disk/memory checks: make threshold configurable

roles/openshift_health_checker/openshift_checks/disk_availability.py

@@ -27,10 +27,12 @@ def is_active(cls, task_vars):
     def run(self, tmp, task_vars):
         group_names = get_var(task_vars, "group_names")
         ansible_mounts = get_var(task_vars, "ansible_mounts")
-
-        min_free_bytes = max(self.recommended_disk_space_bytes.get(name, 0) for name in group_names)
         free_bytes = self.openshift_available_disk(ansible_mounts)
 
+        recommended_min = max(self.recommended_disk_space_bytes.get(name, 0) for name in group_names)
+        configured_min = int(get_var(task_vars, "openshift_check_min_host_disk_gb", default=0)) * 10**9
+        min_free_bytes = configured_min or recommended_min
+
         if free_bytes < min_free_bytes:
             return {
                 'failed': True,

roles/openshift_health_checker/openshift_checks/memory_availability.py

@@ -27,7 +27,9 @@ def run(self, tmp, task_vars):
         group_names = get_var(task_vars, "group_names")
         total_memory_bytes = get_var(task_vars, "ansible_memtotal_mb") * 10**6
 
-        min_memory_bytes = max(self.recommended_memory_bytes.get(name, 0) for name in group_names)
+        recommended_min = max(self.recommended_memory_bytes.get(name, 0) for name in group_names)
+        configured_min = int(get_var(task_vars, "openshift_check_min_host_memory_gb", default=0)) * 10**9
+        min_memory_bytes = configured_min or recommended_min
 
         if total_memory_bytes < min_memory_bytes:
             return {

roles/openshift_health_checker/test/disk_availability_test.py

@@ -42,30 +42,42 @@ def test_cannot_determine_available_disk(ansible_mounts, extra_words):
         assert word in str(excinfo.value)
 
 
-@pytest.mark.parametrize('group_names,ansible_mounts', [
+@pytest.mark.parametrize('group_names,configured_min,ansible_mounts', [
     (
         ['masters'],
+        0,
         [{
             'mount': '/',
             'size_available': 40 * 10**9 + 1,
         }],
     ),
     (
         ['nodes'],
+        0,
         [{
             'mount': '/',
             'size_available': 15 * 10**9 + 1,
         }],
     ),
     (
         ['etcd'],
+        0,
         [{
             'mount': '/',
             'size_available': 20 * 10**9 + 1,
         }],
     ),
     (
         ['etcd'],
+        1,  # configure lower threshold
+        [{
+            'mount': '/',
+            'size_available': 1 * 10**9 + 1,  # way smaller than recommended
+        }],
+    ),
+    (
+        ['etcd'],
+        0,
         [{
             # not enough space on / ...
             'mount': '/',
@@ -77,9 +89,10 @@ def test_cannot_determine_available_disk(ansible_mounts, extra_words):
         }],
     ),
 ])
-def test_succeeds_with_recommended_disk_space(group_names, ansible_mounts):
+def test_succeeds_with_recommended_disk_space(group_names, configured_min, ansible_mounts):
     task_vars = dict(
         group_names=group_names,
+        openshift_check_min_host_disk_gb=configured_min,
         ansible_mounts=ansible_mounts,
     )
 
@@ -89,17 +102,28 @@ def test_succeeds_with_recommended_disk_space(group_names, ansible_mounts):
     assert not result.get('failed', False)
 
