Install & Setup Alertmanager On Amazon Linux, CentOS & RHEL

Create the alertmanager system user:

sudo useradd --no-create-home --shell /bin/false alertmanager

Create the /etc/alertmanager directory:
```
sudo mkdir /etc/alertmanager
```

Download Alertmanager from the Prometheus downloads page:

cd /tmp/
wget https://github.com/prometheus/alertmanager/releases/download/v0.16.1/alertmanager-0.16.1.linux-amd64.tar.gz

Extract the files:

tar -xvf alertmanager-0.16.1.linux-amd64.tar.gz

Move the binaries:

cd alertmanager-0.16.1.linux-amd64
sudo mv alertmanager /usr/local/bin/
sudo mv amtool /usr/local/bin/

Set the ownership of the binaries:

sudo chown alertmanager:alertmanager /usr/local/bin/alertmanager
sudo chown alertmanager:alertmanager /usr/local/bin/amtool

Move the configuration file into the /etc/alertmanager directory:
```
sudo mv alertmanager.yml /etc/alertmanager/
```

Set the ownership of the /etc/alertmanager directory:

sudo chown -R alertmanager:alertmanager /etc/alertmanager/

Create the alertmanager.service file for systemd:

sudo vim /etc/systemd/system/alertmanager.service

Copy and Paste content:

[Unit]
Description=Alertmanager
Wants=network-online.target
After=network-online.target

[Service]
User=alertmanager
Group=alertmanager
Type=simple
WorkingDirectory=/etc/alertmanager/
ExecStart=/usr/local/bin/alertmanager \
    --config.file=/etc/alertmanager/alertmanager.yml
[Install]
WantedBy=multi-user.target

Save and exit.

Stop Prometheus, and then update the Prometheus configuration file to use Alertmanager:

sudo systemctl stop prometheus
sudo $EDITOR /etc/prometheus/prometheus.yml

alerting:
  alertmanagers:
  - static_configs:
    - targets:
      - localhost:9093

Reload systemd, and then start the prometheus and alertmanager services:

sudo systemctl daemon-reload
sudo systemctl start prometheus
sudo systemctl start alertmanager

Make sure alertmanager starts on boot:
```
sudo systemctl enable alertmanager
```
Visit PUBLICIP:9093 in your browser to confirm Alertmanager is working.

Install & Setup Alertmanager On Amazon Linux, CentOS & RHEL

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