Prometheus Installation

What i explain in this post

  • Install Prometheus service
  • Start the service wit systemd
  • Keep it sercure wit nginx

Prerequisites

Server centos7 minimal

VPS 2G RAM 1 VCPU

Update OS end install minimal tool, turn off Selinux

yum update -y && yum install wget vim bash-completion git -y
setenforce 0

Installation

Add user witout root privilege prometheus 

# Utente di sistema, senza home, impediamo al utente di fare login
sudo adduser prometheus --system \
                   --no-create-home \
                   --shell /sbin/nologin

cd /tmp

We can download the binary file from official website https://prometheus.io/download/

Check the last version end extract the file

wget https://github.com/prometheus/prometheus/releases/download/v1.4.1/prometheus-1.4.1.linux-amd64.tar.gz
tar -zxvf prometheus-1.4.1.linux-amd64.tar.gz

sudo mkdir /opt/prometheus

sudo mv prometheus-1.4.1.linux-amd64 /opt/prometheus/prometheus

Rename the dir to Prometheus end fix the permission

chown -R prometheus:prometheus /opt/prometheus

Systemd Unit

# vim /etc/systemd/system/prometheus.service

[Unit]
Description=Prometheus server
After=network.target

[Service]
WorkingDirectory=/opt/prometheus/prometheus
PermissionsStartOnly=true
ExecStartPre=/bin/chown -R prometheus:prometheus /opt/prometheus/prometheus
User=prometheus
ExecStart=/opt/prometheus/prometheus/prometheus \
        -config.file=/opt/prometheus/prometheus/prometheus.yml \
        -alertmanager.url=http://localhost:9093/alert-manager \

Restart=always
[Install]
WantedBy=multi-user.target

Keep the unit available, start Prometheus

systemctl daemon-reload
systemctl start prometheus.service && systemctl status prometheus.service
systemctl enable prometheus.service

This is the result

[root@prometheus ~]# systemctl start prometheus.service && systemctl status prometheus.service
● prometheus.service - Prometheus server
   Loaded: loaded (/etc/systemd/system/prometheus.service; disabled; vendor preset: disabled)
   Active: active (running) since lun 2016-10-10 21:06:18 UTC; 15ms ago
  Process: 18120 ExecStartPre=/bin/chown -R prometheus:prometheus /opt/prometheus/prometheus (code=exited, status=0/SUCCESS)
 Main PID: 18123 (prometheus)
   CGroup: /system.slice/prometheus.service
           └─18123 /opt/prometheus/prometheus/prometheus -config.file=/opt/prometheus/prometheus/prometheus.yml -alertmanager.url=http://localhost:9093/alert-manager

ott 10 21:06:18 prometheus systemd[1]: Starting Prometheus server...
ott 10 21:06:18 prometheus systemd[1]: Started Prometheus server.


[root@prometheus ~]# systemctl enable prometheus.service
Created symlink from /etc/systemd/system/multi-user.target.wants/prometheus.service to /etc/systemd/system/prometheus.service.

Now keep it in security wit nginx

yum -y install epel-release
yum -y install nginx httpd-tools

Create htpasswd file

htpasswd -c /etc/nginx/htpasswd.users admin

Edit the nignx conf this is my conf.

vi /etc/nginx/nginx.conf

 

# For more information on configuration, see:
#   * Official English Documentation: http://nginx.org/en/docs/
#   * Official Russian Documentation: http://nginx.org/ru/docs/

user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;

# Load dynamic modules. See /usr/share/nginx/README.dynamic.
include /usr/share/nginx/modules/*.conf;

events {
    worker_connections 1024;
}

http {
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile            on;
    tcp_nopush          on;
    tcp_nodelay         on;
    keepalive_timeout   65;
    types_hash_max_size 2048;

    include             /etc/nginx/mime.types;
    default_type        application/octet-stream;

    # Load modular configuration files from the /etc/nginx/conf.d directory.
    # See http://nginx.org/en/docs/ngx_core_module.html#include
    # for more information.
    include /etc/nginx/conf.d/*.conf;
}

Add file in conf.d

vim /etc/nginx/conf.d/prometheus.conf
server {
    listen 80;

    server_name prometheus.greco.cf;

    auth_basic "Restricted Access";
    auth_basic_user_file /etc/nginx/htpasswd.users;

location / {
        proxy_pass http://localhost:9090;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }
}

Check Nginx conf

nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

Start nginx daemon

systemctl restart nginx.service && systemctl status nginx.service
systemctl enable nginx.service

Install firewalld

yum install firewalld
systemctl start firewalld && systemctl enable firewalld && systemctl status firewalld

Configure firewalld

firewall-cmd --zone=public --add-service=https --permanent
firewall-cmd --reload

In your preference firewalld, iptables other is the same keep open http port configure you DNS or your /etc/hosts.