Skip to content

Instantly share code, notes, and snippets.

View alefebvre-ls's full-sized avatar

Alain Lefebvre alefebvre-ls

View GitHub Profile
@rushilgupta
rushilgupta / GoConcurrency.md
Last active February 9, 2026 20:17
Concurrency in golang and a mini Load-balancer

INTRO

Concurrency is a domain I have wanted to explore for a long time because the locks and the race conditions have always intimidated me. I recall somebody suggesting concurrency patterns in golang because they said "you share the data and not the variables".

Amused by that, I searched for "concurrency in golang" and bumped into this awesome slide by Rob Pike: https://talks.golang.org/2012/waza.slide#1 which does a great job of explaining channels, concurrency patterns and a mini-architecture of load-balancer (also explains the above one-liner).

Let's dig in:

Goroutines

@maxvt
maxvt / infra-secret-management-overview.md
Last active December 17, 2025 16:51
Infrastructure Secret Management Software Overview

Currently, there is an explosion of tools that aim to manage secrets for automated, cloud native infrastructure management. Daniel Somerfield did some work classifying the various approaches, but (as far as I know) no one has made a recent effort to summarize the various tools.

This is an attempt to give a quick overview of what can be found out there. The list is alphabetical. There will be tools that are missing, and some of the facts might be wrong--I welcome your corrections. For the purpose, I can be reached via @maxvt on Twitter, or just leave me a comment here.

There is a companion feature matrix of various tools. Comments are welcome in the same manner.

@jvwing
jvwing / streamsetsdc.yaml
Created April 28, 2016 21:49
Cloud-Init Template for running StreamSets DC on EC2 (or other service)
#cloud-config
runcmd:
- echo "$(date) - Starting StreamSets Data Collector Install"
- yum install -y https://archives.streamsets.com/datacollector/1.3.0.1/rpm/streamsets-datacollector-1.3.0.1-1.noarch.rpm
- service sdc start
- chkconfig --add sdc
- echo "$(date) - Finished StreamSets Data Collector Install"
# StreamSets UI will be at http://<public dns>:18630/, u:admin, p:admin
# Be sure to open port 18630 on your security group, or use SSH port forwarding
# See https://streamsets.com/opensource/
@filipefigcorreia
filipefigcorreia / kafka-cheat-sheet.md
Last active October 28, 2025 20:11
Apache Kafka Cheat Sheet

Kafka Topics

List existing topics

bin/kafka-topics.sh --zookeeper localhost:2181 --list

Purge a topic

bin/kafka-topics.sh --zookeeper localhost:2181 --alter --topic mytopic --config retention.ms=1000

... wait a minute ...

bin/kafka-topics.sh --zookeeper localhost:2181 --alter --topic mytopic --delete-config retention.ms

@novalagung
novalagung / golang-create-read-write-delete-file.go
Last active August 21, 2024 05:09
package main
import (
"fmt"
"io"
"os"
)
var path = "/Users/novalagung/Documents/temp/test.txt"
@ipedrazas
ipedrazas / knife cheat
Last active August 11, 2025 20:28
Hello!
# knife cheat
## Search Examples
knife search "name:ip*"
knife search "platform:ubuntu*"
knife search "platform:*" -a macaddress
knife search "platform:ubuntu*" -a uptime
knife search "platform:ubuntu*" -a virtualization.system
knife search "platform:ubuntu*" -a network.default_gateway
@karmi
karmi / .gitignore
Last active March 26, 2025 08:35
Example Nginx configurations for Elasticsearch (https://www.elastic.co/blog/playing-http-tricks-nginx)
nginx/
!nginx/.gitkeep
!nginx/logs/.gitkeep
src/
tmp/
@morhekil
morhekil / nginx.conf
Created August 14, 2014 12:18
Full request/response body logging in nginx
http {
log_format bodylog '$remote_addr - $remote_user [$time_local] '
'"$request" $status $body_bytes_sent '
'"$http_referer" "$http_user_agent" $request_time '
'<"$request_body" >"$resp_body"';
lua_need_request_body on;
set $resp_body "";
body_filter_by_lua '
@stuart-warren
stuart-warren / apache2-logstash
Last active March 6, 2017 09:04
Apache2 logging config to output JSON in Logstash json_event format
# Create a log format called 'logstash_json' that emits, in json, the parts of an http
# request I care about. For more details on the features of the 'LogFormat'
# directive, see the apache docs:
# http://httpd.apache.org/docs/2.2/mod/mod_log_config.html#formats
# http://cookbook.logstash.net/recipes/apache-json-logs/
LogFormat "{ \"@timestamp\": \"%{%Y-%m-%dT%H:%M:%S%z}t\", \"@message\": \"%m %H %U%q %s\", \"@fields\": { \"client\": \"%a\", \"duration_usec\": %D, \"status\": %s, \"request\": \"%U%q\", \"method\": \"%m\", \"protocol\": \"%H\", \"referrer\": \"%{Referer}i\", \"user-agent\": \"%{User-agent}i\" } }" logstash_json
# Apache 2.4 adds sub-second precision logging
# http://httpd.apache.org/docs/2.4/mod/mod_log_config.html#formats
# LogFormat "{ \"@timestamp\": \"%{%Y-%m-%dT%H:%M:%S}t.%{msec_frac}t%{%z}t\", \"@message\": \"%m %H %U%q %s\", \"@fields\": { \"client\": \"%a\", \"duration_usec\": %D, \"status\": %s, \"request\": \"%U%q\", \"method\": \"%m\", \"protocol\": \"%H\", \"referrer\": \"%{Refer
@mike-zhang
mike-zhang / udpProxy.go
Created October 8, 2012 15:58
Implementation of a UDP proxy in Golang
// Implementation of a UDP proxy
package main
import (
"flag"
"fmt"
"log"
"net"
"os"