Bitnami package for EJBCA

EJBCA is an enterprise class PKI Certificate Authority software, built using Java (JEE) technology.

Overview of EJBCA

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/ejbca

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 EJBCA deployment on a Kubernetes cluster using the Helm package manager.

It also packages Bitnami MariaDB as the required databases for the EJBCA application.

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

Prerequisites

  • Kubernetes 1.23+
  • Helm 3.8.0+
  • PV provisioner support in the underlying infrastructure

Installing the Chart

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

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

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 command deploys EJBCA 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.

Set up replication

By default, this chart only deploys a single pod running EJBCA. To increase the number of replicas, follow the steps below:

  1. Create a conventional release with only one replica. This will be scaled later.
  2. Wait for the release to complete and for EJBCA to be running. Verify access to the main page of the application.
  3. Perform an upgrade specifying the number of replicas and the credentials that were previously used. Set the parameters replicaCount, ejbcaAdminPassword and mariadb.auth.password accordingly.

For example, for a release using secretPassword and dbPassword to scale up to a total of 2 replicas, the aforementioned parameters should hold these values replicaCount=2, ejbcaAdminPassword=secretPassword, mariadb.auth.password=dbPassword.

Tip: You can modify the file values.yaml

Configure Sidecars and Init Containers

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

Use an external database

Sometimes, you may want to have EJBCA connect to an external database rather than a database within your cluster - for example, when using a managed database service, or when running a single database server for all your applications. To do this, set the mariadb.enabled parameter to false and specify the credentials for the external database using the externalDatabase.* parameters. Here is an example:

mysql.enabled=false
externalDatabase.host=myexternalhost
externalDatabase.user=myuser
externalDatabase.password=mypassword
externalDatabase.database=mydatabase
externalDatabase.port=3306

Set Pod affinity

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

As an alternative, you can use of 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.

Use a different EJBCA version

To modify the application version used in this chart, specify a different version of the image using the image.tag parameter and/or a different repository using the image.repository parameter.

Persistence

The Bitnami EJBCA image stores the EJBCA data and configurations at the /bitnami path of the container.

Persistent Volume Claims 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.

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 Force target Kubernetes version (using Helm capabilities if not set) ""
nameOverride String to partially override ebjca.fullname template (will maintain the release name) ""
fullnameOverride String to fully override ebjca.fullname template ""
namespaceOverride String to fully override common.names.namespace ""
commonLabels Add labels to all the deployed resources {}
commonAnnotations Annotations to be added to all deployed resources {}
extraDeploy Array of extra objects to deploy with the release []
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 ["sleep"]
diagnosticMode.args Args to override all containers in the deployment ["infinity"]

