02-07-2020
Normally if we are making upgrades to mission critical applications in 100s of servers in a large organization with a risk management team we should notify them if if we plan any upgrades which may cause an outage.
You should test in a test bed, make a plan, identify the risks and notify your risk management team.
Upgrading the core "mission critical" application on 200-300 web servers requires planning and team work.
What happens if you make a mistake and bring down the application(s)? Do you want your organization to be caught off guard when customers are calling in, angry their service is down?
You have described a major infrastructure upgrade. You certainly do not want to upgrade with YUM over a manually installed configuration until you have completed tested this idea in a test bed, insure you have backups of each application and database before hand, etc. In other words, you need a plan in coordination with your IT risk management team, customer service, etc.
This is how we work as IT professionals.
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