Centos7 installation and configuration prometheus

centos7 installation and configuration prometheus

Update system & disable selinux

yum update -y
sed -i 's/SELINUX=enforcing/SELINUX=disabled/g'/etc/sysconfig/selinux
# reboot 

Download the prometheus installation package##

• Go to the official website to download the relevant software package: https://prometheus.io/download/

# Execute the following command to download
wget https://github.com/prometheus/prometheus/releases/download/v2.12.0/prometheus-2.12.0.linux-amd64.tar.gz

Configure prometheus

• Add user prometheus

useradd --no-create-home --shell /bin/false prometheus

• Create the necessary directories

mkdir /etc/prometheus
mkdir /var/lib/prometheus

• Change directory permissions

chown prometheus:prometheus /etc/prometheus
chown prometheus:prometheus /var/lib/prometheus

• Move to the directory where Prometheus was downloaded and unzip Prometheus

tar -xvzf prometheus-2.8.1.linux-amd64.tar.gz
mv prometheus-2.8.1.linux-amd64 prometheuspackage

• Copy the "prometheus" and "promtool" binary files from the "prometheuspackage" folder to "/usr/local/bin"

cp prometheuspackage/prometheus /usr/local/bin/
cp prometheuspackage/promtool /usr/local/bin/

• Change the owner of prometheus/promtool

chown prometheus:prometheus /usr/local/bin/prometheus
chown prometheus:prometheus /usr/local/bin/promtool

• Copy the "consoles" and "console_libraries" directories from "prometheuspackage" to "/etc/prometheus folder"

cp -r prometheuspackage/consoles /etc/prometheus
cp -r prometheuspackage/console_libraries /etc/prometheus

• Change ownership to Prometheus user

chown -R prometheus:prometheus /etc/prometheus/consoles
chown -R prometheus:prometheus /etc/prometheus/console_libraries

• Add and modify Prometheus configuration files

vim /etc/prometheus/prometheus.yml

# Add the following configuration to the file
global:
 scrape_interval: 10s

scrape_configs:- job_name:'prometheus_master'
 scrape_interval: 5s
 static_configs:- targets:['localhost:9090']

# Change file ownership
chown prometheus:prometheus /etc/prometheus/prometheus.yml      

• Configure Prometheus service

vim /etc/systemd/system/prometheus.service

# Copy the following to the file
[ Unit]
Description=Prometheus
Wants=network-online.target
After=network-online.target

[ Service]
User=prometheus
Group=prometheus
Type=simple
ExecStart=/usr/local/bin/prometheus \
- - config.file /etc/prometheus/prometheus.yml \
- - storage.tsdb.path /var/lib/prometheus/ \
- - web.console.templates=/etc/prometheus/consoles \
- - web.console.libraries=/etc/prometheus/console_libraries

[ Install]
WantedBy=multi-user.target

• Reload systemd service & start

systemctl daemon-reload
# start up
systemctl start prometheus
# Check status
systemctl status prometheus

• If necessary, add firewall rules

firewall-cmd --zone=public--add-port=9090/tcp --permanent
systemctl reload firewalld

Visit Prometheus Web Interface##

• Use the following Url to access the UI

http://Server-IP:9090/graph

Use Prometheus to monitor Linux servers##

• Prometheus node exporter needs to be configured on the Linux server

# download
wget https://github.com/prometheus/node_exporter/releases/download/v0.17.0/node_exporter-0.17.0.linux-amd64.tar.gz

• Unzip node_exporter and perform related configuration

tar -xvzf node_exporter-0.17.0.linux-amd64.tar.gz

# For node_exporter create user
useradd -rs /bin/false nodeusr

# Move binary files
mv node_exporter-0.17.0.linux-amd64/node_exporter /usr/local/bin/

• Create a service file for the node exporter

vim /etc/systemd/system/node_exporter.service

# Add the following to the file
[ Unit]
Description=Node Exporter
After=network.target

[ Service]
User=nodeusr
Group=nodeusr
Type=simple
ExecStart=/usr/local/bin/node_exporter

[ Install]
WantedBy=multi-user.target

• Reload the system daemon

systemctl daemon-reload
systemctl start node_exporter
systemctl enable node_exporter

• If necessary, add firewall rules

firewall-cmd --zone=public--add-port=9100/tcp --permanent
systemctl restart firewalld

• View the URL of the exporter of the indicator browser node

http://IP-Address:9100/metrics

• Add the configured node exporter Target on Prometheus Server

vim /etc/prometheus/prometheus.yml

# Add the following configuration under scrape configuration
 - job_name:'node_exporter_centos'
 scrape_interval: 5s
 static_configs:- targets:['10.94.10.209:9100']

• Restart Prometheus service

systemctl restart prometheus

• Log in to the Prometheus server web interface and check the target

http://Prometheus-Server-IP:9090/targets