Bitnami package for Memcached

Memcached is an high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load.

Overview of Memcached

Trademarks: This software listing is packaged by Bitnami. The respective trademarks mentioned in the offering are owned by the respective companies, and use of them does not imply any affiliation or endorsement.

TL;DR

helm install my-release oci://REGISTRY_NAME/REPOSITORY_NAME/memcached

Note: You need to substitute the placeholders REGISTRY_NAME and REPOSITORY_NAME with a reference to your Helm chart registry and repository.

Introduction

This chart bootstraps a Memcached deployment on a Kubernetes cluster using the Helm package manager.

Bitnami charts can be used with Kubeapps for deployment and management of Helm Charts in clusters.

Prerequisites

  • Kubernetes 1.23+
  • Helm 3.8.0+

Installing the Chart

To install the chart with the release name my-release:

helm install my-release oci://REGISTRY_NAME/REPOSITORY_NAME/memcached

Note: You need to substitute the placeholders REGISTRY_NAME and REPOSITORY_NAME with a reference to your Helm chart registry and repository. For example, in the case of Bitnami, you need to use REGISTRY_NAME=registry-1.docker.io and REPOSITORY_NAME=bitnamicharts.

These commands deploy Memcached on the Kubernetes cluster in the default configuration. The Parameters section lists the parameters that can be configured during installation.

Tip: List all releases using helm list

Configuration and installation details

Resource requests and limits

Bitnami charts allow setting resource requests and limits for all containers inside the chart deployment. These are inside the resources value (check parameter table). Setting requests is essential for production workloads and these should be adapted to your specific use case.

To make this process easier, the chart contains the resourcesPreset values, which automatically sets the resources section according to different presets. Check these presets in the bitnami/common chart. However, in production workloads using resourcePreset is discouraged as it may not fully adapt to your specific needs. Find more information on container resource management in the official Kubernetes documentation.

Rolling vs Immutable tags

It is strongly recommended to use immutable tags in a production environment. This ensures your deployment does not change automatically if the same tag is updated with a different image.

Bitnami will release a new chart updating its containers if a new version of the main container, significant changes, or critical vulnerabilities exist.

Use Sidecars and Init Containers

If additional containers are needed in the same pod (such as additional metrics or logging exporters), they can be defined using the sidecars config parameter.

sidecars:
- name: your-image-name
  image: your-image
  imagePullPolicy: Always
  ports:
  - name: portname
    containerPort: 1234

If these sidecars export extra ports, extra port definitions can be added using the service.extraPorts parameter (where available), as shown in the example below:

service:
  extraPorts:
  - name: extraPort
    port: 11311
    targetPort: 11311

NOTE: This Helm chart already includes sidecar containers for the Prometheus exporters (where applicable). These can be activated by adding the --enable-metrics=true parameter at deployment time. The sidecars parameter should therefore only be used for any extra sidecar containers.

If additional init containers are needed in the same pod, they can be defined using the initContainers parameter. Here is an example:

initContainers:
  - name: your-image-name
    image: your-image
    imagePullPolicy: Always
    ports:
      - name: portname
        containerPort: 1234

Learn more about sidecar containers and init containers.

Set Pod affinity

This chart allows you to set your custom affinity using the affinity parameter(s). Find more information about Pod affinity in the Kubernetes documentation.

As an alternative, you can use the preset configurations for pod affinity, pod anti-affinity, and node affinity available at the bitnami/common chart. To do so, set the podAffinityPreset, podAntiAffinityPreset, or nodeAffinityPreset parameters.

Persistence

When using architecture: "high-availability" the Bitnami Memcached image stores the cache-state at the /cache-state path of the container if enabled.

Persistent Volume Claims (PVCs) are used to keep the data across deployments. This is known to work in GCE, AWS, and minikube.

See the Parameters section to configure the PVC or to disable persistence.

If you encounter errors when working with persistent volumes, refer to our troubleshooting guide for persistent volumes.

