mirror of https://github.com/k3s-io/k3s
254 lines
10 KiB
Markdown
254 lines
10 KiB
Markdown
% KUBERNETES(1) kubernetes User Manuals
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% Scott Collier
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% October 2014
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# NAME
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kubelet \- Processes a container manifest so the containers are launched according to how they are described.
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# SYNOPSIS
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**kubelet** [OPTIONS]
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# DESCRIPTION
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The **kubernetes** kubelet runs on each node. The Kubelet works in terms of a container manifest. A container manifest is a YAML or JSON file that describes a pod. The Kubelet takes a set of manifests that are provided in various mechanisms and ensures that the containers described in those manifests are started and continue running.
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There are 3 ways that a container manifest can be provided to the Kubelet:
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File: Path passed as a flag on the command line. This file is rechecked every 20 seconds (configurable with a flag).
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HTTP endpoint: HTTP endpoint passed as a parameter on the command line. This endpoint is checked every 20 seconds (also configurable with a flag).
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HTTP server: The kubelet can also listen for HTTP and respond to a simple API (underspec'd currently) to submit a new manifest.
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# OPTIONS
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**--address**=0.0.0.0
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The IP address for the info server to serve on (set to 0.0.0.0 for all interfaces)
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**--allow_dynamic_housekeeping**=true
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Whether to allow the housekeeping interval to be dynamic
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**--allow-privileged**=false
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If true, allow containers to request privileged mode. [default=false]
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**--alsologtostderr**=false
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log to standard error as well as files
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**--api-servers**=[]
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List of Kubernetes API servers for publishing events, and reading pods and services. (ip:port), comma separated.
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**--boot_id_file**=/proc/sys/kernel/random/boot_id
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Comma-separated list of files to check for boot-id. Use the first one that exists.
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**--cadvisor-port**=4194
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The port of the localhost cAdvisor endpoint
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**--cert-dir**="/var/run/kubernetes"
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The directory where the TLS certs are located (by default /var/run/kubernetes). If --tls_cert_file and --tls_private_key_file are provided, this flag will be ignored.
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**--cgroup_root**=""
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Optional root cgroup to use for pods. This is handled by the container runtime on a best effort basis. Default: '', which means use the container runtime default.
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**--cloud-config**=""
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The path to the cloud provider configuration file. Empty string for no configuration file.
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**--cloud-provider**=""
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The provider for cloud services. Empty string for no provider.
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**--cluster-dns**=<nil>
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IP address for a cluster DNS server. If set, kubelet will configure all containers to use this for DNS resolution in addition to the host's DNS servers
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**--cluster-domain**=""
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Domain for this cluster. If set, kubelet will configure all containers to search this domain in addition to the host's search domains
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**--config**=""
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Path to the config file or directory of files
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**--configure-cbr0**=false
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If true, kubelet will configure cbr0 based on Node.Spec.PodCIDR.
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**--container_hints**=/etc/cadvisor/container_hints.json
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location of the container hints file
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**--container_runtime**="docker"
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The container runtime to use. Possible values: 'docker', 'rkt'. Default: 'docker'.
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**--docker**=unix:///var/run/docker.sock
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docker endpoint
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**--docker-daemon-container**="/docker-daemon"
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Optional resource-only container in which to place the Docker Daemon. Empty for no container (Default: /docker-daemon).
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**--docker-endpoint**=""
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If non-empty, use this for the docker endpoint to communicate with
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**--docker_only**=false
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Only report docker containers in addition to root stats
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**--docker_root**=/var/lib/docker
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Absolute path to the Docker state root directory (default: /var/lib/docker)
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**--docker_run**=/var/run/docker
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Absolute path to the Docker run directory (default: /var/run/docker)
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**--enable-debugging-handlers**=true
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Enables server endpoints for log collection and local running of containers and commands
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**--enable_load_reader**=false
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Whether to enable cpu load reader
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**--enable-server**=true
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Enable the info server
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**--event_storage_age_limit**=default=24h
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Max length of time for which to store events (per type). Value is a comma separated list of key values, where the keys are event types (e.g.: creation, oom) or "default" and the value is a duration. Default is applied to all non-specified event types
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**--event_storage_event_limit**=default=100000
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Max number of events to store (per type). Value is a comma separated list of key values, where the keys are event types (e.g.: creation, oom) or "default" and the value is an integer. Default is applied to all non-specified event types
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**--file-check-frequency**=20s
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Duration between checking config files for new data
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**--global_housekeeping_interval**=1m0s
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Interval between global housekeepings
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**--google-json-key**=""
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The Google Cloud Platform Service Account JSON Key to use for authentication.
