# 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 image with SSH access. For the root... 13 [OK]
blalor/centos Bare-bones base CentOS 6.5 image 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 image for tutum/centos:latest
[root@manager ~]# docker images #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 $arr
do
x=$(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
fi
done
fi
if [ ! -f /.root_pw_set ]; then
/set_root_pw.sh
fi
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
fi
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 images
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
#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 images #查看images
# docker run -i -t image_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 images | 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 image from a Dockerfile
commit Create a new image 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 image
images List images
import Create a new filesystem image from the contents of a tarball
info Display system-wide information
inspect Return low-level information on a container or image
kill Kill a running container
load Load an image from a tar archive
login Register or log in to a Docker registry server
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 image or a repository from a Docker registry server
push Push an image 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 images
run Run a command in a new container
save Save an image to a tar archive
search Search for an image 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 image 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
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