Parameters

Global parameters

Name Description Value
global.imageRegistry Global Docker image registry ""
global.imagePullSecrets Global Docker registry secret names as an array []
global.storageClass Global StorageClass for Persistent Volume(s) ""
global.compatibility.openshift.adaptSecurityContext Adapt the securityContext sections of the deployment to make them compatible with Openshift restricted-v2 SCC: remove runAsUser, runAsGroup and fsGroup and let the platform use their allowed default IDs. Possible values: auto (apply if the detected running cluster is Openshift), force (perform the adaptation always), disabled (do not perform adaptation) auto

Common parameters

Name Description Value
kubeVersion Override Kubernetes version ""
nameOverride String to partially override common.names.fullname template (will maintain the release name) ""
fullnameOverride String to fully override common.names.fullname template ""
clusterDomain Kubernetes Cluster Domain cluster.local
extraDeploy Extra objects to deploy (evaluated as a template) []
commonLabels Add labels to all the deployed resources {}
commonAnnotations Add annotations to all the deployed resources {}
diagnosticMode.enabled Enable diagnostic mode (all probes will be disabled and the command will be overridden) false
diagnosticMode.command Command to override all containers in the deployment/statefulset ["sleep"]
diagnosticMode.args Args to override all containers in the deployment/statefulset ["infinity"]

Memcached parameters

Name Description Value
image.registry Memcached image registry REGISTRY_NAME
image.repository Memcached image repository REPOSITORY_NAME/memcached
image.digest Memcached image digest in the way sha256:aa…. Please note this parameter, if set, will override the tag ""
image.pullPolicy Memcached image pull policy IfNotPresent
image.pullSecrets Specify docker-registry secret names as an array []
image.debug Specify if debug values should be set false
architecture Memcached architecture. Allowed values: standalone or high-availability standalone
auth.enabled Enable Memcached authentication false
auth.username Memcached admin user ""
auth.password Memcached admin password ""
auth.existingPasswordSecret Existing secret with Memcached credentials (must contain a value for memcached-password key) ""
command Override default container command (useful when using custom images) []
args Override default container args (useful when using custom images) []
extraEnvVars Array with extra environment variables to add to Memcached nodes []
extraEnvVarsCM Name of existing ConfigMap containing extra env vars for Memcached nodes ""
extraEnvVarsSecret Name of existing Secret containing extra env vars for Memcached nodes ""

