Services
Files
Kubelet TLS certificate issuing
- bootstrap-tokens - generate shared secret (token), it is then used by kubelet to get actual certs from API server
Kubernetes API server
exec chpst -u kube:kube kube-apiserver \
--enable-bootstrap-token-auth \
--service-account-issuer https://localhost:6443 \
--service-cluster-ip-range 172.19.1.0/24 \
--etcd-servers http://127.0.0.1:2379 \
--enable-admission-plugins NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,Priority,ResourceQuota \
--client-ca-file /etc/kubernetes/pki/ca.crt \
--tls-cert-file /etc/kubernetes/pki/apiserver.crt \
--tls-private-key-file /etc/kubernetes/pki/apiserver.key \
--kubelet-client-certificate /etc/kubernetes/pki/apiserver-kubelet-client.crt \
--kubelet-client-key /etc/kubernetes/pki/apiserver-kubelet-client.key \
--service-account-key-file /etc/kubernetes/pki/sa.pub \
--service-account-signing-key-file /etc/kubernetes/pki/sa.key \
--requestheader-client-ca-file /etc/kubernetes/pki/front-proxy-ca.crt \
--proxy-client-cert-file /etc/kubernetes/pki/front-proxy-client.crt \
--proxy-client-key-file /etc/kubernetes/pki/front-proxy-client.key
Flag
|
Value
|
Info
|
|
--enable-bootstrap-token-auth
|
true
|
|
|
--enable-admission-plugins
|
NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,Priority,ResourceQuota
|
|
--service-account-issuer
|
https://localhost:6443 - URL to the API server (load balancer in multi-server setup) |
|
|
|
|
The Kubernetes API server validates and configures data
for the api objects which include pods, services, replicationcontrollers, and
others. The API Server services REST operations and provides the frontend to the
cluster's shared state through which all other components interact.
Usage:
kube-apiserver [flags]
Generic flags:
--advertise-address ip
The IP address on which to advertise the apiserver to members of the cluster. This
address must be reachable by the rest of the cluster. If blank, the --bind-address will
be used. If --bind-address is unspecified, the host's default interface will be used.
--cloud-provider-gce-l7lb-src-cidrs cidrs
CIDRs opened in GCE firewall for L7 LB traffic proxy & health checks (default
130.211.0.0/22,35.191.0.0/16)
--cors-allowed-origins strings
List of allowed origins for CORS, comma separated. An allowed origin can be a regular
expression to support subdomain matching. If this list is empty CORS will not be enabled.
--default-not-ready-toleration-seconds int
Indicates the tolerationSeconds of the toleration for notReady:NoExecute that is added
by default to every pod that does not already have such a toleration. (default 300)
--default-unreachable-toleration-seconds int
Indicates the tolerationSeconds of the toleration for unreachable:NoExecute that is
added by default to every pod that does not already have such a toleration. (default 300)
--enable-priority-and-fairness
If true and the APIPriorityAndFairness feature gate is enabled, replace the
max-in-flight handler with an enhanced one that queues and dispatches with priority and
fairness (default true)
--external-hostname string
The hostname to use when generating externalized URLs for this master (e.g. Swagger API
Docs or OpenID Discovery).
--feature-gates mapStringBool
A set of key=value pairs that describe feature gates for alpha/experimental features.
Options are:
APIListChunking=true|false (BETA - default=true)
APIPriorityAndFairness=true|false (BETA - default=true)
APIResponseCompression=true|false (BETA - default=true)
APISelfSubjectReview=true|false (ALPHA - default=false)
APIServerIdentity=true|false (BETA - default=true)
APIServerTracing=true|false (ALPHA - default=false)
AggregatedDiscoveryEndpoint=true|false (ALPHA - default=false)
AllAlpha=true|false (ALPHA - default=false)
AllBeta=true|false (BETA - default=false)
AnyVolumeDataSource=true|false (BETA - default=true)
AppArmor=true|false (BETA - default=true)
CPUManagerPolicyAlphaOptions=true|false (ALPHA - default=false)
CPUManagerPolicyBetaOptions=true|false (BETA - default=true)
CPUManagerPolicyOptions=true|false (BETA - default=true)
CSIMigrationPortworx=true|false (BETA - default=false)
CSIMigrationRBD=true|false (ALPHA - default=false)
CSINodeExpandSecret=true|false (ALPHA - default=false)
CSIVolumeHealth=true|false (ALPHA - default=false)
ComponentSLIs=true|false (ALPHA - default=false)
ContainerCheckpoint=true|false (ALPHA - default=false)
ContextualLogging=true|false (ALPHA - default=false)
CronJobTimeZone=true|false (BETA - default=true)
CrossNamespaceVolumeDataSource=true|false (ALPHA - default=false)
CustomCPUCFSQuotaPeriod=true|false (ALPHA - default=false)
CustomResourceValidationExpressions=true|false (BETA - default=true)
DisableCloudProviders=true|false (ALPHA - default=false)
DisableKubeletCloudCredentialProviders=true|false (ALPHA - default=false)
DownwardAPIHugePages=true|false (BETA - default=true)
DynamicResourceAllocation=true|false (ALPHA - default=false)
EventedPLEG=true|false (ALPHA - default=false)
