A host with CentOS 7 and a docker image "https://hub.docker.com/_/ubuntu" were used.

last month I uninstalled docker.  To reproduce the errors,  I reinstalled docker and use the same image today.

However, unfortunately, I can not reproduce the errors. Everything works well.

I guess maybe I should run "module load mpi/openmpi-x86_64" on the host before I use docker.

I am sorry for the long delay.

thanks again.

Yours, 

zhichao.