kube-controller-manager最佳配置

kubernetes version: 1.6.2

Kube-controller-manager Configuration

kube-controller-manager一共有72个flag配置,具体如下:

flag

value

default value

comments

--address ip

0.0.0.0

The IP address to serve on (set to 0.0.0.0 for all interfaces) (default 0.0.0.0)

--allocate-node-cidrs

Should CIDRs for Pods be allocated and set on the cloud provider.

--attach-detach-reconcile-sync-period duration

1m0s

The reconciler sync wait time between volume attach detach. This duration must be larger than one second, and increasing this value from the default may allow for volumes to be mismatched with pods. (default 1m0s)

--azure-container-registry-config string

Path to the file container Azure container registry configuration information.

--cloud-config string

The path to the cloud provider configuration file. Empty string for no configuration file.

--cloud-provider string

The provider for cloud services. Empty string for no provider.

--cluster-cidr string

CIDR Range for Pods in cluster.

--cluster-name string

kubernetes

The instance prefix for the cluster (default "kubernetes")

--cluster-signing-cert-file string

/etc/kubernetes/ca/ca.pem

Filename containing a PEM-encoded X509 CA certificate used to issue cluster-scoped certificates (default "/etc/kubernetes/ca/ca.pem")

--cluster-signing-key-file string

/etc/kubernetes/ca/ca.key

Filename containing a PEM-encoded RSA or ECDSA private key used to sign cluster-scoped certificates (default "/etc/kubernetes/ca/ca.key")

--concurrent-deployment-syncs int32

5

The number of deployment objects that are allowed to sync concurrently. Larger number = more responsive deployments, but more CPU (and network) load (default 5)

--concurrent-endpoint-syncs int32

5

The number of endpoint syncing operations that will be done concurrently. Larger number = faster endpoint updating, but more CPU (and network) load (default 5)

--concurrent-gc-syncs int32

20

The number of garbage collector workers that are allowed to sync concurrently. (default 20)

--concurrent-namespace-syncs int32

2

The number of namespace objects that are allowed to sync concurrently. Larger number = more responsive namespace termination, but more CPU (and network) load (default 2)

--concurrent-replicaset-syncs int32

5

The number of replica sets that are allowed to sync concurrently. Larger number = more responsive replica management, but more CPU (and network) load (default 5)

--concurrent-resource-quota-syncs int32

5

The number of resource quotas that are allowed to sync concurrently. Larger number = more responsive quota management, but more CPU (and network) load (default 5)

--concurrent-service-syncs int32

1

The number of services that are allowed to sync concurrently. Larger number = more responsive service management, but more CPU (and network) load (default 1)

--concurrent-serviceaccount-token-syncs int32

5

The number of service account token objects that are allowed to sync concurrently. Larger number = more responsive token generation, but more CPU (and network) load (default 5)

--concurrent-rc-syncs int32

5

The number of replication controllers that are allowed to sync concurrently. Larger number = more responsive replica management, but more CPU (and network) load (default 5)

--configure-cloud-routes

true

Should CIDRs allocated by allocate-node-cidrs be configured on the cloud provider. (default true)

--contention-profiling

Enable lock contention profiling, if profiling is enabled

--controller-start-interval duration

Interval between starting controller managers.

--controllers stringSlice

*

A list of controllers to enable. '*' enables all on-by-default controllers, 'foo' enables the controller named 'foo', '-foo' disables the controller named 'foo'. <br/> All controllers: attachdetach, bootstrapsigner, certificatesigningrequests, cronjob, daemonset, deployment, disruption, endpoint, garbagecollector, horizontalpodautoscaling, job, namespace, node, persistentvolume-binder, podgc, replicaset, replicationcontroller, resourcequota, route, service, serviceaccount, serviceaccount-token, statefuleset, tokencleaner, ttl <br/> Disabled-by-default controllers: bootstrapsigner, tokencleaner (default [*])

--deployment-controller-sync-period duration

30s

Period for syncing the deployments. (default 30s)

--disable-attach-detach-reconcile-sync

Disable volume attach detach reconciler sync. Disabling this may cause volumes to be mismatched with pods. Use wisely.