EJBCA parameters

Name Description Value
image.registry EJBCA image registry REGISTRY_NAME
image.repository EJBCA image name REPOSITORY_NAME/ejbca
image.digest EJBCA image image digest in the way sha256:aa…. Please note this parameter, if set, will override the tag ""
image.pullPolicy EJBCA image pull policy IfNotPresent
image.pullSecrets Specify docker-registry secret names as an array []
image.debug Enable image debug mode false
replicaCount Number of EJBCA replicas to deploy 1
extraVolumeMounts Additional volume mounts (used along with extraVolumes) []
extraVolumes Array of extra volumes to be added deployment. Requires setting extraVolumeMounts []
podAnnotations Additional pod annotations {}
podLabels Additional pod labels {}
podSecurityContext.enabled Enable security context for EJBCA container 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 Group ID for the volumes of the pod 1001
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 []
updateStrategy.type EJBCA deployment strategy type. RollingUpdate
persistence.enabled Whether to enable persistence based on Persistent Volume Claims true
persistence.accessModes Persistent Volume access modes []
persistence.size Size of the PVC to request 2Gi
persistence.storageClass PVC Storage Class ""
persistence.existingClaim Name of an existing PVC to reuse ""
persistence.annotations Persistent Volume Claim annotations {}
sidecars Attach additional sidecar containers to the pod []
initContainers Additional init containers to add to the pods []
pdb.create Enable/disable a Pod Disruption Budget creation true
pdb.minAvailable Minimum number/percentage of pods that should remain scheduled ""
pdb.maxUnavailable Maximum number/percentage of pods that may be made unavailable ""
automountServiceAccountToken Mount Service Account token in pod false
hostAliases Add deployment host aliases []
priorityClassName EJBCA pods’ priorityClassName ""
schedulerName Name of the k8s scheduler (other than default) ""
topologySpreadConstraints Topology Spread Constraints for pod assignment []
ejbcaAdminUsername EJBCA administrator username bitnami
ejbcaAdminPassword Password for the administrator account ""
existingSecret Alternatively, you can provide the name of an existing secret containing ""
ejbcaJavaOpts Options used to launch the WildFly server ""
ejbcaCA.name Name of the CA EJBCA will instantiate by default ManagementCA
ejbcaCA.baseDN Base DomainName of the CA EJBCA will instantiate by default ""
ejbcaKeystoreExistingSecret Name of an existing Secret containing a Keystore object ""
extraEnvVars Array with extra environment variables to add to EJBCA nodes []
extraEnvVarsCM Name of existing ConfigMap containing extra env vars for EJBCA nodes ""
extraEnvVarsSecret Name of existing Secret containing extra env vars for EJBCA nodes ""
command Custom command to override image cmd []
args Custom args for the custom command []
lifecycleHooks for the EJBCA 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). xlarge
resources Set container requests and limits for different resources like CPU or memory (essential for production workloads) {}
containerSecurityContext.enabled Enabled EJBCA containers’ Security Context true
containerSecurityContext.seLinuxOptions Set SELinux options in container nil
containerSecurityContext.runAsUser Set EJBCA containers’ Security Context runAsUser 1001
containerSecurityContext.runAsGroup Set EJBCA containers’ Security Context runAsGroup 1001
containerSecurityContext.runAsNonRoot Set Controller container’s Security Context runAsNonRoot true
containerSecurityContext.privileged Set primary container’s Security Context privileged false
containerSecurityContext.readOnlyRootFilesystem Set primary container’s Security Context readOnlyRootFilesystem true
containerSecurityContext.allowPrivilegeEscalation Set primary 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
startupProbe.enabled Enable/disable startupProbe false
startupProbe.initialDelaySeconds Delay before startup probe is initiated 500
startupProbe.periodSeconds How often to perform the probe 10
startupProbe.timeoutSeconds When the probe times out 5
startupProbe.failureThreshold Minimum consecutive failures for the probe 6
startupProbe.successThreshold Minimum consecutive successes for the probe 1
livenessProbe.enabled Enable/disable livenessProbe true
livenessProbe.initialDelaySeconds Delay before liveness probe is initiated 500
livenessProbe.periodSeconds How often to perform the probe 10
livenessProbe.timeoutSeconds When the probe times out 5
livenessProbe.failureThreshold Minimum consecutive failures for the probe 6
livenessProbe.successThreshold Minimum consecutive successes for the probe 1
readinessProbe.enabled Enable/disable readinessProbe true
readinessProbe.initialDelaySeconds Delay before readiness probe is initiated 500
readinessProbe.periodSeconds How often to perform the probe 10
readinessProbe.timeoutSeconds When the probe times out 5
readinessProbe.failureThreshold Minimum consecutive failures for the probe 6
readinessProbe.successThreshold Minimum consecutive successes for the probe 1
customStartupProbe Custom startup probe to execute (when the main one is disabled) {}
customLivenessProbe Custom liveness probe to execute (when the main one is disabled) {}
customReadinessProbe Custom readiness probe to execute (when the main one is disabled) {}
containerPorts EJBCA Container ports to open {}
extraContainerPorts Optionally specify extra list of additional ports for EJBCA container(s) []
serviceAccount.create Enable creation of ServiceAccount for EJBCA 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 {}

Service parameters

Name Description Value
service.type Kubernetes Service type LoadBalancer
service.ports.http Service HTTP port 8080
service.ports.https Service HTTPS port 8443
service.advertisedHttpsPort Port number used in the rendered URLs for the admistrator login. 443
service.httpsTargetPort Service Target HTTPS port https
service.nodePorts Node Ports to expose {}
service.clusterIP EJBCA service Cluster IP ""
service.loadBalancerIP EJBCA service Load Balancer IP ""
service.externalTrafficPolicy Enable client source IP preservation Cluster
service.annotations Service annotations {}
service.loadBalancerSourceRanges Limits which cidr blocks can connect to service’s load balancer []
service.extraPorts Extra ports to expose in the service (normally used with the sidecar value) []
service.sessionAffinity Session Affinity for Kubernetes service, can be “None” or “ClientIP” None
service.sessionAffinityConfig Additional settings for the sessionAffinity {}

