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terraform: create an array of resources using for_each
3 min read
If we need to create multiple resources of the same kind based on a set of objects, we can use the for_each keyword for creating them.
08/06/2021
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Retrieve Oracle's versions using a SQL query
3 min read
One of the first things we might want to know about an Oracle database we have just connected is what version it is running. We can retrieve this information using an SQL query
07/06/2021
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What's a kubernetes DaemonSet?
2 min read
When it comes to kubernetes objects, maybe the one that is quite common but still causes a lot of confusion is the DaemonSet. What's it's function?
04/06/2021
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tail multiple kubernetes pods
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While debugging issues we might need to be able to see the output from multiple pods (or multiple) at the same time to be able to understand how they are interacting. Stern allows you to tail multiple pods on Kubernetes and even multiple containers within the pod
03/06/2021
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kubernetes: enforce resource limits using LimitRange
3 min read
If we want to make sure the resources for a given namespace are controlled yet we want to be able to give full control to whoever is creating objects in that namespace, we can use LimitRange to enforce some resource constraints:
- We can enforce a minimum and maximum (and it's default value) for compute resources per Pod or Container or storage request per PersistentVolumeClaim in the namespace
- We can also enfornce a ratio between request and limit for a resource (so that we are not abusing the control setting limits that are too wide) Set default request/limit for compute resources in a namespace and automatically inject them to Containers at runtime.
This is implemented as an admission controller that observes the incoming requests and makes sure that it does not violate any of the constraints enumerated in the LimitRange object within it's namespace.
02/06/2021
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