Upgrading to GCC 4.9.4 in CentOS 7 requires installing a newer version manually
Below bash script is for installing gcc 4.9.4 in CentOS 7. For your information,you should have sudo permission to install the above.
CentOS.zip
Configuring IP Address on Centos 6.7
On Centos 6.7,you can check IP address configuration by ifconfig command as below: .The below is the example of files on " / etc / sysconfig / network-scripts". Among above,ifcfg-eth0 and ifcfg-eth1 is wired network,and below is the reference example: .If ...
Generate Let’s Encrypt Wildcard SSL Certificate
STEP 1.Install Let’s Encrypt Certbot Tool.Before you can create free wildcard certificates,you need certbot installed.I’m using an CentOS Server here.To install it,run the following commands: .STEP 2.Generate Let’s Encrypt Wildcard SSL Certificate.After...
Set timezone and time on Centos 6.7
When using OAuth 1.0a, it requires timestamp for authentication. The followings are the example of shell commands which can set time information. Setup timezoneTo set the timezone of your system clock do the following:# rm -rf / etc / localtime# ln -...
mcrypt missing when using phpMyAdmin on Centos 6.7
“mcrypt” is an interface to the mcrypt library, which supports a wide variety of block algorithms such as DES, TripleDES, Blowfish (default), 3-WAY, SAFER-SK64, SAFER-SK128, TWOFISH, TEA, RC2 and GOST in CBC, OFB, CFB and ECB cipher modes. Additionally, ...
Adding new cron job for automated processing on every 10 minutes on Centos 6.7
The software utility Cron is a time-based job scheduler in Unix-like computer operating systems. People who set up and maintain software environments use cron to schedule jobs (commands or shell scripts) to run periodically at fixed times, dates, or interv...
Setup Apache+PHP+MySQL on Centos 6.7
If you installed Centos in minial installation mode, you should install Apache + PHP + MySQL manually.The followings are the procedure to install Apache + PHP + MySQL:Making apache and mysql to start automatically
How to mount windows shared folder on Centos 6.8 - mount error 12 = Cannot allocate memory to the mount.cifs(8)
In order to mount windows shared folder on CentOS, you need to install some packages like belowAnd the easiest way can mount the folder you want will be like belowIn case that you encounter error message like “mount error(12): Cannot allocate memory to th...
How to optimize MySQL automatically in CentOS Linux
I am using CentOS Linux for service purpose. Main reason to use CentOS is cheaper hosting for private purpose. Actually MySQL requires periodical optimization process in my experiences, and I use / etc / cron.hourly usually for those kind of bath processi...
Building a Basic DNS Server in PHP/Python: A Beginner's Guide
Creating a full-fledged DNS server in PHP is not recommended for production environments due to performance and security concerns. DNS servers require low-level networking capabilities and efficient handling of DNS protocol messages, which PHP is not optim...
Dynamic DNS Made Easy: Building a Python-Based Solution
Creating a dynamic DNS (Domain Name System) service in Python involves several components: a server that listens for DNS queries, a database to store mappings between domain names and IP addresses, and functionality to update these mappings dynamically. Be...
Public DNS (Domain Name Service) based on IPv4, IPv6 widely used
In most cases,the Dynamic Host Configuration Protocol (DHCP) automatically configures your system to use the IP addresses of your ISP's domain name servers.To use Public DNS,you need to explicitly change the DNS settings in your operating system or device ...
mysql optimization – if you are using Word Press, do not turn off persistent connection
I am using Virtual Private Hosting service, and I found that my server has some problem as below. As you can see the CPU occupation rate is more than 300%. So my server response speed is the most slower than I had experiences before. I had read some articl...
Apache server unstable detection and the related server(mysql, apache) restart automatically
I am using CentOS with php, and mysql for web service, and sometimes my server is dead by unknown reason so I optimize mysql database and restart web server manually. Following is the first my / etc / cron.hourly / optimze process for seamless servic...
File conversion to UTF in Schell Script
Following code converts EUC-KR format document to UTF8. utfconvert.sh.
How can I increase MySQL max connections?
edit the file / etc / my.cnfThe file should look like this:Increase 100,000 to the number you desire.After the setting is applied, you should restart your database.
SQL to Select a random row from a database table
There are lots of ways to select a random record or row from a database table.Here are some example SQL statements that don't require additional application logic,but each database server requires different SQL syntax.Select a random row with MySQL:Select ...