-10 hushi55

Git Cheat Sheets and Examples

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.

Introduction to Kafka

Kafka acts as a kind of write-ahead log (WAL) that records messages to a persistent store (disk) and allows subscribers to read and apply these changes to their own stores in a system appropriate time-frame.

Terminology:

Producers send messages to brokers
Consumers read messages from brokers
Messages are sent to a topic

	/*
	* Here's a sample kernel module showing the use of jprobes to dump
	* the arguments of third-party network driver for Bercut ETN.
	*
	* For more information on theory of operation of jprobes, see
	* Documentation/kprobes.txt
	*
	* Build and insert the kernel module as done in the kprobe example.
	* You will see the trace data in /var/log/messages and on the
	* console whenever do_fork() is invoked to create a new process.

	1. Convert our ".jks" file to ".p12" (PKCS12 key store format):

	keytool -importkeystore -srckeystore oldkeystore.jks -destkeystore newkeystore.p12 -deststoretype PKCS12

	1.1. List new keystore file contents:

	keytool -deststoretype PKCS12 -keystore newkeystore.p12 -list

	2. Extract pem (certificate) from ".p12" keysotre file: