Refresher on Samarthya

Ansible: Refresher

Thu, 02 Feb 2023 12:00:00 +0000

Recreated in October 2026 from the post; the original image was lost

What is Ansible?
#

Ansible is an open-source software platform for automating and configuring computer systems. It allows you to manage, deploy and orchestrate applications, infrastructure, and network devices using a simple, human-readable language. Ansible uses a push-based architecture, where tasks are executed on remote hosts from a central control machine, and does not require agents to be installed on target systems.

ClusterRole: Refresher

Tue, 06 Apr 2021 11:26:35 +0000

In this blog I will use kubectl to create a ClusterRole and a ClusterRoleBinding (refer to link)

{
 "kind": "ClusterRole",
 "apiVersion": "rbac.authorization.k8s.io/v1",
 "metadata": {
 "name": "myclusterrole",
 "creationTimestamp": null
 },
 "rules": [
 {
 "verbs": [
 "get",
 "list",
 "watch"
 ],
 "apiGroups": [
 ""
 ],
 "resources": [
 "persistentvolumes"
 ]
 }
 ]
}

k create clusterrole myclusterrole --verb=get,list,watch --resource=persistentvolumes

k describe clusterrole myclusterrole

You can use a ClusterRole to

define permissions on namespaced resources and be granted within individual namespace(s)
define permissions on namespaced resources and be granted across all namespaces
define permissions on cluster-scoped resources

Kernel Mode

Sat, 17 Oct 2020 14:58:39 +0000

The CPU operates in two modes in Linux

User mode (non privileged mode)
Kernel mode (System mode)

When operating in Kernel mode it has un-restricted access to resources like memory and input output devices.

Refresher on Samarthya

Ansible: Refresher

What is Ansible? #

ClusterRole: Refresher

Kernel Mode

What is Ansible?
#