Prometheus Installation on Linux using Ansible-playbook

Introduction :

Installation of Prometheus on different instances is very time-consuming. Instead of manual installation, we make it easy using Ansible-playbook.

Tools:

• AWS Account

• Ansible

Getting your hands dirty!

• First, create an AWS ec-2 instance with a Linux image and create a new or add an existing security group. After creation make sure you can log in using a security key (make sure your ssh port 22 is open). Add port "9090" for the Prometheus server.

  

• Add created Linux instance IP into an Ansible hosts file. I use [prometeus] as a hostname in the inventory file.

  In ansible_ssh_private_key_file we have to specify the full path of the inventory file.

    [prometheus]
    13.232.52.98 ansible_user=ec2-user ansible_ssh_private_key_file=/home/Downloads/mydtkey.pem
  

• You can check using the below code whether your host is reachable or not :

    ansible all -m ping -i /home/Downloads/Ansible_files/hosts.in
  

• Ansible-playbook for installation and configuration for systemd "Prometheus.service" :

  promtheus_install.yaml :

    - hosts:  prometheus
      user:   ec2-user
      become: yes
  
      tasks:
        - name: change ownership to ec2-user
          command: chown -R ec2-user:ec2-user /opt  
  
        - name: Download prometheus archive #dowloading prometheus and unarchive 
          unarchive: 
            src: https://github.com/prometheus/prometheus/releases/download/v2.37.8/prometheus-2.37.8.linux-amd64.tar.gz
            dest: /opt
            remote_src: yes
            owner: ec2-user
  
        - name: change name of extracted folder 
          command: "mv /opt/prometheus-2.37.8.linux-amd64  /opt/prometheus"
  
        - name: copy prometheus to /usr/local/bin/ #copy folder to bin for execution
          copy: 
            src: /opt/prometheus/prometheus
            dest: /usr/local/bin/
            remote_src: yes 
            mode: '0755'
  
        - name: copy promtool to /usr/local/bin/
          copy: 
            src: /opt/prometheus/promtool
            dest: /usr/local/bin/
            remote_src: yes    
            mode: '0755'
  
        - name: change ownership to ec2-user #changing ownership to ec2-user
          command: chown -R ec2-user:ec2-user /usr/local/bin/prometheus
  
        - name: change ownership of promtool
          command: chown -R ec2-user:ec2-user /usr/local/bin/promtool 
  
        - name: copy consoles from prometheus to /etc/promethus/
          copy: 
            src: /opt/prometheus/consoles 
            dest: /etc/prometheus/
            remote_src: yes
  
        - name: copy console_libraries from prometheus to /etc/promethus/
          copy: 
            src: /opt/prometheus/console_libraries 
            dest: /etc/prometheus/
            remote_src: yes
  
        - name: copy prometheus.yml from prometheus to /etc/promethus/
          copy: 
            src: /opt/prometheus/prometheus.yml
            dest: /etc/prometheus/
            remote_src: yes
  
        - name: change ownership to ec2-user
          command: chown -R ec2-user:ec2-user /etc/prometheus/
  
        - name: create prometheus.service in /etc/systemd/system/prometheus.service 
          file: 
            path: /etc/systemd/system/prometheus.service
            state: touch 
            mode: '0755'
  
        - name : paste content in service file 
          copy: 
            dest: /etc/systemd/system/prometheus.service
            content: | 
              [Unit]
              Description=Prometheus
              Wants=network-online.target
              After=network-online.target          
  
              [Service]
              User=root
              group=root
              ExecStart=/usr/local/bin/prometheus --config.file=/etc/prometheus/prometheus.yml          
  
              [Install]
              WantedBy=multi-user.target
  
        - name: reload systemd 
          command: systemctl daemon-reload 
  
        - name: start prometheus #starting the prometheus service 
          command: systemctl start prometheus
  

• Now time to run our playbook:

    ansible-playbook prometheus_install.yaml -i /home/Downloads/Ansible_files/hosts.ini
  

Output :

Prometheus :

Conclusion:

This article covers the installation of Prometheus with the help of Ansible and AWS ec2 instance.

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