election/

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Published: Jul 1, 2016 License: Apache-2.0

README

Simple Leader Election with Kubernetes and Docker

Implementing leader election in Kubernetes

The first requirement in leader election is the specification of the set of candidates for becoming the leader. Kubernetes already uses Endpoints to represent a replicated set of pods that comprise a service, so we will re-use this same object. (aside: You might have thought that we would use ReplicationControllers, but they are tied to a specific binary, and generally you want to have a single leader even if you are in the process of performing a rolling update)

To perform leader election, we use two properties of all Kubernetes API objects:

ResourceVersions - Every API object has a unique ResourceVersion, and you can use these versions to perform compare-and-swap on Kubernetes objects Annotations - Every API object can be annotated with arbitrary key/value pairs to be used by clients.

Given these primitives, the code to use master election is relatively straightforward, and you can find it here. Let’s run it ourselves.

$ kubectl run leader-elector --image=gcr.io/google_containers/leader-elector:0.4 --replicas=3 -- --election=example

This creates a leader election set with 3 replicas:

$ kubectl get pods
NAME                   READY     STATUS    RESTARTS   AGE
leader-elector-inmr1   1/1       Running   0          13s
leader-elector-qkq00   1/1       Running   0          13s
leader-elector-sgwcq   1/1       Running   0          13s

To see which pod was chosen as the leader, you can access the logs of one of the pods, substituting one of your own pod’s names in place of ${pod_name}, (e.g. leader-elector-inmr1 from the above)

$ kubectl logs -f ${pod_name}

Alternately, you can inspect the endpoints object directly:

# ‘example’ is the name of the candidate set from the above kubectl run … command
$ kubectl get endpoints example -o yaml

Now to validate that leader election actually works, in a different terminal, run:

$ kubectl delete pods ${leader-pod-name}

This will delete the existing leader. Because the set of pods is being managed by a replication controller, a new pod replaces the one that was deleted, ensuring that the size of the replicated set is still three. Via leader election one of these three pods is selected as the new leader, and you should see the leader failover to a different pod. Because pods in Kubernetes have a grace period before termination, this may take 30-40 seconds.

The leader-election container provides a simple webserver that can serve on any address (e.g. http://localhost:4040). You can test this out by deleting the existing leader election group and creating a new one where you additionally pass in a --http=(host):(port) specification to the leader-elector image. This causes each member of the set to serve information about the leader via a webhook.

# delete the old leader elector group
$ kubectl delete rc leader-elector

# create the new group, note the --http=localhost:4040 flag
$ kubectl run leader-elector --image=gcr.io/google_containers/leader-elector:0.4 --replicas=3 -- --election=example --http=0.0.0.0:4040

# create a proxy to your Kubernetes api server
$ kubectl proxy

You can then access:

http://localhost:8001/api/v1/proxy/namespaces/default/pods/<leader-pod-name>:4040/ And you will see:

{"name":"(name-of-leader-here)"} Leader election with sidecars

Ok, that’s great, you can do leader election and find out the leader over HTTP, but how can you use it from your own application? This is where the notion of sidecars come in. In Kubernetes, Pods are made up of one or more containers. Often times, this means that you add sidecar containers to your main application to make up a Pod. (for a much more detailed treatment of this subject see my earlier blog post).

The leader-election container can serve as a sidecar that you can use from your own application. Any container in the Pod that’s interested in who the current master is can simply access http://localhost:4040 and they’ll get back a simple JSON object that contains the name of the current master. Since all containers in a Pod share the same network namespace, there’s no service discovery required!

