CMCC is currently using elasticsearch and influxdb. And they plan to migrate these stateful applications to k8s, using operators. Kudo can satisfy their requirements with only one universal operator.
Deploy the Instance using the following command:
kubectl kudo install elastic --instance myes --parameter COORDINATOR_NODE_COUNT=0
COORDINATOR_NODE_COUNT=0 because they only need master and data nodes.
Once the deployment has finished use the following command.
kubectl get pods
You should see that 3 master, 2 data nodes have been deployed.
NAME READY STATUS RESTARTS AGE
myes-data-0 1/1 Running 0 24m
myes-data-1 1/1 Running 0 24m
myes-master-0 1/1 Running 0 25m
myes-master-1 1/1 Running 0 24m
myes-master-2 1/1 Running 0 24m
Exec into one of the POD's.
kubectl exec -ti myes-master-0 bash
Use the following curl command to check the health of the cluster.
curl myes-master-hs:9200/_cluster/health?pretty
You should see the following output.
{
"cluster_name" : "myes-cluster",
"status" : "green",
"timed_out" : false,
"number_of_nodes" : 5,
"number_of_data_nodes" : 2,
"active_primary_shards" : 0,
"active_shards" : 0,
"relocating_shards" : 0,
"initializing_shards" : 0,
"unassigned_shards" : 0,
"delayed_unassigned_shards" : 0,
"number_of_pending_tasks" : 0,
"number_of_in_flight_fetch" : 0,
"task_max_waiting_in_queue_millis" : 0,
"active_shards_percent_as_number" : 100.0
}
Lets add some data.
curl -X POST "myes-master-hs:9200/twitter/_doc/" -H 'Content-Type: application/json' -d'
{
"user" : "kimchy",
"post_date" : "2009-11-15T14:12:12",
"message" : "trying out Elasticsearch"
}
'
Lets search for the entry.
curl -X GET "myes-master-hs:9200/twitter/_search?q=user:kimchy&pretty"
You should see the following output.
{
"took" : 6,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 1,
"relation" : "eq"
},
"max_score" : 0.2876821,
"hits" : [
{
"_index" : "twitter",
"_type" : "_doc",
"_id" : "n18aemoBCj0qv5VrMWv2",
"_score" : 0.2876821,
"_source" : {
"user" : "kimchy",
"post_date" : "2009-11-15T14:12:12",
"message" : "trying out Elasticsearch"
}
}
]
}
}
kubectl kudo install ./influx
Once the deployment has finished use the following command.
kubectl get instance
You should see the influxdb instance:
NAME AGE
influx-6j7ksk 8m32s
Define and execute a custom plan in order to take a backup:
cat <<EOF | kubectl apply -f -
apiVersion: kudo.dev/v1alpha1
kind: PlanExecution
metadata:
labels:
operator-version: influx-0.1.0
instance: influx-6j7ksk
name: influx-backup
namespace: default
spec:
instance:
kind: Instance
name: influx-6j7ksk
namespace: default
planName: backup
EOF
Similar to the backup step, define and execute the restore:
cat <<EOF | kubectl apply -f -
apiVersion: kudo.dev/v1alpha1
kind: PlanExecution
metadata:
labels:
operator-version: influx-0.1.0
instance: influx-6j7ksk
name: influx-restore
namespace: default
spec:
instance:
kind: Instance
name: influx-6j7ksk
namespace: default
planName: restore
EOF