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Kubernetes平台介绍
KubernetesoverviewBasicUnit:Pod,Node,Volume,Labels,Endpoint,Binding,etcAggregation:ReplicaSet,DaemonSet,PetSet,Deployment,etcControlloop:kube-proxy,scheduler,replicacontroller,etc
Kubernetesoverview
Kubernetes1.3+InfrastructuresupportfordiverseapplicationworkloadsE.g.Legacyapplication,Statefulapplication,etcEnhancedclustermanagementpoliciesandtoolchainsE.g.Federation,Networkpolicy,etcPerformanceandPerformanceE.g.Protocolbufferserialization,etcd3,etc
DiverseworkloadsInitContainerPetSetScheduledJobDisruptionbudget
Initcontainer-alphaGoal:Performtasksbeforenormalcontainers12ABPodInitContainersRegularContainersBehavior:InitcontainersruninsequenceOnefailedcontainerfailsentirepodRegularcontainerswaituntilallinitcontainerscompleteUseCases:Dependency,Self-registration,Volumeinitialization,Decouplefromapplicationimages,etc
InitcontainerapiVersion:v1kind:Podmetadata:name:nginx]annotations:pod.alpha.kubernetes.io/init-containers:[{name:install,image:busybox,command:[wget,-O,/work-dir/index.html,http://kubernetes.io/index.html],volumeMounts:[{name:workdir,mountPath:/work-dir}]}spec:containers:-name:nginximage:nginxports:-containerPort:80alphaSpec:initContainers:-name:installImage:busyboxcommand:[wget,-O,/work-dir/index.html,http://kubernetes.io/index.html]volumeMounts:name:workdirmountPath:“/work-dir”containers:-name:nginximage:nginxports:-containerPort:80stable
InitcontainerDiscussionPointsPodstatus?Healthcheck?ResourcesandQoS?Updatetoinitcontainer?
PetSet-alphaGoal:Supportstateful/clustered applicationwhichrequiresstrongeridentityThreeidentities:Name(index)NetworkStorageUsecases:Quorumswithleaderelection:zookeeper,etcdDecentralizedQuorums:CassandraDatabaseslikeMySQL
PetSet●NetworkidentityStablehostnameacrosscluster,acrosspodrestartStabledomainnameusingheadlessservice0 Name(index)1$kubectlget
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