Abdul Matin shiponcs

Problem: Let's say you have created a k3s cluster and now you want to access it from outside the network. To do that you need to assign a public IP to your machine the cluster is running on. Recently I installed tailscale on the VM (on which a k3s cluster was running) so that I can access the cluster from my home. Here's how I did that.

First we need to add the Tailscale IP to tls-san of the cluster.

By default, configuration files are read from /etc/rancher/k3s/config.yaml and /etc/rancher/k3s/config.yaml.d/*.yaml in alphabetical order. 1

So, we create a config file if it doesn't exist:

cd /etc/rancher/k3s

First download this and extract it followed by getting inside.

Run Kafka server on local machine

Follow this

Create a topic to the server (running in local machine):

bin/kafka-topics.sh --create --topic quickstart-matin --bootstrap-server localhost:19092

Create a topic to the server (running in remote machine by KubeDB):

Bazel: a build tool by google

Installations:

Please see here

Guide to Learn Bazel in CPP

Fortunately the docs for Bazel with CPP are organized in here: https://bazel.build/docs/bazel-and-cpp

The root directory of the project is where WORKSPACE file is created.
All path is relative to the root directory.
BUILD is located per package.

stage3/
├── lib
│   ├── BUILD
│   ├── hello-time.cc
│   └── hello-time.h
├── main

grpcurl tool usages

I have a grpc server running at 0.0.0.0:50051. I'll show how you can use grpcurl to test it. Before that, install grpcurl (mybe using go).

List services the server provides:

user@matin ~/o/g/examples ((v1.55.1))> grpcurl  -plaintext localhost:50051 list
grpc.health.v1.Health
grpc.reflection.v1alpha.ServerReflection
helloworld.Greeter

	/home/shiponcs/office/envoy/tools/stack_decode.py:31: SyntaxWarning: invalid escape sequence '\['
	backtrace_marker = "\[backtrace\] [^\s]+"
	/home/shiponcs/office/envoy/tools/stack_decode.py:39: SyntaxWarning: invalid escape sequence '\d'
	stackaddr_re = re.compile("%s #\d+:(?: .*)? \[(0x[0-9a-fA-F]+)\]$" % backtrace_marker)
	/home/shiponcs/office/envoy/tools/stack_decode.py:42: SyntaxWarning: invalid escape sequence '\d'
	asan_re = re.compile(" #\d+ 0x[0-9a-fA-F]+ \([^+]\+(0x[0-9a-fA-F]+)\)")
	Defaulted container "envoy" out of: envoy, shutdown-manager
	[2025-02-24 22:27:02.781][1][warning][misc] [source/extensions/filters/network/http_connection_manager/config.cc:83] internal_address_config is not configured. The existing default behaviour will trust RFC1918 IP addresses, but this will be changed in next release. Please explictily config internal address config as the migration step.
	{"start_time":"2025-02-24T22:30:24.568Z","method":"GET","x-envoy-origin-path":"/","protocol":"HTTP/1.1","response_code":"

	#!/bin/bash

	# Ensure ENVOY_DOCKER_BUILD_DIR is set
	if [[ -z "$ENVOY_DOCKER_BUILD_DIR" ]]; then
	echo "[ERROR] The ENVOY_DOCKER_BUILD_DIR environment variable is not set."
	echo "Please set it using: export ENVOY_DOCKER_BUILD_DIR=/path/to/build/directory"
	exit 1
	fi

	echo "[INFO] Build directory is set to: $ENVOY_DOCKER_BUILD_DIR"

	apiVersion: kubedb.com/v1alpha2
	kind: Postgres
	metadata:
	name: pg-tls-15-3-new
	namespace: poc
	spec:
	version: "15.3"
	replicas: 1
	configSecret:
	name: user-conf

	# this configure file is only for envoy-filter-example repo
	admin:
	access_log_path: ./loglog.log
	address:
	socket_address:
	address: 127.0.0.1
	port_value: 0
	static_resources:
	clusters:
	name: cluster_0