Digit Helm Deployment Common Chart

The common library chart has templates which eases deployment of a service on to Digit with recommended platform defaults which can further be customized to service or environment needs while abstracting the need to know kubernetes manifest syntax.

This helps us push defaults and changes to most, if not all, services deployed onto Digit.

Requirements

The default values file values.yaml has defaults for all manifest files, which can be overrides by service values file or environment override file.

The service template file _service.yaml used for generating a service manifest.

The ingress template file _ingress.yaml used for generating ingress manifest.

The deployment template file _deployment.yaml used for generating a deployment manifest.

Values template

Parameter	Description	Default
namespace	Default namespace for the service	egov
replicas	Number of Pods to be created	1
httpPort	Default port number for the service	8080
appType	Application Type to configure defaults for appType, "java-spring" only type with defaults for now. For more details check values.yaml
labels	Labels for the service, for example, app: "egov-mdms-service" group: "core"	''
ingress.enabled	To add ingress controller for the service	false
ingress.zuul	When ingress is enabled, routes the request via Zuul API gateway	false
ingress.context	When ingress is enabled, exposes the following context path to the internet, example user	``
ingress.waf.enabled	When ingress is enabled, Enable Web Application Firewall for the service	true
image.pullPolicy	To pull a Docker image from Docker repository, By default skip pulling an image if it already exists	IfNotPresent
image.tag	Docker image tag for the service	latest
affinity.preferSpreadAcrossAZ	To spread deployment replicas across multiple availability zones in cloud environment	true
initContainers.dbMigration.enabled	Add Flyway DB migration container for the service, requires schemaTable configuration!	false
initContainers.dbMigration.schemaTable	Schema table for the flyway db migration, required, if db migration enabled,	''
initContainers.dbMigration.image.pullPolicy	Pulls the DB migration docker images from Docker repository	IfNotPresent
initContainers.dbMigration.image.tag	Docker image tag for the initcontainer	latest
initContainers.dbMigration.env	Allows the specification of additional environment variables. Passed through the tpl function and thus to be configured a string	For Eg: env: |         - name: "FLYWAY_USER"             valueFrom:                 secretKeyRef:                         name: db                         key: flyway-username For more details check values.yaml
initContainers.gitSync.enabled	To add a gitSync init container which clones a repository using configured ssh read token	false
initContainers.gitSync.repo	Git repository to be checked out, required, if gitSync enabled, example, [email protected]:egovernments/egov-mdms-data	''
initContainers.gitSync.branch	Git repository branch to be checked out, required, if gitSync enabled, example, master	''
gitSync.image.repository	Docker image of the gitSync init container	k8s.gcr.io/git-sync
gitSync.image.tag	Docker image tag of the gitSync init container	v3.1.1
gitSync.image.pullPolicy	Docker image pull policy for gitSync init container	IfNotPresent
gitSync.env	Allows the specification of additional environment variables. Passed through the tpl function and thus to be configured a string	For Eg: env: |         - name: "GIT_SYNC_REPO"             value: "{{ .Values.initContainers.gitSync.repo }}" For more details check values.yaml
healthChecks.enabled	To enable/disable healthchecks [Liveness probes and Readiness probes] for a pod	false
healthChecks.livenessProbe	Allows the specification of additional environment variables. Passed through the tpl function and thus to be configured a string	For Eg: livenessProbe: |         httpGet:                 path: "{{ .Values.healthChecks.livenessProbePath }}"         initialDelaySeconds: 60 For more details check values.yaml
healthChecks.livenessProbe.httpGet.path	Context path of the service to check the liveness of a pod	{{ .Values.healthChecks.livenessProbePath }}
healthChecks.livenessProbe.httpGet.port	Port number of the service to check the liveness of a pod	{{ .Values.httpPort }}
healthChecks.readinessProbe	Allows the specification of additional environment variables. Passed through the tpl function and thus to be configured a string	For Eg: readinessProbe: |         httpGet:                 path: "{{ .Values.healthChecks.readinessProbePath }}"         initialDelaySeconds: 60 For more details check values.yaml
healthChecks.readinessProbe.httpGet.path	Context path of the service to check the readiness of a pod	{{ .Values.healthChecks.readinessProbePath }}
healthChecks.readinessProbe.httpGet.port	Port number of the service to check the readiness of a pod	{{ .Values.httpPort }}
lifecycle.preStop.exec.command	Executes the command in the pod before stopping	- sh - -c - "sleep 10"
memory_limits	To set the memory limit for the pod	512Mi
resources	To set the resource limits for the pod. Allows the specification of additional environment variables. Passed through the tpl function and thus to be configured a string	resources: |     {{- if eq .Values.appType "java-spring" -}}     requests:         memory: {{ .Values.memory_limits | quote }}     limits:         memory: {{ .Values.memory_limits | quote }}     {{- end -}}
extraEnv.java	Allows the specification of additional environment variables for Java. Passed through the tpl function and thus to be configured a string	For Eg: java: |         - name: SPRING_DATASOURCE_URL             valueFrom:                 configMapKeyRef:                     name: egov-config                     key: db-url For more details check values.yaml
jaeger	Jaeger API tracing environment variables to send traces to Jaeger Agent. Allows the specification of additional environment variables. Passed through the tpl function and thus to be configured a string	For Eg: jaeger: |         - name: JAEGER_AGENT_PORT             port: 6831 For more details check values.yaml
extraVolumes	To add additional volumes to the service. Allows the specification of additional environment variables. Passed through the tpl function and thus to be configured a string	For Eg: extraVolumes: |     - name: new-volume         configMap:             name: service-new-volume
extraVolumeMounts	To mount additional volumes to the service in a desired mount path. Allows the specification of additional environment variables. Passed through the tpl function and thus to be configured a string	For Eg: extraVolumeMounts: |     - mountPath: /opt/service-path/file.conf         configMap:             name: new-volume             subPath: file.conf
extraInitContainers	Additional init containers, e. g. for providing themes, etc. Passed through the tpl function and thus to be configured a string	""
extraContainers	Additional sidecar containers, e. g. for a database proxy, such as Google's cloudsql-proxy. Passed through the tpl function and thus to be configured a string	""