ExpandedDNSConfig=true|false (BETA - default=true)
ExperimentalHostUserNamespaceDefaulting=true|false (BETA - default=false)
GRPCContainerProbe=true|false (BETA - default=true)
GracefulNodeShutdown=true|false (BETA - default=true)
GracefulNodeShutdownBasedOnPodPriority=true|false (BETA - default=true)
HPAContainerMetrics=true|false (ALPHA - default=false)
HPAScaleToZero=true|false (ALPHA - default=false)
HonorPVReclaimPolicy=true|false (ALPHA - default=false)
IPTablesOwnershipCleanup=true|false (ALPHA - default=false)
InTreePluginAWSUnregister=true|false (ALPHA - default=false)
InTreePluginAzureDiskUnregister=true|false (ALPHA - default=false)
InTreePluginAzureFileUnregister=true|false (ALPHA - default=false)
InTreePluginGCEUnregister=true|false (ALPHA - default=false)
InTreePluginOpenStackUnregister=true|false (ALPHA - default=false)
InTreePluginPortworxUnregister=true|false (ALPHA - default=false)
InTreePluginRBDUnregister=true|false (ALPHA - default=false)
InTreePluginvSphereUnregister=true|false (ALPHA - default=false)
JobMutableNodeSchedulingDirectives=true|false (BETA - default=true)
JobPodFailurePolicy=true|false (BETA - default=true)
JobReadyPods=true|false (BETA - default=true)
KMSv2=true|false (ALPHA - default=false)
KubeletInUserNamespace=true|false (ALPHA - default=false)
KubeletPodResources=true|false (BETA - default=true)
KubeletPodResourcesGetAllocatable=true|false (BETA - default=true)
KubeletTracing=true|false (ALPHA - default=false)
LegacyServiceAccountTokenTracking=true|false (ALPHA - default=false)
LocalStorageCapacityIsolationFSQuotaMonitoring=true|false (ALPHA - default=false)
LogarithmicScaleDown=true|false (BETA - default=true)
LoggingAlphaOptions=true|false (ALPHA - default=false)
LoggingBetaOptions=true|false (BETA - default=true)
MatchLabelKeysInPodTopologySpread=true|false (ALPHA - default=false)
MaxUnavailableStatefulSet=true|false (ALPHA - default=false)
MemoryManager=true|false (BETA - default=true)
MemoryQoS=true|false (ALPHA - default=false)
MinDomainsInPodTopologySpread=true|false (BETA - default=false)
MinimizeIPTablesRestore=true|false (ALPHA - default=false)
MultiCIDRRangeAllocator=true|false (ALPHA - default=false)
NetworkPolicyStatus=true|false (ALPHA - default=false)
NodeInclusionPolicyInPodTopologySpread=true|false (BETA - default=true)
NodeOutOfServiceVolumeDetach=true|false (BETA - default=true)
NodeSwap=true|false (ALPHA - default=false)
OpenAPIEnums=true|false (BETA - default=true)
OpenAPIV3=true|false (BETA - default=true)
PDBUnhealthyPodEvictionPolicy=true|false (ALPHA - default=false)
PodAndContainerStatsFromCRI=true|false (ALPHA - default=false)
PodDeletionCost=true|false (BETA - default=true)
PodDisruptionConditions=true|false (BETA - default=true)
PodHasNetworkCondition=true|false (ALPHA - default=false)
PodSchedulingReadiness=true|false (ALPHA - default=false)
ProbeTerminationGracePeriod=true|false (BETA - default=true)
ProcMountType=true|false (ALPHA - default=false)
ProxyTerminatingEndpoints=true|false (BETA - default=true)
QOSReserved=true|false (ALPHA - default=false)
ReadWriteOncePod=true|false (ALPHA - default=false)
RecoverVolumeExpansionFailure=true|false (ALPHA - default=false)
RemainingItemCount=true|false (BETA - default=true)
RetroactiveDefaultStorageClass=true|false (BETA - default=true)
RotateKubeletServerCertificate=true|false (BETA - default=true)
SELinuxMountReadWriteOncePod=true|false (ALPHA - default=false)
SeccompDefault=true|false (BETA - default=true)
ServerSideFieldValidation=true|false (BETA - default=true)
SizeMemoryBackedVolumes=true|false (BETA - default=true)
StatefulSetAutoDeletePVC=true|false (ALPHA - default=false)
StatefulSetStartOrdinal=true|false (ALPHA - default=false)
StorageVersionAPI=true|false (ALPHA - default=false)
StorageVersionHash=true|false (BETA - default=true)
TopologyAwareHints=true|false (BETA - default=true)
TopologyManager=true|false (BETA - default=true)
TopologyManagerPolicyAlphaOptions=true|false (ALPHA - default=false)
TopologyManagerPolicyBetaOptions=true|false (BETA - default=false)
TopologyManagerPolicyOptions=true|false (ALPHA - default=false)
UserNamespacesStatelessPodsSupport=true|false (ALPHA - default=false)
ValidatingAdmissionPolicy=true|false (ALPHA - default=false)
VolumeCapacityPriority=true|false (ALPHA - default=false)
WinDSR=true|false (ALPHA - default=false)
WinOverlay=true|false (BETA - default=true)
WindowsHostNetwork=true|false (ALPHA - default=true)
--goaway-chance float
To prevent HTTP/2 clients from getting stuck on a single apiserver, randomly close a
connection (GOAWAY). The client's other in-flight requests won't be affected, and the
client will reconnect, likely landing on a different apiserver after going through the
load balancer again. This argument sets the fraction of requests that will be sent a
GOAWAY. Clusters with single apiservers, or which don't use a load balancer, should NOT
enable this. Min is 0 (off), Max is .02 (1/50 requests); .001 (1/1000) is a recommended
starting point.
