Webmin is a web-based interface for managing UNIX systems. It has a new web interface where you can modify and manage several things on the computer. For example, user accounts, UNIX groups, DNS and others.

In addition, you will have no license problems with Webmin because it is released under the GPL3 license, which guarantees that you can use it, modify it and install it as you want.

So, let us start.

Installing Webmin on CentOS 8 / RHEL 8 / Oracle Linux 8

Before you start installing Webmin, it is a good idea to update all the operating system packages. To do this, connect to your server using SSH or simply open a terminal session and run:

:~$ su
:~# dnf update

This way your system will have the latest security patches installed. Therefore, it will be a more secure system.

Webmin offers us a repository of packages derived from RHEL 8 that facilitates the installation. So we must add the repository first, and do the installation like this.

So, create a file in /etc/yum.repos.d/webmin.repo and add the following:

 [Webmin]
 name=Webmin Distribution Neutral
 #baseurl=https://download.webmin.com/download/yum
 mirrorlist=https://download.webmin.com/download/yum/mirrorlist
 enabled=1

Then download and add the GPG key to secure the repository. To download it we’ll use wget, but be sure to install it first in case you don’t have it.

:~# dnf install wget

:~# wget http://www.webmin.com/jcameron-key.asc

And then add it with the following command:

:~# rpm --import jcameron-key.asc

After this, we will be able to install Webmin in an easy and simple way as follows:

:~# dnf install webmin

At the end of the installation, we will be able to access the web interface of the program. However, first, you have to open port 10000 which is where the application works.

:~# firewall-cmd --add-port=10000/tcp --zone=public --permanent
:~# firewall-cmd --reload

Now yes, open your favorite web browser and go to http://your-server:10000 and you will see the following:

Now you can log in with a user who has access to sudo or with the root user. Next, you will see the dashboard.

So, enjoy it.

Conclusion

Webmin is an indispensable application if we have a server or equipment that we need to monitor. Of course, it is not the most advanced or the best but it does its functions efficiently without wasting a lot of system resources.

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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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So, let us start.

1. Install Nginx

Of course, the first step is to install Nginx. As we well know, it comes in the official repositories so there is a bigger problem in doing so.

Open a terminal and run:

:~$ su
:~# dnf install nginx

When the installation is finished, the service must be started. It is also recommended to make it start together with the system.

:~# systemctl start nginx
:~# systemctl enable nginx

In order for Nginx to run correctly, it is necessary to open the ports in the Firewall. To do this, run the following:

:~# firewall-cmd --permanent --add-service=http
success
:~# firewall-cmd --reload
success

Now, open your web browser and go to your server. http://server-ip.

So, Nginx is working.

2) Install and configure PHP

The second step is to install PHP which is also in the official repositories.

:~# dnf install php php-fpm php-mysqlnd php-cli

Now you need to configure PHP to work with Nginx. First, edit PHP file.

:~# nano /etc/php.ini

And change the following value:

cgi.fix_pathinfo=0

Next, edit the /etc/php-fpm.d/www.conf file.

And uncomment the following values:

pm.min_spare_servers = 5	 	 
pm.max_spare_servers = 35	 	 

And change the listen values.

listen = 127.0.0.1:9000

Next, save the changes and close the file.

Now, start and enable the PHP-fpm service.

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

3) Create a new Nginx Server Block

Now we will create the new server block. For this also create a folder in /usr/share/nginx/html/ i will name it example.

Inside it, I will make a file called index.php that will only contain a phpinfo method.

:~# mkdir -p /usr/share/nginx/html/example
:~# nano /usr/share/nginx/html/example/index.php

And add the following:

<?php
phpinfo();
?>

Save the changes and close the file.

Now it is necessary to create the configuration file of the new Server Block. Create the file in /etc/nginx/conf.d/ and call it example.conf.

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

And add the following:

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

   location / {
       index index.html index.htm index.php;
   }

   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 file and then close it. Then, restart the services.

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

Now, open your web browser and go to example.local.

And that is it.

Conclusion

To manipulate different applications on the same web server, it is necessary to create a server block for each of them. As you have seen in the post, it is not complicated and allows to

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How to set a static IP address on Centos 8 / RHEL 8 / Oracle Linux

Linux is a fairly flexible system and this results in several ways of doing the same process. In this case, it is the same, we will be able to establish a static IP address in several ways. To avoid unnecessarily lengthening the post, I will only show one single way.