--enable-dynamic-provisioning

true

Enable dynamic provisioning for environments that support it. (default true)

--enable-garbage-collector

true

Enables the generic garbage collector. MUST be synced with the corresponding flag of the kube-apiserver. (default true)

--enable-hostpath-provisioner

Enable HostPath PV provisioning when running without a cloud provider. This allows testing and development of provisioning features. HostPath provisioning is not supported in any way, won't work in a multi-node cluster, and should not be used for anything other than testing or development.

--enable-taint-manager

true

WARNING: Beta feature. If set to true, enables NoExecute Taints and will evict all not-tolerating Pods running on Nodes tainted with these kinds of Taints. (default true)

--feature-gates mapStringBool

A set of key=value pairs that describe feature gates for alpha/experimental features. Options are: <br/> Accelerators=true

--flex-volume-plugin-dir string

/usr/libexec/kubernetes/kubelet-plugins/volume/exec/

Full path of the directory in which the flex volume plugin should search for additional third party volume plugins. (default "/usr/libexec/kubernetes/kubelet-plugins/volume/exec/")

--google-json-key string

The Google Cloud Platform Service Account JSON Key to use for authentication.

--horizontal-pod-autoscaler-sync-period duration

30s

The period for syncing the number of pods in horizontal pod autoscaler. (default 30s)

--horizontal-pod-autoscaler-use-rest-clients

WARNING: alpha feature. If set to true, causes the horizontal pod autoscaler controller to use REST clients through the kube-aggregator, instead of using the legacy metrics client through the API server proxy. This is required for custom metrics support in the horizonal pod autoscaler.

--insecure-experimental-approve-all-kubelet-csrs-for-group string

The group for which the controller-manager will auto approve all CSRs for kubelet client certificates.

--kube-api-burst int32

30

Burst to use while talking with kubernetes apiserver (default 30)

--kube-api-content-type string

application/vnd.kubernetes.protobuf

Content type of requests sent to apiserver. (default "application/vnd.kubernetes.protobuf")

--kube-api-qps float32

20

QPS to use while talking with kubernetes apiserver (default 20)

--kubeconfig string

Path to kubeconfig file with authorization and master location information.

--large-cluster-size-threshold int32

50

Number of nodes from which NodeController treats the cluster as large for the eviction logic purposes. --secondary-node-eviction-rate is implicitly overridden to 0 for clusters this size or smaller. (default 50)

--leader-elect

true

Start a leader election client and gain leadership before executing the main loop. Enable this when running replicated components for high availability. (default true)

--leader-elect-lease-duration duration

15s

The duration that non-leader candidates will wait after observing a leadership renewal until attempting to acquire leadership of a led but unrenewed leader slot. This is effectively the maximum duration that a leader can be stopped before it is replaced by another candidate. This is only applicable if leader election is enabled. (default 15s)

--leader-elect-renew-deadline duration

10s

The interval between attempts by the acting master to renew a leadership slot before it stops leading. This must be less than or equal to the lease duration. This is only applicable if leader election is enabled. (default 10s)

--leader-elect-retry-period duration

2s

The duration the clients should wait between attempting acquisition and renewal of a leadership. This is only applicable if leader election is enabled. (default 2s)

--master string

The address of the Kubernetes API server (overrides any value in kubeconfig)

--min-resync-period duration

12h0m0

The resync period in reflectors will be random between MinResyncPeriod and 2*MinResyncPeriod (default 12h0m0s)

--namespace-sync-period duration

5m0s

The period for syncing namespace life-cycle updates (default 5m0s)

--node-cidr-mask-size int32

24

Mask size for node cidr in cluster. (default 24)

