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Initialize Elasticsearch with Snapshot
KubeDB supports Elasticsearch database initialization.
Before You Begin
At first, you need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster. If you do not already have a cluster, you can create one by using Minikube.
Now, install KubeDB cli on your workstation and KubeDB operator in your cluster following the steps here.
To keep things isolated, this tutorial uses a separate namespace called demo throughout this tutorial.
$ kubectl create ns demo
namespace/demo created
$ kubectl get ns demo
NAME STATUS AGE
demo Active 5s
Note: YAML files used in this tutorial are stored in docs/examples/elasticsearch folder in GitHub repository kubedb/cli.
Prepare Snapshot
This tutorial will show you how to use KubeDB to initialize an Elasticsearch database with an existing Snapshot. So, we need a Snapshot to perform this initialization. If you don’t have a Snapshot already, create one by following the tutorial here.
If you have changed either namespace or snapshot object name, please modify the YAMLs used in this tutorial accordingly.
Initialize with Snapshot source
You have to specify the Snapshot name and namespace in the spec.init.snapshotSource field of your new Elasticsearch object.
Below is the YAML for Elasticsearch object that will be created in this tutorial.
apiVersion: kubedb.com/v1alpha1
kind: Elasticsearch
metadata:
name: recovered-es
namespace: demo
spec:
version: "6.3-v1"
databaseSecret:
secretName: infant-elasticsearch-auth
storageType: Durable
storage:
storageClassName: "standard"
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
init:
snapshotSource:
name: instant-snapshot
namespace: demo
Here,
spec.init.snapshotSourcespecifies Snapshot object information to be used in this initialization process.snapshotSource.namerefers to a Snapshot objectname.snapshotSource.namespacerefers to a Snapshot objectnamespace.
Snapshot instant-snapshot in demo namespace belongs to Elasticsearch infant-elasticsearch:
$ kubectl get snap -n demo instant-snapshot
NAME DATABASENAME STATUS AGE
instant-snapshot infant-elasticsearch Succeeded 51m
Note: Elasticsearch
recovered-esmust have same superuser credentials as Elasticsearchinfant-elasticsearch.
Now, create the Elasticsearch object.
$ kubectl create -f https://raw.githubusercontent.com/kubedb/cli/0.10.0/docs/examples/elasticsearch/initialization/recovered-es.yaml
elasticsearch.kubedb.com/recovered-es created
When Elasticsearch database is ready, KubeDB operator launches a Kubernetes Job to initialize this database using the data from Snapshot instant-snapshot.
As a final step of initialization, KubeDB Job controller adds kubedb.com/initialized annotation in initialized Elasticsearch object. This prevents further invocation of initialization process.
$ kubedb describe es -n demo recovered-es
Name: recovered-es
Namespace: demo
CreationTimestamp: Mon, 08 Oct 2018 12:37:19 +0600
Labels: <none>
Annotations: kubectl.kubernetes.io/last-applied-configuration={"apiVersion":"kubedb.com/v1alpha1","kind":"Elasticsearch","metadata":{"annotations":{},"name":"recovered-es","namespace":"demo"},"spec":{"databaseSecr...
