Di Xu dixudx

Generate private key (.key)

# Key considerations for algorithm "RSA" ≥ 2048-bit
openssl genrsa -out server.key 2048
    
# Key considerations for algorithm "ECDSA" ≥ secp384r1
# List ECDSA the supported curves (openssl ecparam -list_curves)
openssl ecparam -genkey -name secp384r1 -out server.key

How to extract a single file with its history from a git repository

These steps show two less common interactions with git to extract a single file which is inside a subfolder from a git repository. These steps essentially reduce the repository to just the desired files and should performed on a copy of the original repository (1.).

First the repository is reduced to just the subfolder containing the files in question using git filter-branch --subdirectory-filter (2.) which is a useful step by itself if just a subfolder needs to be extracted. This step moves the desired files to the top level of the repository.

Finally all remaining files are listed using git ls, the files to keep are removed from that using grep -v and the resulting list is passed to git rm which is invoked by git filter-branch --index-filter (3.). A bit convoluted but it does the trick.

1. copy the repository to extract the file from and go to the desired branch

1 . goto beyond compare folder

 cd "/Applications/Beyond Compare.app/Contents/MacOS/"

2 . rename BCompare to BCompare.real

 mv BCompare BCompare.real

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

The Goal

Set up Kubernetes on 3 Debian Jessie virtual machines: One master. Two nodes. Additionally do this without any "magic" so that what is required to be running to make everything work is plain and obvious.

We will be using flannel for the inter-machine networking layer. Mainly because it is useful and it seems to be pretty popular.

	# Download and Install the Latest Updates for the OS
	apt-get update && apt-get upgrade -y

	# Set the Server Timezone to CST
	echo "America/Chicago" > /etc/timezone
	dpkg-reconfigure -f noninteractive tzdata

	# Enable Ubuntu Firewall and allow SSH & MySQL Ports
	ufw enable
	ufw allow 22

	import "bytes"

	func StreamToByte(stream io.Reader) []byte {
	buf := new(bytes.Buffer)
	buf.ReadFrom(stream)
	return buf.Bytes()
	}

	func StreamToString(stream io.Reader) string {
	buf := new(bytes.Buffer)

	package main

	import (
	"fmt"
	"reflect"
	)

	type Foo struct {
	FirstName string `tag_name:"tag 1"`
	LastName string `tag_name:"tag 2"`

	We are using keystone as a global service and hence its centre of universe .
	Any api calls internal or via customer for the OpenStack cloud has to go via keystone for auth which internally calls ldap and ,etc.
	Also keystone is running on a seperate box , seperate from other OpenStack components.
	Need some approvals to post architecture related data and hence just briefed as above to give some insight.

	Producer

	Setup
	bin/kafka-topics.sh --zookeeper esv4-hcl197.grid.linkedin.com:2181 --create --topic test-rep-one --partitions 6 --replication-factor 1
	bin/kafka-topics.sh --zookeeper esv4-hcl197.grid.linkedin.com:2181 --create --topic test --partitions 6 --replication-factor 3

	Single thread, no replication

	bin/kafka-run-class.sh org.apache.kafka.clients.tools.ProducerPerformance test7 50000000 100 -1 acks=1 bootstrap.servers=esv4-hcl198.grid.linkedin.com:9092 buffer.memory=67108864 batch.size=8196