Perform the following steps:

1. Log in to the Prometheus guest instance:

vagrant ssh prometheus

2. Inside the guest instance, drop to the root:

sudo -i

3. Add all the guests' addresses to the instance host's file:

cat <<EOF >/etc/hosts
127.0.0.1       localhost
192.168.42.10   prometheus.prom.inet    prometheus
192.168.42.11   grafana.prom.inet       grafana
192.168.42.12   alertmanager.prom.inet  alertmanager


# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
EOF

4. Create a new system user:

useradd --system prometheus

5. Go into /tmp and download the Prometheus archive:

cd /tmp
curl -sLO "https://github.com/prometheus/prometheus/releases/download/v2.9.2/prometheus-2.9.2.linux-amd64.tar.gz"

6. Uncompress the archive:

tar zxvf prometheus-2.9.2.linux-amd64.tar.gz

7. Place every file in its correct location:

install -m 0644 -D -t /usr/share/prometheus/consoles prometheus-2.9.2.linux-amd64/consoles/*

install -m 0644 -D -t /usr/share/prometheus/console_libraries prometheus-2.9.2.linux-amd64/console_libraries/*

install -m 0755 prometheus-2.9.2.linux-amd64/prometheus prometheus-2.9.2.linux-amd64/promtool /usr/bin/

install -d -o prometheus -g prometheus /var/lib/prometheus   

install -m 0644 -D /vagrant/chapter03/configs/prometheus/prometheus.yml /etc/prometheus/prometheus.yml

install -m 0644 -D /vagrant/chapter03/configs/prometheus/first_rules.yml /etc/prometheus/first_rules.yml

8. Add a systemd unit file for the Prometheus service:

install -m 0644 /vagrant/chapter03/configs/prometheus/prometheus.service /etc/systemd/system/

systemctl daemon-reload

9. Enable and start the Prometheus service:

systemctl enable prometheus
systemctl start prometheus

You should now have the Prometheus HTTP endpoint available on your host.

10. Exit the root account and then the Vagrant user account:

exit

exit