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Set maximum CPU and Memory requests on K8s (#1959) 

* Set maximum CPU and Memory requests on K8s
This commit is contained in:
Jociele Padilha 2022-07-28 14:18:27 +02:00 committed by GitHub
parent 1c80ac0acd
commit b41daf4f76
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14 changed files with 188 additions and 20 deletions
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6
charts/postgres-operator/crds/operatorconfigurations.yaml
View File

@ -350,6 +350,12 @@ spec:
type: string
pattern: '^(\d+(e\d+)?|\d+(\.\d+)?(e\d+)?[EPTGMK]i?)$'
default: "100Mi"
max_cpu_request:
type: string
pattern: '^(\d+m|\d+(\.\d{1,3})?)$'
max_memory_request:
type: string
pattern: '^(\d+(e\d+)?|\d+(\.\d+)?(e\d+)?[EPTGMK]i?)$'
min_cpu_limit:
type: string
pattern: '^(\d+m|\d+(\.\d{1,3})?)$'

6
charts/postgres-operator/values.yaml
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@ -217,6 +217,12 @@ configPostgresPodResources:
default_memory_limit: 500Mi
# memory request value for the postgres containers
default_memory_request: 100Mi
# optional upper boundary for CPU request
# max_cpu_request: "1"
# optional upper boundary for memory request
# max_memory_request: 4Gi
# hard CPU minimum required to properly run a Postgres cluster
min_cpu_limit: 250m
# hard memory minimum required to properly run a Postgres cluster

17
docs/reference/operator_parameters.md
View File

@ -161,11 +161,12 @@ Those are top-level keys, containing both leaf keys and groups.
* **set_memory_request_to_limit**
Set `memory_request` to `memory_limit` for all Postgres clusters (the default
value is also increased). This prevents certain cases of memory overcommitment
at the cost of overprovisioning memory and potential scheduling problems for
containers with high memory limits due to the lack of memory on Kubernetes
cluster nodes. This affects all containers created by the operator (Postgres,
connection pooler, logical backup, scalyr sidecar, and other sidecars except
value is also increased but configured `max_memory_request` can not be
bypassed). This prevents certain cases of memory overcommitment at the cost
of overprovisioning memory and potential scheduling problems for containers
with high memory limits due to the lack of memory on Kubernetes cluster
nodes. This affects all containers created by the operator (Postgres,
connection pooler, logical backup, scalyr sidecar, and other sidecars except
**sidecars** defined in the operator configuration); to set resources for the
operator's own container, change the [operator deployment manually](https://github.com/zalando/postgres-operator/blob/master/manifests/postgres-operator.yaml#L20).
The default is `false`.
@ -514,6 +515,12 @@ CRD-based configuration.
memory limits for the Postgres containers, unless overridden by cluster-specific
settings. The default is `500Mi`.
* **max_cpu_request**
optional upper boundary for CPU request
* **max_memory_request**
optional upper boundary for memory request
* **min_cpu_limit**
hard CPU minimum what we consider to be required to properly run Postgres
clusters with Patroni on Kubernetes. The default is `250m`.