For example, here is a simple Node.js application that connects to the leader election sidecar and prints out whether or not it is currently the master. The leader election sidecar sets its identifier to hostname by default.

var http = require('http');
// This will hold info about the current master
var master = {};

// The web handler for our nodejs application
var handleRequest = function(request, response) {
    response.writeHead(200);
    response.end("Master is " + master.name);
};

// A callback that is used for our outgoing client requests to the sidecar
var cb = function(response) {
    var data = '';
    response.on('data', function(piece) { data = data + piece; });
    response.on('end', function() { master = JSON.parse(data); });
};

// Make an async request to the sidecar at http://localhost:4040
var updateMaster = function() {
    var req = http.get({host: 'localhost', path: '/', port: 4040}, cb);
    req.on('error', function(e) { console.log('problem with request: ' + e.message); });
    req.end();
};

// Set up regular updates
updateMaster();
setInterval(updateMaster, 5000);

// set up the web server
var www = http.createServer(handleRequest);
www.listen(8080);
Of course, you can use this sidecar from any language that you choose that supports HTTP and JSON.

Directories

Path Synopsis
Godeps
_workspace/src/bitbucket.org/ww/goautoneg
HTTP Content-Type Autonegotiation.
HTTP Content-Type Autonegotiation.
_workspace/src/github.com/beorn7/perks/quantile
Package quantile computes approximate quantiles over an unbounded data stream within low memory and CPU bounds.
Package quantile computes approximate quantiles over an unbounded data stream within low memory and CPU bounds.
_workspace/src/github.com/davecgh/go-spew/spew
Package spew implements a deep pretty printer for Go data structures to aid in debugging.
Package spew implements a deep pretty printer for Go data structures to aid in debugging.
_workspace/src/github.com/emicklei/go-restful
Package restful, a lean package for creating REST-style WebServices without magic.
Package restful, a lean package for creating REST-style WebServices without magic.
_workspace/src/github.com/emicklei/go-restful/swagger
Package swagger implements the structures of the Swagger https://github.com/wordnik/swagger-spec/blob/master/versions/1.2.md
Package swagger implements the structures of the Swagger https://github.com/wordnik/swagger-spec/blob/master/versions/1.2.md
_workspace/src/github.com/fsouza/go-dockerclient
Package docker provides a client for the Docker remote API.
Package docker provides a client for the Docker remote API.
_workspace/src/github.com/fsouza/go-dockerclient/external/github.com/Sirupsen/logrus
Package logrus is a structured logger for Go, completely API compatible with the standard library logger.
Package logrus is a structured logger for Go, completely API compatible with the standard library logger.
_workspace/src/github.com/fsouza/go-dockerclient/external/github.com/docker/docker/pkg/pools
Package pools provides a collection of pools which provide various data types with buffers.
Package pools provides a collection of pools which provide various data types with buffers.
_workspace/src/github.com/fsouza/go-dockerclient/external/github.com/docker/go-units
Package units provides helper function to parse and print size and time units in human-readable format.
Package units provides helper function to parse and print size and time units in human-readable format.
_workspace/src/github.com/fsouza/go-dockerclient/external/github.com/gorilla/context
Package context stores values shared during a request lifetime.
Package context stores values shared during a request lifetime.
_workspace/src/github.com/fsouza/go-dockerclient/external/github.com/gorilla/mux
Package gorilla/mux implements a request router and dispatcher.
Package gorilla/mux implements a request router and dispatcher.
_workspace/src/github.com/fsouza/go-dockerclient/external/golang.org/x/net/context
Package context defines the Context type, which carries deadlines, cancelation signals, and other request-scoped values across API boundaries and between processes.
Package context defines the Context type, which carries deadlines, cancelation signals, and other request-scoped values across API boundaries and between processes.
_workspace/src/github.com/fsouza/go-dockerclient/external/golang.org/x/sys/unix
Package unix contains an interface to the low-level operating system primitives.
Package unix contains an interface to the low-level operating system primitives.
_workspace/src/github.com/fsouza/go-dockerclient/testing
