Install PostgreSQL 13 on CentOS 8 / RHEL 8 / Oracle Linux 8

Both RHEL 8 and its derivatives include PostgreSQL 10 in their repositories. However, we already have available version 13. And it is recommended to install it because thanks to it, we can enjoy interesting news and improvements in the performance of the application. Important, if we are going to store large quantities of records.

So first, open a terminal session. Or if you are using a server connect to it using ssh.

:~$ ssh [your-user]@[your-host]

Then log in as the root user.

:~$ su
:~#

The best way to install PostgreSQL 13 on CentOS 8, RHEL 8 and Oracle Linux 8 is to add the official PostgreSQL refill. Not only is it easy, but also safe and the possibility to be always up to date.

To do this, run the following command:

:~# dnf install https://download.postgresql.org/pub/repos/yum/reporpms/EL-8-x86_64/pgdg-redhat-repo-latest.noarch.rpm

Then, disable the PostgreSQL module on CentOS 8.

:~# dnf module disable postgresql

Now, install PostgreSQL 13 on CentOS 8.

:~# dnf install postgresql13-server postgresql13

After that, let us configure it.

Configure PostgreSQL on CentOS / RHEL 8 / Oracle Linux 8

Initialize PostgreSQL database and start the service

After installing it, the first thing to do is to initialize the database. To achieve this, it is necessary to execute the following command:

:~# /usr/pgsql-13/bin/postgresql-13-setup initdb
Initializing database ... OK

With this, we will have already started the initial database. At this point, the PostgreSQL service is not enable, so you can’t use it yet. Then you have to do it.

:~# systemctl enable postgresql-13

Then, if you want PostgreSQL to start along with the system run this command:

:~# systemctl start postgresql-13

To check that everything is going well, check the status of the service:

:~# systemctl status postgresql-13

As you can see, everything’s fine.

Change the password to the “postgres” user and allow the remote connections

During the installation of PostgreSQL, a new user called postgres is created. The problem is that you do not define a password, so it makes you vulnerable. To avoid problems, it is convenient to create a password.

To do this, just use the Unix passwd command.

:~# passwd postgres

There you will have to enter the password twice. If both are effective, the final change will be made.

Now, we have to allow access to remote connections. The client must be installed on each of the systems that will access PostgreSQL. It will depend on each operating system.

Then, a good security measure is to specify the hosts that can access it. Of course, if the data will be served on the Internet, then it is necessary to allow all the accesses.

:~# nano /var/lib/pgsql/13/data/postgresql.conf

then searches for the listen_addresses line and places the hosts that can access it. If you allow any access, type ‘*’.

listen_addresses = '[host/IP_adress]'
or
listen_addresses = '*'

Then, restart PostgreSQL.

:~# systemctl restart postgresql-13

Finally, you have to open the port 5432 on the firewall to allow the connections.

:~# firewall-cmd --add-port=5432/tcp --permanent
success
:~# firewall-cmd --reload
success

Now, you can access to the PostgreSQL shell.

:~# su - postgres
:~# psql

Now, you can start to work.

Conclusion

PostgreSQL is one of the best there is for databases. Thanks to its community spirit, it is possible to find a lot of documentation about it. On the other hand, installing version 13 on CentOS 8, RHEL 8 and Oracle Linux 8 is quite simple as you have seen in this post.

Also, you can read how to install Postgresql on Ubuntu 18.04?

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GLPI in a few words

The GLPI is an application of French origin that provides an integral management of the
an organization’s computer inventory. But not only is it limited to this, but also
also includes an incidence ticket system.

As expected is open source and is developed with PHP. Therefore, what is required is a web server with Apache or nginx as processors. In addition, to store the data, you need MySQL or MariaDB. As you can see, these are requirements of a server.

Install CentOS 8 / RHEL 8 / Oracle Linux 8

As it is an application built for web environments, it is necessary to have a fully functional server. To do this, I will choose Nginx as my HTTP server along with with PHP and MariaDB. That is to say a LEMP server.

Then, the first step is to install a LEMP server on CentOS 8 / RHEL 8 / Oracle. So I invite you to read our about this where we explain you step by step how to do it.

Read How to install LEMP on CentOS 8 / RHEL 8 / Oracle Linux 8?

Prepare MariaDB to work with GLPI

Now that we have the LEMP server running, it is necessary to create a New user and database for GLPI. This is quite simple but we must enter as root user to the MariaDB console.

:~# mysql –u root –p
> CREATE DATABASE glpidb;
> GRANT ALL PRIVILEGES ON glpidb.* TO 'glpiuser'@'localhost' IDENTIFIED BY 'glpipss';
> FLUSH PRIVILEGES;
> Exit;

Creating a user dedicated to GLPI other than root is a security measure important.

