Resource quotas :

Resource quotas are limits applied to system resources. They are enforced at the namespace level.

They offer us a way to keep the applications running inside the containers from "over-consuming" system resources ( CPU and RAM ).

Quotas and namespaces:


Quotas are tied to namespaces, we can have different quotas in different namespaces.

Below is a Yaml file of a quota "quota-file":


* requests.cpu: the total CPU "mcores" that all the containers in the namespace can have.
* requests.memory: total memory that all the containers in the namespace can have.
* limits.cpu: maximum limit that all the containers in the namespace can have.
* limits.memory: the maximum limit of memory that all the containers in the namespace can have.

Remark:

"mcores" means "mili-cores". For example "250mcores" is the quarter of a CPU resources and "500mcores" is half of a CPU resources.

We can create the quota using the below command:


Limit ranges:

The limit range is a kubernetes resource that is enforced at the container level.

Below is a Yaml file of a LimitRange resource:


To create our LimitRange object we use the below command:


Remark:

All the container created in that namespace "namespace_name", will be subjected to the above limits.
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