1. The Dockerfile contents are as follows
Dockerfile
FROM registry-vpc.cn-beijing.aliyuncs.com/cmc/centos-nginx:2.2.20
MAINTAINER shuijingwanwq@163.com
COPY code /mcloud/www/pcs
COPY code/build_docker/c_files/ /
RUN chown -R nginx:nginx /mcloud/www/ && \
rm -rf /etc/nginx/conf.d/status.conf
2. Because the base image contains the directory: /sobey/www, and it is an empty directory that is no longer needed, and the base image cannot be upgraded for the time being, I decided to delete the folder: /sobey in the Dockerfile. As shown in Figure 1

3. Added a new line: RUN rm -rf /sobey. The Dockerfile contents are as follows. As shown in Figure 2

Dockerfile
FROM registry-vpc.cn-beijing.aliyuncs.com/cmc/centos-nginx:2.2.20
MAINTAINER shuijingwanwq@163.com
COPY code /mcloud/www/pcs
COPY code/build_docker/c_files/ /
RUN rm -rf /sobey
RUN chown -R nginx:nginx /mcloud/www/ && \
rm -rf /etc/nginx/conf.d/status.conf
4. Checked the container build output. It ran normally. As shown in Figure 3

Plaintext
Step 5/6 : RUN rm -rf /sobey
---> Running in 2bf756e0c68e
---> ff2ba07c5178
Removing intermediate container 2bf756e0c68e
5. Entered the container, the directory: /sobey no longer exists. This matches the expectation. As shown in Figure 4