Package testing provides a fake implementation of the Docker API, useful for testing purpose.
Package testing provides a fake implementation of the Docker API, useful for testing purpose.
_workspace/src/github.com/golang/glog
Package glog implements logging analogous to the Google-internal C++ INFO/ERROR/V setup.
Package glog implements logging analogous to the Google-internal C++ INFO/ERROR/V setup.
_workspace/src/github.com/golang/groupcache/lru
Package lru implements an LRU cache.
Package lru implements an LRU cache.
_workspace/src/github.com/golang/protobuf/proto
Package proto converts data structures to and from the wire format of protocol buffers.
Package proto converts data structures to and from the wire format of protocol buffers.
_workspace/src/github.com/google/gofuzz
Package fuzz is a library for populating go objects with random values.
Package fuzz is a library for populating go objects with random values.
_workspace/src/github.com/imdario/mergo
Package mergo merges same-type structs and maps by setting default values in zero-value fields.
Package mergo merges same-type structs and maps by setting default values in zero-value fields.
_workspace/src/github.com/juju/ratelimit
The ratelimit package provides an efficient token bucket implementation that can be used to limit the rate of arbitrary things.
The ratelimit package provides an efficient token bucket implementation that can be used to limit the rate of arbitrary things.
_workspace/src/github.com/matttproud/golang_protobuf_extensions/pbutil
Package pbutil provides record length-delimited Protocol Buffer streaming.
Package pbutil provides record length-delimited Protocol Buffer streaming.
_workspace/src/github.com/pborman/uuid
The uuid package generates and inspects UUIDs.
The uuid package generates and inspects UUIDs.
_workspace/src/github.com/prometheus/client_golang/prometheus
Package prometheus provides embeddable metric primitives for servers and standardized exposition of telemetry through a web services interface.
Package prometheus provides embeddable metric primitives for servers and standardized exposition of telemetry through a web services interface.
_workspace/src/github.com/prometheus/client_model/go
Package io_prometheus_client is a generated protocol buffer package.
Package io_prometheus_client is a generated protocol buffer package.
_workspace/src/github.com/prometheus/common/expfmt
A package for reading and writing Prometheus metrics.
A package for reading and writing Prometheus metrics.
_workspace/src/github.com/prometheus/common/model
Package model contains common data structures that are shared across Prometheus componenets and libraries.
Package model contains common data structures that are shared across Prometheus componenets and libraries.
_workspace/src/github.com/prometheus/procfs
Package procfs provides functions to retrieve system, kernel and process metrics from the pseudo-filesystem proc.
Package procfs provides functions to retrieve system, kernel and process metrics from the pseudo-filesystem proc.
_workspace/src/github.com/russross/blackfriday
Blackfriday markdown processor.
Blackfriday markdown processor.
_workspace/src/github.com/shurcooL/sanitized_anchor_name
Package sanitized_anchor_name provides a func to create sanitized anchor names.
Package sanitized_anchor_name provides a func to create sanitized anchor names.
_workspace/src/github.com/spf13/cobra
Package cobra is a commander providing a simple interface to create powerful modern CLI interfaces.
Package cobra is a commander providing a simple interface to create powerful modern CLI interfaces.
_workspace/src/github.com/spf13/pflag
Package pflag is a drop-in replacement for Go's flag package, implementing POSIX/GNU-style --flags.
Package pflag is a drop-in replacement for Go's flag package, implementing POSIX/GNU-style --flags.
_workspace/src/github.com/ugorji/go/codec
High Performance, Feature-Rich Idiomatic Go codec/encoding library for binc, msgpack, cbor, json.
High Performance, Feature-Rich Idiomatic Go codec/encoding library for binc, msgpack, cbor, json.
_workspace/src/github.com/ugorji/go/codec/codecgen
codecgen generates codec.Selfer implementations for a set of types.
codecgen generates codec.Selfer implementations for a set of types.
_workspace/src/golang.org/x/crypto/ssh
Package ssh implements an SSH client and server.
Package ssh implements an SSH client and server.
_workspace/src/golang.org/x/crypto/ssh/agent
Package agent implements a client to an ssh-agent daemon.
Package agent implements a client to an ssh-agent daemon.
