upgrades

package
Version: v0.0.0-...-2608902 Latest Latest
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Published: Apr 25, 2016 License: AGPL-3.0 Imports: 16 Imported by: 0

Documentation

Overview

The upgrades package provides infrastructure to upgrade previous Juju deployments to the current Juju version. The upgrade is performed on a per node basis, across all of the running Juju machines.

Important exported APIs include:

PerformUpgrade, which is invoked on each node by the machine agent with:
  fromVersion - the Juju version from which the upgrade is occurring
  target      - the type of Juju node being upgraded
  context     - provides API access to Juju controllers

Index

Constants

View Source
const (
	// AllMachines applies to any machine.
	AllMachines = Target("allMachines")

	// HostMachine is a machine on which units are deployed.
	HostMachine = Target("hostMachine")

	// Controller is a machine participating in a Juju controller cluster.
	Controller = Target("controller")

	// DatabaseMaster is a Controller that has the master database, and as such
	// is the only target that should run database schema upgrade steps.
	DatabaseMaster = Target("databaseMaster")
)

Variables

View Source
var MinDiskSpaceMib = uint64(250)

We'll be conservative and require at least 250MiB of disk space for an upgrade.

Functions

func AreUpgradesDefined

func AreUpgradesDefined(from version.Number) bool

AreUpgradesDefined returns true if there are upgrade operations defined between the version supplied and the running software version.

func PerformUpgrade

func PerformUpgrade(from version.Number, targets []Target, context Context) error

PerformUpgrade runs the business logic needed to upgrade the current "from" version to this version of Juju on the "target" type of machine.

func PreUpgradeSteps

func PreUpgradeSteps(st *state.State, agentConf agent.Config, isController, isMaster bool) error

PreUpgradeSteps runs various checks and prepares for performing an upgrade. If any check fails, an error is returned which aborts the upgrade.

Types

type Context

type Context interface {
	// APIState returns an API connection to state.
	//
	// TODO(mjs) - for 2.0, this should return a base.APICaller
	// instead of api.Connection once the 1.x upgrade steps have been
	// removed. Upgrade steps should not be able close the API
	// connection.
	APIState() api.Connection

	// State returns a connection to state. This will be non-nil
	// only in the context of a controller.
	State() *state.State

	// AgentConfig returns the agent config for the machine that is being
	// upgraded.
	AgentConfig() agent.ConfigSetter

	// StateContext returns a new Context suitable for State-based
	// upgrade steps.
	StateContext() Context

	// APIContext returns a new Context suitable for API-based upgrade
	// steps.
	APIContext() Context
}

Context provides the dependencies used when executing upgrade steps.

func NewContext

func NewContext(agentConfig agent.ConfigSetter, api api.Connection, st *state.State) Context

NewContext returns a new upgrade context.

type Operation

type Operation interface {
	// The Juju version for which this operation is applicable.
	// Upgrade operations designed for versions of Juju earlier
	// than we are upgrading from are not run since such steps would
	// already have been used to get to the version we are running now.
	TargetVersion() version.Number

	// Steps to perform during an upgrade.
	Steps() []Step
}

Operation defines what steps to perform to upgrade to a target version.

type Step

type Step interface {
	// Description is a human readable description of what the upgrade step does.
	Description() string

	// Targets returns the target machine types for which the upgrade step is applicable.
	Targets() []Target

	// Run executes the upgrade business logic.
	Run(Context) error
}

Step defines an idempotent operation that is run to perform a specific upgrade step.

type Target

type Target string

Target defines the type of machine for which a particular upgrade step can be run.

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