Operating System - ycTIN

Install and Secure Redis on CentOS 7

August 30, 2018August 30, 2018 Timmy Tin Leave a comment

Redis Installation

Add the EPEL repository, and update YUM

sudo yum install epel-release
sudo yum update -y

1 2	sudo yum install epel-release sudo yum update -y

Install Redis

sudo yum install redis -y

1	sudo yum install redis -y

Start Redis and setup automatically start Redis on boot

sudo systemctl start redis
sudo systemctl enable redis

1 2	sudo systemctl start redis sudo systemctl enable redis

Verify the Installation

redis-cli ping

1	redis-cli ping

If Redis is running, it will return: PONG

Redis Configuration

Password settings

sudo vi /etc/redis.conf
requirepass master_password

1 2	sudo vi /etc/redis.conf requirepass master_password

find and uncomment the requirepass line in the configuration file, and replace master_password with a secure password

Firewall settings

sudo yum install firewalld -y
sudo firewall-cmd --permanent --add-port=6379/tcp
sudo firewall-cmd --reload

sudo yum install firewalld -y

sudo firewall-cmd --permanent --add-port=6379/tcp

sudo firewall-cmd --reload

Local Benchmark Test

redis-benchmark -q -n 100000

1	redis-benchmark -q -n 100000

Check Redis Version

redis-server --version

1	redis-server --version

Setup PHP session to Redis

yum install php-pecl-redis
session.save_handler = redis
session.save_path = "tcp://<redis_server_ip>:6379?auth=<password>"

yum install php-pecl-redis

session.save_handler = redis

session.save_path = "tcp://<redis_server_ip>:6379?auth=<password>"

How to fix yum-config-manager: command not found

May 14, 2018May 14, 2018 Timmy Tin Leave a comment

You need to install yum-utils to use yum-config-manager

yum install yum-utils

1	yum install yum-utils

Install wkhtmltopdf & wkhtmltoimage to CentOS with Chinese & Asian fonts support

April 9, 2018April 9, 2018 Timmy Tin Leave a comment

Install dependencies

sudo yum install -y libpng
sudo yum install -y libjpeg
sudo yum install -y openssl
sudo yum install -y icu
sudo yum install -y libX11
sudo yum install -y libXext
sudo yum install -y libXrender
sudo yum install -y xorg-x11-fonts-Type1
sudo yum install -y xorg-x11-fonts-75dpi
sudo yum install -y poppler-utils
sudo yum install -y wget

sudo yum install -y libpng

sudo yum install -y libjpeg

sudo yum install -y openssl

sudo yum install -y icu

sudo yum install -y libX11

sudo yum install -y libXext

sudo yum install -y libXrender

sudo yum install -y xorg-x11-fonts-Type1

sudo yum install -y xorg-x11-fonts-75dpi

sudo yum install -y poppler-utils

sudo yum install -y wget

Install wkhtmltopdf and wkhtmltoimage

cd /tmp
wget https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.4/wkhtmltox-0.12.4_linux-generic-amd64.tar.xz
unxz wkhtmltox-0.12.4_linux-generic-amd64.tar.xz
tar -xvf wkhtmltox-0.12.4_linux-generic-amd64.tar
# mv wkhtmltox/bin/* /usr/local/bin/
mv wkhtmltox/bin/* /usr/bin/
rm -rf wkhtmltox
rm -f wkhtmltox-0.12.4_linux-generic-amd64.tar

cd /tmp

wget https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.4/wkhtmltox-0.12.4_linux-generic-amd64.tar.xz

unxz wkhtmltox-0.12.4_linux-generic-amd64.tar.xz

tar -xvf wkhtmltox-0.12.4_linux-generic-amd64.tar

# mv wkhtmltox/bin/* /usr/local/bin/

mv wkhtmltox/bin/* /usr/bin/

rm -rf wkhtmltox

rm -f wkhtmltox-0.12.4_linux-generic-amd64.tar

p.s. you can find more versions in the following link:

https://github.com/wkhtmltopdf/wkhtmltopdf/releases

Install Chinese & Asian fonts support

sudo yum groupinstall -y "fonts"

1	sudo yum groupinstall -y "fonts"

References

https://wkhtmltopdf.org/

Add swap to CentOS without reboot

April 9, 2018April 9, 2018 Timmy Tin Leave a comment

Add 4G swap

dd if=/dev/zero of=/swapfile bs=1024k count=4096
chown root:root /swapfile
chmod 0600 /swapfile
mkswap /swapfile
swapon /swapfile
echo "/swapfile swap swap defaults 0 0" >> /etc/fstab

dd if=/dev/zero of=/swapfile bs=1024k count=4096

chown root:root /swapfile

chmod 0600 /swapfile

mkswap /swapfile

swapon /swapfile

echo "/swapfile swap swap defaults 0 0" >> /etc/fstab

Some development information for Apple Wallet

March 22, 2018March 22, 2018 Timmy Tin Leave a comment

Some references for develop Add to Apple Wallet button in website

How to encrypt and decrypt .cpt file

September 2, 2017September 2, 2017 Timmy Tin Leave a comment

What is .cpt extension?