--node-eviction-rate float32

0.1

Number of nodes per second on which pods are deleted in case of node failure when a zone is healthy (see --unhealthy-zone-threshold for definition of healthy/unhealthy). Zone refers to entire cluster in non-multizone clusters. (default 0.1)

--node-monitor-grace-period duration

40s

Amount of time which we allow running Node to be unresponsive before marking it unhealthy. Must be N times more than kubelet's nodeStatusUpdateFrequency, where N means number of retries allowed for kubelet to post node status. (default 40s)

--node-monitor-period duration

5s

The period for syncing NodeStatus in NodeController. (default 5s)

--node-startup-grace-period duration

1m0s

Amount of time which we allow starting Node to be unresponsive before marking it unhealthy. (default 1m0s)

--pod-eviction-timeout duration

5m0s

The grace period for deleting pods on failed nodes. (default 5m0s)

--port int32

10252

The port that the controller-manager's http service runs on (default 10252)

--profiling

true

Enable profiling via web interface host:port/debug/pprof/ (default true)

--pv-recycler-increment-timeout-nfs int32

30

the increment of time added per Gi to ActiveDeadlineSeconds for an NFS scrubber pod (default 30)

--pv-recycler-minimum-timeout-hostpath int32

60

The minimum ActiveDeadlineSeconds to use for a HostPath Recycler pod. This is for development and testing only and will not work in a multi-node cluster. (default 60)

--pv-recycler-minimum-timeout-nfs int32

300

The minimum ActiveDeadlineSeconds to use for an NFS Recycler pod (default 300)

--pv-recycler-pod-template-filepath-hostpath string

The file path to a pod definition used as a template for HostPath persistent volume recycling. This is for development and testing only and will not work in a multi-node cluster.

--pv-recycler-pod-template-filepath-nfs string

The file path to a pod definition used as a template for NFS persistent volume recycling

--pv-recycler-timeout-increment-hostpath int32

30

the increment of time added per Gi to ActiveDeadlineSeconds for a HostPath scrubber pod. This is for development and testing only and will not work in a multi-node cluster. (default 30)

--pvclaimbinder-sync-period duration

15s

The period for syncing persistent volumes and persistent volume claims (default 15s)

--resource-quota-sync-period duration

5m0s

The period for syncing quota usage status in the system (default 5m0s)

--root-ca-file string

If set, this root certificate authority will be included in service account's token secret. This must be a valid PEM-encoded CA bundle.

--route-reconciliation-period duration

10s

The period for reconciling routes created for Nodes by cloud provider. (default 10s)

--secondary-node-eviction-rate float32

0.01

Number of nodes per second on which pods are deleted in case of node failure when a zone is unhealthy (see --unhealthy-zone-threshold for definition of healthy/unhealthy). Zone refers to entire cluster in non-multizone clusters. This value is implicitly overridden to 0 if the cluster size is smaller than --large-cluster-size-threshold. (default 0.01)

--service-account-private-key-file string

Filename containing a PEM-encoded private RSA or ECDSA key used to sign service account tokens.

--service-cluster-ip-range string

CIDR Range for Services in cluster.

--service-sync-period duration

5m0s

The period for syncing services with their external load balancers (default 5m0s)

--terminated-pod-gc-threshold int32

12500

Number of terminated pods that can exist before the terminated pod garbage collector starts deleting terminated pods. If <= 0, the terminated pod garbage collector is disabled. (default 12500)

--unhealthy-zone-threshold float32

0.55

Fraction of Nodes in a zone which needs to be not Ready (minimum 3) for zone to be treated as unhealthy. (default 0.55)

--use-service-account-credentials

If true, use individual service account credentials for each controller.

kube-controller-manager Configuration We Should First Care About

在72个flag中,我梳理出了我们私有云环境需要注意或配置的项,如下表所示。

flag

value

default value

comments

--address ip

0.0.0.0

The IP address to serve on (set to 0.0.0.0 for all interfaces) (default 0.0.0.0)

--attach-detach-reconcile-sync-period duration

1m0s

The reconciler sync wait time between volume attach detach. This duration must be larger than one second, and increasing this value from the default may allow for volumes to be mismatched with pods. (default 1m0s)

--cluster-cidr string

CIDR Range for Pods in cluster.

