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Raspberry Pi NAS Server Getting Start

Install Raspbian OS

Get the OS image file(RASPBIAN STRETCH LITE) from https://www.raspberrypi.org/downloads/raspbian/, and write it into a SD card as said by https://www.raspberrypi.org/documentation/installation/installing-images/README.md

Config for Remote Access

• For a headless server, enable SSH by putting a “ssh” file into the root, as instructed by https://www.raspberrypi.org/documentation/remote-access/ssh/README.md The default username/password is: pi/raspberry
• For VNC(remote desktop) and other ways of remote access, refer to

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Getting Start on REST

A Simple Definition

REST is a style and a set of guide lines for web service, such as web API.

It

• is resource oriented
• uses HTTP method to convey method information
• uses URL to scope the resource to operate on

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ActiveRecord Bulk Write Patch

Usage

Suppose there's a table

create table users (
  id integer primary key,
  name text,

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Git on Windows: File EOL and Permission Mode

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Docker Command Line Completion in Bash

Prerequisites

1. Make sure bash completion is installed(It's installed by default in major Linux distributions, and Cygwin).
2. Put completion files to /etc/bash_completion.d/

Completion Files

• docker command: https://github.com/docker/docker-ce/blob/v18.06.0-ce/components/cli/contrib/completion/bash/docker
• docker-compose command: https://github.com/docker/compose/blob/1.23.1/contrib/completion/bash/docker-compose
• docker-machine command: https://github.com/docker/machine/blob/v0.16.0/contrib/completion/bash/docker-machine.bash

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Git Notes

EOL

1. Windows Git client sets core.ignorecase to true by default, you may need to disable it to detect server changes on file names. Check it by git config --get core.ignorecase, and set it by git config core.ignorecase false.
2. Detect file EOL by git grep -I '^M'. It searches for a literal CR character in files.

Diff

1. To git show more lines before and after the changed lines, use git show -U <NUM>.
2. To git diff a file/dir between two commits, use git diff [--] . Either commit can be omitted, in which case it's as if HEAD is used for that omitted commit.

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PBS in Brief

Core Concepts

• resource, chunk, vnode and host
• job
  • job array
• queue
• server

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Autoscale in CycleCloud

What is CycleCloud

CycleCloud is a product that

• makes it easy to create and manage HPC computer clusters
• is open to integrate with various HPC schedulers, like PBS, Slurm, HPC Pack, etc.
• is deployed by user

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Ubuntu VS CentOS

Package Management

	Ubuntu	CentOS
Search package that contains the file	dpkg -S <file>	rpm -qf <file>
List package files	dpkg -L <package>	rpm -ql <package>
Search packages with glob pattern	dpkg -l <pattern>	rpm -qa <pattern>
Show package info	dpkg -s <package> / dpkg -p <package>	rpm -qi <package>

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SSH Port Forwarding

Refer to https://help.ubuntu.com/community/SSH/OpenSSH/PortForwarding

Local Port Forwarding

man:

-L [bind_address:]port:remote_socket