Increased complexity

Adding an additional layer of complexity to your deployment, more difficult

to understand and troubleshoot issues that arise.

▪ Increased resource usage

Running an additional container in a pod will increase the resource usage

of the pod.

▪ Decreased performance

Pod can potentially decrease the performance of the pod, as the sidecar

container will be competing for resources with the main container.

▪ Limited flexibility

Can be inflexible in some cases, as it requires that the main container

and the sidecar container run in the same pod. 

https://iq.opengenus.org/sidecar-design-pattern/