If you didn’t know, GCC is the compiler for the C language provided by the GNU project. With GCC we can use the C language on our computer but also with it we can create or run other applications like libraries.

The mythical GCC is one of the basic tools for compiling and building packages. Present in almost every Linux distribution out there, it is the basis for many processes in building a distribution.

Some people need for whatever reason to have the latest stable version of GCC. That is why we have prepared this post as simple as possible so that anyone can do it.

Install the latest version of GCC using Homebrew

Of all the ways we have to achieve this goal, maybe Homebrew is the one that makes it the easiest. So let’s take advantage of this extraordinary tool to achieve our goal.

The first step then is to install Homebrew on Ubuntu 20.04 / Debian 10 after that we can continue without any problems.

The next step is to simply run the brew command to install GCC, the latest version of which is 11.1.

brew install gcc

Then the whole download and installation process will start. If everything went well, you will see the following output on the screen.

To check that GCC is installed, you can display the version.

gcc-11 --version

In case you already have GCC installed globally, then you can go to the folder where the binary is and run

cd /home/linuxbrew/.linuxbrew/Cellar/gcc/11.1.0_1/bin
./gcc-11 --version

Sample Output

gcc-11 (Homebrew GCC 11.1.0_1) 11.1.0
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

So, enjoy it.

Conclusion

GCC is so common that sometimes we overlook it, but it is always good to have the latest stable version that can get us out of trouble at any time.

The post Install the latest version of GCC on Ubuntu 20.04? appeared first on Linux Windows and android Tutorials.

Cacti is an open source monitoring tool which covers network as well as graphing.  It was designed to provide an easy way to monitor your system on industry-standard data logging tool -RRDtoll.Cacti is an important tool to harnesses the power of RRDtool’s storage and functionality of graphing. Cacti is user-friendly and easy to use for managing network monitoring and configurations. Some dependencies needed to install Cacti on Centos 8.

Here are some important features of Cacti. 

• User Management

•  Advanced graphing templates

•  Data acquisition methods in multiple formats

• Faster polling of metrics 

Why we need monitoring?

 Monitoring is a main feature of any infrastructure. In order to look over your systems that what’s going on it’s best way to use some tools like Cacti to monitor.

 So, in this tutorial we will cover the cacti installation and its related modules.

Step 1: How to Install build tools and system dependencies. 

First of all install all development tools and gcc tools for system dependencies.

After it install Gcc & Development Tools

Now install SNMP packages

Step 2: Install php and required extensions. 

sudo dnf install -y net-snmp net-snmp-utils rrdtool

Install PHP and its extension as it is required.

sudo dnf install @php
sudo dnf install -y php php-{mysqlnd,curl,gd,intl,pear,recode,ldap,xmlrpc,snmp,mbstring,gettext,gmp,json,xml,common}

Make sure PHP is installed version is correct and loaded modules.

Now edit this file /etc/php.ini file.

$ grep date.timezone /etc/php.ini
; http://php.net/date.timezone
date.timezone = Africa/Nairobi

Set PHP memory limit to 400M

memory.limit = 400M;

Start php-fpm service.

sudo systemctl enable –now php-fpm

Make sure status is working.

Step 3: How to install Apache Web Server. 

Type given command to Install Apache httpd server.

sudo dnf install @httpd

Now, enable Apache services.

sudo systemctl enable –now httpd

Verify that Apache is running properly.

Make sure to give firewall permissions on https ports.

sudo firewall-cmd –add-service={http,https} –permanent
sudo firewall-cmd –reload

Step 4: Install and configure database server.

If you’ve already installed a Database Server let’s start with that. If you don’t have install MySQL or MariaDB database server.
When you’ve done installation of any database Server follow the next steps.
Let’s create a database alongwith user for Cacti.

$ mysql -u root -p
CREATE DATABASE cacti;
GRANT ALL ON cacti.* TO ‘cacti’@’localhost’ IDENTIFIED BY ‘StrongDBPassword’;
FLUSH PRIVILEGES
exit

Set up tuning MariaDB database
Do settings with this file /etc/my.cnf.d/mariadb-server.cnf in [mysqld] section.
Restart mariadb service after setting upon according to your own requirements.

sudo systemctl restart mariadb

Step 5: Download and Configure Cacti. 

