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Paulo Pires 0a64995b7b Revamped Elasticsearch example that now uses an Alpine Linux container with JRE 8u51 and Elasticsearch 1.7.1. 
Replaced Go discovery mechanism for Elasticsearch discovery plug-in that supports Kubernetes.
 		2015-09-04 09:39:14 +01:00
..
README.md Revamped Elasticsearch example that now uses an Alpine Linux container with JRE 8u51 and Elasticsearch 1.7.1. 2015-09-04 09:39:14 +01:00
es-client-rc.yaml Revamped Elasticsearch example that now uses an Alpine Linux container with JRE 8u51 and Elasticsearch 1.7.1. 2015-09-04 09:39:14 +01:00
es-data-rc.yaml Revamped Elasticsearch example that now uses an Alpine Linux container with JRE 8u51 and Elasticsearch 1.7.1. 2015-09-04 09:39:14 +01:00
es-discovery-svc.yaml Revamped Elasticsearch example that now uses an Alpine Linux container with JRE 8u51 and Elasticsearch 1.7.1. 2015-09-04 09:39:14 +01:00
es-master-rc.yaml Revamped Elasticsearch example that now uses an Alpine Linux container with JRE 8u51 and Elasticsearch 1.7.1. 2015-09-04 09:39:14 +01:00
es-svc.yaml Revamped Elasticsearch example that now uses an Alpine Linux container with JRE 8u51 and Elasticsearch 1.7.1. 2015-09-04 09:39:14 +01:00
service-account.yaml Revamped Elasticsearch example that now uses an Alpine Linux container with JRE 8u51 and Elasticsearch 1.7.1. 2015-09-04 09:39:14 +01:00

README.md

WARNING WARNING WARNING WARNING WARNING

PLEASE NOTE: This document applies to the HEAD of the source tree

If you are using a released version of Kubernetes, you should refer to the docs that go with that version.

The latest 1.0.x release of this document can be found [here](http://releases.k8s.io/release-1.0/examples/elasticsearch/production_cluster/README.md).

Documentation for other releases can be found at releases.k8s.io.

Elasticsearch for Kubernetes

Kubernetes makes it trivial for anyone to easily build and scale Elasticsearch clusters. Here, you'll find how to do so. Current Elasticsearch version is 1.7.1.

Before we start, one needs to know that Elasticsearch best-practices recommend to separate nodes in three roles:

  • Master nodes - intended for clustering management only, no data, no HTTP API
  • Client nodes - intended for client usage, no data, with HTTP API
  • Data nodes - intended for storing and indexing your data, no HTTP API

This is enforced throughout this document.

WARNING Current pod descriptors use an emptyDir for storing data in each data node container. This is meant to be for the sake of simplicity and should be adapted according to your storage needs.

Docker image

This example uses this pre-built image will not be supported. Feel free to fork to fit your own needs, but mind yourself that you will need to change Kubernetes descriptors accordingly.

Deploy

kubectl create -f examples/elasticsearch/production_cluster/service-account.yaml
kubectl create -f examples/elasticsearch/production_cluster/es-discovery-svc.yaml
kubectl create -f examples/elasticsearch/production_cluster/es-svc.yaml
kubectl create -f examples/elasticsearch/production_cluster/es-master-rc.yaml

Wait until es-master is provisioned, and

kubectl create -f examples/elasticsearch/production_cluster/es-client-rc.yaml

Wait until es-client is provisioned, and

kubectl create -f examples/elasticsearch/production_cluster/es-data-rc.yaml

Wait until es-data is provisioned.

Now, I leave up to you how to validate the cluster, but a first step is to wait for containers to be in RUNNING state and check the Elasticsearch master logs:

$ kubectl get pods
NAME              READY     STATUS    RESTARTS   AGE
es-client-2ep9o   1/1       Running   0          2m
es-data-r9tgv     1/1       Running   0          1m
es-master-vxl6c   1/1       Running   0          6m