It is advisable to read about static and dynamic IP addresses. This is because it is not always good to have them, although in an internal network it helps a lot to manage the services of that server. Even, at cluster level and related things, it is necessary to assign a specific address to a node.

So, let us start.

Using the Network scripts to set a static IP address

I think this is the most basic way to set a static IP address in CentOS 8, RHEL 8 and Oracle Linux 8. Because this way we will not have to install or use third-party tools to do the configuration. On the other hand, it is a bit rough for newbies.

First of all, you have to know what the network interfaces you have active are called. Let us suppose that we are going to define a static IP address to the ethernet wired network.

So, open a terminal and run the following:

:~$ ip addr show

In the screen output of the command, you will notice that they open several interfaces. In my case, there are only two. The local and another one called enp0s3. That is the one we want to change.

Now open the configuration file of that network interface. I will use nano for it, if you do not have it installed you can do it.

:~$ su
:~# nano /etc/sysconfig/network-scripts/ifcfg-[network-interface]

The content of the file is quite explicit. However, to configure the static IP, it is enough to modify these elements:

TYPE="Ethernet"
BOOTPROTO="none"
NAME="eth0"
IPADDR=192.168.250.105
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
BROADCAST=192.168.255.255
DEVICE="eth0"
ONBOOT="yes"

Also, if you want to use DNS, add these two options.

DNS1=[DNS_SERVER]
DNS2=[DNS_SERVER]

Next, save the changes and close the file.

It is now necessary to reload the networks profile so that the system knows that there have been changes.

:~# nmcli connection reload

Finally, restart the connection.

:~# nmcli con down [network_interface]
:~# nmcli con up [network_interface]

Now, check the new IP address with this command:

:~# ip addr show

So, everything is OK.

Conclusion

In this post, you have learned to set a static IP address in CentOS 8, RHEL 8 and Oracle Linux 8. This way you will be able to manage some servers a little better and it is a very used network function. On the other hand, if you use any of these distributions as a personal system it is probably not useful.

You can also read How to set a static IP address on Debian 10 Buster?

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There are companies today that create websites only available from the business network. Many with the purpose of communicating with workers, or making available resources of the company. At least, in my environment, there are several companies that do it. And they use WordPress to deploy them. So, the utility of having it installed is maximum.

On the other hand, we may want a personal blog on our own server. Either in the cloud or we have the computer physically.

In any case, WordPress which is a CMS is a software that allows you to make websites or blogs quickly and easily. It also manages the publication and realization of page entries. The ability to customize is quite extensive and almost everything can be done without advanced knowledge of HTML or CSS. In fact, most websites are designed with WordPress. This is where their potential lies.

So, let us install WordPress on CentOS, RHEL and Oracle Linux 8.

1) Install LEMP on CentOS, RHEL and Oracle Linux 8

In order to install WordPress, it is first necessary to have a ready and functional web server. In this case, we have opted for Nginx so we will have to have a LEMP server.

But it is not a problem, because we have done a complete tutorial to install LEMP on CentOS, RHEL and Oracle Linux 8.

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

You just have to pay attention to have these PHP modules installed

:~# dnf install php php-fpm php-common php-mysqlnd php-gd php-xml php-mbstring php-xml

Once you have the LEMP server up and running, move on.

2) Create a new database user for WordPress

WordPress requires a database manager to store everything that is happening on the site. But not only that but other things more.

For security reasons, it is advisable to create a new user and database dedicated to WordPress. Then, go to the MariaDB console and type.

:~# mysql -u root -p

> CREATE DATABASE wordpressdb;
> GRANT ALL PRIVILEGES ON wordpressdb.* TO 'wordpressuser'@'localhost' IDENTIFIED BY 'wordpresspss';
> FLUSH PRIVILEGES;
> exit;

Of course, you can define the names you want.

3) Install WordPress on CentOS, RHEL and Oracle Linux (I)

Now we can install WordPress on CentOS / RHEL / Oracle Linux 8. To do this, first, you have to download it using wget. If you do not have it installed, you have to do it first.

:~# cd /tmp/
:~# wget -c https://wordpress.org/latest.tar.gz

Next, decompress the file.

:~# tar -xvzf latest.tar.gz

Now, you have to move the generated folder to /usr/share/nginx/html/. Then, set the right permissions to the folder.

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

Then, restart Nginx.

:~# systemctl restart nginx

4) Install WordPress on CentOS, RHEL, Oracle Linux 8 (II)

Now, open your browser and go your server and complete the installation.

Now, type your DB credentials.

Now, we can start the installation.

Then, type the site information.

If everything went well, you will see the following screen.

