Couchbase provides high availability and disaster recovery in several ways:
- Homogenous cluster
- Replication
- Intra-cluster replication
- Cross-data center replication (XDCR)
- Backup and restore
- Rack zone awareness
This blog will show how to create a Couchbase cluster using Couchbase Command Line Interface (CLI). In addition, these steps can also be performed using the Couchbase REST API and the Couchbase Web Console.
Couchbase nodes in a cluster are homogeneous. Applications can write to any node and read from any node. There is no write-to-master and read-from-slave architecture that inherently gives you scalability problems. This allows the Couchbase cluster to truly scale horizontally to meet your growing application demands.
Creating a Couchbase cluster involves the following steps:
- Provision Couchbase: Provision 1 or more Couchbase nodes, say on Amazon Web Services
- Initialize master: Initialize any node to be the “master” of the cluster by calling
cluster-initCLI command - Create cluster: For all other nodes, create a cluster by invoking the
server-addCLI command - Rebalance cluster: Finally, rebalance the cluster by calling the
rebalanceCLI command
Provision Couchbase
Provision a Couchbase node on Amazon:
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aws ec2 run-instances \
--image-id ami-db95ffbb \
--count 1 \
--instance-type m3.large \
--key-name my-couchbase-key \
--security-groups "Couchbase Server Community Edition-4-0-0-AutogenByAWSMP-"
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Let’s call this node as “master”.
Initialize Couchbase “master”
Configure the “master” instance and initialize the cluster:
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export COUCHBASE_CLI=/Users/arungupta/tools/Couchbase-Server-4.0.app/Contents/Resources/couchbase-core/bin/couchbase-cli
$COUCHBASE_CLI \
cluster-init \
-c <master-ip>:8091 \
-u Administrator \
-p password \
--cluster-username Administrator \
--cluster-password password \
--cluster-index-ramsize=300 \
--cluster-ramsize=300 \
--services=data,index,query
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Create another instance, lets call it “worker”. Note, this is not a master/slave architecture. Couchbase cluster is homogenous where any node in the cluster can be “master”.
Create Couchbase Cluster
Add this newly created “worker” instance to the cluster:
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$COUCHBASE_CLI \
server-add \
--cluster=<master-ip>:8091 \
--user Administrator \
--password password \
--server-add=<worker-ip> \
--server-add-username=Administrator \
--server-add-password=password
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Typically, you’ll create and add multiple nodes to the cluster before rebalancing.
Rebalance Couchbase Cluster
Rebalance the cluster:
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$COUCHBASE_CLI \
rebalance \
--cluster=<master-ip>:8091 \
--user Administrator \
--password password
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Now, you can create as many instances and easy include them in the cluster.
Adding a single node and rebalancing the cluster can be easily done as a single step:
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$COUCHBASE_CLI \
rebalance \
--cluster=<master-ip>:8091 \
--user Administrator \
--password password
--server-add=<worker-ip>
--server-add-username=Administrator
--server-add-password=password
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Now, your cluster is accessible at http://<master-ip>:8091 or http://<worker-ip>:8091.
Further references …
- Couchbase Server Developer Portal
- Hello Couchbase Example
- Couchbase CLI
- Questions on StackOverflow, Forums or Slack Channel
- Follow us @couchbasedev
- Couchbase 4.5 Beta
Enjoy!
Source: http://blog.couchbase.com/2016/scaling-rebalancing-couchbase-cluster-cli
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