--livez-grace-period duration
This option represents the maximum amount of time it should take for apiserver to
complete its startup sequence and become live. From apiserver's start time to when this
amount of time has elapsed, /livez will assume that unfinished post-start hooks will
complete successfully and therefore return true.
--max-mutating-requests-inflight int
This and --max-requests-inflight are summed to determine the server's total concurrency
limit (which must be positive) if --enable-priority-and-fairness is true. Otherwise,
this flag limits the maximum number of mutating requests in flight, or a zero value
disables the limit completely. (default 200)
--max-requests-inflight int
This and --max-mutating-requests-inflight are summed to determine the server's total
concurrency limit (which must be positive) if --enable-priority-and-fairness is true.
Otherwise, this flag limits the maximum number of non-mutating requests in flight, or a
zero value disables the limit completely. (default 400)
--min-request-timeout int
An optional field indicating the minimum number of seconds a handler must keep a request
open before timing it out. Currently only honored by the watch request handler, which
picks a randomized value above this number as the connection timeout, to spread out
load. (default 1800)
--request-timeout duration
An optional field indicating the duration a handler must keep a request open before
timing it out. This is the default request timeout for requests but may be overridden by
flags such as --min-request-timeout for specific types of requests. (default 1m0s)
--shutdown-delay-duration duration
Time to delay the termination. During that time the server keeps serving requests
normally. The endpoints /healthz and /livez will return success, but /readyz immediately
returns failure. Graceful termination starts after this delay has elapsed. This can be
used to allow load balancer to stop sending traffic to this server.
--shutdown-send-retry-after
If true the HTTP Server will continue listening until all non long running request(s) in
flight have been drained, during this window all incoming requests will be rejected with
a status code 429 and a 'Retry-After' response header, in addition 'Connection: close'
response header is set in order to tear down the TCP connection when idle.
--strict-transport-security-directives strings
List of directives for HSTS, comma separated. If this list is empty, then HSTS
directives will not be added. Example: 'max-age=31536000,includeSubDomains,preload'
Etcd flags:
--delete-collection-workers int
Number of workers spawned for DeleteCollection call. These are used to speed up
namespace cleanup. (default 1)
--enable-garbage-collector
Enables the generic garbage collector. MUST be synced with the corresponding flag of the
kube-controller-manager. (default true)
--encryption-provider-config string
The file containing configuration for encryption providers to be used for storing
secrets in etcd
--encryption-provider-config-automatic-reload
Determines if the file set by --encryption-provider-config should be automatically
reloaded if the disk contents change. Setting this to true disables the ability to
uniquely identify distinct KMS plugins via the API server healthz endpoints.
--etcd-cafile string
SSL Certificate Authority file used to secure etcd communication.
--etcd-certfile string
SSL certification file used to secure etcd communication.
--etcd-compaction-interval duration
The interval of compaction requests. If 0, the compaction request from apiserver is
disabled. (default 5m0s)
--etcd-count-metric-poll-period duration
Frequency of polling etcd for number of resources per type. 0 disables the metric
collection. (default 1m0s)
--etcd-db-metric-poll-interval duration
The interval of requests to poll etcd and update metric. 0 disables the metric
collection (default 30s)
--etcd-healthcheck-timeout duration
The timeout to use when checking etcd health. (default 2s)
--etcd-keyfile string
SSL key file used to secure etcd communication.
--etcd-prefix string
The prefix to prepend to all resource paths in etcd. (default "/registry")
--etcd-readycheck-timeout duration
The timeout to use when checking etcd readiness (default 2s)
--etcd-servers strings
List of etcd servers to connect with (scheme://ip:port), comma separated.
--etcd-servers-overrides strings
Per-resource etcd servers overrides, comma separated. The individual override format:
group/resource#servers, where servers are URLs, semicolon separated. Note that this
applies only to resources compiled into this server binary.
--lease-reuse-duration-seconds int
The time in seconds that each lease is reused. A lower value could avoid large number of
objects reusing the same lease. Notice that a too small value may cause performance
problems at storage layer. (default 60)
--storage-backend string
The storage backend for persistence. Options: 'etcd3' (default).