Ingress parameters

Name Description Value
ingress.enabled Enable ingress controller resource false
ingress.pathType Ingress Path type ImplementationSpecific
ingress.apiVersion Override API Version (automatically detected if not set) ""
ingress.hostname Default host for the ingress resource ejbca.local
ingress.path The Path to EJBCA. You may need to set this to ‘/*’ in order to use this /
ingress.annotations Additional annotations for the Ingress resource. To enable certificate autogeneration, place here your cert-manager annotations. {}
ingress.tls Enable TLS configuration for the hostname defined at ingress.hostname parameter false
ingress.extraHosts The list of additional hostnames to be covered with this ingress record. []
ingress.extraPaths Any additional arbitrary paths that may need to be added to the ingress under the main host. []
ingress.extraTls The tls configuration for additional hostnames to be covered with this ingress record. []
ingress.secrets If you’re providing your own certificates, please use this to add the certificates as secrets []
ingress.ingressClassName IngressClass that will be be used to implement the Ingress (Kubernetes 1.18+) ""
ingress.extraRules Additional rules to be covered with this ingress record []

Database parameters

Name Description Value
mariadb.enabled Whether to deploy a mariadb server to satisfy the applications database requirements. true
mariadb.architecture MariaDB architecture (standalone or replication) standalone
mariadb.auth.rootPassword Password for the MariaDB root user ""
mariadb.auth.database Database name to create bitnami_ejbca
mariadb.auth.username Database user to create bn_ejbca
mariadb.auth.password Password for the database ""
mariadb.primary.persistence.enabled Enable database persistence using PVC true
mariadb.primary.persistence.storageClass MariaDB primary persistent volume storage Class ""
mariadb.primary.persistence.accessMode Persistent Volume access mode ReadWriteOnce
mariadb.primary.persistence.size Database Persistent Volume Size 8Gi
mariadb.primary.persistence.hostPath Set path in case you want to use local host path volumes (not recommended in production) ""
mariadb.primary.persistence.existingClaim Name of an existing PersistentVolumeClaim for MariaDB primary replicas ""
mariadb.primary.resourcesPreset Set container resources according to one common preset (allowed values: none, nano, small, medium, large, xlarge, 2xlarge). This is ignored if primary.resources is set (primary.resources is recommended for production). micro
mariadb.primary.resources Set container requests and limits for different resources like CPU or memory (essential for production workloads) {}
externalDatabase.host Host of the external database localhost
externalDatabase.user non-root Username for EJBCA Database bn_ejbca
externalDatabase.password Password for the above username ""
externalDatabase.existingSecret Name of an existing secret resource containing the DB password in a ‘mariadb-password’ key ""
externalDatabase.database Name of the existing database bitnami_ejbca
externalDatabase.port Database port number 3306

NetworkPolicy parameters

Name Description Value
networkPolicy.enabled Specifies whether a NetworkPolicy should be created true
networkPolicy.allowExternal Don’t require server label for connections true
networkPolicy.allowExternalEgress Allow the pod to access any range of port and all destinations. true
networkPolicy.extraIngress Add extra ingress rules to the NetworkPolicy []
networkPolicy.extraEgress Add extra ingress rules to the NetworkPolicy []
networkPolicy.ingressNSMatchLabels Labels to match to allow traffic from other namespaces {}
networkPolicy.ingressNSPodMatchLabels Pod labels to match to allow traffic from other namespaces {}

The above parameters map to the env variables defined in bitnami/ejbca. For more information please refer to the bitnami/ejbca image documentation.

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

helm install my-release \
  --set ejbcaAdminUsername=admin,ejbcaAdminPassword=password,mariadb.auth.password=secretpassword \
    oci://REGISTRY_NAME/REPOSITORY_NAME/discourse

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 EJBCA administrator account username and password to admin and password respectively. Additionally, it sets the MariaDB bn_ejbca user password to secretpassword.

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 above parameters can be provided while installing the chart. For example,

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

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 14.0.0

This major release bumps the MariaDB chart version to 18.x.x; no major issues are expected during the upgrade.

