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README_LOKI.md

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Installing loki

In this doc the loki server will be installed on the same machine than the grafana and prometheus services, but this is not mandatory. loki is located in the PackageHub and in the main openSUSE Leap repos.

zypper in loki

💡 By default Loki only accepts 7-days old log entries. This could be a issue to analyze older logs for L3 support cases. This can be modified by increasing the value of reject_old_samples_max_age in /etc/loki/loki.yaml.

In order to persist Loki's data:

mkdir /var/lib/loki
chown loki:loki /var/lib/loki
sed -i 's/\/tmp\/loki/\/var\/lib\/loki/' /etc/loki/loki.yaml

For now loki has no authentication mechanism.

Start Loki:

systemctl enable --now loki

Installing promtail

promtail is a daemon scraping the logs and feeding them to loki. We need to install it on the server to get its logs.

On SLES, add the PackageHub repos. On openSUSE there is nothing to add.

Install using zypper and give more rights to the loki users to read the logs:

zypper in promtail
usermod -a -G root,salt,www,systemd-journal loki

Copy the promtail.yaml configuration file to the /etc/loki/ folder of the server and adjust:

  • The client URL to point to your loki server
  • The location of the timestamp stages to match the timezone of the server

Start the promtail daemon:

systemctl enable --now promtail

In order to ensure that promtail is up an running, point a browser to http://:9081/targets.

Setup grafana

Open the Grafana, Data sources configuration page and add a Loki data source with URL http://localhost:3100.

As an example upload the dashboard json file in loki folder. It is a copy of the regular Uyuni dashboard with logs added to it.