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TLS in a Nutshell

TOC

• What's TLS?
• TLS Protocol
• TLS Implementation

What's TLS?

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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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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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Use Proxy for Git/GitHub

Generally, the Git proxy configuration depends on the Git Server Protocol you use. And there're two common protocols: SSH and HTTP/HTTPS. Both require a proxy setup already. In the following, I assume a SOCKS5 proxy set up on localhost:1080. But it can also be a HTTP proxy. I'll talk about how to set up a SOCKS5 proxy later.

SSH Protocol

When you do git clone ssh://[user@]server/project.git or git clone [user@]server:project.git, you're using the SSH protocol. You need to configurate your SSH client to use a proxy. Add the following to your SSH config file, say ~/.ssh/config:

ProxyCommand nc -x localhost:1080 %h %p

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Compile C++ REST SDK on CentOS 7

C++ REST SDK is built on Ubuntu 16 by the offical document. To build it on CentOS 7, here's how.

Prerequisites:

1. Install build tools by sudo yum group install Development\ Tools
2. Install dependent libraries by sudo yum install zlib-devel libicu-devel openssl-devel
3. Get CMake 3.x binary from https://cmake.org/download/
4. Get Boost 1.58 source code from https://www.boost.org/users/history/ and install it under /opt/boost_1_58_0 by https://www.boost.org/doc/libs/1_58_0/more/getting_started/unix-variants.html#easy-build-and-install.

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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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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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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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ActiveRecord Bulk Write Patch

Usage

Suppose there's a table

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