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Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
Root cause of this error message is only that DOCKER_HOST variable has not been exported to all the users.
In my case it was working fine while I was running docker commands as root user but when I tried the same commands from Jenkins, didn't work. To understand this issue in detail let me create such environment and see troubleshooting steps.

Docker Host -
[root@server106 ~]# hostname
server106.example.com

Docker Client -
[root@server109 ~]# hostname
server109.example.com

[root@server109 ~]# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
[root@server109 ~]# docker ps -a
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

Solution:-
[root@server109 ~]# echo "export DOCKER_HOST=192.168.99.100:4243" >> /etc/profile
[root@server109 ~]# echo "export DOCKER_HOST=192.168.99.100:4243" >> /etc/bash_profile
[root@server109 ~]# echo "export DOCKER_HOST=192.168.99.100:4243" >> /etc/environment
[root@server109 ~]# source /etc/profile /etc/bash_profile /etc/environment
It must fix the issue, let's check if it has been fixed.
[root@server109 ~]# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
[root@server109 ~]# sudo docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

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