PFB the link to download Virtual Image with Linux image GGATE1.ova and GGATE2.ova . Also the document for how to set up the Virtual box is present. Please follow the same to setup the Lab. In case of any issues please let me know.

The VM image is 13 GB and 14 GB of size and may take some time to download. Recommended to use wired connection and download them one at a time. Once downloaded follow the step by step pictorial doc to setup the VM. Same VMs could be used for Microservices training as well.

Pls note ggate1 and ggate2 are two machines. While importing the appliance choose option import all mac address one.
ggate1 download link:
https://drive.google.com/drive/folders/18GpQ05X-8Vcn2giSp9sTUzqf24H31qN9?usp=sharing

ggate2 download link:
https://drive.google.com/drive/folders/15QKtJtY17fgncT9AXmeicHWKdOoetj4p?usp=sharing
The DBs are already created in VMs.

Just start lsnrctl and DBs using command:

$>lsnrctl
lsnrctl>start
exit
on ggate1:
sqlplus / as sysdba
startup
alter pluggable database pdb1 open read write;

on ggate2:
sqlplus / as sysdba
startup
alter pluggable database pdb2 open read write;

Regards,
Ashish Agarwal
Call@+14168715708 (Canada)
My YouTube Channel:
https://www.youtube.com/channel/UCvhluuzVOQdpl3AF9PaIGLw
https://www.linkedin.com/in/ashish-agarwal-a1399663/