ansible/roles/prometheus/templates/nginx.conf.j2

# {{ ansible_managed }}

upstream prometheus_backend {
    server 127.0.0.1:{{ prometheus_port }};
}

upstream alertmanager_backend {
    server 127.0.0.1:{{ alertmanager_port }};
}

upstream karma_backend {
    server 127.0.0.1:{{ karma_port }};
}

server {
    listen 80;
{% if ansible_all_ipv6_addresses | length %}
    listen [::]:80;
{% endif %}
    server_name {{ prometheus_hostname }};

    access_log /var/log/nginx/prometheus.access.log main;
    error_log /var/log/nginx/prometheus.error.log warn;

    location /.well-known/acme-challenge/ {
        root /var/www/html;
        try_files $uri =404;
    }

{% if prometheus_ssl_enabled is defined and
      prometheus_ssl_enabled %}
    location / {
        return 301 https://$server_name$request_uri;
    }
{% endif %}
}

{% if prometheus_ssl_enabled is defined and
      prometheus_ssl_enabled %}
server {
    listen 443 ssl;
{% if ansible_all_ipv6_addresses | length %}
    listen [::]:443 ssl;
{% endif %}

    http2 on;

    server_name {{ prometheus_hostname }};

    auth_basic           "Prometheus";
    auth_basic_user_file {{ prometheus_htpasswd_path }};

    access_log /var/log/nginx/prometheus.access.log main;
    error_log /var/log/nginx/prometheus.error.log warn;

{% if prometheus_ssl_certificate is defined %}
    ssl_certificate {{ prometheus_ssl_certificate }};
{% endif %}
{% if prometheus_ssl_certificate_key is defined %}
    ssl_certificate_key {{ prometheus_ssl_certificate_key }};
{% endif %}
{% if prometheus_ssl_dhparam is defined %}
    ssl_dhparam {{ prometheus_ssl_dhparam }};
{% endif %}

    location /prometheus/ {
        proxy_pass http://prometheus_backend/;
    }

    location /alertmanager/ {
        proxy_pass http://alertmanager_backend/;
    }

    location /karma/ {
        proxy_pass http://karma_backend/;
    }

    location / {
        add_header Alt-Svc 'h3=":$server_port"; ma=86400';
        return 301 /prometheus/;
    }
}
{% endif %}