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Google Compute Engine Cloud Plugin for ElasticSearch

The GCE Cloud plugin allows to use GCE API for the unicast discovery mechanism.

In order to install the plugin, simply run: bin/plugin -install elasticsearch/elasticsearch-cloud-gce/1.0.0-SNAPSHOT.

----------------------------------------------
|     GCE Cloud Plugin    | ElasticSearch    |
----------------------------------------------
| 1.0.0-SNAPSHOT (master) | 0.90 -> master   |
----------------------------------------------

Google Compute Engine Virtual Machine Discovery

Google Compute Engine VM discovery allows to use the google APIs to perform automatic discovery (similar to multicast in non hostile multicast environments). Here is a simple sample configuration:

  cloud:
      gce:
          project_id: <your-google-project-id>
          zone: <your-zone>
  discovery:
          type: gce

How to start (short story)

  • Create Google Compute Engine instance
  • Install Elasticsearch
  • Install Google Compute Engine Cloud plugin
  • Modify elasticsearch.yml file
  • Start Elasticsearch

How to start (long story)

Prerequisites

Before starting, you should have:

  • GCUtil
  • Your Google service account name. Generally, the account name has the format 123845678986@project.gserviceaccount.com. You can get it from Google APIS Console
  • Your project ID. Let's say here es-cloud. Get it from Google APIS Console.

Creating your first instance

gcutil --project=es-cloud addinstance myesnode1 --service_account_scope=compute-rw --persistent_boot_disk

You will be asked to open a link in your browser. Login and allow access to listed services. You will get back a verification code. Copy and paste it in your terminal.

You should get Authentication successful. message.

Then, choose your zone. Let's say here that we choose europe-west1-a.

Choose your compute instance size. Let's say f1-micro.

Choose your OS. Let's say projects/debian-cloud/global/images/debian-7-wheezy-v20130617.

You may be asked to create a ssh key. Follow instructions to create one.

When done, a report like this one should appears:

Table of resources:

+-----------+--------------+-------+---------+--------------+----------------+----------------+----------------+---------+----------------+
|   name    | machine-type | image | network |  network-ip  |  external-ip   |     disks      |      zone      | status  | status-message |
+-----------+--------------+-------+---------+--------------+----------------+----------------+----------------+---------+----------------+
| myesnode1 | f1-micro     |       | default | 10.240.20.57 | 192.158.29.199 | boot-myesnode1 | europe-west1-a | RUNNING |                |
+-----------+--------------+-------+---------+--------------+----------------+----------------+----------------+---------+----------------+

Note your external ip address.

Now, your first instance is started. You need to install Elasticsearch on it. You can now connect to your machine:

ssh -i ~/.ssh/google_compute_engine 192.158.29.199

Once connected, install Elasticsearch:

sudo apt-get update

# Install curl if needed
sudo apt-get install curl

# Download Elasticsearch
curl https://download.elasticsearch.org/elasticsearch/elasticsearch/elasticsearch-0.90.2.deb -o elasticsearch-0.90.2.deb

# Prepare Java installation
sudo apt-get install java7-runtime-headless

# Prepare Elasticsearch installation
sudo dpkg -i elasticsearch-0.90.2.deb

Check that elasticsearch is running:

curl http://localhost:9200/

This command should give you a JSON result:

{
  "ok" : true,
  "status" : 200,
  "name" : "Lunatica",
  "version" : {
    "number" : "0.90.2",
    "snapshot_build" : false
  },
  "tagline" : "You Know, for Search"
}

Install elasticsearch cloud gce plugin

Stop elasticsearch:

sudo service elasticsearch stop

Install the plugin:

sudo /usr/share/elasticsearch/bin/plugin -install elasticsearch/elasticsearch-cloud-gce/1.0.0-SNAPSHOT

Configure it:

sudo vi /etc/elasticsearch/elasticsearch.yml

And add the following lines:

  cloud:
      gce:
          project_id: es-cloud
          zone: europe-west1-a
  discovery:
          type: gce

