This snap includes ha_cluster_exporter to provide Pacemaker-based HA cluster statistics via Prometheus. Grafana dashboards can then be used to visualize the exported metrics.
How-To
How to install the snap:
sudo snap install hacluster-exporter
The snap starts ha_cluster_exporter as a daemon automatically and exposes
metrics on :9664/metrics by default.
How to use the service:
Configure Prometheus to scrape http://<cluster-node>:9664/metrics.
For the most complete cluster visibility, run the snap on each cluster node.
The exporter inspects the local node on each scrape and exposes Pacemaker, Corosync, SBD, and DRBD metrics when those components are available.
Reference
Default runtime values:
web.listen-address: the address on which the exporter exposes metrics.
The default is :9664.web.telemetry-path: the HTTP path on which metrics are exposed.
The default is /metrics.This snap currently starts the exporter with the upstream defaults and does not expose additional snap configuration options.
Links
Upstream ha_cluster_exporter repository
https://github.com/ClusterLabs/ha_cluster_exporter
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Snaps are applications packaged with all their dependencies to run on all popular Linux distributions from a single build. They update automatically and roll back gracefully.
Snaps are discoverable and installable from the Snap Store, an app store with an audience of millions.
Snap is available for Red Hat Enterprise Linux (RHEL) 8 and RHEL 7, from the 7.6 release onward.
The packages for RHEL 7, RHEL 8, and RHEL 9 are in each distribution’s respective Extra Packages for Enterprise Linux (EPEL) repository. The instructions for adding this repository diverge slightly between RHEL 7, RHEL 8 and RHEL 9, which is why they’re listed separately below.
The EPEL repository can be added to RHEL 9 with the following command:
sudo dnf install https://dl.fedoraproject.org/pub/epel/epel-release-latest-9.noarch.rpm
sudo dnf upgrade
The EPEL repository can be added to RHEL 8 with the following command:
sudo dnf install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
sudo dnf upgrade
The EPEL repository can be added to RHEL 7 with the following command:
sudo rpm -ivh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
Adding the optional and extras repositories is also recommended:
sudo subscription-manager repos --enable "rhel-*-optional-rpms" --enable "rhel-*-extras-rpms"
sudo yum update
Snap can now be installed as follows:
sudo yum install snapd
Once installed, the systemd unit that manages the main snap communication socket needs to be enabled:
sudo systemctl enable --now snapd.socket
To enable classic snap support, enter the following to create a symbolic link between /var/lib/snapd/snap and /snap:
sudo ln -s /var/lib/snapd/snap /snap
Either log out and back in again or restart your system to ensure snap’s paths are updated correctly.
To install HA Cluster Exporter, simply use the following command:
sudo snap install hacluster-exporter --classic
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