_workspace/src/golang.org/x/crypto/ssh/terminal
Package terminal provides support functions for dealing with terminals, as commonly found on UNIX systems.
Package terminal provides support functions for dealing with terminals, as commonly found on UNIX systems.
_workspace/src/golang.org/x/crypto/ssh/test
This package contains integration tests for the golang.org/x/crypto/ssh package.
This package contains integration tests for the golang.org/x/crypto/ssh package.
_workspace/src/golang.org/x/net/context
Package context defines the Context type, which carries deadlines, cancelation signals, and other request-scoped values across API boundaries and between processes.
Package context defines the Context type, which carries deadlines, cancelation signals, and other request-scoped values across API boundaries and between processes.
_workspace/src/golang.org/x/net/context/ctxhttp
Package ctxhttp provides helper functions for performing context-aware HTTP requests.
Package ctxhttp provides helper functions for performing context-aware HTTP requests.
_workspace/src/gopkg.in/yaml.v2
Package yaml implements YAML support for the Go language.
Package yaml implements YAML support for the Go language.
_workspace/src/k8s.io/kubernetes/pkg/api
Package api contains the latest (or "internal") version of the Kubernetes API objects.
Package api contains the latest (or "internal") version of the Kubernetes API objects.
_workspace/src/k8s.io/kubernetes/pkg/api/errors
Package errors provides detailed error types for api field validation.
Package errors provides detailed error types for api field validation.
_workspace/src/k8s.io/kubernetes/pkg/api/errors/etcd
Package etcd provides conversion of etcd errors to API errors.
Package etcd provides conversion of etcd errors to API errors.
_workspace/src/k8s.io/kubernetes/pkg/api/install
Package install installs the v1 monolithic api, making it available as an option to all of the API encoding/decoding machinery.
Package install installs the v1 monolithic api, making it available as an option to all of the API encoding/decoding machinery.
_workspace/src/k8s.io/kubernetes/pkg/api/latest
Package latest defines the default output serializations that code should use and imports the required schemas.
Package latest defines the default output serializations that code should use and imports the required schemas.
_workspace/src/k8s.io/kubernetes/pkg/api/meta
Package meta provides functions for retrieving API metadata from objects belonging to the Kubernetes API
Package meta provides functions for retrieving API metadata from objects belonging to the Kubernetes API
_workspace/src/k8s.io/kubernetes/pkg/api/registered
Package to keep track of API Versions that should be registered in api.Scheme.
Package to keep track of API Versions that should be registered in api.Scheme.
_workspace/src/k8s.io/kubernetes/pkg/api/rest
Package rest defines common logic around changes to Kubernetes resources.
Package rest defines common logic around changes to Kubernetes resources.
_workspace/src/k8s.io/kubernetes/pkg/api/testapi
Package testapi provides a helper for retrieving the KUBE_TEST_API environment variable.
Package testapi provides a helper for retrieving the KUBE_TEST_API environment variable.
_workspace/src/k8s.io/kubernetes/pkg/api/unversioned
Package unversioned contains API types that are common to all versions.
Package unversioned contains API types that are common to all versions.
_workspace/src/k8s.io/kubernetes/pkg/api/util
TODO: This GetVersion/GetGroup arrangement is temporary and will be replaced with a GroupAndVersion type.
TODO: This GetVersion/GetGroup arrangement is temporary and will be replaced with a GroupAndVersion type.
_workspace/src/k8s.io/kubernetes/pkg/api/v1
Package v1 is the v1 version of the API.
Package v1 is the v1 version of the API.
_workspace/src/k8s.io/kubernetes/pkg/api/validation
Package validation has functions for validating the correctness of api objects and explaining what is wrong with them when they aren't valid.
Package validation has functions for validating the correctness of api objects and explaining what is wrong with them when they aren't valid.
_workspace/src/k8s.io/kubernetes/pkg/apis/componentconfig/install
Package install installs the experimental API group, making it available as an option to all of the API encoding/decoding machinery.
Package install installs the experimental API group, making it available as an option to all of the API encoding/decoding machinery.
_workspace/src/k8s.io/kubernetes/pkg/apis/extensions/install
Package install installs the experimental API group, making it available as an option to all of the API encoding/decoding machinery.