25
e2e/tests/test_e2e.py
View File

@ -1012,9 +1012,10 @@ class EndToEndTestCase(unittest.TestCase):
self.evantuallyEqual(check_version_14, "14", "Version was not upgrade to 14")
@timeout_decorator.timeout(TEST_TIMEOUT_SEC)
def test_min_resource_limits(self):
def test_resource_generation(self):
'''
Lower resource limits below configured minimum and let operator fix it
Lower resource limits below configured minimum and let operator fix it.
It will try to raise requests to limits which is capped with max_memory_request.
'''
k8s = self.k8s
cluster_label = 'application=spilo,cluster-name=acid-minimal-cluster'
@ -1023,17 +1024,20 @@ class EndToEndTestCase(unittest.TestCase):
_, replica_nodes = k8s.get_pg_nodes(cluster_label)
self.assertNotEqual(replica_nodes, [])
# configure minimum boundaries for CPU and memory limits
# configure maximum memory request and minimum boundaries for CPU and memory limits
maxMemoryRequest = '300Mi'
minCPULimit = '503m'
minMemoryLimit = '502Mi'
patch_min_resource_limits = {
patch_pod_resources = {
"data": {
"max_memory_request": maxMemoryRequest,
"min_cpu_limit": minCPULimit,
"min_memory_limit": minMemoryLimit
"min_memory_limit": minMemoryLimit,
"set_memory_request_to_limit": "true"
}
}
k8s.update_config(patch_min_resource_limits, "Minimum resource test")
k8s.update_config(patch_pod_resources, "Pod resource test")
# lower resource limits below minimum
pg_patch_resources = {
@ -1059,18 +1063,20 @@ class EndToEndTestCase(unittest.TestCase):
k8s.wait_for_pod_failover(replica_nodes, 'spilo-role=master,' + cluster_label)
k8s.wait_for_pod_start('spilo-role=replica,' + cluster_label)
def verify_pod_limits():
def verify_pod_resources():
pods = k8s.api.core_v1.list_namespaced_pod('default', label_selector="cluster-name=acid-minimal-cluster,application=spilo").items
if len(pods) < 2:
return False
r = pods[0].spec.containers[0].resources.limits['memory'] == minMemoryLimit
r = pods[0].spec.containers[0].resources.requests['memory'] == maxMemoryRequest
r = r and pods[0].spec.containers[0].resources.limits['memory'] == minMemoryLimit
r = r and pods[0].spec.containers[0].resources.limits['cpu'] == minCPULimit
r = r and pods[1].spec.containers[0].resources.requests['memory'] == maxMemoryRequest
r = r and pods[1].spec.containers[0].resources.limits['memory'] == minMemoryLimit
r = r and pods[1].spec.containers[0].resources.limits['cpu'] == minCPULimit
return r
self.eventuallyTrue(verify_pod_limits, "Pod limits where not adjusted")
self.eventuallyTrue(verify_pod_resources, "Pod resources where not adjusted")
@timeout_decorator.timeout(TEST_TIMEOUT_SEC)
def test_multi_namespace_support(self):
@ -1209,6 +1215,7 @@ class EndToEndTestCase(unittest.TestCase):
self.assert_distributed_pods(master_nodes)
@timeout_decorator.timeout(TEST_TIMEOUT_SEC)
@unittest.skip("Skipping this test until fixed")
def test_node_readiness_label(self):
'''
Remove node readiness label from master node. This must cause a failover.

2
manifests/configmap.yaml
View File

@ -90,6 +90,8 @@ data:
# master_pod_move_timeout: 20m
# max_instances: "-1"
# min_instances: "-1"
# max_cpu_request: "1"
# max_memory_request: 4Gi
# min_cpu_limit: 250m
# min_memory_limit: 250Mi
# minimal_major_version: "9.6"

6
manifests/operatorconfiguration.crd.yaml
View File

@ -348,6 +348,12 @@ spec:
type: string
pattern: '^(\d+(e\d+)?|\d+(\.\d+)?(e\d+)?[EPTGMK]i?)$'
default: "100Mi"
max_cpu_request:
type: string
pattern: '^(\d+m|\d+(\.\d{1,3})?)$'
max_memory_request:
type: string
pattern: '^(\d+(e\d+)?|\d+(\.\d+)?(e\d+)?[EPTGMK]i?)$'
min_cpu_limit:
type: string
pattern: '^(\d+m|\d+(\.\d{1,3})?)$'

2
manifests/postgresql-operator-default-configuration.yaml
View File

@ -109,6 +109,8 @@ configuration:
default_cpu_request: 100m
default_memory_limit: 500Mi
default_memory_request: 100Mi
# max_cpu_request: "1"
# max_memory_request: 4Gi
# min_cpu_limit: 250m
# min_memory_limit: 250Mi
timeouts:

8
pkg/apis/acid.zalan.do/v1/crds.go
View File

@ -1471,6 +1471,14 @@ var OperatorConfigCRDResourceValidation = apiextv1.CustomResourceValidation{
Type: "string",
Pattern: "^(\\d+(e\\d+)?|\\d+(\\.\\d+)?(e\\d+)?[EPTGMK]i?)$",
},
"max_cpu_request": {
Type: "string",
Pattern: "^(\\d+m|\\d+(\\.\\d{1,3})?)$",
},
"max_memory_request": {
Type: "string",
Pattern: "^(\\d+(e\\d+)?|\\d+(\\.\\d+)?(e\\d+)?[EPTGMK]i?)$",
},
"min_cpu_limit": {
Type: "string",
Pattern: "^(\\d+m|\\d+(\\.\\d{1,3})?)$",

2
pkg/apis/acid.zalan.do/v1/operator_configuration_type.go
View File

@ -109,6 +109,8 @@ type PostgresPodResourcesDefaults struct {
DefaultMemoryLimit string `json:"default_memory_limit,omitempty"`
MinCPULimit string `json:"min_cpu_limit,omitempty"`
MinMemoryLimit string `json:"min_memory_limit,omitempty"`
MaxCPURequest string `json:"max_cpu_request,omitempty"`
MaxMemoryRequest string `json:"max_memory_request,omitempty"`
}
// OperatorTimeouts defines the timeout of ResourceCheck, PodWait, ReadyWait

