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@solsson @danielmai
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# This highly available config creates 3 Dgraph Zeros, 3 Dgraph
# Alphas with 3 replicas, and 1 Ratel UI client. The Dgraph cluster
# will still be available to service requests even when one Zero
# and/or one Alpha are down.
#
# There are 4 public services exposed, users can use:
# dgraph-zero-public - To load data using Live & Bulk Loaders
# dgraph-alpha-public - To connect clients and for HTTP APIs
# dgraph-ratel-public - For Dgraph UI
# dgraph-alpha-x-http-public - Use for debugging & profiling
apiVersion: v1
kind: Service
metadata:
name: dgraph-zero-public
labels:
app: dgraph-zero
spec:
type: LoadBalancer
ports:
- port: 5080
targetPort: 5080
name: zero-grpc
- port: 6080
targetPort: 6080
name: zero-http
selector:
app: dgraph-zero
---
apiVersion: v1
kind: Service
metadata:
name: dgraph-alpha-public
labels:
app: dgraph-alpha
spec:
type: LoadBalancer
ports:
- port: 8080
targetPort: 8080
name: alpha-http
- port: 9080
targetPort: 9080
name: alpha-grpc
selector:
app: dgraph-alpha
---
# This service is created in-order to debug & profile a specific alpha.
# You can create one for each alpha that you need to profile.
# For a more general HTTP APIs use the above service instead.
apiVersion: v1
kind: Service
metadata:
name: dgraph-alpha-0-http-public
labels:
app: dgraph-alpha
spec:
type: LoadBalancer
ports:
- port: 8080
targetPort: 8080
name: alpha-http
selector:
statefulset.kubernetes.io/pod-name: dgraph-alpha-0
---
apiVersion: v1
kind: Service
metadata:
name: dgraph-ratel-public
labels:
app: dgraph-ratel
spec:
type: LoadBalancer
ports:
- port: 8000
targetPort: 8000
name: ratel-http
selector:
app: dgraph-ratel
---
# This is a headless service which is necessary for discovery for a dgraph-zero StatefulSet.
# https://kubernetes.io/docs/tutorials/stateful-application/basic-stateful-set/#creating-a-statefulset
apiVersion: v1
kind: Service
metadata:
name: dgraph-zero
labels:
app: dgraph-zero
spec:
ports:
- port: 5080
targetPort: 5080
name: zero-grpc
clusterIP: None
selector:
app: dgraph-zero
---
# This is a headless service which is necessary for discovery for a dgraph-alpha StatefulSet.
# https://kubernetes.io/docs/tutorials/stateful-application/basic-stateful-set/#creating-a-statefulset
apiVersion: v1
kind: Service
metadata:
name: dgraph-alpha
labels:
app: dgraph-alpha
spec:
ports:
- port: 7080
targetPort: 7080
name: alpha-grpc-int
clusterIP: None
selector:
app: dgraph-alpha
---
# This StatefulSet runs 3 Dgraph Zero.
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: dgraph-zero
spec:
serviceName: "dgraph-zero"
replicas: 3
selector:
matchLabels:
app: dgraph-zero
template:
metadata:
labels:
app: dgraph-zero
spec:
affinity:
podAntiAffinity:
preferredDuringSchedulingIgnoredDuringExecution:
- weight: 100
podAffinityTerm:
labelSelector:
matchExpressions:
- key: app
operator: In
values:
- dgraph-zero
topologyKey: kubernetes.io/hostname
containers:
- name: zero
image: dgraph/dgraph:latest
imagePullPolicy: IfNotPresent
ports:
- containerPort: 5080
name: zero-grpc
- containerPort: 6080
name: zero-http
volumeMounts:
- name: datadir
mountPath: /dgraph
env:
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
command:
- bash
- "-c"
- |
set -ex
[[ `hostname` =~ -([0-9]+)$ ]] || exit 1
ordinal=${BASH_REMATCH[1]}
idx=$(($ordinal + 1))
if [[ $ordinal -eq 0 ]]; then
exec dgraph zero --my=$(hostname -f):5080 --idx $idx --replicas 3
else
exec dgraph zero --my=$(hostname -f):5080 --peer dgraph-zero-0.dgraph-zero.${POD_NAMESPACE}.svc.cluster.local:5080 --idx $idx --replicas 3
fi
terminationGracePeriodSeconds: 60
volumes:
- name: datadir
persistentVolumeClaim:
claimName: datadir
updateStrategy:
type: RollingUpdate
volumeClaimTemplates:
- metadata:
name: datadir
annotations:
volume.alpha.kubernetes.io/storage-class: anything
spec:
accessModes:
- "ReadWriteOnce"
resources:
requests:
