Issue with docker executors in Jenkins

[Mus K]

Hi - I am facing the following issue in Jenkins ver. 2.190.2.

I have installed docker plugin and setup a docker executor thru Manage Jenkins -> Configure System

I have set the agent correctly in Jenkinsfile and the checkout and build pipeline stages are executing correctly. However, when I run tests that involve creating temporary docker containers, the pipeline fails with error "panic: : dial unix: missing address"

I tried troubleshooting this and the slave container is not able to accessdiscovered its not able to access the host docker daemon. I verified in the container settings that the following mapping is present for volumes  

/var/run/docker.sock:/var/run/docker.sock

I tried putting commands in Jenkinsfile e.g. docker images and I get 

Cannot connect to the Docker daemon at unix://127.0.0.1:2376. Is the docker daemon running?

script returned exit code 1

Surprisingly though, if I docker exec into the same running container I am able to successfully run docker commands that access the host's docker daemon. 

Only the docker commands in the Jenkinsfile are unable to access the host docker daemon. I also verified the container mounts using docker inspect and the volume mapping for docker.sock is present.  

Some information about the environment

Host - Ubuntu 18.04 (AWS EC2)

Docker CE - 19.03

Jenkins 2.190.2

Any help is appreciated as I have exhausted all my options. 

[Sai krishna reddy karri]

so first have you updated the docker host uri option within docker file under /etc/default/docker ?

that looks something like this -H tcp://127.0.0.1:2376 -H .

after adding this in the end line try restarting docker and then check