The inotify-tools can be used to watch a directory or file for activity and take an action when a file is changed, added, edited or simply read. You can find a workaround (or call it solution) for the absence of the inotify-tools in the repositories here.
Sometimes, for various reasons, a directory needs to be watched for new files, file changes, etc. When a change occurs, a certain action should be taken, like copying the files elsewhere or send an email with to notify someone of the changes. There are a lot of such imaginable scenarios to think of. Read More
Tag: centos
Install mod_pagespeed (Website Optimizer) for Apache in CentOS
mod_pagespeed is an open source module for Apache web server that automatically optimize Web Pages to improve better performance while serving web pages using Apache HTTP Server. It has several filters that automatically optimize files like HTML, CSS, JavaScript, JPEG, PNG and other resources.
Step 1: Enabling Google’s mod_pagespeed Repository
Create a file called /etc/yum.repos.d/mod-pagespeed.repo with the help of your favourite editor and add the following lines of code to it based on your OS bit. Read More
How To Create an SSL Certificate on Apache for CentOS 7
Introduction
TLS, or “transport layer security”, and its predecessor SSL, which stands for “secure sockets layer”, are web protocols used to wrap normal traffic in a protected, encrypted wrapper. Using this technology, servers can send traffic safely between the server and the client without the concern that the messages will be intercepted and read by an outside party. The certificate system also assists users in verifying the identity of the sites that they are connecting with.
In this guide, we will show you how to set up a self-signed SSL certificate for use with an Apache web server on a CentOS 7 VPS. A self-signed certificate will not validate the identity of your server, since it is not signed by a trusted certificate authorities, but it will allow you to encrypt communications between your server and your visitors.
Use PostgreSQL on CentOS 7
Create a New Role
From the postgres Linux account, you have the ability to log into the database system. However, we’re also going to demonstrate how to create additional roles. The postgres Linux account, being associated with the Postgres administrative role, has access to some utilities to create users and databases.
We can create a new role by typing:
- createuser –interactive
This basically is an interactive shell script that calls the correct Postgres commands to create a user to your specifications. It will only ask you two questions: the name of the role and whether it should be a superuser. You can get more control by passing some additional flags. Check out the options by looking at the man page:
- man createuser
Install PostgresQL Centos 7
PostgreSQL (pronounced ‘post-gres-Q-L’) is a free, open-source object-relational database management system (object-RDBMS), similar to MySQL, and is standards-compliant and extensible. It is commonly used as a back-end for web and mobile applications. PostgreSQL, or ‘Postgres’ as it is nicknamed, adopts the ANSI/ISO SQL standards together, with the revisions.
1. Install PostgreSQL
yum install postgresql.x86_64 postgresql-server
PostgreSQL should now be installed. Read More
How To Use Cron To Automate Tasks
Installation
Almost all distros have a form of cron installed by default. However, if you’re using a system that doesn’t have it installed, you can install it with the following commands:
For Ubuntu/Debian:
apt-get update
apt-get install cron
For Cent OS/Red Hat Linux:
yum update
yum install vixie-cron crontabs
You’ll need to make sure it runs in the background too:
chkconfig crond on
service crond start
How To Install MySQL / MariaDB on CentOS 7
MariaDB is a drop-in replacement for MySQL. It is easy to install, offers many speed and performance improvements, and is easy to integrate into most MySQL deployments. Answers for compatibility questions can be found at: MariaDB versus MySQL – Compatibility. MariaDB offers more storage engines than MySQL, including Cassandra (NoSQL, in MariaDB Version 10), XtraDB (drop-in replacement for InnoDB), and OQGRAPH (in MariaDB Version 10).
Pre-Flight Check
- These instructions are intended for installing MariaDB on a single CentOS 7 node.
- I’ll be working from a Liquid Web Self Managed CentOS 7 server, and I’ll be logged in as root.
CentOS 7 reset mysql password
Set / change / reset the MySQL root password on Linux. Enter the following lines in your terminal.
Step # 1 : Stop mysql service
systemctl stop mariadb
Step # 2: Start to MySQL server w/o password:
mysqld_safe –skip-grant-tables &
Step # 3: Connect to mysql server using mysql client:
mysql -u root Read More
How to install OTRS 4 on CentOS 7
In this post I’m going to walk you through installing OTRS 4 on CentOS 7. The procedure will be very similar for Red Hat Enterprise Linux (RHEL) version 7 as this is binary compatible.
Please note that there are some differences between CentOS 6 and CentOS 7: it now ships with systemd and with firewalld so the instructions to install OTRS are pretty different.
Setting up your production server or migrating from one is something you don’t want to do every day. This means you better take a distribution that will receive security upgrades for a long time. This is why I would recommend CentOS version 7 over version 6 at this point in time. Read More