Package install installs the experimental API group, making it available as an option to all of the API encoding/decoding machinery.
_workspace/src/k8s.io/kubernetes/pkg/apis/metrics/install
Package install installs the metrics API group, making it available as an option to all of the API encoding/decoding machinery.
Package install installs the metrics API group, making it available as an option to all of the API encoding/decoding machinery.
_workspace/src/k8s.io/kubernetes/pkg/auth/user
Package user contains utilities for dealing with simple user exchange in the auth packages.
Package user contains utilities for dealing with simple user exchange in the auth packages.
_workspace/src/k8s.io/kubernetes/pkg/capabilities
package capbabilities manages system level capabilities
package capbabilities manages system level capabilities
_workspace/src/k8s.io/kubernetes/pkg/client/leaderelection
Package leaderelection implements leader election of a set of endpoints.
Package leaderelection implements leader election of a set of endpoints.
_workspace/src/k8s.io/kubernetes/pkg/client/metrics
Package metrics provides utilities for registering client metrics to Prometheus.
Package metrics provides utilities for registering client metrics to Prometheus.
_workspace/src/k8s.io/kubernetes/pkg/client/record
Package record has all client logic for recording and reporting events.
Package record has all client logic for recording and reporting events.
_workspace/src/k8s.io/kubernetes/pkg/client/unversioned
Package unversioned contains the implementation of the client side communication with the Kubernetes master.
Package unversioned contains the implementation of the client side communication with the Kubernetes master.
_workspace/src/k8s.io/kubernetes/pkg/client/unversioned/auth
Package auth defines a file format for holding authentication information needed by clients of Kubernetes.
Package auth defines a file format for holding authentication information needed by clients of Kubernetes.
_workspace/src/k8s.io/kubernetes/pkg/client/unversioned/clientcmd
Package clientcmd provides one stop shopping for building a working client from a fixed config, from a .kubeconfig file, from command line flags, or from any merged combination.
Package clientcmd provides one stop shopping for building a working client from a fixed config, from a .kubeconfig file, from command line flags, or from any merged combination.
_workspace/src/k8s.io/kubernetes/pkg/client/unversioned/fake
This is made a separate package and should only be imported by tests, because it imports testapi
This is made a separate package and should only be imported by tests, because it imports testapi
_workspace/src/k8s.io/kubernetes/pkg/client/unversioned/portforward
Package portforward adds support for SSH-like port forwarding from the client's local host to remote containers.
Package portforward adds support for SSH-like port forwarding from the client's local host to remote containers.
_workspace/src/k8s.io/kubernetes/pkg/client/unversioned/remotecommand
Package remotecommand adds support for executing commands in containers, with support for separate stdin, stdout, and stderr streams, as well as TTY.
Package remotecommand adds support for executing commands in containers, with support for separate stdin, stdout, and stderr streams, as well as TTY.
_workspace/src/k8s.io/kubernetes/pkg/conversion
Package conversion provides go object versioning and encoding/decoding mechanisms.
Package conversion provides go object versioning and encoding/decoding mechanisms.
_workspace/src/k8s.io/kubernetes/pkg/conversion/queryparams
Package queryparams provides conversion from versioned runtime objects to URL query values
Package queryparams provides conversion from versioned runtime objects to URL query values
_workspace/src/k8s.io/kubernetes/pkg/credentialprovider
Package credentialprovider supplies interfaces and implementations for docker registry providers to expose their authentication scheme.
Package credentialprovider supplies interfaces and implementations for docker registry providers to expose their authentication scheme.
_workspace/src/k8s.io/kubernetes/pkg/credentialprovider/gcp
Package gcp_credentials contains implementations of DockerConfigProvider for Google Cloud Platform.
Package gcp_credentials contains implementations of DockerConfigProvider for Google Cloud Platform.
_workspace/src/k8s.io/kubernetes/pkg/fieldpath
Package fieldpath supplies methods for extracting fields from objects given a path to a field.