Restart elasticsearch:

sudo service elasticsearch start

Cloning your existing machine

First create an image of your running instance:

sudo python /usr/share/imagebundle/image_bundle.py \
  -r / -o /tmp/ --log_file=/tmp/abc.log

An image has been created in /tmp directory:

$ ls /tmp
e4686d7f5bf904a924ae0cfeb58d0827c6d5b966.image.tar.gz

Upload your image to Google Cloud Storage:

# Launch this command and follow instructions to give your instance an access to your storage
gsutil config

Create a bucket to hold your image, let's say esimage:

gsutil mb gs://esimage

Copy your image to this bucket:

gsutil cp /tmp/e4686d7f5bf904a924ae0cfeb58d0827c6d5b966.image.tar.gz gs://esimage

Add your image to images collection:

First, exit from your SSH session: exit.

Then, run locally:

gcutil listkernels --project es-cloud
+----------------------------------------------+--------------------------------------------------+-------------+
|                     name                     |                   description                    | deprecation |
+----------------------------------------------+--------------------------------------------------+-------------+
| projects/google/global/kernels/gce-20120621  | 2.6.39-gcg built 2012-03-29 01:07:00             | DEPRECATED  |
| projects/google/global/kernels/gce-v20130603 | SCSI-enabled 3.3.8-gcg built 2013-05-29 01:04:00 |             |
+----------------------------------------------+--------------------------------------------------+-------------+
# Note the kernel you prefer to use
gcutil --project=es-cloud addimage elasticsearch-0-90-2 \
       gs://esimage/e4686d7f5bf904a924ae0cfeb58d0827c6d5b966.image.tar.gz \
       --preferred_kernel=projects/google/global/kernels/gce-v20130603

Create as many instance as you need:

gcutil --project=es-cloud addinstance --image=elasticsearch-0-90-2 \
       --kernel=projects/google/global/kernels/gce-v20130603 myesnode2 \
       --zone europe-west1-a --machine_type f1-micro --service_account_scope=compute-rw \
       --persistent_boot_disk

Remove a node

You can use Google Cloud Console or CLI to manage your instances:

# Stopping and removing instances
gcutil --project=es-cloud deleteinstance myesnode1 myesnode2 --zone=europe-west1-a

# Consider removing disk as well if you don't need them anymore
gcutil --project=es-cloud deletedisk boot-myesnode1 boot-myesnode2 --zone=europe-west1-a

Filtering by tags

The GCE discovery can also filter machines to include in the cluster based on tags using discovery.gce.tags settings. For example, setting discovery.gce.tags to dev will only filter instances having a tag set to dev. Several tags set will require all of those tags to be set for the instance to be included.

One practical use for tag filtering is when an GCE cluster contains many nodes that are not running elasticsearch. In this case (particularly with high ping_timeout values) there is a risk that a new node's discovery phase will end before it has found the cluster (which will result in it declaring itself master of a new cluster with the same name - highly undesirable). Adding tag on elasticsearch GCE nodes and then filtering by that tag will resolve this issue.

Add your tag when building the new instance:

gcutil --project=es-cloud addinstance myesnode1 --service_account_scope=compute-rw --persistent_boot_disk \
       --tags=elasticsearch,dev

Then, define it in elasticsearch.yml:

  cloud:
      gce:
          project_id: es-cloud
          zone: europe-west1-a
  discovery:
          type: gce
          gce:
                tags: elasticsearch, dev

Tips

If you don't want to repeat the project id each time, you can save it in ~/.gcutil.flags file using:

gcutil getproject --project=es-cloud --cache_flag_values

~/.gcutil.flags file now contains:

--project=es-cloud

License

This software is licensed under the Apache 2 license, quoted below.

Copyright 2009-2013 ElasticSearch <http://www.elasticsearch.org>

Licensed under the Apache License, Version 2.0 (the "License"); you may not
use this file except in compliance with the License. You may obtain a copy of
the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
License for the specific language governing permissions and limitations under
the License.