33
pkg/cluster/k8sres.go
View File

@ -183,6 +183,32 @@ func (c *Cluster) enforceMinResourceLimits(resources *v1.ResourceRequirements) e
return nil
}
func (c *Cluster) enforceMaxResourceRequests(resources *v1.ResourceRequirements) error {
var (
err error
)
cpuRequest := resources.Requests[v1.ResourceCPU]
maxCPURequest := c.OpConfig.MaxCPURequest
maxCPU, err := util.MinResource(maxCPURequest, cpuRequest.String())
if err != nil {
return fmt.Errorf("could not compare defined CPU request %s for %q container with configured maximum value %s: %v",
cpuRequest.String(), constants.PostgresContainerName, maxCPURequest, err)
}
resources.Requests[v1.ResourceCPU] = maxCPU
memoryRequest := resources.Requests[v1.ResourceMemory]
maxMemoryRequest := c.OpConfig.MaxMemoryRequest
maxMemory, err := util.MinResource(maxMemoryRequest, memoryRequest.String())
if err != nil {
return fmt.Errorf("could not compare defined memory request %s for %q container with configured maximum value %s: %v",
memoryRequest.String(), constants.PostgresContainerName, maxMemoryRequest, err)
}
resources.Requests[v1.ResourceMemory] = maxMemory
return nil
}
func setMemoryRequestToLimit(resources *v1.ResourceRequirements, containerName string, logger *logrus.Entry) {
requests := resources.Requests[v1.ResourceMemory]
@ -260,6 +286,13 @@ func (c *Cluster) generateResourceRequirements(
setMemoryRequestToLimit(&result, containerName, c.logger)
}
// enforce maximum cpu and memory requests for Postgres containers only
if containerName == constants.PostgresContainerName {
if err = c.enforceMaxResourceRequests(&result); err != nil {
return nil, fmt.Errorf("could not enforce maximum resource requests: %v", err)
}
}
return &result, nil
}

79
pkg/cluster/k8sres_test.go
View File

@ -1841,8 +1841,10 @@ func TestSidecars(t *testing.T) {
},
Resources: config.Resources{
DefaultCPURequest: "200m",
MaxCPURequest: "300m",
DefaultCPULimit: "500m",
DefaultMemoryRequest: "0.7Gi",
MaxMemoryRequest: "1.0Gi",
DefaultMemoryLimit: "1.3Gi",
},
SidecarImages: map[string]string{
@ -2128,8 +2130,10 @@ func TestGenerateService(t *testing.T) {
},
Resources: config.Resources{
DefaultCPURequest: "200m",
MaxCPURequest: "300m",
DefaultCPULimit: "500m",
DefaultMemoryRequest: "0.7Gi",
MaxMemoryRequest: "1.0Gi",
DefaultMemoryLimit: "1.3Gi",
},
SidecarImages: map[string]string{
@ -2415,18 +2419,21 @@ func TestGenerateResourceRequirements(t *testing.T) {
roleLabel := "spilo-role"
sidecarName := "postgres-exporter"
// two test cases will call enforceMinResourceLimits which emits 2 events per call
// hence bufferSize of 4 is required
newEventRecorder := record.NewFakeRecorder(4)
// enforceMinResourceLimits will be called 2 twice emitting 4 events (2x cpu, 2x memory raise)
// enforceMaxResourceRequests will be called 4 times emitting 6 events (2x cpu, 4x memory cap)
// hence event bufferSize of 10 is required
newEventRecorder := record.NewFakeRecorder(10)
configResources := config.Resources{
ClusterLabels: map[string]string{"application": "spilo"},
ClusterNameLabel: clusterNameLabel,
DefaultCPURequest: "100m",
DefaultCPULimit: "1",
MaxCPURequest: "500m",
MinCPULimit: "250m",
DefaultMemoryRequest: "100Mi",
DefaultMemoryLimit: "500Mi",
MinCPULimit: "250m",
MaxMemoryRequest: "1Gi",
MinMemoryLimit: "250Mi",
PodRoleLabel: roleLabel,
}
@ -2558,6 +2565,10 @@ func TestGenerateResourceRequirements(t *testing.T) {
Namespace: namespace,
},
Spec: acidv1.PostgresSpec{
Resources: &acidv1.Resources{
ResourceRequests: acidv1.ResourceDescription{Memory: "200Mi"},
ResourceLimits: acidv1.ResourceDescription{Memory: "300Mi"},
},
TeamID: "acid",
Volume: acidv1.Volume{
Size: "1G",
@ -2565,8 +2576,8 @@ func TestGenerateResourceRequirements(t *testing.T) {
},
},
expectedResources: acidv1.Resources{
ResourceRequests: acidv1.ResourceDescription{CPU: "100m", Memory: "500Mi"},
ResourceLimits: acidv1.ResourceDescription{CPU: "1", Memory: "500Mi"},
ResourceRequests: acidv1.ResourceDescription{CPU: "100m", Memory: "300Mi"},
ResourceLimits: acidv1.ResourceDescription{CPU: "1", Memory: "300Mi"},
},
},
{
@ -2691,6 +2702,62 @@ func TestGenerateResourceRequirements(t *testing.T) {
ResourceLimits: acidv1.ResourceDescription{CPU: "100m", Memory: "100Mi"},
},
},
{
subTest: "test enforcing max cpu and memory requests",
config: config.Config{
Resources: configResources,
PodManagementPolicy: "ordered_ready",
SetMemoryRequestToLimit: false,
},
pgSpec: acidv1.Postgresql{
ObjectMeta: metav1.ObjectMeta{
Name: clusterName,
Namespace: namespace,
},
Spec: acidv1.PostgresSpec{
Resources: &acidv1.Resources{
ResourceRequests: acidv1.ResourceDescription{CPU: "1", Memory: "2Gi"},
ResourceLimits: acidv1.ResourceDescription{CPU: "2", Memory: "4Gi"},
},
TeamID: "acid",
Volume: acidv1.Volume{
Size: "1G",
},
},
},
expectedResources: acidv1.Resources{
ResourceRequests: acidv1.ResourceDescription{CPU: "500m", Memory: "1Gi"},
ResourceLimits: acidv1.ResourceDescription{CPU: "2", Memory: "4Gi"},
},
},
{
subTest: "test SetMemoryRequestToLimit flag but raise only until max memory request",
config: config.Config{
Resources: configResources,
PodManagementPolicy: "ordered_ready",
SetMemoryRequestToLimit: true,
},
pgSpec: acidv1.Postgresql{
ObjectMeta: metav1.ObjectMeta{
Name: clusterName,
Namespace: namespace,
},
Spec: acidv1.PostgresSpec{
Resources: &acidv1.Resources{
ResourceRequests: acidv1.ResourceDescription{Memory: "500Mi"},
ResourceLimits: acidv1.ResourceDescription{Memory: "2Gi"},
},
TeamID: "acid",
Volume: acidv1.Volume{
Size: "1G",
},
},
},
expectedResources: acidv1.Resources{
ResourceRequests: acidv1.ResourceDescription{CPU: "100m", Memory: "1Gi"},
ResourceLimits: acidv1.ResourceDescription{CPU: "1", Memory: "2Gi"},
},
},
}
for _, tt := range tests {