Package fieldpath supplies methods for extracting fields from objects given a path to a field.
_workspace/src/k8s.io/kubernetes/pkg/fields
Package fields implements a simple field system, parsing and matching selectors with sets of fields.
Package fields implements a simple field system, parsing and matching selectors with sets of fields.
_workspace/src/k8s.io/kubernetes/pkg/kubectl
Package kubectl is a set of libraries that are used by the kubectl command line tool.
Package kubectl is a set of libraries that are used by the kubectl command line tool.
_workspace/src/k8s.io/kubernetes/pkg/kubectl/resource
Package resource assists clients in dealing with RESTful objects that match the Kubernetes API conventions.
Package resource assists clients in dealing with RESTful objects that match the Kubernetes API conventions.
_workspace/src/k8s.io/kubernetes/pkg/kubelet/qos
package qos contains helper functions for quality of service.
package qos contains helper functions for quality of service.
_workspace/src/k8s.io/kubernetes/pkg/labels
Package labels implements a simple label system, parsing and matching selectors with sets of labels.
Package labels implements a simple label system, parsing and matching selectors with sets of labels.
_workspace/src/k8s.io/kubernetes/pkg/runtime
Defines conversions between generic types and structs to map query strings to struct objects.
Defines conversions between generic types and structs to map query strings to struct objects.
_workspace/src/k8s.io/kubernetes/pkg/runtime/protobuf
Package protobuf implements ProtoBuf serialization and deserialization.
Package protobuf implements ProtoBuf serialization and deserialization.
_workspace/src/k8s.io/kubernetes/pkg/types
Package types implements various generic types used throughout kubernetes.
Package types implements various generic types used throughout kubernetes.
_workspace/src/k8s.io/kubernetes/pkg/util
Package util implements various utility functions used in both testing and implementation of Kubernetes.
Package util implements various utility functions used in both testing and implementation of Kubernetes.
_workspace/src/k8s.io/kubernetes/pkg/util/bandwidth
Package bandwidth provides utilities for bandwidth shaping
Package bandwidth provides utilities for bandwidth shaping
_workspace/src/k8s.io/kubernetes/pkg/util/chmod
Package chown provides an interface and implementations for things that run run the chmod system call.
Package chown provides an interface and implementations for things that run run the chmod system call.
_workspace/src/k8s.io/kubernetes/pkg/util/chown
Package chown provides utilities to chown a path
Package chown provides utilities to chown a path
_workspace/src/k8s.io/kubernetes/pkg/util/config
Package config provides utility objects for decoupling sources of configuration and the actual configuration state.
Package config provides utility objects for decoupling sources of configuration and the actual configuration state.
_workspace/src/k8s.io/kubernetes/pkg/util/dbus
Package dbus provides an injectable interface and implementations for D-Bus communication
Package dbus provides an injectable interface and implementations for D-Bus communication
_workspace/src/k8s.io/kubernetes/pkg/util/errors
Package errors implements various utility functions and types around errors.
Package errors implements various utility functions and types around errors.
_workspace/src/k8s.io/kubernetes/pkg/util/exec
Package exec provides an injectable interface and implementations for running commands.
Package exec provides an injectable interface and implementations for running commands.
_workspace/src/k8s.io/kubernetes/pkg/util/flushwriter
Package flushwriter implements a wrapper for a writer that flushes on every write if that writer implements the io.Flusher interface
Package flushwriter implements a wrapper for a writer that flushes on every write if that writer implements the io.Flusher interface
_workspace/src/k8s.io/kubernetes/pkg/util/httpstream
Package httpstream adds multiplexed streaming support to HTTP requests and responses via connection upgrades.
Package httpstream adds multiplexed streaming support to HTTP requests and responses via connection upgrades.
_workspace/src/k8s.io/kubernetes/pkg/util/iptables
Package iptables provides an interface and implementations for running iptables commands.
Package iptables provides an interface and implementations for running iptables commands.
_workspace/src/k8s.io/kubernetes/pkg/util/jsonpath
package jsonpath is a template engine using jsonpath syntax, which can be seen at http://goessner.net/articles/JsonPath/.
