We are going to use Kubernetes... =| We already had positive experiences with it in other clients. Something around 3 years of use without major problems.
Some things might be missing, but all the core functionality needed by the customer will be there... We tried a lot with OpenShift 4.X as the customer was having problems with 3.X. But, we face some complicated situations and even with all our effort and dedication we can't solve them. So, even if we are frustrated, it turned out to be the right decision.
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Thanks!