Yapcheekian

docker run -it --rm -u yap ubuntu /bin/bash # run as non-root user

docker run -it --rm --security-opt=no-new-privileges ubuntu /bin/bash

docker run -it --rm --cap-drop all --cap-add NET_ADMIN ubuntu /bin/bash

docker run -it --rm --read-only --tmpfs /opt ubuntu /bin/bash

Yapcheekian

func selectionSort(items []int) {
	for x := 0; x < len(items) - 1; x++ {
		min := x
		for y := x+1; y < len(items); y++ {
			if items[y] < items[min] {
				min = y
			}
		}
		items[x], items[min] = items[min], items[x]
	}

Yapcheekian

Scenario 1: only 2 container (red and blue) created

ip link add veth-red type veth peer name veth-blue

ip link set veth-red netns red

ip link set veth-blue netns blue

ip -n red addr add 192.168.15.1 dev veth-red

Yapcheekian

Okta

1. Create an application in okta
2. Choose SAML2.0
3. Give a random app name
4. Single sign on URL: KIBANA_ENDPOINT_URL/api/security/saml/callback
5. Audience URI (SP Entity ID): KIBANA_ENDPOINT_URL/

elasticsearch.yml

xpack:

Yapcheekian

PUT /_template/fluentbit
{
  "fluenbit" : {
    "order" : 0,
    "index_patterns" : [
      "fluentbit-*"
    ],
    "settings" : {
      "index" : {
        "number_of_shards" : "10"

Yapcheekian

kubectl get certificaterequest
kubectl describe certificaterequest X
kubectl get order
kubectl describe order X
kubectl get challenge
kubectl describe challenge X

Yapcheekian

找一個準確值

循環條件: l <= r

縮減搜索空間: l = mid + 1, r = mid - 1

找一個模糊值(比4大的最小數)

循環條件: l < r

縮減搜索空間: l = mid, r = mid - 1 或者 l = mid + 1, r = mid

Yapcheekian

set -eu

REGION_SEPARATOR='--'

ec2_instance_id="$1"
ssh_user="$2"
ssh_port="$3"
ssh_public_key_path="$4"
ssh_public_key="$(cat "${ssh_public_key_path}")"
ssh_public_key_timeout=60

Yapcheekian

CORS flow diagram

Oauth

bytecode

huli

leetcode pattern

Yapcheekian

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>

int main(int argc, const char * argv[]) {
    srandom(getpid());
    for (int i = 0; i < 16; i++) {
        long int r = random();
        printf("%ld\n", r);