--storage-media-type string
The media type to use to store objects in storage. Some resources or storage backends
may only support a specific media type and will ignore this setting. Supported media
types: [application/json, application/yaml, application/vnd.kubernetes.protobuf]
(default "application/vnd.kubernetes.protobuf")
--watch-cache
Enable watch caching in the apiserver (default true)
--watch-cache-sizes strings
Watch cache size settings for some resources (pods, nodes, etc.), comma separated. The
individual setting format: resource[.group]#size, where resource is lowercase plural (no
version), group is omitted for resources of apiVersion v1 (the legacy core API) and
included for others, and size is a number. This option is only meaningful for resources
built into the apiserver, not ones defined by CRDs or aggregated from external servers,
and is only consulted if the watch-cache is enabled. The only meaningful size setting to
supply here is zero, which means to disable watch caching for the associated resource;
all non-zero values are equivalent and mean to not disable watch caching for that resource
Secure serving flags:
--bind-address ip
The IP address on which to listen for the --secure-port port. The associated
interface(s) must be reachable by the rest of the cluster, and by CLI/web clients. If
blank or an unspecified address (0.0.0.0 or ::), all interfaces will be used. (default
0.0.0.0)
--cert-dir string
The directory where the TLS certs are located. If --tls-cert-file and
--tls-private-key-file are provided, this flag will be ignored. (default
"/var/run/kubernetes")
--http2-max-streams-per-connection int
The limit that the server gives to clients for the maximum number of streams in an
HTTP/2 connection. Zero means to use golang's default.
--permit-address-sharing
If true, SO_REUSEADDR will be used when binding the port. This allows binding to
wildcard IPs like 0.0.0.0 and specific IPs in parallel, and it avoids waiting for the
kernel to release sockets in TIME_WAIT state. [default=false]
--permit-port-sharing
If true, SO_REUSEPORT will be used when binding the port, which allows more than one
instance to bind on the same address and port. [default=false]
--secure-port int
The port on which to serve HTTPS with authentication and authorization. It cannot be
switched off with 0. (default 6443)
--tls-cert-file string
File containing the default x509 Certificate for HTTPS. (CA cert, if any, concatenated
after server cert). If HTTPS serving is enabled, and --tls-cert-file and
--tls-private-key-file are not provided, a self-signed certificate and key are generated
for the public address and saved to the directory specified by --cert-dir.
--tls-cipher-suites strings
Comma-separated list of cipher suites for the server. If omitted, the default Go cipher
suites will be used.
Preferred values: TLS_AES_128_GCM_SHA256, TLS_AES_256_GCM_SHA384,
TLS_CHACHA20_POLY1305_SHA256, TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384, TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256, TLS_RSA_WITH_AES_128_CBC_SHA,
TLS_RSA_WITH_AES_128_GCM_SHA256, TLS_RSA_WITH_AES_256_CBC_SHA,
TLS_RSA_WITH_AES_256_GCM_SHA384.
Insecure values: TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256, TLS_ECDHE_RSA_WITH_RC4_128_SHA,
TLS_RSA_WITH_3DES_EDE_CBC_SHA, TLS_RSA_WITH_AES_128_CBC_SHA256, TLS_RSA_WITH_RC4_128_SHA.
--tls-min-version string
Minimum TLS version supported. Possible values: VersionTLS10, VersionTLS11,
VersionTLS12, VersionTLS13
--tls-private-key-file string
File containing the default x509 private key matching --tls-cert-file.
--tls-sni-cert-key namedCertKey
A pair of x509 certificate and private key file paths, optionally suffixed with a list
of domain patterns which are fully qualified domain names, possibly with prefixed
wildcard segments. The domain patterns also allow IP addresses, but IPs should only be
used if the apiserver has visibility to the IP address requested by a client. If no
domain patterns are provided, the names of the certificate are extracted. Non-wildcard
matches trump over wildcard matches, explicit domain patterns trump over extracted
names. For multiple key/certificate pairs, use the --tls-sni-cert-key multiple times.
Examples: "example.crt,example.key" or "foo.crt,foo.key:*.foo.com,foo.com". (default [])
Auditing flags:
--audit-log-batch-buffer-size int
The size of the buffer to store events before batching and writing. Only used in batch
mode. (default 10000)
--audit-log-batch-max-size int
The maximum size of a batch. Only used in batch mode. (default 1)
--audit-log-batch-max-wait duration
The amount of time to wait before force writing the batch that hadn't reached the max
size. Only used in batch mode.
--audit-log-batch-throttle-burst int
Maximum number of requests sent at the same moment if ThrottleQPS was not utilized
before. Only used in batch mode.
--audit-log-batch-throttle-enable
Whether batching throttling is enabled. Only used in batch mode.
--audit-log-batch-throttle-qps float32
Maximum average number of batches per second. Only used in batch mode.
--audit-log-compress
If set, the rotated log files will be compressed using gzip.
--audit-log-format string
Format of saved audits. "legacy" indicates 1-line text format for each event. "json"
indicates structured json format. Known formats are legacy,json. (default "json")
--audit-log-maxage int
The maximum number of days to retain old audit log files based on the timestamp encoded
in their filename.