Deployment/Statefulset parameters

Name Description Value
replicaCount Number of Memcached nodes 1
containerPorts.memcached Memcached container port 11211
livenessProbe.enabled Enable livenessProbe on Memcached containers true
livenessProbe.initialDelaySeconds Initial delay seconds for livenessProbe 30
livenessProbe.periodSeconds Period seconds for livenessProbe 10
livenessProbe.timeoutSeconds Timeout seconds for livenessProbe 5
livenessProbe.failureThreshold Failure threshold for livenessProbe 6
livenessProbe.successThreshold Success threshold for livenessProbe 1
readinessProbe.enabled Enable readinessProbe on Memcached containers true
readinessProbe.initialDelaySeconds Initial delay seconds for readinessProbe 5
readinessProbe.periodSeconds Period seconds for readinessProbe 5
readinessProbe.timeoutSeconds Timeout seconds for readinessProbe 3
readinessProbe.failureThreshold Failure threshold for readinessProbe 6
readinessProbe.successThreshold Success threshold for readinessProbe 1
startupProbe.enabled Enable startupProbe on Memcached containers false
startupProbe.initialDelaySeconds Initial delay seconds for startupProbe 30
startupProbe.periodSeconds Period seconds for startupProbe 10
startupProbe.timeoutSeconds Timeout seconds for startupProbe 1
startupProbe.failureThreshold Failure threshold for startupProbe 15
startupProbe.successThreshold Success threshold for startupProbe 1
customLivenessProbe Custom livenessProbe that overrides the default one {}
customReadinessProbe Custom readinessProbe that overrides the default one {}
customStartupProbe Custom startupProbe that overrides the default one {}
lifecycleHooks for the Memcached container(s) to automate configuration before or after startup {}
resourcesPreset Set container resources according to one common preset (allowed values: none, nano, micro, small, medium, large, xlarge, 2xlarge). This is ignored if resources is set (resources is recommended for production). nano
resources Set container requests and limits for different resources like CPU or memory (essential for production workloads) {}
podSecurityContext.enabled Enabled Memcached pods’ Security Context true
podSecurityContext.fsGroupChangePolicy Set filesystem group change policy Always
podSecurityContext.sysctls Set kernel settings using the sysctl interface []
podSecurityContext.supplementalGroups Set filesystem extra groups []
podSecurityContext.fsGroup Set Memcached pod’s Security Context fsGroup 1001
containerSecurityContext.enabled Enabled containers’ Security Context true
containerSecurityContext.seLinuxOptions Set SELinux options in container {}
containerSecurityContext.runAsUser Set containers’ Security Context runAsUser 1001
containerSecurityContext.runAsGroup Set containers’ Security Context runAsGroup 1001
containerSecurityContext.runAsNonRoot Set container’s Security Context runAsNonRoot true
containerSecurityContext.privileged Set container’s Security Context privileged false
containerSecurityContext.readOnlyRootFilesystem Set container’s Security Context readOnlyRootFilesystem true
containerSecurityContext.allowPrivilegeEscalation Set container’s Security Context allowPrivilegeEscalation false
containerSecurityContext.capabilities.drop List of capabilities to be dropped ["ALL"]
containerSecurityContext.seccompProfile.type Set container’s Security Context seccomp profile RuntimeDefault
automountServiceAccountToken Mount Service Account token in pod false
hostAliases Add deployment host aliases []
podLabels Extra labels for Memcached pods {}
podAnnotations Annotations for Memcached pods {}
podAffinityPreset Pod affinity preset. Ignored if affinity is set. Allowed values: soft or hard ""
podAntiAffinityPreset Pod anti-affinity preset. Ignored if affinity is set. Allowed values: soft or hard soft
nodeAffinityPreset.type Node affinity preset type. Ignored if affinity is set. Allowed values: soft or hard ""
nodeAffinityPreset.key Node label key to match Ignored if affinity is set. ""
nodeAffinityPreset.values Node label values to match. Ignored if affinity is set. []
affinity Affinity for pod assignment {}
nodeSelector Node labels for pod assignment {}
tolerations Tolerations for pod assignment []
topologySpreadConstraints Topology Spread Constraints for pod assignment spread across your cluster among failure-domains. Evaluated as a template []
podManagementPolicy StatefulSet controller supports relax its ordering guarantees while preserving its uniqueness and identity guarantees. There are two valid pod management policies: OrderedReady and Parallel Parallel
priorityClassName Name of the existing priority class to be used by Memcached pods, priority class needs to be created beforehand ""
schedulerName Kubernetes pod scheduler registry ""
terminationGracePeriodSeconds In seconds, time the given to the memcached pod needs to terminate gracefully ""
updateStrategy.type Memcached statefulset strategy type RollingUpdate
updateStrategy.rollingUpdate Memcached statefulset rolling update configuration parameters {}
extraVolumes Optionally specify extra list of additional volumes for the Memcached pod(s) []
extraVolumeMounts Optionally specify extra list of additional volumeMounts for the Memcached container(s) []
sidecars Add additional sidecar containers to the Memcached pod(s) []
initContainers Add additional init containers to the Memcached pod(s) []
enableServiceLinks Whether information about services should be injected into pod’s environment variable true
autoscaling.enabled Enable memcached statefulset autoscaling (requires architecture: “high-availability”) false
autoscaling.minReplicas memcached statefulset autoscaling minimum number of replicas 3
autoscaling.maxReplicas memcached statefulset autoscaling maximum number of replicas 6
autoscaling.targetCPU memcached statefulset autoscaling target CPU percentage 50
autoscaling.targetMemory memcached statefulset autoscaling target CPU memory 50
pdb.create Deploy a pdb object for the Memcached pod true
pdb.minAvailable Minimum available Memcached replicas ""
pdb.maxUnavailable Maximum unavailable Memcached replicas ""

