jeremylin06

Linux NetFilter, IP Tables and Conntrack Diagrams

IPTABLES TABLES and CHAINS

IPTables has the following 4 built-in tables.

1) Filter Table

Filter is default table for iptables. So, if you don’t define you own table, you’ll be using filter table. Iptables’s filter table has the following built-in chains.

jeremylin06

Trusted SSL/TLS Certificate Stores on Linux Operating Systems and Applications

The SSL/TLS store location is not standardised across operating systems or even Linux distros. It could be anywhere in:

• /etc/ssl/certs
• /etc/pki/tls/certs/ca-bundle.crt
• /etc/ssl/certs/ca-bundle.crt
• /etc/pki/tls/certs/ca-bundle.trust.crt

jeremylin06

FILE SPACING:

 # double space a file
 sed G

 # double space a file which already has blank lines in it. Output file
 # should contain no more than one blank line between lines of text.
 sed '/^$/d;G'

jeremylin06

Disable Device Enrollment Notification on Mac.md

Restart the Mac in Recovery Mode by holding Comment-R during restart

Open Terminal in the recovery screen and type

csrutil disable

jeremylin06

Disable Device Enrollment Program (DEP) notification on macOS Catalina.md

With full reinstall (recommended)

   a. Boot into recovery using command-R during reboot, wipe the harddrive using Disk Utility, and select reinstall macOS

   b. Initial installation will run for approximately 1 hour, and reboot once

   c. It will then show a remaining time of about 10-15 minutes

jeremylin06

Removing a Mac's Firmware Password By Reflashing EFI ROM

According to Apple, the only way to remove an unknown firmware password from a MacBook (2011 and later) is to take it to the Apple Store with the original proof-of-purchase. However, I've found that there is another way, which I've been successful with for the unibody MacBook Pro--it's essentially just modifying a couple bytes in the EFI ROM, which should be simple. What's not simple, however, is figuring out how to read and write to the EFI chip. In this post, I'll talk about the process that I figured out and what worked for me.

The Official Method

Apple's method of resetting the firmware password is not reproducible, as Apple generates an SCBO file that unlocks the EFI using their private key. You can read more about this process here. The problem with this system is that, if you are in the unfortunate situation of neither having the firmware unlock pass

jeremylin06

apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
  labels:
    name: etcd
  name: etcd
spec:
  template:
    metadata:
      labels:

jeremylin06

#!/usr/bin/env bash

# Script to (selectively) save/load multiple Docker images to/from a directory.
# Run ./save-load-docker-images.sh for help.

set -e

directory=$PWD
filter=""
compress=0