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README.md

MariaDB

MariaDB is one of the most popular database servers in the world. It’s made by the original developers of MySQL and guaranteed to stay open source. Notable users include Wikipedia, Facebook and Google.

MariaDB is developed as open source software and as a relational database it provides an SQL interface for accessing data. The latest versions of MariaDB also include GIS and JSON features.

TL;DR

$ helm install stable/mariadb

Introduction

This chart bootstraps a MariaDB replication cluster 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. This chart has been tested to work with NGINX Ingress, cert-manager, fluentd and Prometheus on top of the BKPR.

Prerequisites

  • Kubernetes 1.10+
  • PV provisioner support in the underlying infrastructure

Installing the Chart

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

$ helm install --name my-release stable/mariadb

The command deploys MariaDB on the Kubernetes cluster in the default configuration. The configuration section lists the parameters that can be configured during installation.

Tip: List all releases using helm list

Uninstalling the Chart

To uninstall/delete the my-release deployment:

$ helm delete my-release

The command removes all the Kubernetes components associated with the chart and deletes the release.

Configuration

The following table lists the configurable parameters of the MariaDB chart and their default values.

Parameter Description Default
global.imageRegistry Global Docker image registry nil
global.imagePullSecrets Global Docker registry secret names as an array [] (does not add image pull secrets to deployed pods)
image.registry MariaDB image registry docker.io
image.repository MariaDB Image name bitnami/mariadb
image.tag MariaDB Image tag {TAG_NAME}
image.pullPolicy MariaDB image pull policy IfNotPresent
image.pullSecrets Specify docker-registry secret names as an array [] (does not add image pull secrets to deployed pods)
image.debug Specify if debug logs should be enabled false
nameOverride String to partially override mariadb.fullname template with a string (will prepend the release name) nil
fullnameOverride String to fully override mariadb.fullname template with a string nil
service.type Kubernetes service type ClusterIP
service.clusterIp Specific cluster IP when service type is cluster IP. Use None for headless service nil
service.port MySQL service port 3306
serviceAccount.create Specifies whether a ServiceAccount should be created false
serviceAccount.name The name of the ServiceAccount to create Generated using the mariadb.fullname template
schedulerName Name of the k8s scheduler (other than default) nil
rbac.create Create and use RBAC resources false
securityContext.enabled Enable security context true
securityContext.fsGroup Group ID for the container 1001
securityContext.runAsUser User ID for the container 1001
existingSecret Use existing secret for password details (rootUser.password, db.password, replication.password will be ignored and picked up from this secret). The secret has to contain the keys mariadb-root-password, mariadb-replication-password and mariadb-password.
rootUser.password Password for the root user. Ignored if existing secret is provided. random 10 character alphanumeric string
rootUser.forcePassword Force users to specify a password false
db.user Username of new user to create nil
db.password Password for the new user. Ignored if existing secret is provided. random 10 character alphanumeric string if db.user is defined
db.forcePassword Force users to specify a password false
db.name Name for new database to create my_database
replication.enabled MariaDB replication enabled true
replication.user MariaDB replication user replicator
replication.password MariaDB replication user password. Ignored if existing secret is provided. random 10 character alphanumeric string
replication.forcePassword Force users to specify a password false
initdbScripts Dictionary of initdb scripts nil
initdbScriptsConfigMap ConfigMap with the initdb scripts (Note: Overrides initdbScripts) nil
master.annotations[].key key for the the annotation list item nil
master.annotations[].value value for the the annotation list item nil
master.extraFlags MariaDB master additional command line flags nil
master.affinity Master affinity (in addition to master.antiAffinity when set) {}
master.antiAffinity Master pod anti-affinity policy soft
master.nodeSelector Master node labels for pod assignment {}
master.tolerations List of node taints to tolerate (master) []
master.updateStrategy Master statefulset update strategy policy RollingUpdate
master.persistence.enabled Enable persistence using PVC true
master.persistence.existingClaim Provide an existing PersistentVolumeClaim nil
master.persistence.subPath Subdirectory of the volume to mount nil
master.persistence.mountPath Path to mount the volume at /bitnami/mariadb
master.persistence.annotations Persistent Volume Claim annotations {}
master.persistence.storageClass Persistent Volume Storage Class ``