Download and Install GLPI on CentOS 8 / RHEL 8 / Oracle Linux

Now we can download and install the GLPI. To do this, just download it using wget. If you don’t have it installed, you can do it with the following command:

:~# dnf install wget

Then navigate to the tmp folder and download it.

:~# cd /tmp/
:~# wget -c https://github.com/glpi-project/glpi/releases/download/9.4.3/glpi-9.4.3.tgz

Next, decompress it and move to the nginx document root:

:~# tar xvf glpi-9.4.3.tgz 
:~# mv glpi /usr/share/nginx/html/

After that, change the permissions on the folder so that it can be runned correctly:

:~# chmod 755 -R /usr/share/nginx/html/
:~# chown nginx:nginx -R /usr/share/nginx/html/

Create a new server block to GLPI on CentOS 8 / RHEL 8 / Oracle Linux 8 (Optional)

Now it is necessary to create a new server block for Glpi. In this case, also we have a tutorial for it.

Read, How to create an Nginx server block on CentOS 8 / RHEL 8 / Oracle Linux 8?

Then, we will be able to complete the installation.

Install GLPI on CentOS / RHEL / Oracle Linux 8 using the web interface

Now all that’s left is to complete the installation using the web interface. To do this, go to
to your server and you will see the following image:

Then, choose the language of the installation and accept the license terms.

Then, you can either update a previous installation or start a clean one. Choose the install option.

Then, the installer will check the server for any problems.

Now, you will have to write the MariaDB credentials. Click on the Next option.

Then, if the connection to the database has been successful, you will see the following:

Finally, if everything went well, you will see a message like this:

To enter the GLPI dashboard use glpi as user and glpi password.

This is the main screen of the application.

Conclusion

The Glpi is one of those necessary applications in an organization that wants to have everything a competent computer inventory. In addition to incorporating a reporting system of Incidents, ensures prompt attention to users of systems and equipment of the
company.

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What is Zabbix?

Zabbix is quite a wonder. It is an open-source application that works under the client-server architecture. In other words, when installed on any server, it requires an agent to be installed on the client computers. In this way, the application will be able to monitor all the behavior of the nodes as well as the performance of the network.

On the other hand, the development of Zabbix is quite positive and constant, which makes it quite safe and functional. In addition to being quite mature in its development supports several database management systems including the popular MariaDB, MySQL, PostgreSQL or proprietary alternatives such as Oracle and IBM DB2.

In this post, we will install step by step the Zabbix server on CentOS 8 / RHEL 8 / Oracle Linux 8.

Install Zabbix on CentOS 8 / RHEL 8 / Oracle Linux 8

As expected, Zabbix has precompiled binaries available for RHEL 8 and derivatives. These are available from the official repository, but there are some prerequisites we must meet. One of them is that we need a web server running on our computer. Besides that, a database management system like MariaDB.

Install LAMP on CentOS 8 / RHEL 8 / Oracle Linux 8

In this case, we have a complete tutorial where you can install LAMP on CentOS 8 / RHEL 8 / Oracle Linux 8. There, step by step, you will be able to get a web server running as well as the database manager MariaDB.

Read, How to install LAMP on CentOS 8 / RHEL 8 / Oracle Linux 8?

Create the Zabbix user on MariaDB

Once the server is running correctly. It is necessary to create a new user and database for Zabbix. To do this, open the MySQL console and run:

:~# mysql -u root -p 
> CREATE DATABASE zabbixdb;
> GRANT ALL PRIVILEGES ON zabbixdb.* TO 'zabbixuser'@'localhost' IDENTIFIED BY 'zabbixpss';
> FLUSH PRIVILEGES;
> exit;

Install Zabbix on CentOS 8 / RHEL 8 / Oracle Linux 8 (I)

Then we can install Zabbix without problems. We will achieve this by using the official Zabbix repository for RHEL 8.

So as a root user, run the following command to add the GPG key from the repository:

:~# rpm --import http://repo.zabbix.com/RPM-GPG-KEY-ZABBIX

Then add the repository as such:

:~# rpm -ivh https://repo.zabbix.com/zabbix/4.0/rhel/8/x86_64/zabbix-release-4.0-2.el8.noarch.rpm

Then proceed to install the Zabbix packages.

:~# dnf install zabbix-server-mysql zabbix-web-mysql zabbix-agent zabbix-get zabbix-sender zabbix-java-gateway

If you want you can modify the PHP timezone on the Zabbix configuration file.

