add etcd volume check

1 files changed, 58 insertions, 0 deletions

diff --git a/roles/openshift_health_checker/openshift_checks/etcd_volume.py b/roles/openshift_health_checker/openshift_checks/etcd_volume.py
new file mode 100644
index 000000000..cbdf70092
--- /dev/null
+++ b/roles/openshift_health_checker/openshift_checks/etcd_volume.py
@@ -0,0 +1,58 @@
+# vim: expandtab:tabstop=4:shiftwidth=4
+"""
+Ansible module for warning about etcd volume size past a defined threshold.
+"""
+
+from openshift_checks import OpenShiftCheck, OpenShiftCheckException, get_var
+
+
+class EtcdVolume(OpenShiftCheck):
+    """Ensure disk size for an etcd host does not exceed a defined limit"""
+
+    name = "etcd_volume"
+    tags = ["etcd", "health"]
+
+    etcd_default_size_limit_percent = 0.9
+
+    def run(self, tmp, task_vars):
+        ansible_mounts = get_var(task_vars, "ansible_mounts")
+
+        etcd_mount_path = self._get_etcd_mount_path(ansible_mounts)
+        etcd_disk_size_available = int(etcd_mount_path["size_available"])
+        etcd_disk_size_total = int(etcd_mount_path["size_total"])
+        etcd_disk_size_used = etcd_disk_size_total - etcd_disk_size_available
+
+        size_limit_percent = get_var(
+            task_vars,
+            "etcd_disk_size_limit_percent",
+            default=self.etcd_default_size_limit_percent
+        )
+
+        if float(etcd_disk_size_used) / float(etcd_disk_size_total) > size_limit_percent:
+            msg = ("Current etcd volume usage ({actual:.2f} GB) for the volume \"{volume}\" "
+                   "is greater than the storage limit ({limit:.2f} GB).")
+            msg = msg.format(
+                actual=self._to_gigabytes(etcd_disk_size_used),
+                volume=etcd_mount_path["mount"],
+                limit=self._to_gigabytes(size_limit_percent * etcd_disk_size_total),
+            )
+            return {"failed": True, "msg": msg}
+
+        return {"changed": False}
+
+    @staticmethod
+    def _get_etcd_mount_path(ansible_mounts):
+        supported_mnt_paths = ["/var/lib/etcd", "/var/lib", "/var", "/"]
+        available_mnts = {mnt.get("mount"): mnt for mnt in ansible_mounts}
+
+        for path in supported_mnt_paths:
+            if path in available_mnts:
+                return available_mnts[path]
+
+        paths = ', '.join(sorted(available_mnts)) or 'none'
+        msg = "Unable to determine available disk space. Paths mounted: {}.".format(paths)
+        raise OpenShiftCheckException(msg)
+
+    @staticmethod
+    def _to_gigabytes(byte_size):
+        return float(byte_size) / 10.0**9