Add Basic Authentication to the Prometheus User Interface

Video Lecture

Add Basic Authentication to the Prometheus User Interface Add Basic Authentication to the Prometheus User Interface


Everything is great so far, but anybody in the world with the internet access and the URL can visit my Prometheus server and see my data.

To solve this problem, we will add user authentication.

We will use Basic Authentication.

SSH onto your server and CD into your /etc/nginx folder.

cd /etc/nginx

Then install apache2-utils (on ubuntu) or httpd-tools (on centos)

#on ubuntu
sudo apt install apache2-utils

#on centos
sudo yum install httpd-tools

Now we can create a password file. In the command below, I am creating a user called 'admin'.

htpasswd -c /etc/nginx/.htpasswd admin

I then enter a password for the user.

Next open the Nginx Prometheus config file we created.

sudo nano /etc/nginx/sites-enabled/prometheus

And add the two authentication properties in the examples below to the existing Nginx configuration file we have already created.

server {

    #addition authentication properties
    auth_basic  "Protected Area";
    auth_basic_user_file /etc/nginx/.htpasswd;

    location / {
        proxy_pass           http://localhost:9090/;


Save and test the new configuration has no errors

nginx -t

Restart Nginx

sudo service nginx restart
sudo service nginx status

Since port 9090 and 9100 are still open, we should block them for external connections.

iptables -A INPUT -p tcp -s localhost --dport 9090 -j ACCEPT
iptables -A INPUT -p tcp --dport 9090 -j DROP
iptables -A INPUT -p tcp -s localhost --dport 9100 -j ACCEPT
iptables -A INPUT -p tcp --dport 9100 -j DROP
iptables -L


iptables settings will be lost in case of system reboot. You will need to reapply them manually,


install iptables-persistent

sudo apt install iptables-persistent

This will save your settings into two files called,



Any changes you make to the iptables configuration won't be auto saved to these persistent files, so if you want to update these files with any changes, then use the commands,

iptables-save > /etc/iptables/rules.v4

iptables-save > /etc/iptables/rules.v6