Traffic Exposure parameters

Name Description Value
service.type Kubernetes Service type ClusterIP
service.ports.memcached Memcached service port 11211
service.nodePorts.memcached Node port for Memcached ""
service.sessionAffinity Control where client requests go, to the same pod or round-robin ""
service.sessionAffinityConfig Additional settings for the sessionAffinity {}
service.clusterIP Memcached service Cluster IP ""
service.loadBalancerIP Memcached service Load Balancer IP ""
service.loadBalancerSourceRanges Memcached service Load Balancer sources []
service.externalTrafficPolicy Memcached service external traffic policy Cluster
service.annotations Additional custom annotations for Memcached service {}
service.extraPorts Extra ports to expose in the Memcached service (normally used with the sidecar value) []
networkPolicy.enabled Enable creation of NetworkPolicy resources true
networkPolicy.allowExternal The Policy model to apply true
networkPolicy.allowExternalEgress Allow the pod to access any range of port and all destinations. true
networkPolicy.addExternalClientAccess Allow access from pods with client label set to “true”. Ignored if networkPolicy.allowExternal is true. true
networkPolicy.extraIngress Add extra ingress rules to the NetworkPolicy []
networkPolicy.extraEgress Add extra ingress rules to the NetworkPolicy []
networkPolicy.ingressPodMatchLabels Labels to match to allow traffic from other pods. Ignored if networkPolicy.allowExternal is true. {}
networkPolicy.ingressNSMatchLabels Labels to match to allow traffic from other namespaces. Ignored if networkPolicy.allowExternal is true. {}
networkPolicy.ingressNSPodMatchLabels Pod labels to match to allow traffic from other namespaces. Ignored if networkPolicy.allowExternal is true. {}

Other Parameters

Name Description Value
serviceAccount.create Enable creation of ServiceAccount for Memcached pod true
serviceAccount.name The name of the ServiceAccount to use. ""
serviceAccount.automountServiceAccountToken Allows auto mount of ServiceAccountToken on the serviceAccount created false
serviceAccount.annotations Additional custom annotations for the ServiceAccount {}

Persistence parameters

Name Description Value
persistence.enabled Enable Memcached data persistence using PVC. If false, use emptyDir false
persistence.storageClass PVC Storage Class for Memcached data volume ""
persistence.accessModes PVC Access modes ["ReadWriteOnce"]
persistence.size PVC Storage Request for Memcached data volume 8Gi
persistence.annotations Annotations for the PVC {}
persistence.labels Labels for the PVC {}
persistence.selector Selector to match an existing Persistent Volume for Memcached’s data PVC {}

