ycTIN - IT Professional

Generate a Certificate Signing Request(CSR) with OpenSSL / Linux

October 3, 2020October 3, 2020 Timmy Tin Leave a comment

Commands:

openssl genrsa -out ~/domain.com.ssl/domain.com.key 2048

1	openssl genrsa -out ~/domain.com.ssl/domain.com.key 2048

openssl req -new -sha256 -key ~/domain.com.ssl/domain.com.key -out ~/domain.com.ssl/domain.com.csr

1	openssl req -new -sha256 -key ~/domain.com.ssl/domain.com.key -out ~/domain.com.ssl/domain.com.csr

References:

https://support.rackspace.com/how-to/generate-a-csr-with-openssl/

Compile FFmpeg + kxmovie (Xcode 7.3, iOS SDK 9)

October 3, 2020October 3, 2020 Timmy Tin Leave a comment

Preparation

http://www.ffmpeg.org/download.html

https://github.com/yuvi/gas-preprocessor

https://github.com/kewlbear/FFmpeg-iOS-build-script

References

http://al1020119.github.io/blog/2016/01/11/ffmpeg-kxmovies/
http://www.liuxiao.org/2015/08/ios-ffmpeg-%E8%A7%86%E9%A2%91%E8%A7%A3%E7%A0%81%E5%BA%93%E7%9A%84-ios-%E7%89%88%E6%9C%AC%E7%BC%96%E8%AF%91%E5%92%8C-kxmovie-%E6%92%AD%E6%94%BE%E5%99%A8/

How to play flv file or stream in iOS

October 3, 2020October 3, 2020 Timmy Tin Leave a comment

FFmpegPlayer-iOS – A movie player for iOS based on FFmpeg.

https://github.com/kolyvan/kxmovie

(FFmpeg + kxmovie)

http://al1020119.github.io/blog/2016/01/11/ffmpeg-kxmovies/

Convert PDF to Images in Linux via Command Line

October 3, 2020October 3, 2020 Timmy Tin Leave a comment

program to convert PDF files into HTML, XML and PNG images

Installation

Debian User install pdftohtml using following command:

sudo apt-get install poppler-utils

1	sudo apt-get install poppler-utils

Red Hat / Fedora user install pdftohtml using following command:

sudo yum install poppler-utils

1	sudo yum install poppler-utils

More details:

https://manpages.debian.org/testing/poppler-utils/pdftohtml.1.en.html

Setup Asterisk server for telephone validation and cleaning

October 3, 2020October 3, 2020 Timmy Tin Leave a comment

Prepare a computer with PCI slot

Consider the cost and compatibility, normally I will use Dell desktop or server.

Install telephony interface cards into your computer

Telephony interface cards are PCI or PCI Express expansion cards that connect computers running Asterisk directly to legacy phone lines, phones and phone systems. The cards convert the legacy signaling and media into Asterisk’s internal formats.

I chosen Digium cards, because Asterisk is provided by Digium. A lot of cheaper alternative cards, I just don’t want to facing compatible issue.

More details for telephony interface cards:
http://www.asterisk.org/products/telephony-interface-cards

Digium telephony interface cards products:
https://www.digium.com/products/telephony-cards

Download and install AsteriskNOW

Simple, just refer to this link:
https://wiki.asterisk.org/wiki/display/AST/Installing+AsteriskNOW

Configuration

Login FreePBX Administration via http://<server-ip>
Update Connectivity > DAHDi Config > Global Settings
- Select Language: <your preferred language>
- Enable Busy Detect: Yes
- Other Global Dahdi Settings: callprogress = yes
Update Connectivity > DAHDi Config > System Settings
- Tone Region: <select your country or compatible>
Update Connectivity > DAHDi Config > Modprobe Settings
- Opermode: enable, <select your country or compatible>
Click save config andRestart Dahai and asterisk
Update Settings > Advanced Settings
1. Country Indication Tones: <select your country or compatible>

Test Asterisk Manager

Default Asterisk Manager User: admin
Default Asterisk Manager Password: amp111

http://www.voip-info.org/wiki/view/Asterisk+Manager+API+Action+Originate

Dialplan for Asterisk Manager

File: /etc/asterisk/extensions_custom.conf

[macro-hangup]]
include => ext-local
exten => s,1,Answer()
;exten => s,n,Background("hello")
;exten => s,n,Wait(5)
exten => s,n,HangUp()

