Increasing Prometheus storage retention

Question

Hi I have Prometheus server installed on my AWS instance but the data is been removed automatically after 15 days. I need to have data for an year or months, is there anything I need to change in my prometheus configuration? Or do I need any extensions like Thanos, I am new to Prometheus so please be easy on the answers

Answer 1

1. Edit the prometheus.service file

vi /etc/systemd/system/prometheus.service

2. add "--storage.tsdb.retention.time=1y" below to "ExecStart=/usr/local/bin/prometheus \" line.

So the config will look like bellow for 1 year of data retention.

[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 \     --web.external-url=http://34.89.26.156:9090 \     --storage.tsdb.retention.time=1y [Install] WantedBy=multi-user.target 

Answer 2

There's the --storage.tsdb.retention.time flag that you can set when you start Prometheus. It defines how long data is kept in the time-series database (TSDB). The default is 15 days.

So, to increase the retention time to a year, you should be able to set this to something like:

--storage.tsdb.retention.time=1y # or --storage.tsdb.retention.time=365d 

See the Prometheus documentation.