### Install prometheus on a node with active manager
```
wget https://github.com/prometheus/prometheus/releases/download/v2.22.0/prometheus-2.22.0.linux-amd64.tar.gz
useradd --no-create-home --shell /bin/false prometheus
mkdir /etc/prometheus
mkdir /var/lib/prometheus
chown prometheus:prometheus /etc/prometheus
chown prometheus:prometheus /var/lib/prometheus
tar -xvzf prometheus-2.22.0.linux-amd64.tar.gz 
mv prometheus-2.22.0.linux-amd64 prometheuspackage
cp prometheuspackage/prometheus /usr/local/bin/
cp prometheuspackage/promtool /usr/local/bin/
chown prometheus:prometheus /usr/local/bin/prometheus
chown prometheus:prometheus /usr/local/bin/promtool
cp -r prometheuspackage/consoles /etc/prometheus
cp -r prometheuspackage/console_libraries /etc/prometheus
chown -R prometheus:prometheus /etc/prometheus/consoles
chown -R prometheus:prometheus /etc/prometheus/console_libraries
vim /etc/prometheus/prometheus.yml

global:
  scrape_interval: 10s

scrape_configs:
  - job_name: 'prometheus_master'
    scrape_interval: 5s
    static_configs:
      - targets: ['localhost:9283']

chown prometheus:prometheus /etc/prometheus/prometheus.yml
vim /etc/systemd/system/prometheus.service

[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

systemctl daemon-reload
systemctl start prometheus
```
Enable the prometheus module
```
ceph mgr module enable prometheus
```
Import dashboards from
```
https://github.com/ceph/ceph/tree/master/monitoring/grafana/dashboards
```