[macro-recording-10]
include => ext-local
;exten => s,1,Answer()
exten => s,1,MixMonitor(/var/www/html/autodial/recording_new/${CALLERID(num)}.wav,W(4))
;exten => s,n,Record(autodial/%d.wav,0,10,q)
;exten => s,n,Playback(hello-world)
exten => s,n,Wait(10)
exten => s,n,HangUp()

[macro-hangup]]

include => ext-local

exten => s,1,Answer()

;exten => s,n,Background("hello")

;exten => s,n,Wait(5)

exten => s,n,HangUp()

[macro-recording-10]

include => ext-local

;exten => s,1,Answer()

exten => s,1,MixMonitor(/var/www/html/autodial/recording_new/${CALLERID(num)}.wav,W(4))

;exten => s,n,Record(autodial/%d.wav,0,10,q)

;exten => s,n,Playback(hello-world)

exten => s,n,Wait(10)

exten => s,n,HangUp()

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

October 3, 2020October 3, 2020 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

phpWhois

October 3, 2020October 3, 2020 Timmy Tin Leave a comment

Introduction

This package contains a Whois (RFC954) library for PHP. It allows a PHP program to create a Whois object, and obtain the output of a whois query with the lookup function.

The response is an array containing, at least, an element ‘rawdata’, containing the raw output from the whois request.

In addition, if the domain belongs to a registrar for which a special handler exists, the special handler will parse the output and make additional elements available in the response. The keys of these additional elements are described in the file HANDLERS.md.

It fully supports IDNA (internationalized) domains names as defined in RFC3490, RFC3491, RFC3492 and RFC3454.

It also supports ip/AS whois queries which are very useful to trace SPAM. You just only need to pass the doted quad ip address or the AS (Autonomus System) handle instead of the domain name. Limited, non-recursive support for Referral Whois (RFC 1714/2167) is also provided.

Requirements

phpWhois requires PHP 5.3 or better with OpenSSL support to work properly.

Without SSL support you will not be able to query domains which do not have a whois server but that have a https based whois.

Download

https://github.com/phpWhois/phpWhois

Unable to start firewalld, Active: failed (Result: timeout)

October 3, 2020October 3, 2020 Timmy Tin Leave a comment

Problem:

Try to start firewalld service via the following command

systemctl start firewalld

1	systemctl start firewalld

but get the following error after few seconds no response:

firewalld.service: Start operation timed out. Terminating. 
firewalld.service: Failed with result 'timeout'. 
systemd: Failed to start firewalld - dynamic firewall daemon.

firewalld.service: Start operation timed out. Terminating.

firewalld.service: Failed with result 'timeout'.

systemd: Failed to start firewalld - dynamic firewall daemon.

Solution:

Execute the following command to restart firewalld service

systemctl stop firewalld;pkill -f firewalld;systemctl start firewalld

1	systemctl stop firewalld;pkill -f firewalld;systemctl start firewalld

How to Install NGINX and PHP 7.3 with PHP-FPM on RHEL/CentOS 7

August 7, 2019November 3, 2020 Timmy Tin Leave a comment

Basic Server Setup

# update system
sudo yum install -y http://rpms.remirepo.net/enterprise/remi-release-7.rpm
sudo yum install -y epel-release yum-utils 
sudo yum update -y

# update system

sudo yum install -y http://rpms.remirepo.net/enterprise/remi-release-7.rpm

sudo yum install -y epel-release yum-utils

sudo yum update -y

# temporary switches off SELinux enforcing 
sudo setenforce 0

1 2	# temporary switches off SELinux enforcing sudo setenforce 0

# setup timezone
sudo rm /etc/localtime
sudo ln -s /usr/share/zoneinfo/Hongkong /etc/localtime

# setup ntp service
sudo yum -y install ntp
sudo ntpdate pool.ntp.org
sudo systemctl enable ntpd
sudo systemctl start ntpd

# setup timezone

sudo rm /etc/localtime

sudo ln -s /usr/share/zoneinfo/Hongkong /etc/localtime

# setup ntp service

sudo yum -y install ntp

sudo ntpdate pool.ntp.org

sudo systemctl enable ntpd

sudo systemctl start ntpd

Setup Default PHP Version

## Install PHP 7.3 
yum --enablerepo=remi-php73 install php php-mbstring php-gd php-bcmath php-tidy php-xml php-xmlrpc php-soap php-mysql php-pdo php-devel

## Install PHP 7.2 
yum --enablerepo=remi-php72 install php php-mbstring php-gd php-bcmath php-tidy php-xml php-xmlrpc php-soap php-mysql php-pdo php-devel

