picpath or a repository to a Docker registry server

rename Rename an existing container

restart Restart a running container

rm Remove one or more containers

rmi Remove one or more p_w_picpaths

run Run a command in a new container

save Save an p_w_picpath to a tar archive

search Search for an p_w_picpath on the Docker Hub

start Start a stopped container

stats Display a live stream of one or more containers' resource usage statistics

stop Stop a running container

tag Tag an p_w_picpath into a repository

top Lookup the running processes of a container

unpause Unpause a paused container

version Show the Docker version information

wait Block until a container stops, then print its exit code

Run 'docker COMMAND --help' for more information on a command

http://yeasy.gitbooks.io/docker_practice/content/appendix_command/index.html

更精彩的docker教程，在http://www.osstep.com/course/32 PHP沙盒基于docker的自动化实现