--cluster-name string

kubernetes

The instance prefix for the cluster (default "kubernetes")

--cluster-signing-cert-file string

/etc/kubernetes/ca/ca.pem

Filename containing a PEM-encoded X509 CA certificate used to issue cluster-scoped certificates (default "/etc/kubernetes/ca/ca.pem")

--cluster-signing-key-file string

/etc/kubernetes/ca/ca.key

Filename containing a PEM-encoded RSA or ECDSA private key used to sign cluster-scoped certificates (default "/etc/kubernetes/ca/ca.key")

--contention-profiling

Enable lock contention profiling, if profiling is enabled

--enable-garbage-collector

true

Enables the generic garbage collector. MUST be synced with the corresponding flag of the kube-apiserver. (default true)

--flex-volume-plugin-dir string

/usr/libexec/kubernetes/kubelet-plugins/volume/exec/

Full path of the directory in which the flex volume plugin should search for additional third party volume plugins. (default "/usr/libexec/kubernetes/kubelet-plugins/volume/exec/")

--kubeconfig string

Path to kubeconfig file with authorization and master location information.

--large-cluster-size-threshold int32

50

Number of nodes from which NodeController treats the cluster as large for the eviction logic purposes. --secondary-node-eviction-rate is implicitly overridden to 0 for clusters this size or smaller. (default 50)

--master string

The address of the Kubernetes API server (overrides any value in kubeconfig)

--node-cidr-mask-size int32

24

Mask size for node cidr in cluster. (default 24)

--node-eviction-rate float32

0.1

Number of nodes per second on which pods are deleted in case of node failure when a zone is healthy (see --unhealthy-zone-threshold for definition of healthy/unhealthy). Zone refers to entire cluster in non-multizone clusters. (default 0.1)

--node-monitor-grace-period duration

40s

Amount of time which we allow running Node to be unresponsive before marking it unhealthy. Must be N times more than kubelet's nodeStatusUpdateFrequency, where N means number of retries allowed for kubelet to post node status. (default 40s)

--node-startup-grace-period duration

1m0s ?

Amount of time which we allow starting Node to be unresponsive before marking it unhealthy. (default 1m0s)

--pod-eviction-timeout duration

5m0s

The grace period for deleting pods on failed nodes. (default 5m0s)

--port int32

10252

The port that the controller-manager's http service runs on (default 10252)

--resource-quota-sync-period duration

5m0s

The period for syncing quota usage status in the system (default 5m0s)

--root-ca-file string

If set, this root certificate authority will be included in service account's token secret. This must be a valid PEM-encoded CA bundle.

--secondary-node-eviction-rate float32

0.01

Number of nodes per second on which pods are deleted in case of node failure when a zone is unhealthy (see --unhealthy-zone-threshold for definition of healthy/unhealthy). Zone refers to entire cluster in non-multizone clusters. This value is implicitly overridden to 0 if the cluster size is smaller than --large-cluster-size-threshold. (default 0.01)

--service-account-private-key-file string

Filename containing a PEM-encoded private RSA or ECDSA key used to sign service account tokens.

--service-cluster-ip-range string

CIDR Range for Services in cluster.

--terminated-pod-gc-threshold int32

12500

Number of terminated pods that can exist before the terminated pod garbage collector starts deleting terminated pods. If <= 0, the terminated pod garbage collector is disabled. (default 12500)

--unhealthy-zone-threshold float32

0.55

Fraction of Nodes in a zone which needs to be not Ready (minimum 3) for zone to be treated as unhealthy. (default 0.55)

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