How To Install Ntopng on AlmaLinux 9

In this guide, we want to teach you How To Install Ntopng on AlmaLinux 9.

Introduction To Ntopng

Ntopng is a network top program that lets admins display all the relevant parameters for the connected networks. It is a passive network monitoring tool that supports statistical evaluation of traffic data on the connected networks; it does not actively intervene in the network traffic (but see the “Layer 7 Manipulation” box). Ntopng is therefore ideally suited as a tool for administrators wanting to answer, among others, the following questions:

  • What devices are currently on the network?
  • How much traffic do the various devices cause on the network?
  • Which devices are communicating or exchanging data with others (internally and externally)?
  • What kind of bandwidth is used by each device, or which device is currently hogging the Internet connection?
  • What protocols exist on the network, and how is network traffic distributed among them?
  • Is any suspicious data traffic on the network caused by, for example, viruses or Trojans?

Ntopng is ideally suited for monitoring small and medium-sized Class C networks at gigabit speeds but can also be used for monitoring larger networks, given appropriate hardware.

Steps To Install Ntopng on AlmaLinux 9

To complete this guide, you must log in to your server as a root user with sudo privileges and set up a basic firewall. To do this, you can follow our guide the Initial Server Setup with AlmaLinux 9.

Add Ntopng Repository

As you know, Ntopng packages aren’t available in the default AlmaLinux repository.

First, you need to add the Ntop packages repository with the following command:

curl > /etc/yum.repos.d/ntop.repo

Then, you need to install the Epel repository on your server:

dnf install epel-release -y

Now you need to add the Remi repository to your server with the following command:

rpm -ivh

Next, install the dnf plugins on AlmaLinux 9:

dnf install dnf-plugins-core -y

Use the following commands to enable the power tools and Remi repository:

# dnf config-manager --set-enabled remi

powertools are called crb(CodeReady Linux Builder) now. To enable it, run

dnf config-manager --set-enabled crb

Update your local package index:

dnf update -y

Installing Ntopng Monitoring Tool on AlmaLinux 9

At this point, you can install the Ntopng and its dependencies  with the following command:

dnf install pfring-dkms n2disk nprobe ntopng cento -y

Note: PF_RING is now packaged without ZC drivers so you can optionally install them:

dnf install pfring-drivers-zc-dkms

Most software work without licenses. However, some components do need a license. They include:

  • PF_RING ZC user-space libraries
  • nProbe (NetFlow/IPFIX probe)
  • n2disk (packet to disk application)

If you are a nProbe user and want to install a nProbe package with no dependency, please install the nProbes (rather than the nProbe) package. Note that you can either install the nProbe or the nProbes package but NOT both simultaneously.

Now start and enable your Ntopng service on AlmaLinux 9 with the following command:

systemctl enable --now ntopng

Verify your service is active and running:

systemctl status ntopng
● ntopng.service - ntopng high-speed web-based traffic monitoring and analysis >
     Loaded: loaded (/usr/lib/systemd/system/ntopng.service; enabled; vendor pr>
     Active: active (running) since Sun 2022-10-02 06:21:44 EDT; 2s ago
    Process: 36766 ExecStartPre=/bin/sh -c /usr/bin/ntopng-utils-manage-config >
    Process: 36780 ExecStartPre=/bin/sh -c /bin/cat /etc/ntopng/ntopng.conf > />
    Process: 36782 ExecStartPre=/bin/sh -c /bin/cat /etc/ntopng/ntopng.conf.d/*>
    Process: 36784 ExecStartPre=/bin/sh -c /bin/sed "/^[ ]*-e.*$\|^[ ]*-G.*\|^[>
   Main PID: 36786 (ntopng)
      Tasks: 7 (limit: 23609)
     Memory: 37.3M
        CPU: 542ms
     CGroup: /system.slice/ntopng.service
             └─36786 /usr/bin/ntopng /run/ntopng.conf

Access Ntopng Dashboard

Ntopng by default listens on port 3000. You need to open the Ntopng port through ALmaLinux 9 firewall with the following command:

firewall-cmd --permanent --add-port=3000/tcp

Reload the firewall to apply the new rules:

firewall-cmd --reload

At this point, you can access the Ntopng web interface by typing your server’s IP address in your web browser followed by 3000:


You will see the Ntopng login screen. Use the default credentials: admin:admin and reset the password afterward.

Ntopng login screen

Now you can change the default password and press change password.

Change default password of Ntopng

At this point, you will see your Ntopng dashboard.

Ntopng dashboard


At this point, you learn to Install Ntopng on AlmaLinux 9.

Hope you enjoy it.

For more guides and articles, you can visit the Orcacore Website.


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