0ca1a7942e
This is a major refactor of the mariadb chart. A few things
are accomplished:
* The chart template layout is updated to match our keystone
chart, providing a more structure to the chart.
* The chart was updated to leverage StatefulSets, which requires
Kubernetes 1.5, and helm 2.1.0.
* The bootstrapping process was completely overhauled to support
the unique constraints of statefulsets, namely that they come up
one by one, needing the previous to be in a ready state before
the next is provisioned.
* The references to {{ .IP }} we removed and replaced with POD_IP
environmental passing and address binding was fixed in several
places for wsrep functionality. This may explain several oddities
with the previous setup causing mysterious and intermittent
database consistency issues.
162 lines
5.0 KiB
YAML
162 lines
5.0 KiB
YAML
---
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apiVersion: apps/v1beta1
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kind: StatefulSet
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metadata:
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name: {{ .Values.service_name }}
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spec:
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serviceName: "{{ .Values.service_name }}"
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replicas: 3
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template:
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metadata:
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labels:
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app: {{ .Values.service_name }}
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galera: enabled
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annotations:
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# alanmeadows: this soft requirement allows single
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# host deployments to spawn several mariadb containers
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# but in a larger environment, would attempt to spread
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# them out
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scheduler.alpha.kubernetes.io/affinity: >
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{
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"podAntiAffinity": {
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"preferredDuringSchedulingIgnoredDuringExecution": [{
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"labelSelector": {
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"matchExpressions": [{
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"key": "app",
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"operator": "In",
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"values":["mariadb"]
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}]
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},
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"topologyKey": "kubernetes.io/hostname",
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"weight": 10
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}]
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}
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}
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spec:
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nodeSelector:
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{{ .Values.labels.node_selector_key }}: {{ .Values.labels.node_selector_value }}
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containers:
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- name: {{ .Values.service_name }}
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image: {{ .Values.images.mariadb }}
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imagePullPolicy: Always
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env:
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- name: INTERFACE_NAME
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value: "eth0"
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- name: POD_NAME
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valueFrom:
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fieldRef:
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fieldPath: metadata.name
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- name: POD_IP
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valueFrom:
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fieldRef:
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fieldPath: status.podIP
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- name: NAMESPACE
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valueFrom:
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fieldRef:
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fieldPath: metadata.namespace
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- name: COMMAND
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value: "bash /tmp/start.sh"
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ports:
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- containerPort: {{ .Values.network.port.mariadb }}
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- containerPort: {{ .Values.network.port.wsrep }}
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- containerPort: {{ .Values.network.port.ist }}
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# a readinessprobe is a much more complex affair with
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# statefulsets, as the container must be "live"
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# before the next stateful member is created
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# and with galera this is problematic
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readinessProbe:
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exec:
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command:
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- python
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- /mariadb-readiness.py
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initialDelaySeconds: 60
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volumeMounts:
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- name: mycnfd
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mountPath: /etc/my.cnf.d
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- name: startsh
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mountPath: /tmp/start.sh
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subPath: start.sh
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- name: bootstrapdb
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mountPath: /tmp/bootstrap-db.sh
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subPath: bootstrap-db.sh
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- name: peerfinder
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mountPath: /tmp/peer-finder.py
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subPath: peer-finder.py
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- name: readiness
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mountPath: /mariadb-readiness.py
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subPath: readiness.py
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- name: charsets
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mountPath: /etc/my.cnf.d/charsets.cnf
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subPath: charsets.cnf
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- name: engine
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mountPath: /etc/my.cnf.d/engine.cnf
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subPath: engine.cnf
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- name: log
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mountPath: /etc/my.cnf.d/log.cnf
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subPath: log.cnf
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- name: mycnf
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mountPath: /etc/my.cnf
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subPath: my.cnf
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- name: networking
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mountPath: /etc/my.cnf.d/networking.cnf
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subPath: networking.cnf
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- name: pid
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mountPath: /etc/my.cnf.d/pid.cnf
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subPath: pid.cnf
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- name: tuning
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mountPath: /etc/my.cnf.d/tuning.cnf
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subPath: tuning.cnf
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- name: wsrep
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mountPath: /etc/my.cnf.d/wsrep.cnf
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subPath: wsrep.cnf
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- name: mysql-data
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mountPath: /var/lib/mysql
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volumes:
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- name: mycnfd
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emptyDir: {}
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- name: startsh
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configMap:
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name: mariadb-bin
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- name: bootstrapdb
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configMap:
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name: mariadb-bin
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- name: peerfinder
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configMap:
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name: mariadb-bin
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- name: readiness
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configMap:
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name: mariadb-bin
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- name: charsets
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configMap:
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name: mariadb-etc
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- name: engine
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configMap:
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name: mariadb-etc
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- name: log
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configMap:
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name: mariadb-etc
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- name: mycnf
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configMap:
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name: mariadb-etc
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- name: networking
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configMap:
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name: mariadb-etc
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- name: pid
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configMap:
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name: mariadb-etc
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- name: tuning
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configMap:
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name: mariadb-etc
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- name: wsrep
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configMap:
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name: mariadb-etc
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volumeClaimTemplates:
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- metadata:
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name: mysql-data
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annotations:
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{{ .Values.volume.class_path }}: {{ .Values.volume.class_name }}
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spec:
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accessModes: [ "ReadWriteOnce" ]
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resources:
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requests:
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storage: {{ .Values.volume.size }} |