:~# nano /etc/httpd/conf.d/zabbix.conf

Uncomment the line date.timezone and add your timezone.

php_value date.timezone [TIMEZONE]

The next step is to load the initial Zabbix database.

:~# zcat /usr/share/doc/zabbix-server-mysql*/create.sql.gz | mysql -u zabbixuser -p zabbixdb

Then, it is necessary to specify the database parameters in the Zabbix configuration file.

:~# nano /etc/zabbix/zabbix_server.conf

In this file, you have to modify the following values

DBHost:localhost
DBName=[DB_name]
DBUser=[Mariadb_zabbix_user]
DBPassword=[Password]

Save the changes and close the file. The next step is to open the Zabbix ports in the Firewall so that it can run smoothly.

:~# firewall-cmd --permanent --add-port=10050/tcp
success
:~# firewall-cmd --permanent --add-port=10051/tcp
success
:~# firewall-cmd --reload
success

Finally, start the service. If you want Zabbix to run at system startup, you can add these commands:

:~# systemctl enable zabbix-server
:~# systemctl start zabbix-server
:~# systemctl restart httpd

Install Zabbix on CentOS 8 / RHEL 8 / Oracle Linux 8 (II)

The last thing we need to do before we have our Zabbix server running is to complete the installation using the web browser. Open it and go to http://your-server/ you will see this

Then, the installer will check the prerequisites.

Now, we have to set the parameters of the database that we have previously defined.

Then, set up some server details.

In the end, you will see the summary and the message that Zabbix has been successfully installed.

After finishing the process, you will see the login screen. Log in with admin as user and zabbix as password.

Finally, you will see the dashboard. And that is it.

Install the Zabbix agent on the nodes

In order for Zabbix to monitor correctly, it is necessary to install the agents in each of the nodes. Probably, they use different operating systems, so the installation can vary in each of them.

First, you have to add the Zabbix repository for each system. In case you use Ubuntu 18.04:

:~$ wget https://repo.zabbix.com/zabbix/4.0/ubuntu/pool/main/z/zabbix-release/zabbix-release_4.0-2+bionic_all.deb
:~$ sudo dpkg -i zabbix-release_4.0-2+bionic_all.deb
:~$ sudo apt update

Then, install Zabbix with the following command:

:~$ sudo apt install zabbix-agent

If you use CentOS 8, add the repository with this command:

:~# rpm -ivh https://repo.zabbix.com/zabbix/4.0/rhel/7/x86_64/zabbix-release-4.0-2.el7.noarch.rpm

Then, install the agent with the following command:

:~# yum install zabbix zabbix-agent

Finally, if you use Debian 9:

:~$ wget https://repo.zabbix.com/zabbix/4.0/debian/pool/main/z/zabbix-release/zabbix-release_4.0-2+stretch_all.deb
:~# dpkg -i zabbix-release_4.0-2+stretch_all.deb
:~# apt update

And you install it with the command:

:~$ apt install zabbix-agent

Conclusion

Zabbix is an important application in any network service. Thanks to it it is possible to do complete monitoring on the operation of the same one. It also verifies the state of the nodes. In this post, you have learned to install it on the server-side.

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As time goes by, the versions of the programs that come in the repositories of the Linux distributions become old. Similarly, program developers often release new versions with new features or bug fixes and we miss them.

Git is a program with quite active development and that requires to be always updated to have news and security fixes. So it is better to do it. And the best way to do it is to compile the source code of the application yourself.

Let us get started.

The latest version of GIT on CentOS 8 / RHEL 8 / Oracle Linux 8

Open a terminal and log in as root user, in case you do not have sudo. Then, install all the tools to compile and build from the source code.

:~$ su
:~# dnf groupinstall "Development Tools"

Then, it is necessary to install some packages that will help us with the process.

:~# dnf install wget unzip curl

Now it is necessary to install some libraries necessary for Git compilation.

:~# dnf install curl-devel expat-devel gettext-devel openssl-devel zlib-devel perl-CPAN perl-devel

Now, we can start to download Git using wget.

:~# wget https://github.com/git/git/archive/v2.23.0.zip -O latestgit.zip

Then, unzip it. And access the folder.

:~# unzip latestgit.zip
:~# cd git-2.23.0/

After that, configure the source before starting the compilation.

:~# make configure
:~# ./configure --prefix=/usr/local

Then, run the make command.

:~# make all

Now, start the installation.

:~# make install

And that is it. Git is installed. If you want to check, you can use the Git command to display the current version.

:~# git --version

So, enjoy it.

Conclusion

Git is a pretty good version control system. It is one of the best. And by the way, if we combine it with a powerful Linux distribution like CentOS 8 or RHEL 8 or Oracle Linux 8, it is better used. Now that you know how to install its latest stable version, it’s time to make the most of it.