Now, you can log in to admin your WordPress instance.

Then, you will see the WordPress dashboard.

And that’s it.

Conclusion

In this post, you learned how to install WordPress on CentOS, RHEL and Oracle Linux 8. This way you can deploy quality websites using a reliable web server like Nginx on a robust operating system like those of the Red Hat family. As you can see, the installation is not complicated.

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LAMP vs LEMP is really Apache vs Nginx

Both software stacks, allow having a fully functional webserver. With this, you can develop and run web applications created with PHP. Obviously, if you install it on a server, they can be run from another computer on the network.

The components of LAMP are Linux – Apache – MySQL/MariaDB – PHP. And they are exactly the same as in LEMP except that Nginx is preferred to Apache.

Also, you can read How to install the LAMP stack on Oracle Linux 8 / RHEL 8 / CentOS8?

Why should you?

Both web servers are very good. Too good. They are open-source, free and the user community provides good support. The detail is that Nginx performs better than Apache. Proven. However, it is less flexible in its configurations.

So let us get to work.

Install LEMP on RHEL 8, CentOS 8 and Oracle Linux 8

1) LEMP on RHEL and CentOS 8: Install Nginx

The first step is to install Nginx. So open a terminal session or connect to your server using SSH.

:~$ su
:~# dnf install nginx

Then you need to start the service.

:~# systemctl start nginx

It is a good idea to have it start with the system, so run this command:

:~# systemctl enable nginx

The next step is to open the ports in the Firewall so that we can use Nginx.

:~# firewall-cmd --add-port=80/tcp --permanent
success
:~# firewall-cmd --add-port=443/tcp --permanent
success
:~# firewall-cmd --reload
success

Finally, open your web browser and go to your server. http://server-ip/ you will see something like this:

So, Nginx is working.

2) Install and configure PHP

The next step is to install PHP. Both Oracle Linux and RHEL, as well as CentOS, come with PHP 7.2 in their official repositories. It is a good version to start working with. So what we have to do is install it along with some of its modules.

:~# dnf install php php-mysqlnd php-fpm php-opcache php-gd php-xml php-mbstring

Then, start and enable the php-fpm service.

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

Once we have started the service, it is necessary to modify some settings to make it work with Nginx.

:~# nano /etc/php-fpm.d/www.conf

At the beginning of the file, look for the user and group parameters. You will find it with the value of apache, change it to nginx.

user = nginx
group = nginx

Then, look for the line that starts with “listen”. And verify that it is as follows.

listen = /run/php-fpm/www.sock

Then, reload the php-fpm service.

:~# systemctl restart php-fpm

Now it’s time to test PHP with Nginx.

Unlike Apache, the Nginx web directory in RHEL, CentOS and Oracle Linux 8 is /usr/share/nginx/html. Then, Nginx should be made the owner of that folder.

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

Then, create a new PHP file to test.

:~# nano /usr/share/nginx/html/test.php
<?php
phpinfo();
?>

After that, restart Nginx.

:~# systemctl restart nginx

Now, open the PHP file using your web browser. http://server-ip/test.php.

So everything is working.

3) Install MariaDB

MariaDB is a pretty good database manager. It is a MySQL fork and therefore compatible with it. It is one of the open-source values. So let us install it.

:~# dnf install mariadb-server

Then, start and enable the service.

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

Now it is necessary to define a password for the root user. In addition to this, the installation must be secured. For this the mysql_secure_installation script is available.

:~# mysql_secure_installation

After defining the root password, you will be asked some configuration questions.

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

Now, LEMP is complete.

Conclusion

The LEMP stack is widely used today because Nginx performs quite well with a lot of traffic. So it’s up to you to choose which one suits your needs.

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OpenJDK vs Oracle Java

Java is open source but its property belongs to Oracle. So, the community, taking advantage that Java is open source, has made a free oracle implementation called OpenJDK. Both do their job but there is more professional support if you use the Oracle version.

So today I will show you how to install both versions of Java on RHEL, CentOS and Oracle Linux 8.

1) Install Java (OpenJDK) on RHEL, CentOS and Oracle Linux 8

In the official distribution repositories, there are two versions of OpenJDK based on Java 8 and Java 11. Choose the one that best suits your needs or simply install both.

For OpenJDK Java 8:

:~$ su
:~# dnf install java-1.8.0-openjdk-devel

But, if you want to install version 11.

:~# dnf install java-11-openjdk-devel

And that is it.

