ping to google not working after upgrade host machine ubuntu 18.04 to 18.10

my docker file

FROM golang:1.9
WORKDIR /go/src/github.com/sohag1990/gingorm-master
COPY . .

docker build command

docker build -t whoshakhawat/go-app .
build success

running container using /bin/bash

docker run -it whoshakhawat/go-app /bin/bash

ping command inside docker container

root@62ba0502a1c6:/# ping google.com
ping: google.com: Temporary failure in name resolution
root@62ba0502a1c6:/# ping github.com
ping: github.com: Temporary failure in name resolution

Everything was fine when it was in Ubuntu-18.04. Thanks:)

I got the solution that may be helpful for someone else.

Accessing running container through /bin/bash

docker run --network=host -it whoshakhawat/go-app /bin/bash

The --network=host takes out any network isolation between the docker host and the docker containers.

Now ping command inside the docker container is working fine.

root@62ba0502a1c6:/# ping github.com
PING github.com (192.30.255.112) 56(84) bytes of data.
64 bytes from lb-192-30-255-112-sea.github.com (192.30.255.112): icmp_seq=1 ttl=47 time=259 ms

Here Docker container and Host machine both are aligned in the same network. Read Documentation here https://docs.docker.com/network/host/