## Install PHP 7.1 
yum --enablerepo=remi-php71 install php php-mbstring php-gd php-bcmath php-tidy php-xml php-xmlrpc php-soap php-mysql php-pdo php-devel

## Install PHP 7.3

yum --enablerepo=remi-php73 install php php-mbstring php-gd php-bcmath php-tidy php-xml php-xmlrpc php-soap php-mysql php-pdo php-devel

## Install PHP 7.2

yum --enablerepo=remi-php72 install php php-mbstring php-gd php-bcmath php-tidy php-xml php-xmlrpc php-soap php-mysql php-pdo php-devel

## Install PHP 7.1

yum --enablerepo=remi-php71 install php php-mbstring php-gd php-bcmath php-tidy php-xml php-xmlrpc php-soap php-mysql php-pdo php-devel

Setup NGINX and PHP-FPM

# install NGINX and PHP with PHP-FPM
sudo yum install -y vim nginx php-fpm
sudo systemctl enable nginx php-fpm
sudo systemctl start nginx php-fpm

# install NGINX and PHP with PHP-FPM

sudo yum install -y vim nginx php-fpm

sudo systemctl enable nginx php-fpm

sudo systemctl start nginx php-fpm

Update Configuration

# update PHP configuration
sudo vi /etc/php.ini
:%s#;date.timezone =#date.timezone = Asia/Hong_Kong#
:%s#expose_php = On#expose_php = Off#
:wq

# update PHP configuration

sudo vi /etc/php.ini

:%s#;date.timezone =#date.timezone = Asia/Hong_Kong#

:%s#expose_php = On#expose_php = Off#

:wq

# update php-fpm configuration
sed -i 's/^user =.*$/user = nginx/g' /etc/php-fpm.d/www.conf
sed -i 's/^group =.*$/group = nginx/g' /etc/php-fpm.d/www.conf
cat /etc/php-fpm.d/www.conf

# update php-fpm configuration

sed -i 's/^user =.*$/user = nginx/g' /etc/php-fpm.d/www.conf

sed -i 's/^group =.*$/group = nginx/g' /etc/php-fpm.d/www.conf

cat /etc/php-fpm.d/www.conf

# update NGINX configuration
sudo cp /etc/nginx/nginx.conf /etc/nginx/nginx.conf.bak
sudo tac /etc/nginx/nginx.conf.bak | awk '!p && /}/{print "\n}\n    include /etc/nginx/vhosts/*.conf;";p=1;next} 1' | tac \
| awk '!p && /server {/{print "    index index.php index.html index.htm;\n";p=1} 1' \
| awk '!p && /root/{print "        root         /var/www/html;";p=1;next} 1' \
| sudo tee /etc/nginx/nginx.conf

# update NGINX configuration

sudo cp /etc/nginx/nginx.conf /etc/nginx/nginx.conf.bak

sudo tac /etc/nginx/nginx.conf.bak | awk '!p && /}/{print "\n}\n include /etc/nginx/vhosts/*.conf;";p=1;next} 1' | tac \

| awk '!p && /server {/{print " index index.php index.html index.htm;\n";p=1} 1' \

| awk '!p && /root/{print " root /var/www/html;";p=1;next} 1' \

| sudo tee /etc/nginx/nginx.conf

# create folders and update permission
sudo mkdir -p /etc/nginx/vhosts/
sudo mkdir -p /var/www/html/
sudo mkdir -p /var/www/vhosts/
sudo chown nginx:nginx /var/www/html/ -R
sudo chown nginx:nginx /var/www/vhosts/ -R

# create folders and update permission

sudo mkdir -p /etc/nginx/vhosts/

sudo mkdir -p /var/www/html/

sudo mkdir -p /var/www/vhosts/

sudo chown nginx:nginx /var/www/html/ -R

sudo chown nginx:nginx /var/www/vhosts/ -R

Create Virtual Hosts

# create dummy virtual host
sudo cat > /etc/nginx/vhosts/example.com.conf <<- "EOF"

# redirect to www
##server {
##    listen       80;
##    server_name  example.com;
##    return       301 http://www.example.com$request_uri;
##}

server {
    listen       80;
    server_name  www.example.com;
    root         /var/www/vhosts/example.com/www;

    location / {
        try_files $uri $uri/ /index.php?$args;
    }

    location ~ .php$ {
        #fastcgi_pass unix:/var/run/php-fpm.sock;
        fastcgi_pass 127.0.0.1:9000;
        fastcgi_index /index.php;
        include /etc/nginx/fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_read_timeout 300;
    }
}

