Couchbase Server

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NOTE: This role is experimental and not intended for production use. Feel free to use the role for evaluation, development, or testing, and borrow the ideas contained within for your own production role or playbooks. As with other Couchbase Labs projects, this is primarily for experimentation.

Couchbase Server is a high performance NoSQL document database available in Community and Enterprise editions supported for common operating systems.

you can use this Ansible role to install Couchbase Server on cluster nodes, initialize working clusters, create buckets, and load buckets with test documents with the playbooks included in the examples directory.

3-Node Development Cluster Quick Start with Vagrant

Follow these steps to deploy a CentOS based, simple 3 node development or evaluation cluster on a physical host with >= 8GB RAM, using VirtualBox and Vagrant.

If You Have Previously Used Ansible Galaxy

1. ansible-galaxy install couchbaselabs.couchbase-server
2. cd <roles_path>/examples
3. ./bin/preinstall.sh
4. vagrant up

If You Have Not Previously Used Ansible Galaxy

1. mkdir $HOME/ansible_roles
2. echo -e "[defaults]\n\nroles_path = $HOME/ansible_roles" > $HOME/.ansible.cfg
3. ansible-galaxy install couchbaselabs.couchbase-server
4. cd $HOME/ansible_roles/couchbaselabs.couchbase-server/examples
5. ./bin/preinstall.sh
6. vagrant up

Note that $ANSIBLE_ROLES_PATH defaults to /etc/ansible/roles or the path you've specified in ~/.ansible.cfg for roles_path.

This will install three (3) CentOS 6.5 nodes with 2GB RAM each and cluster them together. The nodes will be available at 10.1.42.10, 10.1.42.20, and 10.1.42.30 as defined in the Vagrantfile.

To install Debian based nodes, change the command in step 4 to:

BOX_NAME=chef/debian-7.4 vagrant up

To install Ubuntu based nodes, change the command in step 4 to:

BOX_NAME=ubuntu/trusty64 vagrant up

See examples/README_VAGRANT.md for more Vagrant cluster based details.

Requirements

This role functions with the following software:

• Couchbase Server (versions 3.0.1-4.1.0)
• Ansible (version 1.9.4)
• CentOS (versions 6-7)
• Debian (version 7)
• Ubuntu (versions 12.04-14.04)

This role does not function with the following software:

• CentOS 7.2 — Bug in CentOS prevents operation of Couchbase Server service

Works with Ansible Galaxy

You can install this role with the ansible-galaxy command, and can run it directly from the git repository.

You should install it like this:

ansible-galaxy install couchbaselabs.couchbase-server

Make sure you have write access to /etc/ansible/roles/ since that is the default Ansible role installation path, or define your own Ansible role path by creating a $HOME/.ansible.cfg file with these contents:

[defaults]
roles_path = <path_to_your_preferred_role_location>

Change <path_to_your_preferred_role_location> to a directory you have write access to.

See the ansible-galaxy documentation for more details.

Role Variables

In cases where you want simple clusters for development or other non-production use, the values for Couchbase Server role's default variables are good as-is.

Should you need specific performance or otherwise wish to tweak them for your particular purpose, this section describes all the role variables for your reference in detail, including their default values.

Default Variables

Variable Notes

• Other Couchbase Server versions: You can comment out the topmost / current version in the defaults/*.yml file for your OS and uncomment a previous version to have that version installed by default instead. This is also possible with specific arguments in the Vagrantfile as well.
• couchbase_server_local_package: Place the Couchbase Server package you wish to install into the files directory and set this to true to skip package download. This can greatly speed up the playbook for large clusters and is useful for cluster nodes without necessary access to directlyy download the package.

Special Variables

Configure the following variables with caution as they have potential negative performance implications; you should not use them without knowledge of the changes they make to the operating system configuration:

Multi Dimensional Scaling and New Service Types

This examples/cluster_init.yml playbook now has basic support for Couchbase Server version 4.x and its new service types. Specifically, you can now tag a cluster node as providing the following services:

• data : the standard document data service
• index : the global secondary index (GSI) service
• query : the N1QL query service

To specify which services a node should be responsible for, add them to the couchbase_server_node_services variable as part of your cluster node host inventory definition.

Reference the cluster_nodes_mds section of examples/example_hosts for an example of service specification.

See Services architecture and multidimensional scaling for more information about service types.

Examples

The examples directory contains some basic playbooks, host inventory examples, and Vagrant bits (primarily for development use) as follows:

• cluster_backup.yml full backup of cluster and retrieval of backup tarball
• cluster_collect_info.yml gathers cluster logs with cbcollect_info
• cluster_init.yml installs Couchbase Server and initializes the cluster
• cluster_install.yml prepares OS and installs Couchbase Server
• create_bucket.yml creates an example bucket
• load_bucket.yml loads sample JSON data into a bucket
• node_failover.yml manual failover of cluster node
• retreive_ssl_cert.yml retrieve and store node's SSL certificate
• site.yml basic role inclusion example
• example_hosts example hosts inventory in format required by this project
• Vagrantfile example Vagrant development cluster definition
• vagrant_hosts default Vagrant hosts inventory file
• vagrant_hosts_mds example Vagrant hosts inventory file with MDS

Create Buckets

The example playbook create_bucket.yml for bucket creation works as follows:

Upon first execution without specifying variable arguments via the ansible-playbook extra vars ('-e') option, the playbook will generate a bucket with the following properties:

• Bucket name: default
• Bucket type: couchbase
• Bucket port: 11211
• Bucket RAM size: 256MB
• Bucket replica number: 1

If you'd like to create your own buckets, then use the ansible-playbook extra vars ('-e') option and specify values for the couchbase_server_bucket_name, couchbase_server_bucket_type, couchbase_server_bucket_port, couchbase_server_bucket_ram, and couchbase_server_bucket_replica variables like so:

ansible-playbook -i vagrant_hosts create_bucket.yml \
-e "couchbase_server_bucket_name=danika couchbase_server_bucket_type=couchbase couchbase_server_bucket_port=11223 couchbase_server_bucket_ram=256 couchbase_server_bucket_replica=2"

or perhaps you'd like to make a memcached based bucket? No problem:

ansible-playbook -i vagrant_hosts create_bucket.yml \
-e "b_name=breandon couchbase_server_bucket_type=memcached couchbase_server_bucket_port=11224 couchbase_server_bucket_ram=512 couchbase_server_bucket_replica=0"

Dependencies

None

License

Apache

Author Information

• Brian Shumate (brian at couchbase.com)

Contributors

Thanks to these people who have contributed to the role:

• ahamidi
• cricket007
• Jonnymcc
• Hughjmp
• SomeoneWeird
• zabullet
• gsempe