2) Install Oracle Java on RHEL, CentOS and Oracle Linux 8

Downloading the Oracle version on a server is a bit more complicated because for version 11 which is the last LTS, Log in is required. Then, you have to download it on another computer and upload it via FTP to the server.

Once you have done this, install it with the following command:

:~# dnf install [file_path]

On the same Oracle download site, you will be able to choose several versions of Java. However, keep in mind that 11 is the last LTS and is the safest.

3) Set the default Java version

Sometimes it’s a good idea to have several versions of Java installed. This is because there are many programs that although they are created with Java, they know how to make better use of one version than the other.

Then, you have to tell the system which is the default version that the operating system will take. Of course, you can change versions without any problem.

To do this, in the terminal run the following:

:~# alternatives --config java

And write the number corresponding to the Java version you want to leave by default.

Next, check the version Java.

:~# java --version
openjdk 11.0.2 2019-01-15 LTS
OpenJDK Runtime Environment 18.9 (build 11.0.2+7-LTS)
OpenJDK 64-Bit Server VM 18.9 (build 11.0.2+7-LTS, mixed mode, sharing)

And that is it. Enjoy it.

Conclusion

Installing Java on a current operating system is quite easy and necessary. Especially if it is an application server that must be able to run multiple different applications. Today in this post, we have installed Java on RHEL CentOS and Oracle Linux 8.

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The LAMP stack

LAMP is the set of several programs to perform the installation of a basic and functional web server. First of all, it is necessary to have a Linux distribution capable of being stable enough so that it does not fail. Nothing better than Oracle Linux, RHEL or CentOS; then, an HTTP server like Apache, a database manager like MySQL and finally a web-oriented programming language like PHP.

Together they form the LAMP stack and it is basic to run web applications made in PHP as well as to develop new ones.

Install Apache webserver

We are going to install the Apache webserver. Its name is httpd and it is in the official repositories of these Linux distributions. It is the most popular web server out there and most open source projects use it as the basis for their execution.

On the other hand, it is open source and is very well supported by the community.

Open a terminal session or connect to the server using ssh.

:~$ su
:~# dnf install httpd

Then, you need to start the service.

:~# systemctl start httpd

If it is a production or development web server, then, it is a good idea for Apache to run at system startup. To do this, run this command as well:

:~# systemctl enable httpd
Created symlink /etc/systemd/system/multi-user.target.wants/httpd.service → /usr/lib/systemd/system/httpd.service.

Then you have to open port 80 in the firewall. If you plan to use https, then open 443 as well.

:~# firewall-cmd --add-port=80/tcp --zone=public --permanent
success
:~# firewall-cmd --add-port=443/tcp --zone=public --permanent
success
:~# firewall-cmd --reload
success

Now, open your web browser and go to your server. For example, http://server-ip and you will see this.

So, the Apache webserver is running properly.

Second step: PHP

Then you have to install PHP so that the applications can be interpreted. PHP is also in the official repositories, so there will be no problems.

It is also a good idea to install several PHP extensions to extend its functionality.

:~# dnf install php php-common php-pecl-apcu php-cli php-pear php-pdo php-mysqlnd php-pgsql php-gd php-mbstring php-xml

Now, it is time to test it. Create a new file called test.php on /var/www/html and add the following.

:~# nano /var/www/html/test.php

<?php
phpinfo();
?>

Next, restart Apache.

:~# systemctl restart httpd

Now, open the file using the web browser.

Now, Apache and PHP are working.

The last component of the LAMP stack: MySQL

Now the database manager is missing. To do this, we will use MySQL. To install it, run the following command:

:~# dnf install mysql-server
or
:~# dnf install mariadb-server

After installing it, as well as with Apache, start the service. It is also convenient to start the system.

:~# systemctl start mysqld
:~# systemctl enable mysqld
or
:~# systemctl start mariadb
:~# systemctl enable mariadb

However, the MySQL root password has not been defined and the installation has not been secured. To do this, run the following command:

:~# mysql_secure_installation

Then, after defining the root password, you will be asked other questions related to the security of the program.

Remove anonymous users? [Y/n] Y 
Disallow root login remotely? [Y/n] Y
Remove test database and access to it? [Y/n] Y
Reload privilege tables now? [Y/n] y

Now, you can start to create the databases you want.

Conclusion

The LAMP stack is something fundamental in a modern server. Therefore, it is important to have it installed and configured correctly and run web applications. In this post, you have learned to install it in Oracle Linux 8, RHEL 8 and CentOS 8.

You can also read how to install LAMP on Debian 10 Buster?

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