java装文件的容器_在docker容器中安装Java（从宿主机向docker容器中拷贝文件）

左手的ㄟ右手 2022-11-08 14:29 202阅读 0赞

操作系统

\[\[email protected\] /\]\# uname -a

Linux Optimus 2.6.32-504.el6.x86\_64 \#1 SMP Wed Oct 15 04:27:16 UTC 2014 x86\_64 x86\_64 x86\_64 GNU/Linux

\[\[email protected\] /\]\# cat /etc/issue

CentOS release 6.6 (Final)

Kernel \\r on an \\m

docker版本

\[\[email protected\] /\]\# docker version

Client version: 1.7.1

Client API version: 1.19

Go version (client): go1.4.2

Git commit (client): 786b29d/1.7.1

OS/Arch (client): Linux/amd64

Server version: 1.7.1

Server API version: 1.19

Go version (server): go1.4.2

Git commit (server): 786b29d/1.7.1

OS/Arch (server): Linux/amd64

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

fc289f421957 insaneworks/centos "/bin/bash" 47 hours ago Up 47 hours master

下载java7的rpm包

![5819e35b3568fe04aa281d06aa36bf0b.png][]

选择的是jdk-7u75-Linux-x64.rpm

放到宿主机的/usr/java/目录下

\[\[email protected\] /\]\# cd /usr/java

\[\[email protected\] java\]\# ls

jdk-7u75-Linux-x64.rpm

从宿主机向Docker容器中拷贝数据

1) 失败的拷贝方式

从Docker容器中向主机拷贝文件 docker cp containerID:container\_path host\_path

从主机复制到容器docker cp host\_path containerID:container\_path

我尝试用以上方式传送文件至Docker容器中时会报错

\[\[email protected\] java\]\# docker cp jdk-7u75-Linux-x64.rpm master:/mnt/

Error: Path not specified

报错提示一直都是Error: Path not specified。

2) 正确的拷贝方式

从主机向Docker容器中拷贝数据时，其实采用的是一种通道的方式。

首先，要用docker inspect方法获得容器的完整ID

\[\[email protected\] java\]\# docker inspect -f '\{ \{.Id\}\}' master

fc289f421957df7d03146ab54030aa648ec78118d00d3063cdeb8966b6c223f4

这里的master可以是container name也可以是短的container ID。返回的fc289f421957df7d03146ab54030aa648ec78118d00d3063cdeb8966b6c223f4是完整的容器ID。

然后，使用通道拷贝数据

\[\[email protected\] java\]\# cp /usr/java/jdk-7u75-Linux-x64.rpm /var/lib/docker/aufs/mnt/fc289f421957df7d03146ab54030aa648ec78118d00d3063cdeb8966b6c223f4/root/

cp: cannot create regular file \`/var/lib/docker/aufs/mnt/fc289f421957df7d03146ab54030aa648ec78118d00d3063cdeb8966b6c223f4/root/': No such file or directory

报错No such file or directory

进入到/var/lib/docker/目录下，确实没有/aufs这个目录。

\[\[email protected\] /\]\# cd /var/lib/docker

\[\[email protected\] docker\]\# ls

containers devicemapper graph init linkgraph.db repositories-devicemapper tmp trust vfs volumes

在Docker容器中可以看到有以下目录

\[\[email protected\] containers\]\# docker exec -it master /bin/bash

\[\[email protected\] /\]\# ls

bin boot dev etc home lib lib64 media mnt opt proc root sbin seLinux srv sys tmp usr var

查找一下Docker容器相关的目录,fc289f421957df7d03146是容器的ID号。

\[\[email protected\] containers\]\# find / -name fc289f421957df7d03146ab54030aa648ec78118d00d3063cdeb8966b6c223f4

/var/run/docker/execdriver/native/fc289f421957df7d03146ab54030aa648ec78118d00d3063cdeb8966b6c223f4

/var/lib/docker/devicemapper/metadata/fc289f421957df7d03146ab54030aa648ec78118d00d3063cdeb8966b6c223f4

/var/lib/docker/devicemapper/mnt/fc289f421957df7d03146ab54030aa648ec78118d00d3063cdeb8966b6c223f4

...

发现目录/var/lib/docker/devicemapper/mnt/fc289f421957df7d03146ab54030aa648ec78118d00d3063cdeb8966b6c223f4 。

因此，在docker中，其实是映射到/var/lib/docker/devicemapper/mnt/fc289f421957df7d03146ab54030aa648ec78118d00d3063cdeb8966b6c223f4/这个文件夹中的。这个文件下面就是docker中的根目录里面的内容，然后我们就可以按照我们想要的内容随便进行拷贝。

开始拷贝。拷贝到master容器中的mnt目录下。(为什么要加/rootfs/这个目录我也不记得什么鬼了。)

\[\[email protected\] /\]\# cp /usr/java/jdk-7u75-Linux-x64.rpm /var/lib/docker/devicemapper/mnt/fc289f421957df7d03146ab54030aa648ec78118d00d3063cdeb8966b6c223f4/rootfs/mnt

进入容器，查看文件。宿主机向Docker容器拷贝数据成功。

\[\[email protected\] /\]\# docker exec -it master /bin/bash

\[\[email protected\] /\]\# ls

bin boot dev etc home lib lib64 media mnt opt proc root sbin seLinux srv sys tmp usr var

\[\[email protected\] /\]\# cd mnt

\[\[email protected\] mnt\]\# ls

jdk-7u75-Linux-x64.rpm

安装java

添加可执行权限。

\[\[email protected\] mnt\]\# chmod +x jdk-7u75-Linux-x64.rpm

\[\[email protected\] mnt\]\# ls

jdk-7u75-Linux-x64.rpm