 
-@pytest.mark.parametrize('group_names,ansible_mounts,extra_words', [
+@pytest.mark.parametrize('group_names,configured_min,ansible_mounts,extra_words', [
     (
         ['masters'],
+        0,
         [{
             'mount': '/',
             'size_available': 1,
         }],
         ['0.0 GB'],
     ),
+    (
+        ['masters'],
+        100,  # set a higher threshold
+        [{
+            'mount': '/',
+            'size_available': 50 * 10**9,  # would normally be enough...
+        }],
+        ['100.0 GB'],
+    ),
     (
         ['nodes'],
+        0,
         [{
             'mount': '/',
             'size_available': 1 * 10**9,
@@ -108,6 +132,7 @@ def test_succeeds_with_recommended_disk_space(group_names, ansible_mounts):
     ),
     (
         ['etcd'],
+        0,
         [{
             'mount': '/',
             'size_available': 1,
@@ -116,6 +141,7 @@ def test_succeeds_with_recommended_disk_space(group_names, ansible_mounts):
     ),
     (
         ['nodes', 'masters'],
+        0,
         [{
             'mount': '/',
             # enough space for a node, not enough for a master
@@ -125,6 +151,7 @@ def test_succeeds_with_recommended_disk_space(group_names, ansible_mounts):
     ),
     (
         ['etcd'],
+        0,
         [{
             # enough space on / ...
             'mount': '/',
@@ -137,9 +164,10 @@ def test_succeeds_with_recommended_disk_space(group_names, ansible_mounts):
         ['0.0 GB'],
     ),
 ])
-def test_fails_with_insufficient_disk_space(group_names, ansible_mounts, extra_words):
+def test_fails_with_insufficient_disk_space(group_names, configured_min, ansible_mounts, extra_words):
     task_vars = dict(
         group_names=group_names,
+        openshift_check_min_host_disk_gb=configured_min,
         ansible_mounts=ansible_mounts,
     )
 

roles/openshift_health_checker/test/memory_availability_test.py

@@ -20,27 +20,37 @@ def test_is_active(group_names, is_active):
     assert MemoryAvailability.is_active(task_vars=task_vars) == is_active
 
 
-@pytest.mark.parametrize('group_names,ansible_memtotal_mb', [
+@pytest.mark.parametrize('group_names,configured_min,ansible_memtotal_mb', [
     (
         ['masters'],
+        0,
         17200,
     ),
     (
         ['nodes'],
+        0,
         8200,
     ),
+    (
+        ['nodes'],
+        1,  # configure lower threshold
+        2000,  # too low for recommended but not for configured
+    ),
     (
         ['etcd'],
+        0,
         22200,
     ),
     (
         ['masters', 'nodes'],
+        0,
         17000,
     ),
 ])
-def test_succeeds_with_recommended_memory(group_names, ansible_memtotal_mb):
+def test_succeeds_with_recommended_memory(group_names, configured_min, ansible_memtotal_mb):
     task_vars = dict(
         group_names=group_names,
+        openshift_check_min_host_memory_gb=configured_min,
         ansible_memtotal_mb=ansible_memtotal_mb,
     )
 
@@ -50,39 +60,50 @@ def test_succeeds_with_recommended_memory(group_names, ansible_memtotal_mb):
     assert not result.get('failed', False)
 
 
-@pytest.mark.parametrize('group_names,ansible_memtotal_mb,extra_words', [
+@pytest.mark.parametrize('group_names,configured_min,ansible_memtotal_mb,extra_words', [
     (
         ['masters'],
         0,
+        0,
         ['0.0 GB'],
     ),
     (
         ['nodes'],
+        0,
         100,
         ['0.1 GB'],
     ),
+    (
+        ['nodes'],
+        24,  # configure higher threshold
+        20000,  # enough to meet recommended but not configured
+        ['20.0 GB'],
+    ),
     (
         ['etcd'],
+        0,
         -1,
         ['0.0 GB'],
     ),
     (
         ['nodes', 'masters'],
+        0,
         # enough memory for a node, not enough for a master
         11000,
         ['11.0 GB'],
     ),
 ])
-def test_fails_with_insufficient_memory(group_names, ansible_memtotal_mb, extra_words):
+def test_fails_with_insufficient_memory(group_names, configured_min, ansible_memtotal_mb, extra_words):
     task_vars = dict(
         group_names=group_names,
+        openshift_check_min_host_memory_gb=configured_min,
         ansible_memtotal_mb=ansible_memtotal_mb,
     )
 
     check = MemoryAvailability(execute_module=fake_execute_module)
     result = check.run(tmp=None, task_vars=task_vars)
 
-    assert result['failed']
+    assert result.get('failed', False)
     for word in 'below recommended'.split() + extra_words:
         assert word in result['msg']