EOF

# create dummy virtual host

sudo cat > /etc/nginx/vhosts/example.com.conf <<- "EOF"

# redirect to www

##server {

## listen 80;

## server_name example.com;

## return 301 http://www.example.com$request_uri;

##}

server {

listen 80;

server_name www.example.com;

root /var/www/vhosts/example.com/www;

location / {

try_files $uri $uri/ /index.php?$args;

}

location ~ .php$ {

#fastcgi_pass unix:/var/run/php-fpm.sock;

fastcgi_pass 127.0.0.1:9000;

fastcgi_index /index.php;

include /etc/nginx/fastcgi_params;

fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;

fastcgi_read_timeout 300;

}

EOF

# create ip vhost from dummy virtual host 
cat /etc/nginx/vhosts/example.com.conf | sed '/^#/ d' | sed "s/[www.]*example.com/10.0.6.29/" | sudo tee /etc/nginx/vhosts/10.0.6.29.conf
sudo mkdir -p /var/www/vhosts/10.0.6.29/www/
echo "<?php phpinfo();" | sudo tee /var/www/vhosts/10.0.6.29/www/index.php
sudo nginx -s reload

# create ip vhost from dummy virtual host

cat /etc/nginx/vhosts/example.com.conf | sed '/^#/ d' | sed "s/[www.]*example.com/10.0.6.29/" | sudo tee /etc/nginx/vhosts/10.0.6.29.conf

sudo mkdir -p /var/www/vhosts/10.0.6.29/www/

echo "<?php phpinfo();" | sudo tee /var/www/vhosts/10.0.6.29/www/index.php

sudo nginx -s reload

# create www vhost from dummy virtual host 
cat /etc/nginx/vhosts/example.com.conf | sed "s/example.com/yctin.com/" | sed "s/##//" | sudo tee /etc/nginx/vhosts/yctin.com.conf
sudo mkdir -p /var/www/vhosts/yctin.com/www/
echo "<?php phpinfo();" | sudo tee /var/www/vhosts/yctin.com/www/index.php
sudo nginx -s reload

# create www vhost from dummy virtual host

cat /etc/nginx/vhosts/example.com.conf | sed "s/example.com/yctin.com/" | sed "s/##//" | sudo tee /etc/nginx/vhosts/yctin.com.conf

sudo mkdir -p /var/www/vhosts/yctin.com/www/

echo "<?php phpinfo();" | sudo tee /var/www/vhosts/yctin.com/www/index.php

sudo nginx -s reload

# create subdomain vhost from dummy virtual host 
cat /etc/nginx/vhosts/example.com.conf | sed '/^#/ d' | sed "s/example.com/yctin.com/g" | sed "s/www\./demo\./g" | sed "s/www;/demo;/g" | sudo tee /etc/nginx/vhosts/yctin.com.conf
sudo mkdir -p /var/www/vhosts/yctin.com/demo/
echo "<?php phpinfo();" | sudo tee /var/www/vhosts/yctin.com/demo/index.php
sudo nginx -s reload

# create subdomain vhost from dummy virtual host

sudo mkdir -p /var/www/vhosts/yctin.com/demo/

echo "<?php phpinfo();" | sudo tee /var/www/vhosts/yctin.com/demo/index.php

sudo nginx -s reload

Setup Firewall (Optional)

# setup firewall
sudo yum install firewalld -y
sudo systemctl enable firewalld
sudo systemctl start firewalld
sudo firewall-cmd --add-service=http --permanent
sudo firewall-cmd --add-service=https --permanent
sudo systemctl restart firewalld

# setup firewall

sudo yum install firewalld -y

sudo systemctl enable firewalld

sudo systemctl start firewalld

sudo firewall-cmd --add-service=http --permanent

sudo firewall-cmd --add-service=https --permanent

sudo systemctl restart firewalld

SELinux Settings (Optional for SELinux enabled)

# update selinux policy, required for selinux enabled (p.s. not best practice)
sudo setsebool -P httpd_anon_write 1
sudo chcon -u system_u -t httpd_sys_rw_content_t /var/www/html -R
sudo chcon -u system_u -t httpd_sys_rw_content_t /var/www/vhosts/ -R