To 13.0.0

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.
  • The networkPolicy section has been normalized amongst all Bitnami charts. Compared to the previous approach, the values section has been simplified (check the Parameters section) and now it set to enabled=true by default. Egress traffic is allowed by default and ingress traffic is allowed by all pods but only to the ports set in containerPorts and extraContainerPorts.

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 12.0.0

This major release bumps the MariaDB chart version to 16.x. No major issues are expected during the upgrade.

To 11.0.0

This major release bumps the MariaDB version to 11.2. No major issues are expected during the upgrade.

To 10.0.0

This major release bumps the MariaDB version to 11.1. No major issues are expected during the upgrade.

To 9.0.0

This major release only bumps the EJBCA version to 8.x. No major issues are expected during the upgrade. Refer to upstream upgrade notes for more info about the changes included in this new major version of the application.

To 8.0.0

This major release bumps the MariaDB version to 11.0. Follow the upstream instructions for upgrading from MariaDB 10.11 to 11.0. No major issues are expected during the upgrade.

To 7.0.0

This major release bumps the MariaDB version to 10.11. Follow the upstream instructions for upgrading from MariaDB 10.6 to 10.11. No major issues are expected during the upgrade.

To 6.0.0

The MariaDB subchart has been updated to the latest version (now it uses 10.6). No major issues are expected during the upgrade.

To 5.0.0

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.

Affected values:

  • service.port was deprecated, we recommend usingservice.ports.http instead.
  • service.httpsPort was deprecated, we recommend usingservice.port.https instead.
  • extraEnv renamed as extraEnvVars
  • persistence.accessMode has been deprecated, we recommend using persistence.accessModes instead.

Additionally, updates the MariaDB subchart to it newest major, 10.0.0, which contains similar changes.

To 2.0.0

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 1.0.0

MariaDB dependency version was bumped to a new major version that introduces several incompatilibites. Therefore, backwards compatibility is not guaranteed unless an external database is used. Check MariaDB Upgrading Notes for more information.

To upgrade to 1.0.0, you have two alternatives:

  • Install a new EJBCA chart, and migrate your EJBCA following the official documentation.
  • Reuse the PVC used to hold the MariaDB data on your previous release. To do so, follow the instructions below (the following example assumes that the release name is ejbca):

NOTE: Please, create a backup of your database before running any of those actions. The steps below would be only valid if your application (e.g. any plugins or custom code) is compatible with MariaDB 10.5.x

Obtain the credentials and the name of the PVC used to hold the MariaDB data on your current release:

export EJBCA_ADMIN_PASSWORD=$(kubectl get secret --namespace default ejbca -o jsonpath="{.data.ejbca-admin-password}" | base64 -d)
export MARIADB_ROOT_PASSWORD=$(kubectl get secret --namespace default ejbca-mariadb -o jsonpath="{.data.mariadb-root-password}" | base64 -d)
export MARIADB_PASSWORD=$(kubectl get secret --namespace default ejbca-mariadb -o jsonpath="{.data.mariadb-password}" | base64 -d)
export MARIADB_PVC=$(kubectl get pvc -l app=mariadb,component=master,release=ejbca -o jsonpath="{.items[0].metadata.name}")

Upgrade your release (maintaining the version) disabling MariaDB and scaling EJBCA replicas to 0:

helm upgrade ejbca oci://REGISTRY_NAME/REPOSITORY_NAME/ejbca --set ejbcaAdminPassword=$EJBCA_ADMIN_PASSWORD --set replicaCount=0 --set mariadb.enabled=false --version 0.4.0

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.

Finally, upgrade you release to 1.0.0 reusing the existing PVC, and enabling back MariaDB:

helm upgrade ejbca oci://REGISTRY_NAME/REPOSITORY_NAME/ejbca --set mariadb.primary.persistence.existingClaim=$MARIADB_PVC --set mariadb.auth.rootPassword=$MARIADB_ROOT_PASSWORD --set mariadb.auth.password=$MARIADB_PASSWORD --set ejbcaAdminPassword=$EJBCA_ADMIN_PASSWORD

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.

You should see the lines below in MariaDB container logs:

$ kubectl logs $(kubectl get pods -l app.kubernetes.io/instance=ejbca,app.kubernetes.io/name=mariadb,app.kubernetes.io/component=primary -o jsonpath="{.items[0].metadata.name}")
...
mariadb 12:13:24.98 INFO  ==> Using persisted data
mariadb 12:13:25.01 INFO  ==> Running mysql_upgrade
...

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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