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106 lines
3.6 KiB
Markdown
106 lines
3.6 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 4 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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etcd server The Kubelet will reach out and do a watch on an etcd server. The etcd path that is watched is /registry/hosts/$(uname -n). As this is a watch, changes are noticed and acted upon very quickly.
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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**="127.0.0.1"
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The address for the info server to serve on (set to 0.0.0.0 or "" for all interfaces).
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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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**--config**=""
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Path to the config file or directory of files.
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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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**--enable_server**=true
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Enable the info server.
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**--etcd_servers**=[]
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List of etcd servers to watch (http://ip:port), comma separated.
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**--file_check_frequency**=20s
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Duration between checking config files for new data.
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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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**--http_check_frequency**=20s
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Duration between checking http for new data.
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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_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**=false
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log to standard error instead of files.
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**--manifest_url**=""
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URL for accessing the container manifest.
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**--pod_infra_container_image**="kubernetes/pause:latest"
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The image that pod infra 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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**--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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**--root_dir**="/var/lib/kubelet"
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Directory path for managing kubelet files (volume mounts,etc).
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**--stderrthreshold**=0
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logs at or above this threshold go to stderr.
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**--sync_frequency**=10s
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Max period between synchronizing running containers and config.
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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 --etcd_servers=http://127.0.0.1:4001 --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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