kubedb.com/initialized
Status: Running
Replicas: 1 total
Init:
snapshotSource:
namespace: demo
name: instant-snapshot
StorageType: Durable
Volume:
StorageClass: standard
Capacity: 1Gi
Access Modes: RWO
StatefulSet:
Name: recovered-es
CreationTimestamp: Mon, 08 Oct 2018 12:37:21 +0600
Labels: kubedb.com/kind=Elasticsearch
kubedb.com/name=recovered-es
node.role.client=set
node.role.data=set
node.role.master=set
Annotations: <none>
Replicas: 824638233976 desired | 1 total
Pods Status: 1 Running / 0 Waiting / 0 Succeeded / 0 Failed
Service:
Name: recovered-es
Labels: kubedb.com/kind=Elasticsearch
kubedb.com/name=recovered-es
Annotations: <none>
Type: ClusterIP
IP: 10.104.209.94
Port: http 9200/TCP
TargetPort: http/TCP
Endpoints: 192.168.1.14:9200
Service:
Name: recovered-es-master
Labels: kubedb.com/kind=Elasticsearch
kubedb.com/name=recovered-es
Annotations: <none>
Type: ClusterIP
IP: 10.110.233.136
Port: transport 9300/TCP
TargetPort: transport/TCP
Endpoints: 192.168.1.14:9300
Database Secret:
Name: infant-elasticsearch-auth
Labels: kubedb.com/kind=Elasticsearch
kubedb.com/name=infant-elasticsearch
Annotations: <none>
Type: Opaque
Data
====
ADMIN_PASSWORD: 8 bytes
ADMIN_USERNAME: 5 bytes
sg_action_groups.yml: 430 bytes
sg_internal_users.yml: 156 bytes
sg_roles.yml: 312 bytes
sg_roles_mapping.yml: 73 bytes
READALL_PASSWORD: 8 bytes
READALL_USERNAME: 7 bytes
sg_config.yml: 242 bytes
Certificate Secret:
Name: recovered-es-cert
Labels: kubedb.com/kind=Elasticsearch
kubedb.com/name=recovered-es
Annotations: <none>
Type: Opaque
Data
====
sgadmin.jks: 3011 bytes
key_pass: 6 bytes
node.jks: 3008 bytes
root.jks: 864 bytes
Topology:
Type Pod StartTime Phase
---- --- --------- -----
master|client|data recovered-es-0 2018-10-08 12:37:22 +0600 +06 Running
No Snapshots.
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Successful 35m Elasticsearch operator Successfully created Service
Normal Successful 35m Elasticsearch operator Successfully created Service
Normal Successful 35m Elasticsearch operator Successfully created StatefulSet
Normal Successful 34m Elasticsearch operator Successfully created Elasticsearch
Normal Initializing 34m Elasticsearch operator Initializing from Snapshot: "instant-snapshot"
Normal Successful 34m Elasticsearch operator Successfully patched StatefulSet
Normal Successful 34m Elasticsearch operator Successfully patched Elasticsearch
Normal SuccessfulInitialize 33m Job Controller Successfully completed initialization
Verify initialization
Let’s connect to our Elasticsearch recovered-es to verify that the database has been successfully initialized.
At first, forward 9200 port of recovered-es pod. Run following command on a separate terminal,
$ kubectl port-forward -n demo recovered-es-0 9200
Forwarding from 127.0.0.1:9200 -> 9200
Forwarding from [::1]:9200 -> 9200
Now, we can connect to the database at localhost:9200. Let’s find out necessary connection information first.
Connection information:
Address:
localhost:9200Username: Run following command to get username
$ kubectl get secrets -n demo infant-elasticsearch-auth -o jsonpath='{.data.\ADMIN_USERNAME}' | base64 -d adminPassword: Run following command to get password
$ kubectl get secrets -n demo infant-elasticsearch-auth -o jsonpath='{.data.\ADMIN_PASSWORD}' | base64 -d cfgn547j
We had created an index test before taking snapshot of infant-elasticsearch database. Let’s check this index is present in newly initialized database recovered-es.
$ curl -XGET --user "admin:cfgn547j" "localhost:9200/test/snapshot/1?pretty"
{
"_index" : "test",
"_type" : "snapshot",
"_id" : "1",
"_version" : 33,
"found" : true,
"_source" : {
"title" : "Snapshot",
"text" : "Testing instand backup",
"date" : "2018/02/13"
}
}
We can see from above output that test index is present in recovered-es database. That’s means our database has been initialized from snapshot successfully.
Cleaning up
To cleanup the Kubernetes resources created by this tutorial, run:
$ kubectl patch -n demo es/infant-elasticsearch es/recovered-es -p '{"spec":{"terminationPolicy":"WipeOut"}}' --type="merge"
$ kubectl delete -n demo es/infant-elasticsearch es/recovered-es
$ kubectl delete ns demo
Next Steps
- Learn how to schedule backup of Elasticsearch database.
- Learn how to configure Elasticsearch Topology.
- Monitor your Elasticsearch database with KubeDB using
out-of-the-boxbuiltin-Prometheus. - Monitor your Elasticsearch database with KubeDB using
out-of-the-boxCoreOS Prometheus Operator. - Use private Docker registry to deploy Elasticsearch with KubeDB.
- Want to hack on KubeDB? Check our contribution guidelines.