--audit-log-maxbackup int
The maximum number of old audit log files to retain. Setting a value of 0 will mean
there's no restriction on the number of files.
--audit-log-maxsize int
The maximum size in megabytes of the audit log file before it gets rotated.
--audit-log-mode string
Strategy for sending audit events. Blocking indicates sending events should block server
responses. Batch causes the backend to buffer and write events asynchronously. Known
modes are batch,blocking,blocking-strict. (default "blocking")
--audit-log-path string
If set, all requests coming to the apiserver will be logged to this file. '-' means
standard out.
--audit-log-truncate-enabled
Whether event and batch truncating is enabled.
--audit-log-truncate-max-batch-size int
Maximum size of the batch sent to the underlying backend. Actual serialized size can be
several hundreds of bytes greater. If a batch exceeds this limit, it is split into
several batches of smaller size. (default 10485760)
--audit-log-truncate-max-event-size int
Maximum size of the audit event sent to the underlying backend. If the size of an event
is greater than this number, first request and response are removed, and if this doesn't
reduce the size enough, event is discarded. (default 102400)
--audit-log-version string
API group and version used for serializing audit events written to log. (default
"audit.k8s.io/v1")
--audit-policy-file string
Path to the file that defines the audit policy configuration.
--audit-webhook-batch-buffer-size int
The size of the buffer to store events before batching and writing. Only used in batch
mode. (default 10000)
--audit-webhook-batch-max-size int
The maximum size of a batch. Only used in batch mode. (default 400)
--audit-webhook-batch-max-wait duration
The amount of time to wait before force writing the batch that hadn't reached the max
size. Only used in batch mode. (default 30s)
--audit-webhook-batch-throttle-burst int
Maximum number of requests sent at the same moment if ThrottleQPS was not utilized
before. Only used in batch mode. (default 15)
--audit-webhook-batch-throttle-enable
Whether batching throttling is enabled. Only used in batch mode. (default true)
--audit-webhook-batch-throttle-qps float32
Maximum average number of batches per second. Only used in batch mode. (default 10)
--audit-webhook-config-file string
Path to a kubeconfig formatted file that defines the audit webhook configuration.
--audit-webhook-initial-backoff duration
The amount of time to wait before retrying the first failed request. (default 10s)
--audit-webhook-mode string
Strategy for sending audit events. Blocking indicates sending events should block server
responses. Batch causes the backend to buffer and write events asynchronously. Known
modes are batch,blocking,blocking-strict. (default "batch")
--audit-webhook-truncate-enabled
Whether event and batch truncating is enabled.
--audit-webhook-truncate-max-batch-size int
Maximum size of the batch sent to the underlying backend. Actual serialized size can be
several hundreds of bytes greater. If a batch exceeds this limit, it is split into
several batches of smaller size. (default 10485760)
--audit-webhook-truncate-max-event-size int
Maximum size of the audit event sent to the underlying backend. If the size of an event
is greater than this number, first request and response are removed, and if this doesn't
reduce the size enough, event is discarded. (default 102400)
--audit-webhook-version string
API group and version used for serializing audit events written to webhook. (default
"audit.k8s.io/v1")
Features flags:
--contention-profiling
Enable lock contention profiling, if profiling is enabled
--profiling
Enable profiling via web interface host:port/debug/pprof/ (default true)
Authentication flags:
--anonymous-auth
Enables anonymous requests to the secure port of the API server. Requests that are not
rejected by another authentication method are treated as anonymous requests. Anonymous
requests have a username of system:anonymous, and a group name of
system:unauthenticated. (default true)
--api-audiences strings
Identifiers of the API. The service account token authenticator will validate that
tokens used against the API are bound to at least one of these audiences. If the
--service-account-issuer flag is configured and this flag is not, this field defaults to
a single element list containing the issuer URL.
--authentication-token-webhook-cache-ttl duration
The duration to cache responses from the webhook token authenticator. (default 2m0s)
--authentication-token-webhook-config-file string
File with webhook configuration for token authentication in kubeconfig format. The API
server will query the remote service to determine authentication for bearer tokens.
--authentication-token-webhook-version string
The API version of the authentication.k8s.io TokenReview to send to and expect from the
webhook. (default "v1beta1")
--client-ca-file string
If set, any request presenting a client certificate signed by one of the authorities in
the client-ca-file is authenticated with an identity corresponding to the CommonName of
the client certificate.
--enable-bootstrap-token-auth
Enable to allow secrets of type 'bootstrap.kubernetes.io/token' in the 'kube-system'
namespace to be used for TLS bootstrapping authentication.
--oidc-ca-file string
If set, the OpenID server's certificate will be verified by one of the authorities in
the oidc-ca-file, otherwise the host's root CA set will be used.
--oidc-client-id string
The client ID for the OpenID Connect client, must be set if oidc-issuer-url is set.
--oidc-groups-claim string
If provided, the name of a custom OpenID Connect claim for specifying user groups. The
claim value is expected to be a string or array of strings. This flag is experimental,
please see the authentication documentation for further details.