# Allow PHP connect network
setsebool -P httpd_can_network_connect 1

# Allow PHP connect remote database
setsebool -P httpd_can_network_connect_db 1

# update selinux policy, required for selinux enabled (p.s. not best practice)

sudo setsebool -P httpd_anon_write 1

sudo chcon -u system_u -t httpd_sys_rw_content_t /var/www/html -R

sudo chcon -u system_u -t httpd_sys_rw_content_t /var/www/vhosts/ -R

# Allow PHP connect network

setsebool -P httpd_can_network_connect 1

# Allow PHP connect remote database

setsebool -P httpd_can_network_connect_db 1

Reboot after Setup

sudo reboot

1	sudo reboot

How to Install MySQL 8.0 on RHEL/CentOS 7

August 7, 2019August 7, 2019 Timmy Tin Leave a comment

Basic Server Setup

# update system
sudo yum install epel-release -y
sudo yum update -y

# update system

sudo yum install epel-release -y

sudo yum update -y

# temporary switches off SELinux enforcing 
sudo setenforce 0

1 2	# temporary switches off SELinux enforcing sudo setenforce 0

# setup timezone
sudo rm /etc/localtime
sudo ln -s /usr/share/zoneinfo/Hongkong /etc/localtime

# setup ntp service
sudo yum -y install ntp
sudo ntpdate pool.ntp.org
sudo systemctl enable ntpd
sudo systemctl start ntpd

# setup timezone

sudo rm /etc/localtime

sudo ln -s /usr/share/zoneinfo/Hongkong /etc/localtime

# setup ntp service

sudo yum -y install ntp

sudo ntpdate pool.ntp.org

sudo systemctl enable ntpd

sudo systemctl start ntpd

Setup MySQL 8.0

# adding the MySQL Yum Repository
sudo rpm -Uvh http://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm

# setup mysql server
sudo yum install mysql-server -y
sudo systemctl enable mysqld
sudo systemctl start mysqld

# adding the MySQL Yum Repository

sudo rpm -Uvh http://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm

# setup mysql server

sudo yum install mysql-server -y

sudo systemctl enable mysqld

sudo systemctl start mysqld

# get temporary root password
sudo cat /var/log/mysqld.log | grep "temporary password"
# 2016-10-22T06:14:44.222048Z 1 [Note] A temporary password is 
# generated for root@localhost: [TEMPORARY ROOT PASSWORD]

# config mysql server
mysql_secure_installation

# Securing the MySQL server deployment.
# Enter password for user root: [TEMPORARY ROOT PASSWORD]
# The existing password for the user account root has expired. Please set a new password.
# New password: [NEW PASSWORD]
# Re-enter new password: [NEW PASSWORD]
# Change the password for root ? : N
# Remove anonymous users? : Y
# Disallow root login remotely? : Y
# Remove test database and access to it? : Y
# Reload privilege tables now? : Y

# get temporary root password

sudo cat /var/log/mysqld.log | grep "temporary password"

# 2016-10-22T06:14:44.222048Z 1 [Note] A temporary password is

# generated for root@localhost: [TEMPORARY ROOT PASSWORD]

# config mysql server

mysql_secure_installation

# Securing the MySQL server deployment.

# Enter password for user root: [TEMPORARY ROOT PASSWORD]

# The existing password for the user account root has expired. Please set a new password.

# New password: [NEW PASSWORD]

# Re-enter new password: [NEW PASSWORD]

# Change the password for root ? : N

# Remove anonymous users? : Y

# Disallow root login remotely? : Y

# Remove test database and access to it? : Y

# Reload privilege tables now? : Y

Setup Firewall (Optional)

# setup firewall
sudo yum install firewalld -y
sudo systemctl enable firewalld
sudo systemctl start firewalld
sudo firewall-cmd --add-service=mysql --permanent

# setup firewall

sudo yum install firewalld -y

sudo systemctl enable firewalld

sudo systemctl start firewalld

sudo firewall-cmd --add-service=mysql --permanent

Reboot after Setup

reboot

reboot

Optional Settings for MySQL 8.0

Disable MySQL Strict Mode

# disable MySQL strict mode
vi /etc/my.cnf
sql-mode=
sudo systemctl restart mysqld

# disable MySQL strict mode

vi /etc/my.cnf

sql-mode=

sudo systemctl restart mysqld

Reference: https://dev.mysql.com/doc/refman/5.7/en/sql-mode.html

Fix MySQL Password Expired

To establish a global policy such that passwords never expire.

Update /etc/my.cnf

[mysqld]
default_password_lifetime=0

1 2	[mysqld] default_password_lifetime=0

Reference: https://dev.mysql.com/doc/refman/8.0/en/password-management.html#password-expiration-policy