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Installing Prometheus Alertmanager

Prometheus alerts allow you to issue automated notifications when certain events occur, triggered by your metric data. Alertmanager is a necessary component in this process, handling the process of sending alerts to the appropriate destination, as well as adding some additional control over alerting functionality. In this lab, you will have the opportunity to install and configure an Alertmanager instance, and connect it to an existing Prometheus server.

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Path Info

Clock icon Intermediate
Clock icon 45m
Clock icon Jun 12, 2020

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Table of Contents

  1. Challenge

    Install Alertmanager

    1. Log in to the Prometheus server.

    2. Create a user and group for Alertmanager:

      sudo useradd -M -r -s /bin/false alertmanager
    3. Download and install the Alertmanager binaries:

      tar xvfz alertmanager-0.20.0.linux-amd64.tar.gz
      sudo cp alertmanager-0.20.0.linux-amd64/alertmanager /usr/local/bin/
      sudo chown alertmanager:alertmanager /usr/local/bin/alertmanager
      sudo mkdir -p /etc/alertmanager
      sudo cp alertmanager-0.20.0.linux-amd64/alertmanager.yml /etc/alertmanager
      sudo chown -R alertmanager:alertmanager /etc/alertmanager
      sudo mkdir -p /var/lib/alertmanager
      sudo chown alertmanager:alertmanager /var/lib/alertmanager
    4. Create a systemd unit for Alertmanager:

      sudo vi /etc/systemd/system/alertmanager.service
      Description=Prometheus Alertmanager
        --config.file /etc/alertmanager/alertmanager.yml 
        --storage.path /var/lib/alertmanager/
    5. Start and enable the alertmanager service:

      sudo systemctl enable alertmanager
      sudo systemctl start alertmanager
    6. Verify the service is running and you can reach it:

      sudo systemctl status alertmanager
      curl localhost:9093
    7. You can also access Alertmanager in a web browser at http://<PROMETHEUS_SERVER_PUBLIC_IP>:9093.

  2. Challenge

    Install `amtool`

    1. Install the amtool binary:

      sudo cp alertmanager-0.20.0.linux-amd64/amtool /usr/local/bin/
    2. Create a config file for amtool:

      sudo mkdir -p /etc/amtool
      sudo vi /etc/amtool/config.yml
    3. Enter the following content in the config file:

      alertmanager.url: http://localhost:9093
    4. Verify amtool is working by pulling the current Alertmanager configuration:

      amtool config show
  3. Challenge

    Configure Prometheus to Use Alertmanager

    1. Edit the Prometheus config:

      sudo vi /etc/prometheus/prometheus.yml
    2. Under alerting, add your Alertmanager as a target:

        - static_configs:
          - targets: ["localhost:9093"]
    3. Restart Prometheus to reload the configuration:

      sudo systemctl restart prometheus
    4. Verify Prometheus is able to reach the Alertmanager. Access the Prometheus Expression Browser in a web browser at http://<PROMETHEUS_SERVER_PUBLIC_IP>:9090/graph. Run the following query and ensure the current value is 1:


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