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vcluster

Go Reference

This repository contains the vcluster-ops Go library and command-line interface to administer a Vertica cluster with a REST API. The REST API endpoints are exposed by the following services:

  • Node Management Agent (NMA)
  • Embedded HTTPS service

This CLI tool combines REST calls to provide a coherent Go interface so that you can perform the following administrator operations:

  • Create a database
  • Scale a cluster up and down
  • Restart a cluster
  • Stop a cluster
  • Revive an Eon database

Historically, these operations were performed with admintools. However, admintools is not suitable for containerized environments because it relies on SSH for communications and maintains a state file (admintools.conf) on each Vertica host.

The VerticaDB operator uses this library to perform database actions on Vertica on Kubernetes.

Prerequisites

Repository contents overview

vcluster/
├── commands
├── main.go
└── vclusterops
    ├── test_data
    ├── util
    ├── vlog
    └── vstruct
  • /vcluster directory contains minimal code that sets up and invokes the entry point (main.go) for the vcluster CLI.
  • /commands: Code for parsing command line options. These options are translated into arguments for the high-level functions in /vclusterops.
  • /vclusterops: Library code for high-level operations such as CreateDB, StopDB, and StartDB. It also contains all code for executing the steps that complete these functions. Code in this library should not depend on other directories in this project. External projects import this library to build custom CLI tools.
  • /vclusterops/test_data: Contains code and files for testing purposes. By convention, the go tool ignores the /test_data directory. This directory contains a YAML file that defines a simple three-node Eon Mode cluster for testing.
  • /vclusterops/util: Code that is used by more than one library in this project and does not fit logically into an existing package.
  • /vclusterops/vlog: Sets up a logging utility that writes to /opt/vertica/log/vcluster.log.
  • /vclusterops/vstruct: Contains helper structs used by vcluster-ops.

Usage

Each source file in vclusterops/ contains a V<Operation>Options struct with option fields that you can set for that operation, and a V<Operation>OptionsFactory factory function that returns a struct with sensible option defaults. General database and authentication options are available in DatabaseOptions in vclusterops/vcluster_database_options.go.

The following example imports the vclusterops library, and then calls functions from vclusterops/create_db.go to create a database:

import "github.com/vertica/vcluster/vclusterops"

// get default create_db options
opts := vclusterops.VCreateDatabaseOptionsFactory()

// set database options
opts.RawHosts = []string{"host1_ip", "host2_ip", "host3_ip"}
opts.DBName = "my_database"
*opts.ForceRemovalAtCreation = true
opts.CatalogPrefix = "/data"
opts.DataPrefix = "/data"

// set authentication options
opts.Key = "your_tls_key"
opts.Cert = "your_tls_cert"
opts.CaCert = "your_ca_cert"
*opts.UserName = "database_username"
opts.Password = "database_password"

// pass opts to VCreateDatabase function
vdb, err := vclusterops.VCreateDatabase(&opts)
if err != nil {
	// handle the error here
}

We can use similar way to set up and call other vcluster-ops commands.

Licensing

vcluster is open source code and is under the Apache 2.0 license. Please see LICENSE for details.