master.persistence.accessModes Persistent Volume Access Modes [ReadWriteOnce]
master.persistence.size Persistent Volume Size 8Gi
master.extraInitContainers Additional init containers as a string to be passed to the tpl function (master)
master.config Config file for the MariaDB Master server _default values in the values.yaml file_
master.resources CPU/Memory resource requests/limits for master node {}
master.livenessProbe.enabled Turn on and off liveness probe (master) true
master.livenessProbe.initialDelaySeconds Delay before liveness probe is initiated (master) 120
master.livenessProbe.periodSeconds How often to perform the probe (master) 10
master.livenessProbe.timeoutSeconds When the probe times out (master) 1
master.livenessProbe.successThreshold Minimum consecutive successes for the probe (master) 1
master.livenessProbe.failureThreshold Minimum consecutive failures for the probe (master) 3
master.readinessProbe.enabled Turn on and off readiness probe (master) true
master.readinessProbe.initialDelaySeconds Delay before readiness probe is initiated (master) 30
master.readinessProbe.periodSeconds How often to perform the probe (master) 10
master.readinessProbe.timeoutSeconds When the probe times out (master) 1
master.readinessProbe.successThreshold Minimum consecutive successes for the probe (master) 1
master.readinessProbe.failureThreshold Minimum consecutive failures for the probe (master) 3
master.podDisruptionBudget.enabled If true, create a pod disruption budget for master pods. false
master.podDisruptionBudget.minAvailable Minimum number / percentage of pods that should remain scheduled 1
master.podDisruptionBudget.maxUnavailable Maximum number / percentage of pods that may be made unavailable nil
slave.replicas Desired number of slave replicas 1
slave.annotations[].key key for the the annotation list item nil
slave.annotations[].value value for the the annotation list item nil
slave.extraFlags MariaDB slave additional command line flags nil
slave.affinity Slave affinity (in addition to slave.antiAffinity when set) {}
slave.antiAffinity Slave pod anti-affinity policy soft
slave.nodeSelector Slave node labels for pod assignment {}
slave.tolerations List of node taints to tolerate for (slave) []
slave.updateStrategy Slave statefulset update strategy policy RollingUpdate
slave.persistence.enabled Enable persistence using a PersistentVolumeClaim true
slave.persistence.annotations Persistent Volume Claim annotations {}
slave.persistence.storageClass Persistent Volume Storage Class ``
slave.persistence.accessModes Persistent Volume Access Modes [ReadWriteOnce]
slave.persistence.size Persistent Volume Size 8Gi
slave.extraInitContainers Additional init containers as a string to be passed to the tpl function (slave)
slave.config Config file for the MariaDB Slave replicas _default values in the values.yaml file_
slave.resources CPU/Memory resource requests/limits for slave node {}
slave.livenessProbe.enabled Turn on and off liveness probe (slave) true
slave.livenessProbe.initialDelaySeconds Delay before liveness probe is initiated (slave) 120
slave.livenessProbe.periodSeconds How often to perform the probe (slave) 10
slave.livenessProbe.timeoutSeconds When the probe times out (slave) 1
slave.livenessProbe.successThreshold Minimum consecutive successes for the probe (slave) 1
slave.livenessProbe.failureThreshold Minimum consecutive failures for the probe (slave) 3
slave.readinessProbe.enabled Turn on and off readiness probe (slave) true
slave.readinessProbe.initialDelaySeconds Delay before readiness probe is initiated (slave) 45
slave.readinessProbe.periodSeconds How often to perform the probe (slave) 10
slave.readinessProbe.timeoutSeconds When the probe times out (slave) 1
slave.readinessProbe.successThreshold Minimum consecutive successes for the probe (slave) 1
slave.readinessProbe.failureThreshold Minimum consecutive failures for the probe (slave) 3
slave.podDisruptionBudget.enabled If true, create a pod disruption budget for slave pods. false
slave.podDisruptionBudget.minAvailable Minimum number / percentage of pods that should remain scheduled 1
slave.podDisruptionBudget.maxUnavailable Maximum number / percentage of pods that may be made unavailable nil
metrics.enabled Start a side-car prometheus exporter false
metrics.image.registry Exporter image registry docker.io
metrics.image.repository Exporter image name prom/mysqld-exporter
metrics.image.tag Exporter image tag v0.10.0
metrics.image.pullPolicy Exporter image pull policy IfNotPresent
metrics.resources Exporter resource requests/limit nil
metrics.serviceMonitor.enabled if true, creates a Prometheus Operator ServiceMonitor (also requires metrics.enabled to be true) false
metrics.serviceMonitor.namespace Optional namespace which Prometheus is running in nil
metrics.serviceMonitor.interval How frequently to scrape metrics (use by default, falling back to Prometheus' default) nil
metrics.serviceMonitor.selector Default to kube-prometheus install (CoreOS recommended), but should be set according to Prometheus install { prometheus: kube-prometheus }