Also, you can learn to install Git on Debian 10? or Ubuntu 18.04.

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What is the EPEL repository?

The Extra Packages for Enterprise Linux (EPEL) is an unofficial repository that provides a variety of packages that are not in the official RHEL and derivative repositories. It is quite reliable and secure, so it is highly recommended to enable it if we need any packages available in this repository.

Keep in mind that Linux distirbutions such as RHEL and its derivatives, as well as Debian, Ubuntu and SUSE, incorporate packages tested by them. In this immense effort, there are many very good packages that cannot be added to the repositories.

For that reason, these repositories are born, to be able to install many extra packages without much effort… let us get to work.

Enable the EPEL repository on CentOS 8 / RHEL 8 / Oracle Linux 8

The EPEL project is fantastic. Not only because of the large number of packages available but also because of the ease of use. To add it, you have to download and install an RPM package that they put at our disposal.

So, open a terminal and upgrade the system.

:~$ sudo dnf update

This way we will have all the packages updated with the built-in security patches.

Now install the repository configuration package with the following command:

:~$ sudo dnf install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm

Then, check that everything is OK with the new repository. So, list all the enabled repository.

:~$ sudo dnf repolist -v

As you can see in the image, the repository was correctly added. That is to say, we will be able to use it.

You can see all available packages with the following command:

:~$ sudo dnf repository-packages epel list

The image above shows that there are many packages available to be installed thanks to the EPEL repository.

Conclusion

In conclusion, adding the EPEL repository is almost an obligation if we want to counter many extra packages for our distribution. On the other hand, EPEL is a safe, reliable and easy to enable repository. To be so simple, the benefits are many.

Also, you can read How to enable Sudo on Debian 10?

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A little bit of ArangoDB

ArangoDB is a NoSQL database manager. It is built in C++ and is open source. Its main feature is that it is multi-model. That is, it supports different data models such as (JSON), graphs and key-value.

On the other hand, ArangoDB has two versions. The first one is paid and offers support at different levels. The second is communitarian, ideal for small or educational projects.

If you want to manage a server instance easily, ArangoDB allows it through a nice and intuitive web interface. Besides this, it has connectors for many programming languages, so this should not be a limitation. Of course, it has installers for many Linux distributions.

So let us get to work.

Install ArangoDB on CentOS 8 / RHEL 8 / Oracle Linux 8

ArangoDB is an application that takes documentation very seriously. In fact, it is a very well documented application that makes it easy to work with. And the installation process is available to many systems through its repository.

So the first step to install ArangoDB on CentOS 8 / RHEL 8 / Oracle Linux 8 is to add the repository.

Open a terminal and run the following:

:~$ su
:~# cd /etc/yum.repos.d/

Then, import the GPG key to secure the repository addition.

:~# curl -OL https://download.arangodb.com/arangodb35/RPM/arangodb.repo

After this, you can install ArangoDB by typing the following command:

:~# dnf install arangodb3-3.5.0

Now that ArangoDB is installed, you have to do some configuration before using it.

Making some configuration before using ArangoDB on CentOS 8 / RHEL 8 / Oracle Linux 8

ArangoDB is already installed but does not have a key configured for the root user. As we know, this is vital because then, anyone can access the stored data.

So use the following command to set the password for the root user:

:~# arango_secure_installation

With this you can now enter the ArangoDB shell and start working:

:~# systemctl start arangodb3
:~# arangosh

One of the most outstanding potentials of ArangoDB is its web interface. Thanks to it, it is possible to administer the instance quickly and easily. In addition to visualizing the data in a better way.

So, open the file /etc/arangodb3/arangod.conf. At the beginning of the file, it changes the endpoint value and adds the IP address of the computer where ArangoDB is running. By default, it is configured for localhost. There you will also see the default port used by the application which is 8529.

:~# nano /etc/arangodb3/arangod.conf

This same process must be done in the file /etc/arangodb3/arangosh.conf.

:~# nano /etc/arangodb3/arangosh.conf

For all this to work, it is necessary to add the corresponding rules in the Firewall. Specifically, open port 8529. Then, restart ArangoDB.

:~# firewall-cmd --add-port=8529/tcp --permanent
success
:~# firewall-cmd --reload
success
:~# systemctl restart arangodb3

Now, you can access to the web interface using your web browser. Go to http://your-server:8529

Type your credentials and click on the Login button. You will have to select the database.

Finally, you will see the dashboard. And you can start to work.

And that is it.

