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CPU: percentage of limit

A lot of people land when trying to find out how to calculate CPU usage metric correctly in prometheus, myself included! So I'll post what I eventually ended up using as I think it's still a little difficult trying to tie together all the snippets of info here and elsewhere.

This is specific to k8s and containers that have CPU limits set.

To show CPU usage as a percentage of the limit given to the container, this is the Prometheus query we used to create nice graphs in Grafana:

sum(rate(container_cpu_usage_seconds_total{name!~".*prometheus.*", image!="", container_name!="POD"}[5m])) by (pod_name, container_name) /

bygui86

######################################################################
# Production-Ready Kubernetes Clusters Using Crossplane Compositions #
# https://youtu.be/uMC2QQfMctg                                       #
######################################################################

# Referenced videos:
# - Crossplane - GitOps-based Infrastructure as Code through Kubernetes API: https://youtu.be/n8KjVmuHm7A
# - How To Shift Left Infrastructure Management Using Crossplane Composites: https://youtu.be/AtbS1u2j7po

#################

bygui86

Enable auditing on KinD

TODO

• Use a webhook vs. file backend (maybe cloudrun?)
• This might only be possible if Docker is running as root - need to test

Config

Make a temporary directory to host files to be mounted in KinD.

bygui86

#!/usr/bin/env bash

source .env
# export PROJECT_ID=<from .env>
# export AUTH_NETWORK=<from .env>

export GCP_REGION=us-central1
export GCP_ZONE=us-central1-b
export CLUSTER_VERSION="1.16.13-gke.1"

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# This hosts file is brought to you by Dan Pollock and can be found at
# http://someonewhocares.org/hosts/
# You are free to copy and distribute this file for non-commercial uses,
# as long the original URL and attribution is included.

#<localhost>
127.0.0.1	localhost
127.0.0.1	localhost.localdomain
255.255.255.255	broadcasthost
::1		localhost

bygui86

Processing JSON using jq

jq is useful to slice, filter, map and transform structured json data.

Installing jq

On Mac OS

brew install jq

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Resources

KUBERNETES CLUSTER

• local https://github.com/kubernetes-sigs/kind (or just use minikube if it works for you)
• cloud https://cloud.google.com/kubernetes-engine (for PersistentVolume and Ingress, I needed to try the real deal)
• practice environment: https://github.com/arush-sal/cka-practice-environment

PRACTICE

bygui86

#!/usr/bin/env bash

set -e

CONTEXT="$1"

if [[ -z ${CONTEXT} ]]; then
  echo "Usage: $0 KUBE-CONTEXT"
  exit 1
fi

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URL="http://stackoverflow.com/"

# store the whole response with the status at the and
HTTP_RESPONSE=$(curl --silent --write-out "HTTPSTATUS:%{http_code}" -X POST $URL)

# extract the body
HTTP_BODY=$(echo $HTTP_RESPONSE | sed -e 's/HTTPSTATUS\:.*//g')

# extract the status
HTTP_STATUS=$(echo $HTTP_RESPONSE | tr -d '\n' | sed -e 's/.*HTTPSTATUS://')

bygui86

#!/bin/sh
# 
# This script adds 2 spring repositories to Nexus using curl
#

NEXUS_URL="http://${EVENTDRIVENMICROSERVICESPLATFORM_NEXUS_1_PORT_8081_TCP_ADDR}:${EVENTDRIVENMICROSERVICESPLATFORM_NEXUS_1_PORT_8081_TCP_PORT}/nexus"

POST_REPO_SERVICE="/service/local/repositories"
GET_REPO_SERVICE="/service/local/repositories"
PUT_PUBLIC_REPO_SERVICE="/service/local/repo_groups/public"