Performance monitoring in Linux

CPU

cd /proc/

cat cpuinfo

less cpuinfo

less cpuinfo | grep processor

uptime

The load average is the CPU usage load average over 1 min, 5 min, and 15 min. The calculation for load avg value is given below.

For a single processor system:

Load avg value 1.0 = 100% CPU capacity usage

Load avg value 0.5 = 50% CPU capacity usage

This means for a 4 processor system:

Load avg value 4.0 = 100% CPU capacity usage

Load avg value 2.0 = 50% CPU capacity usage

Load avg value 1.0 = 25% CPU capacity usage

top

To get details of a process: ps aux | grep <process ID>

To get logs of a process: journalctl _PID=<process ID>

Memory

cat /proc/meminfo

less /proc/meminfo

free -h

Average memory usage view by samples with regular intervals: 

vmstat <interval> <number of samples>

Hope it was useful. Cheers!

Get insight into a Linux machine using Cockpit

Cockpit is an interactive Linux server admin interface. You can use it to monitor/ manage a Linux node through a web browser.

Install Cockpit on the Linux machine

yum install cockpit -y

systemctl start cockpit

systemctl enable --now cockpit.socket

Visualize your Kubernetes clusters and workloads using Octant

In this article, I will explain how to visualize your Kubernetes clusters and workload using Octant.   

Download Octant

You can download the latest release of Octant from https://github.com/vmware-tanzu/octant/releases.

Tanzu Kubernetes Grid (TKG) on vSphere 6.7 U3 - Part3

In this blog, I will explain how to deploy an FIO application pod with persistent storage on your Tanzu Kubernetes workload cluster.

Step 1: Deploy a K8s workload cluster

tkg create cluster <cluster name> --plan=dev

Now the workload K8s cluster is deployed with a Master, LB, and Worker node.

Tanzu Kubernetes Grid (TKG) on vSphere 6.7 U3 - Part2

In this post, I will explain how to deploy and manage multiple Kubernetes workload clusters using TKG CLI.

To view the management cluster: tkg get management-cluster

To create a new workload cluster: tkg create cluster <cluster name> --plan=<cluster plan>

Now as per default dev plan one master, one worker, and a load balancer are deployed.

Tanzu Kubernetes Grid (TKG) on vSphere 6.7 U3 - Part1

TKG is an enterprise-ready Kubernetes runtime which provides a consistent, upstream-compatible implementation of Kubernetes, that is tested, signed, and supported by VMware. 

Installation

I am using a 3 node vSAN cluster running vSphere 6.7 U3 to deploy TKG. The first step is to prepare a VM that will be used to kickstart the deployment process. Here I am using a CentOS 7 VM with desktop UI. Download the TKG CLI, TKG Kubernetes OVA, and Load Balancer OVA from the following link:

https://my.vmware.com/en/web/vmware/downloads/info/slug/infrastructure_operations_management/vmware_tanzu_kubernetes_grid/1_x 

I am using the following versions:

• VMware Tanzu Kubernetes Grid CLI 1.1 Linux
• VMware Tanzu Kubernetes Grid 1.1.0 Kubernetes v1.18.2 OVA
• VMware Tanzu Kubernetes Grid 1.1 Load Balancer OVA

Unzip and install TKG CLI on the CentOS VM.