node-provhost

A node library for generating and parsing tags from a hostname string.

Why?

Some VPS hosts have no way of tagging instances with metadata, so we need a way of easily determining what server does what using a common field - the hostname.

Syntax

namespace--groups-that3-are-seperated--someid

Numbers suffixed to a group name determine how many instances of that group are expected to run on this host. I.e. www4 would set the count of the www group to 4.

Usage

var provhost = require('provhost');

console.log(provhost.stringify({
    namespace: 'myapp',
    groups: [
        'mysql',
        { name: 'www', count: 4 },
        'redis',
        'mongo2' // Same as `{ name: 'mongo', count: 2 }`
    ]
}));

console.log(provhost.parse(
    // Result of the above console.log
    'myapp--mongo2-mysql-redis-www4--4cb93e77'
));

// Returns:
{
    "namespace": "myapp",
    "groups": [
        {
            "name": "mongo",
            "count": 2
        },
        {
            "name": "mysql",
            "count": 1
        },
        {
            "name": "redis",
            "count": 1
        },
        {
            "name": "www",
            "count": 4
        }
    ],
    "id": "4cb93e77"
};