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Initialize MongoDB with Snapshot
This tutorial will show you how to use KubeDB to initialize a MongoDB database with an existing snapshot.
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.
This tutorial assumes that you have created a namespace demo and a snapshot snapshot-infant. Follow the steps here to create a database and take instant snapshot, if you have not done so already. If you have changed the name of either namespace or snapshot object, please modify the YAMLs used in this tutorial accordingly.
Note that the yaml files that are used in this tutorial, stored in docs/examples folder in GitHub repository kubedb/cli.
Create MongoDB with Init-Snapshot
Below is the MongoDB object created in this tutorial.
apiVersion: kubedb.com/v1alpha1
kind: MongoDB
metadata:
name: mgo-init-snapshot
namespace: demo
spec:
version: "3.4"
storage:
storageClassName: "standard"
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 50Mi
init:
snapshotSource:
name: snapshot-infant
namespace: demo
$ kubedb create -f https://raw.githubusercontent.com/kubedb/cli/0.8.0/docs/examples/mongodb/Initialization/demo-2.yaml
mongodb "mgo-init-snapshot" created
Here,
spec.init.snapshotSource.namerefers to a Snapshot object for a MongoDB database in the same namespaces as this newmgo-init-snapshotMongoDB object.
Now, wait several seconds. KubeDB operator will create a new StatefulSet. Then KubeDB operator launches a Kubernetes Job to initialize the new database using the data from snapshot-infant Snapshot.
$ kubedb get mg -n demo
NAME STATUS AGE
mgo-infant Running 24m
mgo-init-snapshot Initializing 6s
$ kubedb describe mg -n demo mgo-init-snapshot
Name: mgo-init-snapshot
Namespace: demo
StartTimestamp: Tue, 06 Feb 2018 10:34:30 +0600
Status: Running
Annotations: kubedb.com/initialized=
Volume:
StorageClass: standard
Capacity: 50Mi
Access Modes: RWO
StatefulSet:
Name: mgo-init-snapshot
Replicas: 1 current / 1 desired
CreationTimestamp: Tue, 06 Feb 2018 10:11:54 +0600
Pods Status: 1 Running / 0 Waiting / 0 Succeeded / 0 Failed
Service:
Name: mgo-init-snapshot
Type: ClusterIP
IP: 10.100.233.80
Port: db 27017/TCP
Database Secret:
Name: mgo-init-snapshot-auth
Type: Opaque
Data
====
password: 16 bytes
user: 4 bytes
No Snapshots.
Events:
FirstSeen LastSeen Count From Type Reason Message
--------- -------- ----- ---- -------- ------ -------
1m 1m 1 MongoDB operator Normal Successful Successfully patched StatefulSet
1m 1m 1 MongoDB operator Normal Successful Successfully patched MongoDB
1m 1m 1 Job Controller Normal SuccessfulInitialize Successfully completed initialization
1m 1m 1 MongoDB operator Normal Successful Successfully patched StatefulSet
1m 1m 1 MongoDB operator Normal Successful Successfully patched MongoDB
1m 1m 1 MongoDB operator Normal Initializing Initializing from Snapshot: "snapshot-infant"
1m 1m 1 MongoDB operator Normal Successful Successfully patched StatefulSet
1m 1m 1 MongoDB operator Normal Successful Successfully patched MongoDB
Cleaning up
To cleanup the Kubernetes resources created by this tutorial, run:
$ kubectl patch -n demo mg/mgo-infant mg/mgo-init-snapshot -p '{"spec":{"doNotPause":false}}' --type="merge"
$ kubectl delete -n demo mg/mgo-infant mg/mgo-init-snapshot
$ kubectl patch -n demo drmn/mgo-infant drmn/mgo-init-snapshot -p '{"spec":{"wipeOut":true}}' --type="merge"
$ kubectl delete -n demo drmn/mgo-infant drmn/mgo-init-snapshot
$ kubectl delete ns demo
namespace "demo" deleted
Next Steps
- Monitor your MongoDB database with KubeDB using out-of-the-box CoreOS Prometheus Operator.
- Monitor your MongoDB database with KubeDB using out-of-the-box builtin-Prometheus.
- Use private Docker registry to deploy MongoDB with KubeDB.
- Detail concepts of MongoDB object.
- Detail concepts of Snapshot object.
- Wondering what features are coming next? Please visit here.
- Want to hack on KubeDB? Check our contribution guidelines.