Ganeti Puppet support

Description

The ganeti module installs and configures packages to configure a Ganeti cluster.

Setup

This module does not initialize a cluster or add nodes, which are expected to be pre-installed in the cluster. However, it will properly prepare nodes with the right software to do so. So normally, you should only have to run gnt-cluster init on the master and gnt-node add for each secondary node.

Requires the camptocamp/kmod module in order to load the right kernel modules when the module is configured with_drbd.

Usage

The main ganeti class handles most of the work:

include ganeti

It sets up ganeti packages and also deploys a few set of custom hooks to make gnt-instance-debootstrap work properly. Extra hooks can be deployed manually in /etc/ganeti/instance-debootstrap/hooks/ as needed. The debootstrap configuration can be modified through the bootstrap_defaults parameter. This, for example, will add extra pacakges to every install:

  class { ganeti :
    debootstrap_defaults => {
      extra_packages => ['linux-image-amd64', 'dbus', 'libpam-systemd'],
    }
  }

Creating a swap partition at instance creation

If you are using ganeti-instance-debootstrap to provision the base install for your instances, this module provides a hook that will help you setup a disk as a swap partition upon instance creation.

To achieve this, you need to label (name) one of the disk as "swap", as in the following example:

gnt-instance add -d -o debootstrap+buster -t plain \
 --disk 0:size=14G --disk 1:size=1G,name=swap
 instance1.example.com

Here, we have one disk of 1Gb that's named "swap": this will be used as swap space automatically. The other disk will be used as the main disk to install the system on.

Reference

See [REFERENCE.md][].

Limitations

Tested on Debian stretch and buster, compatibility with other versions and distributions unknown.

Development

Developed and maintained by the shared puppet modules group.

Reference

Table of Contents

Classes

Public Classes

• ganeti: Configure a drbd node server
• ganeti::nagios_checks: Deploy optional nagios check scripts for ganeti

Private Classes

• ganeti::config: Setup files and other resources for a ganeti node
• ganeti::package: Install packages required for a ganeti node
• ganeti::service: Make sure that the ganeti services are running.

Classes

ganeti

Configure a drbd node server

Parameters

The following parameters are available in the ganeti class.

with_drbd

Data type: Boolean

Set this to false to disable installing drbd on the node.

Default value: true

security_model

Data type: Optional[Enum['pool']]

If set to 'pool', will create a number of non-privileged users that ganeti will use to run instances with. This is mostly useful when using the kvm backend.

Default value: 'pool'

pool_uid_base

Data type: Integer

When security_model is set to 'pool', users that get created will start with this uid and all additional ones will have uids incremented from this number.

Default value: 4000

pool_num_users

Data type: Integer

When security_model is set to 'pool', number of users with sequential uids that will get created for the pool.

Default value: 20

pool_username_prefix

Data type: String[1]

When security_model is set to 'pool', users that get created will have a username that starts with this string. Names will then be completed with the increment on the uid_base, starting at 0, appended to the prefix.

Default value: 'ganeti'

private_ip

Data type: Optional[Stdlib::IP::Address]

IP address configured on the node that is not facing a public network. It is strongly recommended to configure nodes to have a second interface that is part of a network that's not reachable through a public network. This makes it possible to hide away ganeti commands, drbd replication traffic and other sensitive information. This module will also configure ganeti services to listen only to the private IP, if provided. See this post for more information on how that can be configured: https://groups.google.com/forum/#!searchin/ganeti/secondary$20ip|sort:date/ganeti/XBRWU7LwA6g/QnxpAo5HAQAJ

Default value: undef

purge_instance_debootstrap

Data type: Boolean

By default, this module removes all unknown configuration in the ganeti-instance-debootstrap package creation template so that instances created are using a known configuration. Set this value to false in order to disable purging of the hooks directory.

Default value: true

debootstrap_defaults

Data type: Ganeti::Debootstrap_config

Set of configuration options that define the default behaviour for instances created with ganeti-instance-debootstrap. The values in this hash correspond to values in /etc/default/ganeti-instance-debootstrap. Refer to types/debootstrap_config.pp to see all of the available options and their expected data types.

• proxy: if set, configure apt to use a proxy when downloading packages
• mirror: URL of the debian apt source used to retrieve packages
• arch: if set, will install instances with a different architecture than the host
• suite: if set, define the default suite used by debootstrap
• extra_packages: list of packages to have debootstrap install on top of the requested suite
• components: if set, define the suite components used by debootstrap (e.g. "main,contrib,non-free")
• customize_dir: absolute path to a directory containing hooks run after debootstrap is done
• generate_cache: set to 'no' to disable package cache for debootstrap
• clean_cache: number of days during which packages are kept in cache
• partition_style: set to 'none' to avoid creating a partition table on devices joined to an instance
• partition_alignment: alignment of the partitions in sectors

Default value: {}

debootstrap_variants

Data type: Hash[String, Ganeti::Variant]

Hash of definitions for debootstrapt variants that are defined on the cluster. Each value should be a struct with any of the required values set (see the type alias Ganeti::Variant for a complete list of available values). An empty list will create an empty configuration file, which means that all default values will be used.

debootstrap_puppet_hook

Data type: Boolean

Set this to true to install puppet inside instances when they are installed with instance-debootstrap. Make sure to also set debootstrap_puppet_server.

Default value: false

debootstrap_puppet_server

Data type: Optional[Stdlib::Host]

Hostname or IP address of the puppet server to which the instances should connect to. This value is only used when debootstrap_puppet_hook is set to true.

Default value: undef

debootstrap_locale

Data type: Optional[String[1]]

Name of the default locale that will be configured in the new instances when they get created by the debootstrap template. If set to undef (default), locale will be untouched and no hook script for setting the locale will be installed. This should be something legal in the locales package, for example en_US or en_US.UTF-8, as (currently) defined in /var/lib/dpkg/info/locales.config.

Default value: undef

debootstrap_charmap

Data type: String[1]

Name of the character map (should correspond to the name of a file in /usr/share/i18n/charmaps) used by the default locale configured in new instances. This value is unused if debootstrap_locale is set to undef.

Default value: 'UTF-8'

ganeti::nagios_checks

If you include this class, make sure to order it after install of nagios-plugins-basic. Otherwise, the plugin directory will not exist.