clusterd

package
v0.1.1 Latest Latest
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 Go to latest Published: Dec 5, 2016 License: Apache-2.0 Imports: 17 Imported by: 0

Documentation

Overview

Copyright 2016 The Rook Authors. All rights reserved.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at 

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Copyright 2016 The Rook Authors. All rights reserved.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at 

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Copyright 2016 The Rook Authors. All rights reserved.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at 

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Copyright 2016 The Rook Authors. All rights reserved.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at 

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Copyright 2016 The Rook Authors. All rights reserved.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at 

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Copyright 2016 The Rook Authors. All rights reserved.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at 

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Copyright 2016 The Rook Authors. All rights reserved.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at 

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Copyright 2016 The Rook Authors. All rights reserved.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at 

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Copyright 2016 The Rook Authors. All rights reserved.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at 

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Copyright 2016 The Rook Authors. All rights reserved.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at 

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Copyright 2016 The Rook Authors. All rights reserved.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at 

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Index

Constants

View Source 
const (
	EtcdRequestTimeout = time.Second
	LeaderKey          = "/rook/leader"
)
View Source 
const (
	DesiredKey              = "desired"
	AppliedKey              = "applied"
	NodeStatusRootKey       = "/rook/_notify/%s"
	NodeStatusServiceKey    = "/rook/_notify/%s/%s" // node ID, service name
	InfiniteTimeout         = -1
	StatusValue             = "status"
	NodeConfigStatusUnknown = iota
	NodeConfigStatusNotTriggered
	NodeConfigStatusTriggered
	NodeConfigStatusRunning
	NodeConfigStatusFailed
	NodeConfigStatusSucceeded
	NodeConfigStatusTimeout
	NodeConfigStatusAbort
)
View Source 
const (
	LeaderElectionKey = "orchestrator-leader"
)
View Source 
const (
	SystemLogDir = "/var/log/rook"
)

Variables

This section is empty.

Functions

func ConfigureServiceIfTriggered 

func ConfigureServiceIfTriggered(context *Context, agent ServiceAgent) bool

func GetNodeProgressKey 

func GetNodeProgressKey(nodeID string) string

Get the general node status key, used for communication between the leader and the agents

func GetNodeStatusKey 

func GetNodeStatusKey(service, nodeID string) string

Get the status key for the general node or the specific service on the node.

func IsLeader 

func IsLeader(l Lease, nodeID string) bool

func IsNodeUnhealthy 

func IsNodeUnhealthy(node *inventory.NodeConfig) (int, bool)

func RunConfigureAgent 

func RunConfigureAgent(context *Context, agent ServiceAgent) error

func SetNodeConfigStatus 

func SetNodeConfigStatus(etcdClient etcd.KeysAPI, nodeID, taskKey string, nodeStatus NodeConfigStatus) error

SetNodeConfigStatus sets the node configuration status. If a taskKey is specified, set the status for a specific task. If the taskKey is the empty string, set the status for the node.

func SetNodeConfigStatusWithPrevIndex 

func SetNodeConfigStatusWithPrevIndex(etcdClient etcd.KeysAPI, nodeID string, nodeStatus NodeConfigStatus,
	prevIndex uint64) (*etcd.Response, error)

func TriggerAgents 

func TriggerAgents(etcdClient etcd.KeysAPI, nodeIDs []string, agentKey string) error

Trigger agents that they need to apply new state. The method will not wait for any nodes to respond. Returns success if the etcd trigger keys were set.

func TriggerAgentsAndWait 

func TriggerAgentsAndWait(etcdClient etcd.KeysAPI, nodeIDs []string, agentKey string, requiredSuccessCount, waitSeconds int) error

Trigger agents that they need to apply new state. The method will wait for all nodes to respond. Returns success if at least "requiredSuccessCount" of the nodes succeed. Waits at most the designated number of seconds.

func TriggerAgentsAndWaitForCompletion 

func TriggerAgentsAndWaitForCompletion(etcdClient etcd.KeysAPI, nodeIDs []string, agentKey string, requiredSuccessCount int) error

Trigger agents that they need to apply new state. The method will wait for all nodes to respond. Returns success if at least "requiredSuccessCount" of the nodes succeed. Waits at most 60s per node.

func WaitForNodeConfigCompletion 

func WaitForNodeConfigCompletion(etcdClient etcd.KeysAPI, taskKey string, nodes []string, timeout int) (int, error)

Types

type ClusterMember 

type ClusterMember struct {
	// contains filtered or unexported fields
}

func (*ClusterMember) ElectLeader 

func (r *ClusterMember) ElectLeader() error

type ClusterRefresher 

type ClusterRefresher struct {
	// contains filtered or unexported fields
}

ClusterRefresher type

func NewClusterRefresher 

func NewClusterRefresher() *ClusterRefresher

Create a new cluster refresher

func (*ClusterRefresher) Start 

func (c *ClusterRefresher) Start()