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**--healthz-bind-address**=127.0.0.1
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The IP address for the healthz server to serve on, defaulting to 127.0.0.1 (set to 0.0.0.0 for all interfaces)
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**--healthz-port**=10248
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The port of the localhost healthz endpoint
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**--host-network-sources**="file"
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Comma-separated list of sources from which the Kubelet allows pods to use of host network. For all sources use "*" [default="file"]
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**--hostname-override**=""
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If non-empty, will use this string as identification instead of the actual hostname.
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**--housekeeping_interval**=1s
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Interval between container housekeepings
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**--http-check-frequency**=20s
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Duration between checking http for new data
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**--image-gc-high-threshold**=90
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The percent of disk usage after which image garbage collection is always run. Default: 90%%
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**--image-gc-low-threshold**=80
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The percent of disk usage before which image garbage collection is never run. Lowest disk usage to garbage collect to. Default: 80%%
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**--kubeconfig**=/var/lib/kubelet/kubeconfig
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Path to a kubeconfig file, specifying how to authenticate to API server (the master location is set by the api-servers flag).
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**--log_backtrace_at**=:0
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when logging hits line file:N, emit a stack trace
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**--log_cadvisor_usage**=false
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Whether to log the usage of the cAdvisor container
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**--log_dir**=
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If non-empty, write log files in this directory
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**--log_flush_frequency**=5s
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Maximum number of seconds between log flushes
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**--logtostderr**=true
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log to standard error instead of files
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**--low-diskspace-threshold-mb**=256
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The absolute free disk space, in MB, to maintain. When disk space falls below this threshold, new pods would be rejected. Default: 256
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**--machine_id_file**=/etc/machine-id,/var/lib/dbus/machine-id
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Comma-separated list of files to check for machine-id. Use the first one that exists.
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**--manifest-url**=""
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URL for accessing the container manifest
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**--master-service-namespace**="default"
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The namespace from which the kubernetes master services should be injected into pods
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**--max_housekeeping_interval**=1m0s
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Largest interval to allow between container housekeepings
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**--max_pods**=100
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Number of Pods that can run on this Kubelet.
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**--maximum-dead-containers**=100
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Maximum number of old instances of a containers to retain globally. Each container takes up some disk space. Default: 100.
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**--maximum-dead-containers-per-container**=5
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Maximum number of old instances of a container to retain per container. Each container takes up some disk space. Default: 5.
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**--minimum-container-ttl-duration**=1m0s
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Minimum age for a finished container before it is garbage collected. Examples: '300ms', '10s' or '2h45m'
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**--network-plugin**=""
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The name of the network plugin to be invoked for various events in kubelet/pod lifecycle
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**--node-status-update-frequency**=10s
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Specifies how often kubelet posts node status to master. Note: be cautious when changing the constant, it must work with nodeMonitorGracePeriod in nodecontroller. Default: 10s
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**--oom-score-adj**=-900
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The oom_score_adj value for kubelet process. Values must be within the range [-1000, 1000]
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**--pod-infra-container-image**="gcr.io/google_containers/pause:0.8.0"
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The image whose network/ipc namespaces containers in each pod will use.
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**--port**=10250
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The port for the info server to serve on
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**--read-only-port**=10255
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The read-only port for the info server to serve on (set to 0 to disable)
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**--registry-burst**=10
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Maximum size of a bursty pulls, temporarily allows pulls to burst to this number, while still not exceeding registry_qps. Only used if --registry_qps > 0
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**--registry-qps**=0
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If > 0, limit registry pull QPS to this value. If 0, unlimited. [default=0.0]
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**--resource-container**="/kubelet"
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Absolute name of the resource-only container to create and run the Kubelet in (Default: /kubelet).
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**--root-dir**="/var/lib/kubelet"
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Directory path for managing kubelet files (volume mounts,etc).
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**--runonce**=false
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If true, exit after spawning pods from local manifests or remote urls. Exclusive with --api_servers, and --enable-server
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**--stderrthreshold**=2
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logs at or above this threshold go to stderr
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**--streaming-connection-idle-timeout**=0
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Maximum time a streaming connection can be idle before the connection is automatically closed. Example: '5m'
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**--sync-frequency**=10s
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Max period between synchronizing running containers and config
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**--tls-cert-file**=""
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File /gmrvcontaining x509 Certificate for HTTPS. (CA cert, if any, concatenated after server cert). If --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 passed to --cert_dir.
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**--tls-private-key-file**=""
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File containing x509 private key matching --tls_cert_file.
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**--v**=0
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log level for V logs
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**--version**=false
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Print version information and quit
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**--vmodule**=
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comma-separated list of pattern=N settings for file-filtered logging
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# EXAMPLES
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```
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/usr/bin/kubelet --logtostderr=true --v=0 --api_servers=http://127.0.0.1:8080 --address=127.0.0.1 --port=10250 --hostname_override=127.0.0.1 --allow-privileged=false
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```
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# HISTORY
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October 2014, Originally compiled by Scott Collier (scollier at redhat dot com) based
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on the kubernetes source material and internal work.
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[]()
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[]()
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