Volume Permissions parameters

Name Description Value
volumePermissions.enabled Enable init container that changes the owner and group of the persistent volume false
volumePermissions.image.registry Init container volume-permissions image registry REGISTRY_NAME
volumePermissions.image.repository Init container volume-permissions image repository REPOSITORY_NAME/os-shell
volumePermissions.image.digest Init container volume-permissions image digest in the way sha256:aa…. Please note this parameter, if set, will override the tag ""
volumePermissions.image.pullPolicy Init container volume-permissions image pull policy IfNotPresent
volumePermissions.image.pullSecrets Init container volume-permissions image pull secrets []
volumePermissions.resourcesPreset Set container resources according to one common preset (allowed values: none, nano, micro, small, medium, large, xlarge, 2xlarge). This is ignored if volumePermissions.resources is set (volumePermissions.resources is recommended for production). nano
volumePermissions.resources Set container requests and limits for different resources like CPU or memory (essential for production workloads) {}
volumePermissions.containerSecurityContext.seLinuxOptions Set SELinux options in container {}
volumePermissions.containerSecurityContext.runAsUser User ID for the init container 0
metrics.enabled Start a side-car prometheus exporter false
metrics.image.registry Memcached exporter image registry REGISTRY_NAME
metrics.image.repository Memcached exporter image repository REPOSITORY_NAME/memcached-exporter
metrics.image.digest Memcached exporter image digest in the way sha256:aa…. Please note this parameter, if set, will override the tag ""
metrics.image.pullPolicy Image pull policy IfNotPresent
metrics.image.pullSecrets Specify docker-registry secret names as an array []
metrics.containerPorts.metrics Memcached Prometheus Exporter container port 9150
metrics.resourcesPreset Set container resources according to one common preset (allowed values: none, nano, micro, small, medium, large, xlarge, 2xlarge). This is ignored if metrics.resources is set (metrics.resources is recommended for production). nano
metrics.resources Set container requests and limits for different resources like CPU or memory (essential for production workloads) {}
metrics.containerSecurityContext.enabled Enabled containers’ Security Context true
metrics.containerSecurityContext.seLinuxOptions Set SELinux options in container {}
metrics.containerSecurityContext.runAsUser Set containers’ Security Context runAsUser 1001
metrics.containerSecurityContext.runAsGroup Set containers’ Security Context runAsGroup 1001
metrics.containerSecurityContext.runAsNonRoot Set container’s Security Context runAsNonRoot true
metrics.containerSecurityContext.privileged Set container’s Security Context privileged false
metrics.containerSecurityContext.readOnlyRootFilesystem Set container’s Security Context readOnlyRootFilesystem true
metrics.containerSecurityContext.allowPrivilegeEscalation Set container’s Security Context allowPrivilegeEscalation false
metrics.containerSecurityContext.capabilities.drop List of capabilities to be dropped ["ALL"]
metrics.containerSecurityContext.seccompProfile.type Set container’s Security Context seccomp profile RuntimeDefault
metrics.livenessProbe.enabled Enable livenessProbe on Memcached Prometheus exporter containers true
metrics.livenessProbe.initialDelaySeconds Initial delay seconds for livenessProbe 15
metrics.livenessProbe.periodSeconds Period seconds for livenessProbe 10
metrics.livenessProbe.timeoutSeconds Timeout seconds for livenessProbe 5
metrics.livenessProbe.failureThreshold Failure threshold for livenessProbe 3
metrics.livenessProbe.successThreshold Success threshold for livenessProbe 1
metrics.readinessProbe.enabled Enable readinessProbe on Memcached Prometheus exporter containers true
metrics.readinessProbe.initialDelaySeconds Initial delay seconds for readinessProbe 5
metrics.readinessProbe.periodSeconds Period seconds for readinessProbe 10
metrics.readinessProbe.timeoutSeconds Timeout seconds for readinessProbe 3
metrics.readinessProbe.failureThreshold Failure threshold for readinessProbe 3
metrics.readinessProbe.successThreshold Success threshold for readinessProbe 1
metrics.startupProbe.enabled Enable startupProbe on Memcached Prometheus exporter containers false
metrics.startupProbe.initialDelaySeconds Initial delay seconds for startupProbe 10
metrics.startupProbe.periodSeconds Period seconds for startupProbe 10
metrics.startupProbe.timeoutSeconds Timeout seconds for startupProbe 1
metrics.startupProbe.failureThreshold Failure threshold for startupProbe 15
metrics.startupProbe.successThreshold Success threshold for startupProbe 1
metrics.customLivenessProbe Custom livenessProbe that overrides the default one {}
metrics.customReadinessProbe Custom readinessProbe that overrides the default one {}
metrics.customStartupProbe Custom startupProbe that overrides the default one {}
metrics.podAnnotations Memcached Prometheus exporter pod Annotation and Labels {}
metrics.service.ports.metrics Prometheus metrics service port 9150
metrics.service.clusterIP Static clusterIP or None for headless services ""
metrics.service.sessionAffinity Control where client requests go, to the same pod or round-robin None
metrics.service.annotations Annotations for the Prometheus metrics service {}
metrics.serviceMonitor.enabled Create ServiceMonitor Resource for scraping metrics using Prometheus Operator false
metrics.serviceMonitor.namespace Namespace for the ServiceMonitor Resource (defaults to the Release Namespace) ""
metrics.serviceMonitor.interval Interval at which metrics should be scraped. ""
metrics.serviceMonitor.scrapeTimeout Timeout after which the scrape is ended ""
metrics.serviceMonitor.labels Additional labels that can be used so ServiceMonitor will be discovered by Prometheus {}
metrics.serviceMonitor.selector Prometheus instance selector labels {}
metrics.serviceMonitor.relabelings RelabelConfigs to apply to samples before scraping []
metrics.serviceMonitor.metricRelabelings MetricRelabelConfigs to apply to samples before ingestion []
metrics.serviceMonitor.honorLabels Specify honorLabels parameter to add the scrape endpoint false
metrics.serviceMonitor.jobLabel The name of the label on the target service to use as the job name in prometheus. ""

The above parameters map to the environment variables defined in the bitnami/memcached container image. For more information please refer to the bitnami/memcached container image documentation.