--oidc-groups-prefix string
If provided, all groups will be prefixed with this value to prevent conflicts with other
authentication strategies.
--oidc-issuer-url string
The URL of the OpenID issuer, only HTTPS scheme will be accepted. If set, it will be
used to verify the OIDC JSON Web Token (JWT).
--oidc-required-claim mapStringString
A key=value pair that describes a required claim in the ID Token. If set, the claim is
verified to be present in the ID Token with a matching value. Repeat this flag to
specify multiple claims.
--oidc-signing-algs strings
Comma-separated list of allowed JOSE asymmetric signing algorithms. JWTs with a
supported 'alg' header values are: RS256, RS384, RS512, ES256, ES384, ES512, PS256,
PS384, PS512. Values are defined by RFC 7518
https://tools.ietf.org/html/rfc7518#section-3.1. (default [RS256])
--oidc-username-claim string
The OpenID claim to use as the user name. Note that claims other than the default
('sub') is not guaranteed to be unique and immutable. This flag is experimental, please
see the authentication documentation for further details. (default "sub")
--oidc-username-prefix string
If provided, all usernames will be prefixed with this value. If not provided, username
claims other than 'email' are prefixed by the issuer URL to avoid clashes. To skip any
prefixing, provide the value '-'.
--requestheader-allowed-names strings
List of client certificate common names to allow to provide usernames in headers
specified by --requestheader-username-headers. If empty, any client certificate
validated by the authorities in --requestheader-client-ca-file is allowed.
--requestheader-client-ca-file string
Root certificate bundle to use to verify client certificates on incoming requests before
trusting usernames in headers specified by --requestheader-username-headers. WARNING:
generally do not depend on authorization being already done for incoming requests.
--requestheader-extra-headers-prefix strings
List of request header prefixes to inspect. X-Remote-Extra- is suggested.
--requestheader-group-headers strings
List of request headers to inspect for groups. X-Remote-Group is suggested.
--requestheader-username-headers strings
List of request headers to inspect for usernames. X-Remote-User is common.
--service-account-extend-token-expiration
Turns on projected service account expiration extension during token generation, which
helps safe transition from legacy token to bound service account token feature. If this
flag is enabled, admission injected tokens would be extended up to 1 year to prevent
unexpected failure during transition, ignoring value of
service-account-max-token-expiration. (default true)
--service-account-issuer stringArray
Identifier of the service account token issuer. The issuer will assert this identifier
in "iss" claim of issued tokens. This value is a string or URI. If this option is not a
valid URI per the OpenID Discovery 1.0 spec, the ServiceAccountIssuerDiscovery feature
will remain disabled, even if the feature gate is set to true. It is highly recommended
that this value comply with the OpenID spec:
https://openid.net/specs/openid-connect-discovery-1_0.html. In practice, this means that
service-account-issuer must be an https URL. It is also highly recommended that this URL
be capable of serving OpenID discovery documents at
{service-account-issuer}/.well-known/openid-configuration. When this flag is specified
multiple times, the first is used to generate tokens and all are used to determine which
issuers are accepted.
--service-account-jwks-uri string
Overrides the URI for the JSON Web Key Set in the discovery doc served at
/.well-known/openid-configuration. This flag is useful if the discovery docand key set
are served to relying parties from a URL other than the API server's external (as
auto-detected or overridden with external-hostname).
--service-account-key-file stringArray
File containing PEM-encoded x509 RSA or ECDSA private or public keys, used to verify
ServiceAccount tokens. The specified file can contain multiple keys, and the flag can be
specified multiple times with different files. If unspecified, --tls-private-key-file is
used. Must be specified when --service-account-signing-key-file is provided
--service-account-lookup
If true, validate ServiceAccount tokens exist in etcd as part of authentication.
(default true)
--service-account-max-token-expiration duration
The maximum validity duration of a token created by the service account token issuer. If
an otherwise valid TokenRequest with a validity duration larger than this value is
requested, a token will be issued with a validity duration of this value.
--token-auth-file string
If set, the file that will be used to secure the secure port of the API server via token
authentication.
Authorization flags:
--authorization-mode strings
Ordered list of plug-ins to do authorization on secure port. Comma-delimited list of:
AlwaysAllow,AlwaysDeny,ABAC,Webhook,RBAC,Node. (default [AlwaysAllow])
--authorization-policy-file string
File with authorization policy in json line by line format, used with
--authorization-mode=ABAC, on the secure port.
--authorization-webhook-cache-authorized-ttl duration
The duration to cache 'authorized' responses from the webhook authorizer. (default 5m0s)
--authorization-webhook-cache-unauthorized-ttl duration
The duration to cache 'unauthorized' responses from the webhook authorizer. (default 30s)
--authorization-webhook-config-file string
File with webhook configuration in kubeconfig format, used with
--authorization-mode=Webhook. The API server will query the remote service to determine
access on the API server's secure port.
--authorization-webhook-version string
The API version of the authorization.k8s.io SubjectAccessReview to send to and expect
from the webhook. (default "v1beta1")
Cloud provider flags:
--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.