$ kubectl logs es-master-vxl6c
log4j:WARN No such property [maxBackupIndex] in org.apache.log4j.DailyRollingFileAppender.
log4j:WARN No such property [maxBackupIndex] in org.apache.log4j.DailyRollingFileAppender.
log4j:WARN No such property [maxBackupIndex] in org.apache.log4j.DailyRollingFileAppender.
[2015-08-21 10:58:51,324][INFO ][node                     ] [Arc] version[1.7.1], pid[8], build[b88f43f/2015-07-29T09:54:16Z]
[2015-08-21 10:58:51,328][INFO ][node                     ] [Arc] initializing ...
[2015-08-21 10:58:51,542][INFO ][plugins                  ] [Arc] loaded [cloud-kubernetes], sites []
[2015-08-21 10:58:51,624][INFO ][env                      ] [Arc] using [1] data paths, mounts [[/data (/dev/sda9)]], net usable_space [14.4gb], net total_space [15.5gb], types [ext4]
[2015-08-21 10:58:57,439][INFO ][node                     ] [Arc] initialized
[2015-08-21 10:58:57,439][INFO ][node                     ] [Arc] starting ...
[2015-08-21 10:58:57,782][INFO ][transport                ] [Arc] bound_address {inet[/0:0:0:0:0:0:0:0:9300]}, publish_address {inet[/10.244.15.2:9300]}
[2015-08-21 10:58:57,847][INFO ][discovery                ] [Arc] myesdb/-x16XFUzTCC8xYqWoeEOYQ
[2015-08-21 10:59:05,167][INFO ][cluster.service          ] [Arc] new_master [Arc][-x16XFUzTCC8xYqWoeEOYQ][es-master-vxl6c][inet[/10.244.15.2:9300]]{data=false, master=true}, reason: zen-disco-join (elected_as_master)
[2015-08-21 10:59:05,202][INFO ][node                     ] [Arc] started
[2015-08-21 10:59:05,238][INFO ][gateway                  ] [Arc] recovered [0] indices into cluster_state
[2015-08-21 11:02:28,797][INFO ][cluster.service          ] [Arc] added {[Gideon][4EfhWSqaTqikbK4tI7bODA][es-data-r9tgv][inet[/10.244.59.4:9300]]{master=false},}, reason: zen-disco-receive(join from node[[Gideon][4EfhWSqaTqikbK4tI7bODA][es-data-r9tgv][inet[/10.244.59.4:9300]]{master=false}])
[2015-08-21 11:03:16,822][INFO ][cluster.service          ] [Arc] added {[Venomm][tFYxwgqGSpOejHLG4umRqg][es-client-2ep9o][inet[/10.244.53.2:9300]]{data=false, master=false},}, reason: zen-disco-receive(join from node[[Venomm][tFYxwgqGSpOejHLG4umRqg][es-client-2ep9o][inet[/10.244.53.2:9300]]{data=false, master=false}])

As you can assert, the cluster is up and running. Easy, wasn't it?

Scale

Scaling each type of node to handle your cluster is as easy as:

kubectl scale --replicas=3 rc es-master
kubectl scale --replicas=2 rc es-client
kubectl scale --replicas=2 rc es-data

Did it work?

$ kubectl get pods
NAME              READY     STATUS    RESTARTS   AGE
es-client-2ep9o   1/1       Running   0          4m
es-client-ye5s1   1/1       Running   0          50s
es-data-8az22     1/1       Running   0          47s
es-data-r9tgv     1/1       Running   0          3m
es-master-57h7k   1/1       Running   0          52s
es-master-kuwse   1/1       Running   0          52s
es-master-vxl6c   1/1       Running   0          8m

Let's take another look of the Elasticsearch master logs:

$ kubectl logs es-master-vxl6c
log4j:WARN No such property [maxBackupIndex] in org.apache.log4j.DailyRollingFileAppender.
log4j:WARN No such property [maxBackupIndex] in org.apache.log4j.DailyRollingFileAppender.
log4j:WARN No such property [maxBackupIndex] in org.apache.log4j.DailyRollingFileAppender.
[2015-08-21 10:58:51,324][INFO ][node                     ] [Arc] version[1.7.1], pid[8], build[b88f43f/2015-07-29T09:54:16Z]
[2015-08-21 10:58:51,328][INFO ][node                     ] [Arc] initializing ...
[2015-08-21 10:58:51,542][INFO ][plugins                  ] [Arc] loaded [cloud-kubernetes], sites []
[2015-08-21 10:58:51,624][INFO ][env                      ] [Arc] using [1] data paths, mounts [[/data (/dev/sda9)]], net usable_space [14.4gb], net total_space [15.5gb], types [ext4]
[2015-08-21 10:58:57,439][INFO ][node                     ] [Arc] initialized
[2015-08-21 10:58:57,439][INFO ][node                     ] [Arc] starting ...
[2015-08-21 10:58:57,782][INFO ][transport                ] [Arc] bound_address {inet[/0:0:0:0:0:0:0:0:9300]}, publish_address {inet[/10.244.15.2:9300]}
[2015-08-21 10:58:57,847][INFO ][discovery                ] [Arc] myesdb/-x16XFUzTCC8xYqWoeEOYQ
[2015-08-21 10:59:05,167][INFO ][cluster.service          ] [Arc] new_master [Arc][-x16XFUzTCC8xYqWoeEOYQ][es-master-vxl6c][inet[/10.244.15.2:9300]]{data=false, master=true}, reason: zen-disco-join (elected_as_master)
[2015-08-21 10:59:05,202][INFO ][node                     ] [Arc] started
[2015-08-21 10:59:05,238][INFO ][gateway                  ] [Arc] recovered [0] indices into cluster_state
[2015-08-21 11:02:28,797][INFO ][cluster.service          ] [Arc] added {[Gideon][4EfhWSqaTqikbK4tI7bODA][es-data-r9tgv][inet[/10.244.59.4:9300]]{master=false},}, reason: zen-disco-receive(join from node[[Gideon][4EfhWSqaTqikbK4tI7bODA][es-data-r9tgv][inet[/10.244.59.4:9300]]{master=false}])
[2015-08-21 11:03:16,822][INFO ][cluster.service          ] [Arc] added {[Venomm][tFYxwgqGSpOejHLG4umRqg][es-client-2ep9o][inet[/10.244.53.2:9300]]{data=false, master=false},}, reason: zen-disco-receive(join from node[[Venomm][tFYxwgqGSpOejHLG4umRqg][es-client-2ep9o][inet[/10.244.53.2:9300]]{data=false, master=false}])
[2015-08-21 11:04:40,781][INFO ][cluster.service          ] [Arc] added {[Erik Josten][QUJlahfLTi-MsxzM6_Da0g][es-master-kuwse][inet[/10.244.59.5:9300]]{data=false, master=true},}, reason: zen-disco-receive(join from node[[Erik Josten][QUJlahfLTi-MsxzM6_Da0g][es-master-kuwse][inet[/10.244.59.5:9300]]{data=false, master=true}])
[2015-08-21 11:04:41,076][INFO ][cluster.service          ] [Arc] added {[Power Princess][V4qnR-6jQOS5ovXQsPgo7g][es-master-57h7k][inet[/10.244.53.3:9300]]{data=false, master=true},}, reason: zen-disco-receive(join from node[[Power Princess][V4qnR-6jQOS5ovXQsPgo7g][es-master-57h7k][inet[/10.244.53.3:9300]]{data=false, master=true}])
[2015-08-21 11:04:53,966][INFO ][cluster.service          ] [Arc] added {[Cagliostro][Wpfx5fkBRiG2qCEWd8laaQ][es-client-ye5s1][inet[/10.244.15.3:9300]]{data=false, master=false},}, reason: zen-disco-receive(join from node[[Cagliostro][Wpfx5fkBRiG2qCEWd8laaQ][es-client-ye5s1][inet[/10.244.15.3:9300]]{data=false, master=false}])
[2015-08-21 11:04:56,803][INFO ][cluster.service          ] [Arc] added {[Thog][vkdEtX3ESfWmhXXf-Wi0_Q][es-data-8az22][inet[/10.244.15.4:9300]]{master=false},}, reason: zen-disco-receive(join from node[[Thog][vkdEtX3ESfWmhXXf-Wi0_Q][es-data-8az22][inet[/10.244.15.4:9300]]{master=false}])

Access the service

Don't forget that services in Kubernetes are only acessible from containers in the cluster. For different behavior you should configure the creation of an external load-balancer. While it's supported within this example service descriptor, its usage is out of scope of this document, for now.

$ kubectl get service elasticsearch
NAME            LABELS                                SELECTOR                              IP(S)          PORT(S)
elasticsearch   component=elasticsearch,role=client   component=elasticsearch,role=client   10.100.134.2   9200/TCP

From any host on your cluster (that's running kube-proxy), run:

curl http://10.100.134.2:9200

You should see something similar to the following:

{
  "status" : 200,
  "name" : "Cagliostro",
  "cluster_name" : "myesdb",
  "version" : {
    "number" : "1.7.1",
    "build_hash" : "b88f43fc40b0bcd7f173a1f9ee2e97816de80b19",
    "build_timestamp" : "2015-07-29T09:54:16Z",
    "build_snapshot" : false,
    "lucene_version" : "4.10.4"
  },
  "tagline" : "You Know, for Search"
}

Or if you want to check cluster information:

curl http://10.100.134.2:9200/_cluster/health?pretty

You should see something similar to the following:

{
  "cluster_name" : "myesdb",
  "status" : "green",
  "timed_out" : false,
  "number_of_nodes" : 7,
  "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
}

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