Start consuming refresh events

func (*ClusterRefresher) Stop 

func (c *ClusterRefresher) Stop()

Stop consuming refresh events

func (*ClusterRefresher) TriggerDevicesChanged 

func (c *ClusterRefresher) TriggerDevicesChanged(nodeID string) bool

Trigger an event for a device being added or removed to a node

func (*ClusterRefresher) TriggerRefresh 

func (c *ClusterRefresher) TriggerRefresh() bool

Trigger a general refresh of the cluster

type ClusterService 

type ClusterService struct {
	Name   string
	Leader ServiceLeader
	Agents []ServiceAgent
}

type Context 

type Context struct {
	// The registered services for cluster configuration
	Services []*ClusterService

	// The latest inventory information
	Inventory *inventory.Config

	// The local node ID
	NodeID string

	// The etcd client for get/set config values
	EtcdClient etcd.KeysAPI

	// The implementation of executing a console command
	Executor exec.Executor

	// The process manager for launching a process
	ProcMan *proc.ProcManager

	// The root configuration directory used by services
	ConfigDir string

	// A value indicating the desired logging/tracing level
	LogLevel capnslog.LogLevel
}

The context for loading or applying the configuration state of a service.

func StartJoinCluster 

func StartJoinCluster(services []*ClusterService, configDir, nodeID, discoveryURL,
	etcdMembers, publicIPv4, privateIPv4 string, logLevel capnslog.LogLevel) (*Context, error)

StartJoinCluster initializes the cluster services to enable joining the cluster and listening for orchestration.

func (*Context) GetEtcdClient 

func (c *Context) GetEtcdClient() (etcd.KeysAPI, error)

func (*Context) GetExecutor 

func (c *Context) GetExecutor() exec.Executor

type Leader 

type Leader interface {
	OnLeadershipAcquired() error
	OnLeadershipLost() error
	GetLeaseName() string
}

Interface defining how a leader reacts to gaining or losing election, new members being added, etc.

type Lease 

type Lease interface {
	Renew(time.Duration) error
	Release() error
	MachineID() string
	Version() int
	Index() uint64
	TimeRemaining() time.Duration
}

The interfaces and implementation for leasing found in this source file comes from https://github.com/coreos/fleet/tree/master/pkg/lease We cannot reference the fleet package due to the fleet reference to the etcdclient as part of the antiquated godeps _workspace. With the move to the vendor folder, we were required to break this indirect dependency and move the source code to our own repo.

type Manager 

type Manager interface {
	GetLease(name string) (Lease, error)
	AcquireLease(name, machID string, ver int, period time.Duration) (Lease, error)
	StealLease(name, machID string, ver int, period time.Duration, idx uint64) (Lease, error)
}

type NodeConfigStatus 

type NodeConfigStatus int

func GetNodeConfigStatus 

func GetNodeConfigStatus(etcdClient etcd.KeysAPI, taskKey, nodeID string) (NodeConfigStatus, uint64, error)

func ParseNodeConfigStatus 

func ParseNodeConfigStatus(status string) NodeConfigStatus

func WatchNodeConfigStatus 

func WatchNodeConfigStatus(etcdClient etcd.KeysAPI, taskKey, nodeID string, timeout int, index *uint64) (NodeConfigStatus, error)

WatchNodeConfigStatus watches for changes to the node config status etcd key

func (NodeConfigStatus) String 

func (n NodeConfigStatus) String() string

type RefreshEvent 

type RefreshEvent struct {
	Context        *Context
	NodesAdded     *util.Set
	NodesRemoved   *util.Set
	NodesChanged   *util.Set
	NodesUnhealthy map[string]*UnhealthyNode
}

RefreshEvent type

func NewRefreshEvent 

func NewRefreshEvent() *RefreshEvent

Create a new refresh event

type RefreshKey 

type RefreshKey struct {
	Path      string
	Triggered func(response *etcd.Response, refresher *ClusterRefresher)
}

RefreshKey type

type ServiceAgent 

type ServiceAgent interface {
	// Get the name of the service agent
	Name() string

	// Initialize the agents from the context, allowing them to store desired state in etcd before orchestration starts.
	Initialize(context *Context) error

	// Configure the service according to the changes requested by the leader
	ConfigureLocalService(context *Context) error

	// Remove a service that is no longer needed
	DestroyLocalService(context *Context) error
}

type ServiceLeader 

type ServiceLeader interface {
	// Get the list of etcd keys that when changed should trigger an orchestration
	RefreshKeys() []*RefreshKey

	// Refresh the service
	HandleRefresh(e *RefreshEvent)
}

Interface implemented by a service that has been elected leader

type UnhealthyNode 

type UnhealthyNode struct {
	ID         string
	AgeSeconds int
}

UnhealthyNode type

Source Files

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