During the upgrade the appliances will reboot to apply the OS updates. After the reboot the environment is unavailable and the upgrade is not progressing.
SSH into the appliances and check the permissions of directory /usr/lib/vmware-vcopssuite/utilities/conf if the permissions are drw-r-----
root@aria-ops [ /usr/lib/vmware-vcopssuite/utilities ]# ls -latgr
total 76
...
drw-r----- 2 admin 4096 Nov 14 11:49 conf
...
root@aria-ops [ /usr/lib/vmware-vcopssuite/utilities ]#
Aria Operations running on version 8.18.3.24663027
The issue is caused by the following redundant file which has unexpected quotes and a space in its name:
ls -lhtr /usr/lib/vmware-vcopssuite/utilities/conf/
...
rw------ 1 root root 14K Jun 16 07:32 ' vcops-photon-apache.conf.bak'
...
cd /usr/lib/vmware-vcopssuite/utilities/conf/
rm 'vcops-photon-apache.conf.bak'