okd/roles/openshift_health_checker/openshift_checks/etcd_volume.py

"""A health check for OpenShift clusters."""

from openshift_checks import OpenShiftCheck


class EtcdVolume(OpenShiftCheck):
    """Ensures etcd storage usage does not exceed a given threshold."""

    name = "etcd_volume"
    tags = ["etcd", "health"]

    # Default device usage threshold. Value should be in the range [0, 100].
    default_threshold_percent = 90
    # Where to find etcd data
    etcd_mount_path = "/var/lib/etcd"

    def is_active(self):
        etcd_hosts = (
            self.get_var("groups", "oo_etcd_to_config", default=[]) or
            self.get_var("groups", "oo_masters_to_config", default=[]) or
            []
        )
        is_etcd_host = self.get_var("ansible_host") in etcd_hosts
        return super(EtcdVolume, self).is_active() and is_etcd_host

    def run(self):
        mount_info = self.find_ansible_mount(self.etcd_mount_path)
        available = mount_info["size_available"]
        total = mount_info["size_total"]
        used = total - available

        threshold = self.get_var(
            "etcd_device_usage_threshold_percent",
            default=self.default_threshold_percent
        )

        used_percent = 100.0 * used / total

        if used_percent > threshold:
            device = mount_info.get("device", "unknown")
            mount = mount_info.get("mount", "unknown")
            msg = "etcd storage usage ({:.1f}%) is above threshold ({:.1f}%). Device: {}, mount: {}.".format(
                used_percent, threshold, device, mount
            )
            return {"failed": True, "msg": msg}

        return {}