Specify each parameter using the --set key=value[,key=value] argument to helm install. For example,

helm install my-release --set auth.username=user,auth.password=password oci://REGISTRY_NAME/REPOSITORY_NAME/memcached

Note: You need to substitute the placeholders REGISTRY_NAME and REPOSITORY_NAME with a reference to your Helm chart registry and repository. For example, in the case of Bitnami, you need to use REGISTRY_NAME=registry-1.docker.io and REPOSITORY_NAME=bitnamicharts.

The above command sets the Memcached admin account username and password to user and password respectively.

NOTE: Once this chart is deployed, it is not possible to change the application’s access credentials, such as usernames or passwords, using Helm. To change these application credentials after deployment, delete any persistent volumes (PVs) used by the chart and re-deploy it, or use the application’s built-in administrative tools if available.

Alternatively, a YAML file that specifies the values for the parameters can be provided while installing the chart. For example,

helm install my-release -f values.yaml oci://REGISTRY_NAME/REPOSITORY_NAME/memcached

Note: You need to substitute the placeholders REGISTRY_NAME and REPOSITORY_NAME with a reference to your Helm chart registry and repository. For example, in the case of Bitnami, you need to use REGISTRY_NAME=registry-1.docker.io and REPOSITORY_NAME=bitnamicharts. Tip: You can use the default values.yaml

Troubleshooting

Find more information about how to deal with common errors related to Bitnami’s Helm charts in this troubleshooting guide.

Upgrading

To 7.0.0

This major bump changes the following security defaults:

  • runAsGroup is changed from 0 to 1001
  • readOnlyRootFilesystem is set to true
  • resourcesPreset is changed from none to the minimum size working in our test suites (NOTE: resourcesPreset is not meant for production usage, but resources adapted to your use case).
  • global.compatibility.openshift.adaptSecurityContext is changed from disabled to auto.

This could potentially break any customization or init scripts used in your deployment. If this is the case, change the default values to the previous ones.

To 6.0.0

This major release renames several values in this chart and adds missing features, in order to be inline with the rest of assets in the Bitnami charts repository.

Some affected values are:

  • memcachedUsername and memcachedPassword have regrouped under the auth map.
  • arguments has been renamed to args.
  • extraEnv has been renamed to extraEnvVars.
  • service.port, service.internalPort and service.externalPort have been regrouped under the service.ports map.
  • metrics.kafka.service.port has been regrouped under the metrics.kafka.service.ports map.
  • metrics.jmx.service.port has been regrouped under the metrics.jmx.service.ports map.
  • updateStrategy (string) and rollingUpdatePartition are regrouped under the updateStrategy map.

To 5.3.0

This version introduces bitnami/common, a library chart as a dependency. More documentation about this new utility could be found here. Please, make sure that you have updated the chart dependencies before executing any upgrade.

To 5.0.0

On November 13, 2020, Helm v2 support formally ended. This major version is the result of the required changes applied to the Helm Chart to be able to incorporate the different features added in Helm v3 and to be consistent with the Helm project itself regarding the Helm v2 EOL.

To 4.0.0

Backwards compatibility is not guaranteed unless you modify the labels used on the chart’s deployments. Use the workaround below to upgrade from versions previous to 4.0.0. The following example assumes that the release name is memcached:

kubectl delete deployment  memcached --cascade=false
helm upgrade memcached oci://REGISTRY_NAME/REPOSITORY_NAME/memcached

Note: You need to substitute the placeholders REGISTRY_NAME and REPOSITORY_NAME with a reference to your Helm chart registry and repository. For example, in the case of Bitnami, you need to use REGISTRY_NAME=registry-1.docker.io and REPOSITORY_NAME=bitnamicharts.

To 3.0.0

This release uses the new bash based bitnami/memcached container which uses bash scripts for the start up logic of the container and is smaller in size.

To 1.0.0

Backwards compatibility is not guaranteed unless you modify the labels used on the chart’s deployments. Use the workaround below to upgrade from versions previous to 1.0.0. The following example assumes that the release name is memcached:

kubectl patch deployment memcached --type=json -p='[{"op": "remove", "path": "/spec/selector/matchLabels/chart"}]'

License

Copyright © 2024 Broadcom. The term “Broadcom” refers to Broadcom Inc. and/or its subsidiaries.

Licensed under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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