[Original] Solve CentOS7 container Failed to get D-Bus connection: Operation not permitted

Solution:

First start a CentOS7 container in the background (be careful not to reduce parameters):

docker run -d -e "container=docker" --privileged=true -v /sys/fs/cgroup:/sys/fs/cgroup --name centos7 centos /usr/sbin/init

Then enter the container again:

docker exec -it ab49ca003950 /bin/bash