nodeup

README

NodeUp Tasks

Within a model, we recognize a few well-known task names:

• files
• packages
• services
• options

When a directory is found with one of these well-known names, the items in the subtree build tasks of the corresponding types.

(TODO: Should we just prefer extensions everywhere?)

Directories which start with an underscore are tags: we only descend into those directories if the relevant tag is present.

All other directory names can be used for organization.

Alongside each task file, a file with the same name with a .meta extension will be recognized as well. It contains additional JSON options to parameterize the task. This is useful for files or templates, which otherwise have no place to put metadata.

files

The contents of the filesystem tree will be created, mirroring what exists under the files directory.

Directories will be created as needed. Created directories will be set to mode 0755.

Files will be created 0644 (change with meta 'fileMode')

Owner & group will be root:root

Two special extensions are recognized:

• .asset will be sourced from assets. Assets are binaries that are made available to the installer, e.g. from a .tar.gz distributino
• .template is a go template

packages

Any files found will be considered packages.

The name of the file will be the package to be installed.

services

Any files found will be considered services.

The name of the file will be the service to be managed.

By default, the service will be restarted and set to auto-start on boot.

Order of operations

Logically, all operations are collected before any are performed, according to the tags.

Then operations are performed in the following order:

options packages files sysctls services

Ties are broken as follows

• A task that required more tags is run after a task that required fewer tags
• Sorted by name
• Custom packages (install a deb) are run after OS provided packages

Documentation

Index

• Constants
• func FindOSTags(rootfs string) ([]string, error)
• type Image
• type Loader
  • func NewLoader(config *NodeUpConfig, cluster *api.Cluster, assets *fi.AssetStore, ...) *Loader
  • func (l *Loader) Build(baseDir vfs.Path) (map[string]fi.Task, error)
• type NodeUpCommand
  • func (c *NodeUpCommand) Run(out io.Writer) error
• type NodeUpConfig
• type TaskBuilder

Constants

const DefaultProtokubeImage = "kope/protokube:1.3"

const MaxAttemptsWithNoProgress = 100

We should probably retry for a long time - there is not really any great fallback

const TagMaster = "_kubernetes_master"

Functions

func FindOSTags

func FindOSTags(rootfs string) ([]string, error)

FindOSTags infers tags from the current distro We will likely remove this when everything is containerized

Types

type Image

type Image struct {
	// Source is the URL from which we should download the image
	Source string `json:"source,omitempty"`

	// Hash is the hash of the file, to verify image integrity (even over http)
	Hash string `json:"hash,omitempty"`
}

Image is a docker image we should pre-load

type Loader

type Loader struct {
	TemplateFunctions template.FuncMap
	// contains filtered or unexported fields
}

func NewLoader

func NewLoader(config *NodeUpConfig, cluster *api.Cluster, assets *fi.AssetStore, tags map[string]struct{}) *Loader

func (*Loader) Build

func (l *Loader) Build(baseDir vfs.Path) (map[string]fi.Task, error)

type NodeUpCommand

type NodeUpCommand struct {
	ConfigLocation string
	ModelDir       vfs.Path
	CacheDir       string
	Target         string
	FSRoot         string
	// contains filtered or unexported fields
}

func (*NodeUpCommand) Run

func (c *NodeUpCommand) Run(out io.Writer) error

type NodeUpConfig

type NodeUpConfig struct {
	// Tags enable/disable chunks of the model
	Tags []string `json:",omitempty"`
	// Assets are locations where we can find files to be installed
	// TODO: Remove once everything is in containers?
	Assets []string `json:",omitempty"`

	// Images are a list of images we should preload
	Images []*Image `json:"images,omitempty"`

	// ClusterLocation is the VFS path to the cluster spec
	ClusterLocation string `json:",omitempty"`

	// ClusterName is the name of the cluster
	// Technically this is redundant - it is in ClusterLocation, but this can serve as a cross-check,
	// and it allows us to more easily identify the cluster, for example when we are deleting resources.
	ClusterName string `json:",omitempty"`

	// ProtokubeImage is the docker image to load for protokube (bootstrapping)
	ProtokubeImage *Image `json:"protokubeImage"`
}

type TaskBuilder

type TaskBuilder func(name string, contents string, meta string) (fi.Task, error)