# uname -a
Linux localhost.localdomain 4.18.0-80.el8.x86_64 #1 SMP Tue Jun 4 09:19:46 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
# rpm -q centos-release
# docker version
Client: Docker Engine - Community
API version: 1.39 (downgraded from 1.40)
Go version: go1.12.10
Git commit: 9013bf583a
Built: Fri Oct 18 15:52:22 2019
Server: Docker Engine - Community
API version: 1.39 (minimum version 1.12)
Go version: go1.10.6
Git commit: 4c52b90
Built: Wed Jan 9 19:06:30 2019
I will try the URL you send me today.
my moodle site: https://mood.nbpt.edu.cn
Today, I reinstalled My moodle server use CentOS-7-x86_64-DVD-1908.iso, then installed docker-ce-19 ,then installed jobe， and have no problem, jobe runed very well.
so I guess maybe the 4.18 kernel of centos8 is not match docker!!!
centos 7 's kernel is 3.10, it is frendly to jobe!!!
my problem is ok now, thanks for your coderunner !!! it's a very wonderful moodle plugs. you are great!!!