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

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

$ helm install --name my-release \
  --set rootUser.password=secretpassword,db.user=app_database \
    stable/mariadb

The above command sets the MariaDB root account password to secretpassword. Additionally it creates a database named my_database.

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

$ helm install --name my-release -f values.yaml stable/mariadb

Tip: You can use the default values.yaml

Production configuration

This chart includes a values-production.yaml file where you can find some parameters oriented to production configuration in comparison to the regular values.yaml.

$ helm install --name my-release -f ./values-production.yaml stable/mariadb
  • Force users to specify a password:
- rootUser.forcePassword: false
+ rootUser.forcePassword: true
- db.forcePassword: false
+ db.forcePassword: true
- replication.forcePassword: false
+ replication.forcePassword: true
  • Desired number of slave replicas:
- slave.replicas: 1
+ slave.replicas: 2
  • Start a side-car prometheus exporter:
- metrics.enabled: false
+ metrics.enabled: true

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.

Initialize a fresh instance

The Bitnami MariaDB image allows you to use your custom scripts to initialize a fresh instance. In order to execute the scripts, they must be located inside the chart folder files/docker-entrypoint-initdb.d so they can be consumed as a ConfigMap.

Alternatively, you can specify custom scripts using the initdbScripts parameter as dict.

In addition to these options, you can also set an external ConfigMap with all the initialization scripts. This is done by setting the initdbScriptsConfigMap parameter. Note that this will override the two previous options.

The allowed extensions are .sh, .sql and .sql.gz.

Persistence

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

The chart mounts a Persistent Volume volume at this location. The volume is created using dynamic volume provisioning, by default. An existing PersistentVolumeClaim can be defined.

Extra Init Containers

The feature allows for specifying a template string for a initContainer in the master/slave pod. Usecases include situations when you need some pre-run setup. For example, in IKS (IBM Cloud Kubernetes Service), non-root users do not have write permission on the volume mount path for NFS-powered file storage. So, you could use a initcontainer to chown the mount. See a example below, where we add an initContainer on the master pod that reports to an external resource that the db is going to starting. values.yaml

master:
  extraInitContainers: |
    - name: initcontainer
      image: bitnami/minideb:latest
      command: ["/bin/sh", "-c"]
      args:
        - install_packages curl && curl http://api-service.local/db/starting;

Upgrading

It's necessary to set the rootUser.password parameter when upgrading for readiness/liveness probes to work properly. When you install this chart for the first time, some notes will be displayed providing the credentials you must use under the 'Administrator credentials' section. Please note down the password and run the command below to upgrade your chart:

$ helm upgrade my-release stable/mariadb --set rootUser.password=[ROOT_PASSWORD]

| Note: you need to substitute the placeholder [ROOT_PASSWORD] with the value obtained in the installation notes.

To 6.0.0

MariaDB version was updated from 10.1 to 10.3, there are no changes in the chart itself. According to the official documentation, upgrading from 10.1 should be painless. However, there are some things that have changed which could affect an upgrade:

To 5.0.0

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 5.0.0. The following example assumes that the release name is mariadb:

$ kubectl delete statefulset opencart-mariadb --cascade=false
You can’t perform that action at this time.