.cpt is a encrypted file format, you can use ccrypt to create and decrypt .cpt file

How to encrypt and decrypt .cpt file

Encrypt a file

ccencrypt /tmp/demo.txt

1	ccencrypt /tmp/demo.txt

Decrypt a file.

ccdecrypt /tmp/demo.txt.cpt

1	ccdecrypt /tmp/demo.txt.cpt

How to install ccrypt

Install ccrypt on CentOS

sudo yum install ccrypt

1	sudo yum install ccrypt

Install ccrypt on Debian/Ubuntu

sudo apt-get install ccrypt

1	sudo apt-get install ccrypt

Install MySQL-Python (MySQLdb) on macOS

July 18, 2017July 18, 2017 Timmy Tin Leave a comment

MySQLdb is an thread-compatible interface to the popular MySQL database server that provides the Python database API.

Standard Installation

# install mysql
brew install mysql
# update path
export PATH=$PATH:/usr/local/mysql/bin
# install MySQL-Python (MySQLdb)
pip install MySQL-Python

# install mysql

brew install mysql

# update path

export PATH=$PATH:/usr/local/mysql/bin

# install MySQL-Python (MySQLdb)

pip install MySQL-Python

EnvironmentError: mysql_config not found

You need install mysql and link, before install MySQL-Python

# install mysql
brew install mysql
# update path
export PATH=$PATH:/usr/local/mysql/bin

# install mysql

brew install mysql

# update path

export PATH=$PATH:/usr/local/mysql/bin

How to fix homebrew or brew install permission denied

May 11, 2017May 11, 2017 Timmy Tin Leave a comment

Change the folder permission

sudo chown -R "$USER":admin /usr/local

1	sudo chown -R "$USER":admin /usr/local

CentOS 7 unable to login, display login incorrect immediately after input login name

April 1, 2017April 1, 2017 Timmy Tin Leave a comment

Problem

Unable to login linux console, always show login incorrect for any login name

Why

Selected some security profile(e.g. PCI-DSS) during installation, but network connection is unavailable.

Installer unable to download some packages from the internet, and caused installation failure. You may feel the installation time longer than no security profile.

In my case is CentOS installer missing the web proxy settings 🙁

How to Fix

Select other security profile or setup correct network connection, and re-install the system.

Reference

CentOS-7 Installer Security Profiles

2.1. Requirements

These profiles require a connection to the internet to install. If you select a security profile that can not connect to the internet on port 80 (to mirror.centos.org), your install may fail spectacularly and not even allow access to the console locally. Please only try these profiles while connected to the internet.

Packages will be installed from the internet if you use security profiles, even if those packages also reside on the ISOs.

https://wiki.centos.org/TipsAndTricks/C7SecurityProfiles

How to Install ffmpeg on RHEL/CentOS 7

January 22, 2017January 22, 2017 Timmy Tin Leave a comment

Install ffmpeg via ATRPMS repo

#install EPEL repo
sudo yum install epel-release -y

#install ATRPMS repo
sudo rpm -ivh https://www.mirrorservice.org/sites/dl.atrpms.net/el7-x86_64/atrpms/stable/atrpms-repo-7-7.el7.x86_64.rpm

# install ffmpeg
sudo yum install ffmpeg -y

# verify ffmpeg installation
ffmpeg -version

#install EPEL repo

sudo yum install epel-release -y

#install ATRPMS repo

sudo rpm -ivh https://www.mirrorservice.org/sites/dl.atrpms.net/el7-x86_64/atrpms/stable/atrpms-repo-7-7.el7.x86_64.rpm

# install ffmpeg

sudo yum install ffmpeg -y

# verify ffmpeg installation

ffmpeg -version

Try convert WAV file to MP3 format

ffmpeg -i input.wav -f mp3 output.mp3

1	ffmpeg -i input.wav -f mp3 output.mp3

References:

http://atrpms.net/documentation/install/

Redis Installation

Redis Configuration

Local Benchmark Test

Check Redis Version

Setup PHP session to Redis

Install dependencies

Install wkhtmltopdf and wkhtmltoimage

Install Chinese & Asian fonts support

References

Official Introduction

Add to Apple Wallet button Guidelines

Wallet Developer Guide

How to create signature for Apple Wallet passes using PHP

What is .cpt extension?

How to encrypt and decrypt .cpt file

Encrypt a file

Decrypt a file.

How to install ccrypt

Install ccrypt on CentOS

Install ccrypt on Debian/Ubuntu

Standard Installation

EnvironmentError: mysql_config not found

Problem

Why

How to Fix

Reference

2.1. Requirements

Install ffmpeg via ATRPMS repo

Try convert WAV file to MP3 format

References: