Jenkins user using docker (inside docker container) -

i have dockerfile:

from jenkins:1.651.1 copy plugins.txt /usr/share/jenkins/plugins.txt run /usr/local/bin/plugins.sh /usr/share/jenkins/plugins.txt user root run groupadd docker run usermod -a -g docker jenkins user jenkins 

i add user jenkins group docker. when access container:

jenkins@bc145b8cfc1d:/$ docker ps cannot connect docker daemon. docker daemon running on host? jenkins@bc145b8cfc1d:/$ whoami jenkins 

this content of /etc/groupon container

jenkins:x:1000: docker:x:1001:jenkins 

my jenkins user in docker group

jenkins@bc145b8cfc1d:/$ groups jenkins jenkins : jenkins docker 

what doing wrong? want use docker-commands jenkins user. i'm on amazon ec2 container service.

this how start container image:

docker run -d -v /var/run/docker.sock:/var/run/docker.sock -v /usr/bin/docker:/usr/bin/docker:ro -v /lib64/libdevmapper.so.1.02:/usr/lib/x86_64-linux-gnu/libdevmapper.so.1.02 -v /lib64/libudev.so.0:/usr/lib/x86_64-linux-gnu/libudev.so.0 -p 8080:8080 --name jenkins -u jenkins --privileged=true -t -i my-jenkins:1.0 

this 'solution' worked on ubuntu (not on centos). dockerfile

from jenkins:1.651.1 user root run apt-get update \   && apt-get install -y apt-transport-https ca-certificates \   && echo "deb https://apt.dockerproject.org/repo debian-jessie main" > /etc/apt/sources.list.d/docker.list \   && apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118e89f3a912897c070adbf76221572c52609d \   && apt-get update -y \   && apt-get install -y docker-engine run gpasswd -a jenkins docker user jenkins 

run command:

docker run -d -it -v /var/run/docker.sock:/var/run/docker.sock test-jenkins 

on ubuntu:

jenkins@c73c683b02d7:/$ whoami jenkins jenkins@c73c683b02d7:/$ docker ps container id        image               command                  created             status              ports                                              names c73c683b02d7        test-jenkins        "/bin/tini -- /usr/lo"   2 minutes ago       2 minutes        8080/tcp, 50000/tcp                              condescending_wing 

it has gid think: cat /etc/group in container (on ubuntu , centos).

jenkins:x:1000: docker:x:999:jenkins 

cat /etc/group on ubuntu (also 999)

docker:x:999:ubuntu 

cat /etc/group on centos (different gid)

docker:x:983:centos 

there solution this. needed ubuntu did not go further in this.