DevOps engineer explains Kubernetes environment variable expansion vs shell substitution

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A DevOps engineer documented their 57th day of training, working with Kubernetes and Azure. They created a Kubernetes pod with three predefined environment variables and observed how Kubernetes expands $(VARIABLE) syntax before the shell processes commands. The engineer noted that Kubernetes handles variable substitution at container startup, unlike shell variable expansion which occurs at runtime. They also highlighted differences between kubectl's display status 'Completed' and a pod's actual 'Succeeded' phase. The tasks were completed as part of the KodeKloud Engineer platform training.

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