artizirk

This uses Linux kernel dyamic debug features

https://www.kernel.org/doc/html/latest/admin-guide/dynamic-debug-howto.html

This asumes that debugfs is mounted under /sys/kernel/debug

Enable WireGuard debug

echo 'module wireguard +p' | sudo tee /sys/kernel/debug/dynamic_debug/control

chendotjs

#include <bcc/proto.h>
#include <uapi/linux/ip.h>
#include <uapi/linux/ipv6.h>
#include <uapi/linux/icmp.h>
#include <uapi/linux/tcp.h>
#include <uapi/linux/udp.h>
#include <uapi/linux/icmpv6.h>
#include <net/inet_sock.h>
#include <linux/netfilter/x_tables.h>

baalajimaestro

iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE
iptables -t nat -A POSTROUTING -s 10.0.2.0/24 -o eth0 -j MASQUERADE
# allow established sessions to receive traffic
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
# allow your application port
iptables -I INPUT -p tcp --dport 443 -j ACCEPT
iptables -I INPUT -p udp --dport 443 -j ACCEPT
# allow SSH
iptables -I INPUT -p tcp --dport 22 -j ACCEPT
# Allow Ping

asukakenji

Go (Golang) GOOS and GOARCH

All of the following information is based on go version go1.17.1 darwin/amd64.

GOOS Values

GOOS	Out of the Box
aix	✅
android	✅

brennanMKE

class EventEmitter

    /// Shared Instance.
    public static var sharedInstance = EventEmitter()

    // ReactNativeEventEmitter is instantiated by React Native with the bridge.
    private static var eventEmitter: ReactNativeEventEmitter!

    private init() {}

mgoodness

AWS Service annotations

• service.beta.kubernetes.io/aws-load-balancer-access-log-emit-interval (in minutes)
• service.beta.kubernetes.io/aws-load-balancer-access-log-enabled (true|false)
• service.beta.kubernetes.io/aws-load-balancer-access-log-s3-bucket-name
• service.beta.kubernetes.io/aws-load-balancer-access-log-s3-bucket-prefix
• service.beta.kubernetes.io/aws-load-balancer-additional-resource-tags (comma-separated list of key=value)
• service.beta.kubernetes.io/aws-load-balancer-backend-protocol (http|https|ssl|tcp)
• service.beta.kubernetes.io/aws-load-balancer-connection-draining-enabled (true|false)

elico

package main

import (
	"fmt"
	"io"
	"net"
	"time"
)

func main() {

valyala

Optimizing postgresql table for more than 100K inserts per second

• Create UNLOGGED table. This reduces the amount of data written to persistent storage by up to 2x.
• Set WITH (autovacuum_enabled=false) on the table. This saves CPU time and IO bandwidth on useless vacuuming of the table (since we never DELETE or UPDATE the table).
• Insert rows with COPY FROM STDIN. This is the fastest possible approach to insert rows into table.
• Minimize the number of indexes in the table, since they slow down inserts. Usually an index on time timestamp with time zone is enough.
• Add synchronous_commit = off to postgresql.conf.
• Use table inheritance for fast removal of old data:

d4l3k

This is a gist with a set of helpful performance tricks and best practices that I've found on the internet.

iamralch

import (
	"archive/zip"
	"io"
	"os"
	"path/filepath"
	"strings"
)

func zipit(source, target string) error {
	zipfile, err := os.Create(target)