package jsonpath is a template engine using jsonpath syntax, which can be seen at http://goessner.net/articles/JsonPath/.
_workspace/src/k8s.io/kubernetes/pkg/util/limitwriter
Package limitwriter provides a writer that only allows a certain number of bytes to be written.
Package limitwriter provides a writer that only allows a certain number of bytes to be written.
_workspace/src/k8s.io/kubernetes/pkg/util/mount
Package mount defines an interface to mounting filesystems.
Package mount defines an interface to mounting filesystems.
_workspace/src/k8s.io/kubernetes/pkg/util/oom
Package oom implements utility functions relating to out of memory management.
Package oom implements utility functions relating to out of memory management.
_workspace/src/k8s.io/kubernetes/pkg/util/procfs
Package procfs implements utility functions relating to the /proc mount.
Package procfs implements utility functions relating to the /proc mount.
_workspace/src/k8s.io/kubernetes/pkg/util/proxy
Package proxy provides transport and upgrade support for proxies
Package proxy provides transport and upgrade support for proxies
_workspace/src/k8s.io/kubernetes/pkg/util/rand
Package rand provides utilities related to randomization.
Package rand provides utilities related to randomization.
_workspace/src/k8s.io/kubernetes/pkg/util/selinux
Package selinux contains selinux utility functions.
Package selinux contains selinux utility functions.
_workspace/src/k8s.io/kubernetes/pkg/util/sets
Package sets has auto-generated set types.
Package sets has auto-generated set types.
_workspace/src/k8s.io/kubernetes/pkg/util/sets/types
Package types just provides input types to the set generator.
Package types just provides input types to the set generator.
_workspace/src/k8s.io/kubernetes/pkg/util/slice
Package slice provides utility methods for common operations on slices.
Package slice provides utility methods for common operations on slices.
_workspace/src/k8s.io/kubernetes/pkg/util/wait
Package wait provides tools for polling or listening for changes to a condition.
Package wait provides tools for polling or listening for changes to a condition.
_workspace/src/k8s.io/kubernetes/pkg/util/workqueue
Package workqueue provides a simple queue that supports the following features:
Package workqueue provides a simple queue that supports the following features:
_workspace/src/k8s.io/kubernetes/pkg/util/wsstream
Package wsstream contains utilities for streaming content over WebSockets.
Package wsstream contains utilities for streaming content over WebSockets.
_workspace/src/k8s.io/kubernetes/pkg/version
Package version supplies version information collected at build time to kubernetes components.
Package version supplies version information collected at build time to kubernetes components.
_workspace/src/k8s.io/kubernetes/pkg/version/verflag
Package verflag defines utility functions to handle command line flags related to version of Kubernetes.
Package verflag defines utility functions to handle command line flags related to version of Kubernetes.
_workspace/src/k8s.io/kubernetes/pkg/watch
Package watch contains a generic watchable interface, and a fake for testing code that uses the watch interface.
Package watch contains a generic watchable interface, and a fake for testing code that uses the watch interface.
_workspace/src/k8s.io/kubernetes/pkg/watch/json
Package json implements a simple encoder and decoder for streams of watch events over io.Writer/Readers
Package json implements a simple encoder and decoder for streams of watch events over io.Writer/Readers
_workspace/src/k8s.io/kubernetes/third_party/forked/json
Package json is forked from the Go standard library to enable us to find the field of a struct that a given JSON key maps to.
Package json is forked from the Go standard library to enable us to find the field of a struct that a given JSON key maps to.
_workspace/src/k8s.io/kubernetes/third_party/forked/reflect
Package reflect is a fork of go's standard library reflection package, which allows for deep equal with equality functions defined.
Package reflect is a fork of go's standard library reflection package, which allows for deep equal with equality functions defined.
_workspace/src/k8s.io/kubernetes/third_party/golang/template
This package is copied from Go library text/template.
This package is copied from Go library text/template.
_workspace/src/speter.net/go/exp/math/dec/inf
Package inf (type inf.Dec) implements "infinite-precision" decimal arithmetic.
Package inf (type inf.Dec) implements "infinite-precision" decimal arithmetic.

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