Conclusion

ArangoDB is a very popular database manager and increasingly influential in the world of programming. It is frequently used in IoT technology as well as in mobile phones. As you could see, it is easy to install and thus saves us a lot of work.

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Install Nextcloud on CentOS 8 / RHEL 8 / Oracle Linux 8

Nextcloud is a web application built with PHP. Then we will have to configure a web server for it. So we’ll install Nginx + PHP + MariaDB. But we will also create a Server block for it.

So let’s go for it.

1) Install Nginx and PHP

So, the first step is to install Nginx and PHP. Let’s start with Nginx. Open a terminal and run the following:

:~$ su
:~# dnf install nginx

Then, start and enable the service. Next, add a firewall rule to allow access to Nginx.

:~# systemctl start nginx
:~# systemctl enable nginx
:~# firewall-cmd --permanent --add-service=http
success
:~# firewall-cmd --permanent --add-port=9000/tcp
:~# firewall-cmd --reload
success

Now, you can open the web browser and go to http://your-server. You will see something like this:

Now, you need to install PHP. So, run the following command:

:~# dnf install php php-mysqlnd php-intl php-curl php-json php-gd php-xml php-mbstring php-zip php-fpm php-cli

Now, on the file /etc/php.ini change the following value:

:~# nano /etc/php.ini
cgi.fix_pathinfo=0

Then, save the changes and close the file. On the file /etc/php-fpm.d/www.conf changes these values:

:~# nano /etc/php-fpm.d/www.conf
user = nginx
group = nginx 
pm.min_spare_servers = 5	 	 
pm.max_spare_servers = 35
listen = 127.0.0.1:9000

Again, save the changes and close the file. After that, start the php-fpm service and restart the Nginx service by running the following commands:

:~# systemctl start php-fpm
:~# systemctl enable php-fpm
:~# systemctl restart nginx

So, Nginx and PHP are working fine.

2) Install and configure MariaDB

Now it is necessary to install MariaDB because Nextcloud requires a database manager. To do this, run the following command:

:~# dnf install mariadb-server

Then, start and enable the service.

:~# systemctl enable mariadb
:~# systemctl start mariadb

After that, you need to set a root password for MariaDB. You can do it by using the mysql_secure_installation script. Moreover, you can secure the installation.

:~# mysql_secure_installation

And answer the following question:

Remove anonymous users? Y
Disallow root login remotely? Y
Remove test database and access to it? Y
Reload privilege tables now? Y

Now, create a new user and database for Nextcloud. So, access to the MariaDB console. Next, run the following commands:

:~# mysql -u root -p
> CREATE DATABASE nextcloud;
> GRANT ALL PRIVILEGES ON nextcloud.* TO 'nextclouduser'@'localhost' IDENTIFIED BY 'nextcloudpss';
> FLUSH PRIVILEGES;
> exit;

Now, you can install Nextcloud.

3) Install MariaDB on CentOS 8 / RHEL 8 / Oracle Linux 8

Now we can start the installation. Make sure to install wget and unzip. Then, use it to start the download.

:~# cd /tmp/
:~# wget -c https://download.nextcloud.com/server/releases/nextcloud-16.0.3.zip

Then, decompress the folder. Move it to the Nginx document root and set the right permissions.

:~# unzip nextcloud-16.0.3.zip
:~# mv nextcloud /usr/share/nginx/html/
:~# chown -R nginx:nginx /usr/share/nginx/html/
:~# chmod 755 -R /usr/share/nginx/html/

Now, we need to create a new Server Block for Nextcloud.

:~# nano /etc/nginx/conf.d/nextcloud.local.conf

And add the following:

server {
   server_name nextcloud.local;
   root /usr/share/nginx/html/nextcloud;

   location / {
       index index.html index.htm index.php;
       rewrite ^ /index.php$request_uri;
   }
   
   location ~ \.php$ {
      include /etc/nginx/fastcgi_params;
      fastcgi_pass 127.0.0.1:9000;
      fastcgi_index index.php;
      fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
   }
}

Save the changes and close the file.

Finally, restart the Nginx and the PHP-fpm services.

:~# systemctl restart nginx
:~# systemctl restart php-fpm

4) Install Nextcloud on CentOS 8 / RHEL 8 / Oracle Linux 8 (II)

So, complete the installation using the web browser. And you will see this:

So, type your MariaDB credentials and start the installation.

When the installation is finished, you will see the following screen.

After that, you can start to use Nextcloud.

So, that is it.

Conclusion

Nextcloud is one of those applications that are necessary for any company. Because it is possible to create a private cloud with all the features of the most popular services. Nextcloud even has clients for other platforms such as Android and iOS.

So, you can also read how to install Nextcloud on Debian 10?

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