API enablement flags:
--runtime-config mapStringString
A set of key=value pairs that enable or disable built-in APIs. Supported options are:
v1=true|false for the core API group
<group>/<version>=true|false for a specific API group and version (e.g. apps/v1=true)
api/all=true|false controls all API versions
api/ga=true|false controls all API versions of the form v[0-9]+
api/beta=true|false controls all API versions of the form v[0-9]+beta[0-9]+
api/alpha=true|false controls all API versions of the form v[0-9]+alpha[0-9]+
api/legacy is deprecated, and will be removed in a future version
Egress selector flags:
--egress-selector-config-file string
File with apiserver egress selector configuration.
Admission flags:
--admission-control strings
Admission is divided into two phases. In the first phase, only mutating admission
plugins run. In the second phase, only validating admission plugins run. The names in
the below list may represent a validating plugin, a mutating plugin, or both. The order
of plugins in which they are passed to this flag does not matter. Comma-delimited list
of: AlwaysAdmit, AlwaysDeny, AlwaysPullImages, CertificateApproval, CertificateSigning,
CertificateSubjectRestriction, DefaultIngressClass, DefaultStorageClass,
DefaultTolerationSeconds, DenyServiceExternalIPs, EventRateLimit,
ExtendedResourceToleration, ImagePolicyWebhook, LimitPodHardAntiAffinityTopology,
LimitRanger, MutatingAdmissionWebhook, NamespaceAutoProvision, NamespaceExists,
NamespaceLifecycle, NodeRestriction, OwnerReferencesPermissionEnforcement,
PersistentVolumeClaimResize, PersistentVolumeLabel, PodNodeSelector, PodSecurity,
PodTolerationRestriction, Priority, ResourceQuota, RuntimeClass, SecurityContextDeny,
ServiceAccount, StorageObjectInUseProtection, TaintNodesByCondition,
ValidatingAdmissionPolicy, ValidatingAdmissionWebhook. (DEPRECATED: Use
--enable-admission-plugins or --disable-admission-plugins instead. Will be removed in a
future version.)
--admission-control-config-file string
File with admission control configuration.
--disable-admission-plugins strings
admission plugins that should be disabled although they are in the default enabled
plugins list (NamespaceLifecycle, LimitRanger, ServiceAccount, TaintNodesByCondition,
PodSecurity, Priority, DefaultTolerationSeconds, DefaultStorageClass,
StorageObjectInUseProtection, PersistentVolumeClaimResize, RuntimeClass,
CertificateApproval, CertificateSigning, CertificateSubjectRestriction,
DefaultIngressClass, MutatingAdmissionWebhook, ValidatingAdmissionPolicy,
ValidatingAdmissionWebhook, ResourceQuota). Comma-delimited list of admission plugins:
AlwaysAdmit, AlwaysDeny, AlwaysPullImages, CertificateApproval, CertificateSigning,
CertificateSubjectRestriction, DefaultIngressClass, DefaultStorageClass,
DefaultTolerationSeconds, DenyServiceExternalIPs, EventRateLimit,
ExtendedResourceToleration, ImagePolicyWebhook, LimitPodHardAntiAffinityTopology,
LimitRanger, MutatingAdmissionWebhook, NamespaceAutoProvision, NamespaceExists,
NamespaceLifecycle, NodeRestriction, OwnerReferencesPermissionEnforcement,
PersistentVolumeClaimResize, PersistentVolumeLabel, PodNodeSelector, PodSecurity,
PodTolerationRestriction, Priority, ResourceQuota, RuntimeClass, SecurityContextDeny,
ServiceAccount, StorageObjectInUseProtection, TaintNodesByCondition,
ValidatingAdmissionPolicy, ValidatingAdmissionWebhook. The order of plugins in this flag
does not matter.
--enable-admission-plugins strings
admission plugins that should be enabled in addition to default enabled ones
(NamespaceLifecycle, LimitRanger, ServiceAccount, TaintNodesByCondition, PodSecurity,
Priority, DefaultTolerationSeconds, DefaultStorageClass, StorageObjectInUseProtection,
PersistentVolumeClaimResize, RuntimeClass, CertificateApproval, CertificateSigning,
CertificateSubjectRestriction, DefaultIngressClass, MutatingAdmissionWebhook,
ValidatingAdmissionPolicy, ValidatingAdmissionWebhook, ResourceQuota). Comma-delimited
list of admission plugins: AlwaysAdmit, AlwaysDeny, AlwaysPullImages,
CertificateApproval, CertificateSigning, CertificateSubjectRestriction,
DefaultIngressClass, DefaultStorageClass, DefaultTolerationSeconds,
DenyServiceExternalIPs, EventRateLimit, ExtendedResourceToleration, ImagePolicyWebhook,
LimitPodHardAntiAffinityTopology, LimitRanger, MutatingAdmissionWebhook,
NamespaceAutoProvision, NamespaceExists, NamespaceLifecycle, NodeRestriction,
OwnerReferencesPermissionEnforcement, PersistentVolumeClaimResize,
PersistentVolumeLabel, PodNodeSelector, PodSecurity, PodTolerationRestriction, Priority,
ResourceQuota, RuntimeClass, SecurityContextDeny, ServiceAccount,
StorageObjectInUseProtection, TaintNodesByCondition, ValidatingAdmissionPolicy,
ValidatingAdmissionWebhook. The order of plugins in this flag does not matter.
