Linux Misc

linux

Linux distribution info cat /etc/*-release lsb_release -a uname -mrs Check ram info sudo dmidecode -t memory sudo lshw -short -C memory Sh

May 16, 2017

HTTPS Tomcat Configuration

https, tomcat

Accepted format for keystore JKS PKCS11 PKCS12 (an internet standard, can be manipulated thru openssl) JKS Import root certificate (certifi

May 16, 2017

PlantUML

uml

Table Diagram123456789101112@startuml!define table(x) class x << (T,#AAFFFF) >>!define pk(x) <u>x</u>table(dummy) &#

May 16, 2017

armbian

armbian, docker

Docker12345678echo "deb https://packagecloud.io/Hypriot/Schatzkiste/debian/ wheezy main" > /etc/apt/sources.list.d/hypriot.listcurl https

May 16, 2017

Linux I/O Scheduler

io, linux

What Is I/O SchedulerThe purpose of I/O Scheduler is to improve the I/O performance fo traditional hard disk drive.Like merging I/O requests

May 06, 2017

Java Locks and Concurrency

concurrency, java, lock

LocksImplicit LocksOr synchronized methods and synchronized blocks. Each object in java has a intrinsic lock associated with it. Synchronize

Apr 21, 2017

JVM Options

java, jvm

OptionsSizing Option Description Example -Xms min heap size -Xms8G -Xmx max heap size -Xmx8G -Xmn min and max young size -Xmn2G

Apr 20, 2017

Java Memory Model

java, jvm

Areas Shared Amoung ThreadsMethod AreaIt stores following information, which are loaded by classloaders. class information the bytecode of

Apr 20, 2017

Port Forwarding

linux

Say you can ssh to a remote linux box, while you want to access a blocked port on that remote box, you can make a stub, and forword the requ

Apr 18, 2017

Ascii Art

ascii

123sudo apt-get install figletfiglet "Shell Hacks"dir /hao/softwares/figlet | xargs -n 1 figlet Hao Chen -f http://www.jave.de/figlet/figlet

Apr 18, 2017