Create a directory and download the latest release of Cacti in it.

mkdir cacti && cd cacti
curl -SL https://www.cacti.net/downloads/cacti-latest.tar.gz | tar –strip 1 -xzf –

Now move the created folder to /var/www/html directory.

cd ..
sudo mv cacti/ /var/www/html/

Import database data.

mysql -u root -p cacti < /var/www/html/cacti/cacti.sql

Make sure timezone setting is done.

mysql_tzinfo_to_sql /usr/share/zoneinfo | mysql -u root -p mysql

Give Cacti user access to timezone database.

Configure SELinux.

sudo semanage fcontext -a -t httpd_sys_rw_content_t “/var/www/html/cacti(/.*)?”
sudo restorecon -Rv /var/www/html/cacti

Now again restart Apache service to attain modifications.

sudo systemctl restart httpd php-fpm

Now the last step is to configure cacti.
Access the file /var/www/html/cacti/include/config.php.
Set up database connection parameters according to your own requirements.

Create a log file for Cacti system.

tocuh /var/www/html/cacti/log/cacti.log

Grant directory Permissions.

sudo chown -R apache:apache /var/www/html/cacti

Setup cron job.

sudo crontab -u apache -e

Add following line in above line.

*/5 * * * * php /var/www/html/cacti/poller.php > /dev/null 2>&1

Step 6: Access Cacti Installation wizard. 

You can visit this link http://[ServerIP/Hostname]/cacti to enter into Installation Wizard.

Change the default credentials.

Now make sure to change the password.

Accept Licencse Agreement and proceed.

Make sure to have all options green.

Choose your installation type.

Verify Directory Permission Checks.

Check out all binaries located & move further.

Choose your required option.

Choose the template you want.

Make sure settings are okay.

Confirm Installation.

After a while installation process will be completed.

Step 7: Monitor Linux Servers with Cacti

Let’s start & enable snmpd daemon to start.

sudo systemctl enable –now snmpd

Make sure it’s working properly.

Now add the linux server for monitoring.

Login as Cacti admin to see the process.

Console>Create>New Device

Now give server details & save configuration.

Congratulations! You’ve all done.
If have any question about this tutorial leave a comment.

The post How to Install Cacti on Centos / RHEL 8 appeared first on Linux Windows and android Tutorials.

RHEL is the best one for developing critical application also it is stable and secure Server Operating System.
For Security reasons some package are pre-installed.
For developing purposes on Centos 8 or RHEL 8 you must have installed the following development tools:

• autoconf
• automake
• gcc
• gcc-c++
• bison
• flex
• binuts
• gdb
• glibc-devel
• libtool
• make
• pkgconf
• pkgconf-m4
• pkgconf-pkg-config
• redhat-rpm-config
• rpm-build
• rpm-sign
• strace

Some other tools are also available in new version like centos 8 with python 3 pre installed and other tools.
You can install missing development tools by following this guide step by step:

How to list groups on Centos / RHEL 8?

Run this command to list package installed on your Centos 8.

$ dnf group list

By running this command give below, you can easily access the summary of your installed groups as well as available groups.

$ sudo dnf groups summary

Installing GCC and Development Tools on Centos / RHEL 8 Server

Type the following command to get started your installation.

$ sudo dnf group install “Development Tools”
or
$ sudo dnf groupinstall “Development Tools”

For viewing information about Development Tools type the following command:

$ sudo dnf group info “Development Tools”

Make sure installation is complete by checking tools binary location.

Also check the installed version.

$ gcc –version

$ make –version

How to Unistall GCC & Development Tools on Centos / RHEL 8.

Follow this command to remove a package group on Centos / RHEL 8.

$ sudo dnf group remove “Development Tools”

To avoid breaking other packages, be keen on dependency.
Test GCC Compiler
Let’s create a file to test weather it is working or not.
Consider this file to show hello world

$ cat hello.c
#include
int main() {
print(“hello, world!\n”);
return 0;
}

Compile this file with GCC.

$ gcc hello.c -o helloworld

Now run this file to see what’s the output?

$ ./helloworld

Congratulations You’ve all done!
If you’ve any issue regarding this tutorial, leave a comment we will get to you ASAP to help you solve your issue.

The post How to Install GCC & Development Tools on Centos 8 / RHEL 8 appeared first on Linux Windows and android Tutorials.