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"""A health check for OpenShift clusters."""
from openshift_checks import OpenShiftCheck, OpenShiftCheckException, get_var
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 ectd data, higher priority first.
supported_mount_paths = ["/var/lib/etcd", "/var/lib", "/var", "/"]
@classmethod
def is_active(cls, task_vars):
etcd_hosts = get_var(task_vars, "groups", "etcd", default=[]) or get_var(task_vars, "groups", "masters",
default=[]) or []
is_etcd_host = get_var(task_vars, "ansible_ssh_host") in etcd_hosts
return super(EtcdVolume, cls).is_active(task_vars) and is_etcd_host
def run(self, tmp, task_vars):
mount_info = self._etcd_mount_info(task_vars)
available = mount_info["size_available"]
total = mount_info["size_total"]
used = total - available
threshold = get_var(
task_vars,
"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 {"changed": False}
def _etcd_mount_info(self, task_vars):
ansible_mounts = get_var(task_vars, "ansible_mounts")
mounts = {mnt.get("mount"): mnt for mnt in ansible_mounts}
for path in self.supported_mount_paths:
if path in mounts:
return mounts[path]
paths = ', '.join(sorted(mounts)) or 'none'
msg = "Unable to find etcd storage mount point. Paths mounted: {}.".format(paths)
raise OpenShiftCheckException(msg)
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