背景说明
今天在通过dockerfile将文件夹拷贝到镜像的时候发现，是把文件夹下的内容拷贝进去了
dockerfile如下
from xxxxx:81/xxxxxx/datafusion:20201208184148
run rm -rf /usr/local/tomcat/webapps/datafusion/WEB-INF/classes/static
copy static /usr/local/tomcat/webapps/datafusion/WEB-INF/classes/
注意：构建完镜像，运行之后发现是把本地static目录下的内容拷贝到classes目录下了，本意是要将static拷贝到classes下成为classes/static
docker运行结果如下：
[091a0c9e4523 root:/usr/local/tomcat/webapps/datafusion/WEB-INF/classes]# ls -ltr
total 24
drwxr-xr-x 3 root root 36 Dec 8 18:41 templates
-rw-r--r-- 1 root root 2710 Dec 8 18:41 sdk.properties
drwxr-xr-x 2 root root 34 Dec 8 18:41 properties
-rw-r--r-- 1 root root 179 Dec 8 18:41 oss.properties
-rw-r--r-- 1 root root 2888 Dec 8 18:41 logback-spring.xml
-rw-r--r-- 1 root root 200 Dec 8 18:41 intellit.properties
drwxr-xr-x 2 root root 96 Dec 8 18:41 i18n
drwxr-xr-x 2 root root 24 Dec 8 18:41 db
drwxr-xr-x 4 root root 223 Dec 8 18:41 config
drwxr-xr-x 3 root root 20 Dec 8 18:41 com
-rw-r--r-- 1 root root 1501 Dec 8 18:41 banner.txt
-rw-r--r-- 1 root root 465 Dec 8 18:41 application.properties
drwxr-xr-x 2 root root 48 Dec 8 18:41 META-INF
drwxr-xr-x 5 root root 59 Dec 9 09:02 datafusion
[091a0c9e4523 root:/usr/local/tomcat/webapps/datafusion/WEB-INF/classes]# #并没有把static目录拷贝进来
实现方法
copy时指定镜像中的目录
dockerfile修改如下
from xxxxx:81/xxxxxx/datafusion:20201208184148
run rm -rf /usr/local/tomcat/webapps/datafusion/WEB-INF/classes/static
copy static /usr/local/tomcat/webapps/datafusion/WEB-INF/classes/static #加上镜像内的static目录，虽然镜像中的目录已经被删除
构建，运行新的镜像
[ec5dbacdec93 root:/usr/local/tomcat/webapps/datafusion/WEB-INF/classes]# ls -ltr
total 24
drwxr-xr-x 3 root root 36 Dec 8 18:41 templates
-rw-r--r-- 1 root root 2710 Dec 8 18:41 sdk.properties
drwxr-xr-x 2 root root 34 Dec 8 18:41 properties
-rw-r--r-- 1 root root 179 Dec 8 18:41 oss.properties
-rw-r--r-- 1 root root 2888 Dec 8 18:41 logback-spring.xml
-rw-r--r-- 1 root root 200 Dec 8 18:41 intellit.properties
drwxr-xr-x 2 root root 96 Dec 8 18:41 i18n
drwxr-xr-x 2 root root 24 Dec 8 18:41 db
drwxr-xr-x 4 root root 223 Dec 8 18:41 config
drwxr-xr-x 3 root root 20 Dec 8 18:41 com
-rw-r--r-- 1 root root 1501 Dec 8 18:41 banner.txt
-rw-r--r-- 1 root root 465 Dec 8 18:41 application.properties
drwxr-xr-x 2 root root 48 Dec 8 18:41 META-INF
drwxr-xr-x 3 root root 24 Dec 9 13:00 static #已经成功把static目录拷贝进来了，进入到镜像中也是static这个目录，而不是把目录中的内容拷贝进来
[ec5dbacdec93 root:/usr/local/tomcat/webapps/datafusion/WEB-INF/classes]#
通过add命令,指定镜像中的目录
dockerfile如下
from 172.20.59.71:81/c87e2267-1001-4c70-bb2a-ab41f3b81aa3/datafusion:20201208184148
run rm -rf /usr/local/tomcat/webapps/datafusion/WEB-INF/classes/static
add static /usr/local/tomcat/webapps/datafusion/WEB-INF/classes/static
运行结果：
[fb235c3c32af root:/usr/local/tomcat/webapps/datafusion/WEB-INF/classes]# ls -ltr
total 24
drwxr-xr-x 3 root root 36 Dec 8 18:41 templates
-rw-r--r-- 1 root root 2710 Dec 8 18:41 sdk.properties
drwxr-xr-x 2 root root 34 Dec 8 18:41 properties
-rw-r--r-- 1 root root 179 Dec 8 18:41 oss.properties
-rw-r--r-- 1 root root 2888 Dec 8 18:41 logback-spring.xml
-rw-r--r-- 1 root root 200 Dec 8 18:41 intellit.properties
drwxr-xr-x 2 root root 96 Dec 8 18:41 i18n
drwxr-xr-x 2 root root 24 Dec 8 18:41 db
drwxr-xr-x 4 root root 223 Dec 8 18:41 config
drwxr-xr-x 3 root root 20 Dec 8 18:41 com
-rw-r--r-- 1 root root 1501 Dec 8 18:41 banner.txt
-rw-r--r-- 1 root root 465 Dec 8 18:41 application.properties
drwxr-xr-x 2 root root 48 Dec 8 18:41 META-INF
drwxr-xr-x 3 root root 24 Dec 9 13:03 static #static目录已经被拷贝进来了。
[fb235c3c32af root:/usr/local/tomcat/webapps/datafusion/WEB-INF/classes]#