Metrics flags:
--allow-metric-labels stringToString
The map from metric-label to value allow-list of this label. The key's format is
<MetricName>,<LabelName>. The value's format is <allowed_value>,<allowed_value>...e.g.
metric1,label1='v1,v2,v3', metric1,label2='v1,v2,v3' metric2,label1='v1,v2,v3'. (default [])
--disabled-metrics strings
This flag provides an escape hatch for misbehaving metrics. You must provide the fully
qualified metric name in order to disable it. Disclaimer: disabling metrics is higher in
precedence than showing hidden metrics.
--show-hidden-metrics-for-version string
The previous version for which you want to show hidden metrics. Only the previous minor
version is meaningful, other values will not be allowed. The format is <major>.<minor>,
e.g.: '1.16'. The purpose of this format is make sure you have the opportunity to notice
if the next release hides additional metrics, rather than being surprised when they are
permanently removed in the release after that.
Logs flags:
--log-flush-frequency duration
Maximum number of seconds between log flushes (default 5s)
--log-json-info-buffer-size quantity
[Alpha] In JSON format with split output streams, the info messages can be buffered for
a while to increase performance. The default value of zero bytes disables buffering. The
size can be specified as number of bytes (512), multiples of 1000 (1K), multiples of
1024 (2Ki), or powers of those (3M, 4G, 5Mi, 6Gi). Enable the LoggingAlphaOptions
feature gate to use this.
--log-json-split-stream
[Alpha] In JSON format, write error messages to stderr and info messages to stdout. The
default is to write a single stream to stdout. Enable the LoggingAlphaOptions feature
gate to use this.
--logging-format string
Sets the log format. Permitted formats: "json" (gated by LoggingBetaOptions), "text".
(default "text")
-v, --v Level
number for the log level verbosity
--vmodule pattern=N,...
comma-separated list of pattern=N settings for file-filtered logging (only works for
text log format)
Traces flags:
--tracing-config-file string
File with apiserver tracing configuration.
Misc flags:
--aggregator-reject-forwarding-redirect
Aggregator reject forwarding redirect response back to client. (default true)
--allow-privileged
If true, allow privileged containers. [default=false]
--enable-aggregator-routing
Turns on aggregator routing requests to endpoints IP rather than cluster IP.
--endpoint-reconciler-type string
Use an endpoint reconciler (master-count, lease, none) master-count is deprecated, and
will be removed in a future version. (default "lease")
--event-ttl duration
Amount of time to retain events. (default 1h0m0s)
--kubelet-certificate-authority string
Path to a cert file for the certificate authority.
--kubelet-client-certificate string
Path to a client cert file for TLS.
--kubelet-client-key string
Path to a client key file for TLS.
--kubelet-preferred-address-types strings
List of the preferred NodeAddressTypes to use for kubelet connections. (default
[Hostname,InternalDNS,InternalIP,ExternalDNS,ExternalIP])
--kubelet-timeout duration
Timeout for kubelet operations. (default 5s)
--kubernetes-service-node-port int
If non-zero, the Kubernetes master service (which apiserver creates/maintains) will be
of type NodePort, using this as the value of the port. If zero, the Kubernetes master
service will be of type ClusterIP.
--max-connection-bytes-per-sec int
If non-zero, throttle each user connection to this number of bytes/sec. Currently only
applies to long-running requests.
--proxy-client-cert-file string
Client certificate used to prove the identity of the aggregator or kube-apiserver when
it must call out during a request. This includes proxying requests to a user api-server
and calling out to webhook admission plugins. It is expected that this cert includes a
signature from the CA in the --requestheader-client-ca-file flag. That CA is published
in the 'extension-apiserver-authentication' configmap in the kube-system namespace.
Components receiving calls from kube-aggregator should use that CA to perform their half
of the mutual TLS verification.
--proxy-client-key-file string
Private key for the client certificate used to prove the identity of the aggregator or
kube-apiserver when it must call out during a request. This includes proxying requests
to a user api-server and calling out to webhook admission plugins.
--service-account-signing-key-file string
Path to the file that contains the current private key of the service account token
issuer. The issuer will sign issued ID tokens with this private key.
--service-cluster-ip-range string
A CIDR notation IP range from which to assign service cluster IPs. This must not overlap
with any IP ranges assigned to nodes or pods. Max of two dual-stack CIDRs is allowed.
--service-node-port-range portRange
A port range to reserve for services with NodePort visibility. This must not overlap
with the ephemeral port range on nodes. Example: '30000-32767'. Inclusive at both ends
of the range. (default 30000-32767)
Global flags:
-h, --help
help for kube-apiserver
--version version[=true]
Print version information and quit