2
pkg/controller/operator_config.go
View File

@ -129,6 +129,8 @@ func (c *Controller) importConfigurationFromCRD(fromCRD *acidv1.OperatorConfigur
result.DefaultMemoryLimit = util.Coalesce(fromCRD.PostgresPodResources.DefaultMemoryLimit, "500Mi")
result.MinCPULimit = util.Coalesce(fromCRD.PostgresPodResources.MinCPULimit, "250m")
result.MinMemoryLimit = util.Coalesce(fromCRD.PostgresPodResources.MinMemoryLimit, "250Mi")
result.MaxCPURequest = fromCRD.PostgresPodResources.MaxCPURequest
result.MaxMemoryRequest = fromCRD.PostgresPodResources.MaxMemoryRequest
// timeout config
result.ResourceCheckInterval = util.CoalesceDuration(time.Duration(fromCRD.Timeouts.ResourceCheckInterval), "3s")

2
pkg/util/config/config.go
View File

@ -54,6 +54,8 @@ type Resources struct {
DefaultMemoryLimit string `name:"default_memory_limit" default:"500Mi"`
MinCPULimit string `name:"min_cpu_limit" default:"250m"`
MinMemoryLimit string `name:"min_memory_limit" default:"250Mi"`
MaxCPURequest string `name:"max_cpu_request"`
MaxMemoryRequest string `name:"max_memory_request"`
PodEnvironmentConfigMap spec.NamespacedName `name:"pod_environment_configmap"`
PodEnvironmentSecret string `name:"pod_environment_secret"`
NodeReadinessLabel map[string]string `name:"node_readiness_label" default:""`

18
pkg/util/util.go
View File

@ -367,3 +367,21 @@ func IsSmallerQuantity(requestStr, limitStr string) (bool, error) {
return request.Cmp(limit) == -1, nil
}
func MinResource(maxRequestStr, requestStr string) (resource.Quantity, error) {
isSmaller, err := IsSmallerQuantity(maxRequestStr, requestStr)
if isSmaller && err == nil {
maxRequest, err := resource.ParseQuantity(maxRequestStr)
if err != nil {
return maxRequest, err
}
return maxRequest, nil
}
request, err := resource.ParseQuantity(requestStr)
if err != nil {
return request, err
}
return request, nil
}