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Mohan Balasundaram tuxfight3r

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tuxfight3r /
Last active January 6, 2023 10:14
kubectl jump server via kubectl port-forward
#!/usr/bin/env bash
# Allows you to connect to remote endpoints via port forward
set -e
function cleanup {
tuxfight3r /
Last active January 4, 2023 16:40
KafkaCat configuration for AWS MSK

KafkaCat Configuration for AWS MSK

Set the below environment variable with the following values

NOTE: Kafkacat is renamed to kcat recently and the config variable should be KCAT_CONFIG for version 1.7 onwards.

# you can export the variable or present the config with -F parameter for kafkacat
export KAFKACAT_CONFIG=/home/tools/persistent/kcat/kafkacat_config

Contents of kafkacat configuration

View gist:082ddafb892e3bbf00251b48782413a7
#Simple script to test all the pods liveness/readiness
#creates portforward and curls the endpoint for status
#clears the portforward at the end of the script
#uses bash v3 based implementation.
#Test only the pods which are up.
tuxfight3r / gist:b67e94e5a09c61c0c31b00ec0a6e8eb5
Created July 14, 2021 17:19
python decode kubernetes service token (JWT Token)
View gist:b67e94e5a09c61c0c31b00ec0a6e8eb5
# retrieve the default kubernetes service account token
kubectl get secret $(kubectl get serviceaccounts default -o jsonpath='{.secrets[0].name}') -o json|jq -r .data.token |base64 -D
# Decode it using Python (pip install PyJWT)
import jwt
jwt.decode(var, options={"verify_signature":False})
tuxfight3r / selfsigned-clusterissuer.yml
Last active July 15, 2021 21:08
kube cert-manager cert issuer
View selfsigned-clusterissuer.yml
kind: ClusterIssuer
name: selfsigned-cluster-issuer
selfSigned: {}
tuxfight3r /
Last active March 25, 2022 16:33
bash script to choose an option with dialog box
BACKTITLE="Cluster Options"
TITLE="Select Cluster"
MENU="Choose one of the following options:"
tuxfight3r /
Created May 7, 2021 17:14 — forked from ursuad/
Quick command reference for Apache Kafka

Kafka Topics

List existing topics

bin/ --zookeeper localhost:2181 --list

Describe a topic

bin/ --zookeeper localhost:2181 --describe --topic mytopic

Purge a topic

bin/ --zookeeper localhost:2181 --alter --topic mytopic --config

... wait a minute ...

tuxfight3r /
Last active March 17, 2021 00:04
validating EC2 pem / ssh key pairs
## Get private key fingerprint for AWS generated key ( will match the id in AWS Console)
$ openssl pkcs8 -in test_key.pem -inform PEM -outform DER -topk8 -nocrypt | openssl sha1 -c
(stdin)= f6:38:9c:53:9c:64:a8:b3:40:23:9f:6c:ed:0e:3d:bf:bf:16:bb:1c

## Get fingerpint from Openssh public key only md5 / sha1
$ ssh-keygen -f -e -m PKCS8 | openssl pkey -pubin -outform DER | openssl md5 -c
(stdin)= 55:b6:90:db:34:29:da:60:68:c9:08:24:f1:9f:c8:4b

tuxfight3r /
Last active December 22, 2022 05:58
kubectl configmap json patch

use kubectl to patch configmap via json patch operations (add/remove/replace/test)

## Add a new key to the existing configmap
$ kubectl patch cm demo-app-config --type json --patch '[{ "op": "add", "path": "/data/TEST_VALUE", "value": "test_key" }]'
configmap/demo-app-config patched

$ kubectl get cm demo-app-config -o json | jq .data.TEST_VALUE
tuxfight3r /
Created February 24, 2021 15:10 — forked from sahilsk/
Apache Kafka Cheat Sheet

Kafka Cheat Sheet

Display Topic Information

$ --describe --zookeeper localhost:2181 --topic beacon
Topic:beacon	PartitionCount:6	ReplicationFactor:1	Configs:
	Topic: beacon	Partition: 0	Leader: 1	Replicas: 1	Isr: 1
	Topic: beacon	Partition: 1	Leader: 1	Replicas: 1	Isr: 1