Unable to build a docker file using docker command

General
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1

Hi
I am try to build a docker file using docker build command. Code is now given below:

FROM centos:8
# Set proxy environment variables
ENV export HTTP_PROXY=http://192.168.46.8:8080 
ENV export HTTPS_PROXY=http://192.168.46.8:8080
COPY /etc/resolv.conf /etc/resolv.conf
# Set DNS servers
#RUN echo nameserver 8.8.8.8 >> /etc/resolv.conf
#RUN echo nameserver 8.8.4.4 >> /etc/resolv.conf
RUN yum update -y
RUN yum install -y httpd
COPY index.html /var/www/html/
EXPOSE 80
#httpdserver
CMD ["/usr/sbin/httpd", "-D", "FOREGROUND"]

But I got find an error

 => ERROR [2/5] COPY /etc/resolv.conf /etc/resolv.conf 
 ERROR: failed to solve: failed to compute cache key: failed to calculate checksum of ref 37af8bf3-2769-4c5c-8f8f-a5748d9ead85::r7yqfnruqs28y4jx88q2xgq4f: "/etc/resolv.conf": not found

How to resolve issue anyone can support me. or find an attachment

2

Not sure if this is the problem, but I don’t think ENV should have export.

3

already added in environment proxy.

ENV export HTTP_PROXY=http://192.168.46.8:8080
4

Let me rephrase it: no export when using ENV

5

ENV proxy is not fact. Problem is now following:
=> ERROR [2/5] COPY /etc/resolv.conf /etc/resolv.conf

Follow attachment.

![docker1|690x139](upload://cYCfgnUZ0LktzLxg2bUPS9n7owz.png)
6

Problem is resolve.conf file could not work with Docker file.
=> ERROR [2/5] COPY /etc/resolv.conf /etc/resolv.conf

Please follow the error:

docker1
docker11355×273 28.3 KB

7

Does /etc/resolv.conf exist on your node/host?

Does it exist within container with the expected content?

8

yes, /etc/resolv.conf on your node/host

9

First of all, you shouldn’t copy resolv.conf into a container, and not even during build. That is mounted from the host for each container and it is readonly during build. Docker supports setting the DNS server a parameter.

https://docs.docker.com/network/#dns-services

There are similar parameters for the docker daemon too

10

Super Thank you. A lots of special thank you.