storage: 5Gi
---
# This StatefulSet runs 3 replicas of Dgraph Alpha.
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: dgraph-alpha
spec:
serviceName: "dgraph-alpha"
replicas: 3
selector:
matchLabels:
app: dgraph-alpha
template:
metadata:
labels:
app: dgraph-alpha
spec:
affinity:
podAntiAffinity:
preferredDuringSchedulingIgnoredDuringExecution:
- weight: 100
podAffinityTerm:
labelSelector:
matchExpressions:
- key: app
operator: In
values:
- dgraph-alpha
topologyKey: kubernetes.io/hostname
# Initializing the Alphas:
#
# You may want to initialize the Alphas with data before starting, e.g.
# with data from the Dgraph Bulk Loader: https://docs.dgraph.io/deploy/#bulk-loader.
# You can accomplish by uncommenting this initContainers config. This
# starts a container with the same /dgraph volume used by Alpha and runs
# before Alpha starts.
#
# You can copy your local p directory to the pod's /dgraph/p directory
# with this command:
#
# kubectl cp path/to/p dgraph-alpha-0:/dgraph/ -c init-alpha
# (repeat for each alpha pod)
#
# When you're finished initializing each Alpha data directory, you can signal
# it to terminate successfully by creating a /dgraph/doneinit file:
#
# kubectl exec dgraph-alpha-0 -c init-alpha touch /dgraph/doneinit
#
# Note that pod restarts cause re-execution of Init Containers. Since
# /dgraph is persisted across pod restarts, the Init Container will exit
# automatically when /dgraph/doneinit is present and proceed with starting
# the Alpha process.
#
# Tip: StatefulSet pods can start in parallel by configuring
# .spec.podManagementPolicy to Parallel:
#
# https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/#deployment-and-scaling-guarantees
#
# initContainers:
# - name: init-alpha
# image: dgraph/dgraph:latest
# command:
# - bash
# - "-c"
# - |
# echo "Write to /dgraph/doneinit when ready."
# until [ -f /dgraph/doneinit ]; do sleep 2; done
# volumeMounts:
# - name: datadir
# mountPath: /dgraph
containers:
- name: alpha
image: dgraph/dgraph:latest
imagePullPolicy: IfNotPresent
ports:
- containerPort: 7080
name: alpha-grpc-int
- containerPort: 8080
name: alpha-http
- containerPort: 9080
name: alpha-grpc
volumeMounts:
- name: datadir
mountPath: /dgraph
env:
# This should be the same namespace as the dgraph-zero
# StatefulSet to resolve a Dgraph Zero's DNS name for
# Alpha's --zero flag.
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
command:
- bash
- "-c"
- |
set -ex
dgraph alpha --my=$(hostname -f):7080 --lru_mb 2048 --zero dgraph-zero-0.dgraph-zero.${POD_NAMESPACE}.svc.cluster.local:5080
terminationGracePeriodSeconds: 600
volumes:
- name: datadir
persistentVolumeClaim:
claimName: datadir
updateStrategy:
type: RollingUpdate
volumeClaimTemplates:
- metadata:
name: datadir
annotations:
volume.alpha.kubernetes.io/storage-class: anything
spec:
accessModes:
- "ReadWriteOnce"
resources:
requests:
storage: 5Gi
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: dgraph-ratel
labels:
app: dgraph-ratel
spec:
selector:
matchLabels:
app: dgraph-ratel
template:
metadata:
labels:
app: dgraph-ratel
spec:
containers:
- name: ratel
image: dgraph/dgraph:latest
ports:
- containerPort: 8000
command:
- dgraph-ratel
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