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Manage KubeDB objects using CLIs
KubeDB CLI
KubeDB comes with its own cli. It is called kubedb cli. kubedb can be used to manage any KubeDB object. kubedb cli also performs various validations to improve ux. To install KubeDB cli on your workstation, follow the steps here.
How to Create objects
kubectl create creates a database CRD object in default namespace by default. Following command will create a Redis object as specified in redis.yaml.
$ kubectl create -f redis-demo.yaml
redis.kubedb.com/redis-demo created
You can provide namespace as a flag --namespace. Provided namespace should match with namespace specified in input file.
$ kubectl create -f redis-demo.yaml --namespace=kube-system
redis.kubedb.com/redis-demo created
kubectl create command also considers stdin as input.
cat redis-demo.yaml | kubectl create -f -
How to List Objects
kubectl get command allows users to list or find any KubeDB object. To list all Redis objects in default namespace, run the following command:
$ kubectl get redis
NAME VERSION STATUS AGE
redis-demo 4.0-v1 Running 13s
redis-dev 4.0-v1 Running 13s
redis-prod 4.0-v1 Running 13s
redis-qa 4.0-v1 Running 13s
To get YAML of an object, use --output=yaml flag.
$ kubectl get redis redis-demo --output=yaml
apiVersion: kubedb.com/v1
kind: Redis
metadata:
creationTimestamp: 2018-10-01T08:14:27Z
finalizers:
- kubedb.com
generation: 1
labels:
kubedb: cli-demo
name: redis-demo
namespace: demo
resourceVersion: "18201"
selfLink: /apis/kubedb.com/v1/namespaces/default/redises/redis-demo
uid: 039aeaa1-c552-11e8-9ba7-0800274bef12
spec:
mode: Standalone
podTemplate:
controller: {}
metadata: {}
spec:
resources: {}
replicas: 1
storage:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
storageClassName: standard
storageType: Durable
deletionPolicy: Halt
version: 4.0-v1
status:
observedGeneration: 1$7916315637361465932
phase: Running
To get JSON of an object, use --output=json flag.
kubectl get redis redis-demo --output=json
To list all KubeDB objects, use following command:
$ kubectl get all -o wide
NAME VERSION STATUS AGE
redis.kubedb.com/redis-demo 4.0-v1 Running 3m
redis.kubedb.com/redis-dev 4.0-v1 Running 3m
redis.kubedb.com/redis-prod 4.0-v1 Running 3m
redis.kubedb.com/redis-qa 4.0-v1 Running 3m
Flag --output=wide is used to print additional information.
List command supports short names for each object types. You can use it like kubectl get <short-name>. Below are the short name for KubeDB objects:
- Redis:
rd - DormantDatabase:
drmn
You can print labels with objects. The following command will list all Redis with their corresponding labels.
$ kubectl get rd --show-labels
NAME VERSION STATUS AGE LABELS
redis-demo 4.0-v1 Running 4m kubedb=cli-demo
To print only object name, run the following command:
$ kubectl get all -o name
redis/redis-demo
redis/redis-dev
redis/redis-prod
redis/redis-qa
How to Describe Objects
kubectl dba describe command allows users to describe any KubeDB object. The following command will describe Redis server redis-demo with relevant information.
$ kubectl dba describe rd redis-demo
Name: redis-demo
Namespace: default
CreationTimestamp: Mon, 01 Oct 2018 14:14:27 +0600
Labels: kubedb=cli-demo
Annotations: <none>
Replicas: 1 total
Status: Running
StorageType: Durable
Volume:
StorageClass: standard
Capacity: 1Gi
Access Modes: RWO
PetSet:
Name: redis-demo
CreationTimestamp: Mon, 01 Oct 2018 14:14:31 +0600
Labels: kubedb=cli-demo
app.kubernetes.io/name=redises.kubedb.com
app.kubernetes.io/instance=redis-demo
Annotations: <none>
Replicas: 824640807604 desired | 1 total
Pods Status: 1 Running / 0 Waiting / 0 Succeeded / 0 Failed
Service:
Name: redis-demo
Labels: app.kubernetes.io/name=redises.kubedb.com
app.kubernetes.io/instance=redis-demo
Annotations: <none>
Type: ClusterIP
IP: 10.102.148.196
Port: db 6379/TCP
TargetPort: db/TCP
Endpoints: 172.17.0.4:6379
No Snapshots.
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Successful 5m Redis operator Successfully created Service
Normal Successful 5m Redis operator Successfully created PetSet
Normal Successful 5m Redis operator Successfully created Redis
Normal Successful 5m Redis operator Successfully patched PetSet
Normal Successful 5m Redis operator Successfully patched Redis
kubectl dba describe command provides following basic information about a Redis server.
- PetSet
- Storage (Persistent Volume)
- Service
- Monitoring system (If available)
To hide events on KubeDB object, use flag --show-events=false
To describe all Redis objects in default namespace, use following command
kubectl dba describe rd
To describe all Redis objects from every namespace, provide --all-namespaces flag.
kubectl dba describe rd --all-namespaces
To describe all KubeDB objects from every namespace, use the following command:
kubectl dba describe all --all-namespaces
You can also describe KubeDB objects with matching labels. The following command will describe all Redis objects with specified labels from every namespace.
kubectl dba describe rd --all-namespaces --selector='group=dev'
To learn about various options of describe command, please visit here.
How to Edit Objects
kubectl edit command allows users to directly edit any KubeDB object. It will open the editor defined by KUBEDB_EDITOR, or EDITOR environment variables, or fall back to nano.
Let’s edit an existing running Redis object to setup Monitoring. The following command will open Redis redis-demo in editor.
$ kubectl edit rd redis-demo
#spec:
# monitor:
# agent: prometheus.io/builtin
redis "redis-demo" edited
Edit Restrictions
Various fields of a KubeDB object can’t be edited using edit command. The following fields are restricted from updates for all KubeDB objects:
- apiVersion
- kind
- metadata.name
- metadata.namespace
If PetSets exists for a Redis server, following fields can’t be modified as well.
- spec.storageType
- spec.storage
- spec.podTemplate.spec.nodeSelector
- spec.podTemplate.spec.env
For DormantDatabase, spec.origin can’t be edited using kubectl edit
How to Delete Objects
kubectl delete command will delete an object in default namespace by default unless namespace is provided. The following command will delete a Redis redis-dev in default namespace
$ kubectl delete redis redis-dev
redis.kubedb.com "redis-dev" deleted
You can also use YAML files to delete objects. The following command will delete a redis using the type and name specified in redis.yaml.
$ kubectl delete -f redis-demo.yaml
redis.kubedb.com "redis-dev" deleted
kubectl delete command also takes input from stdin.
cat redis-demo.yaml | kubectl delete -f -
To delete database with matching labels, use --selector flag. The following command will delete redis with label redis.app.kubernetes.io/instance=redis-demo.
kubectl delete redis -l redis.app.kubernetes.io/instance=redis-demo
Using Kubectl
You can use Kubectl with KubeDB objects like any other CRDs. Below are some common examples of using Kubectl with KubeDB objects.
# List objects
$ kubectl get redis
$ kubectl get redis.kubedb.com
# Delete objects
$ kubectl delete redis <name>
Next Steps
- Learn how to use KubeDB to run a Redis server here.
- Learn how to use custom configuration in Redis with KubeDB here
- Want to hack on KubeDB? Check our contribution guidelines.