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144 lines
4.0 KiB
Groff
144 lines
4.0 KiB
Groff
.TH "KUBERNETES" "1" " kubernetes User Manuals" "Scott Collier" "October 2014" ""
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.SH NAME
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.PP
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kubelet \- Processes a container manifest so the containers are launched according to how they are described.
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.SH SYNOPSIS
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.PP
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\fBkubelet\fP [OPTIONS]
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.SH DESCRIPTION
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.PP
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The \fBkubernetes\fP 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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.PP
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There are 4 ways that a container manifest can be provided to the Kubelet:
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.PP
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.RS
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.nf
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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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.fi
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.SH OPTIONS
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.PP
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\fB\-\-address\fP="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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.PP
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\fB\-\-allow\_privileged\fP=false
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If true, allow containers to request privileged mode. [default=false].
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.PP
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\fB\-\-alsologtostderr\fP=false
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log to standard error as well as files.
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.PP
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\fB\-\-config\fP=""
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Path to the config file or directory of files.
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.PP
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\fB\-\-docker\_endpoint\fP=""
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If non\-empty, use this for the docker endpoint to communicate with.
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.PP
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\fB\-\-enable\_server\fP=true
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Enable the info server.
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.PP
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\fB\-\-etcd\_servers\fP=[]
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List of etcd servers to watch (
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\[la]http://ip:port\[ra]), comma separated.
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.PP
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\fB\-\-file\_check\_frequency\fP=20s
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Duration between checking config files for new data.
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.PP
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\fB\-\-hostname\_override\fP=""
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If non\-empty, will use this string as identification instead of the actual hostname.
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.PP
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\fB\-\-http\_check\_frequency\fP=20s
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Duration between checking http for new data.
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.PP
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\fB\-\-log\_backtrace\_at\fP=:0
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when logging hits line file:N, emit a stack trace.
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.PP
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\fB\-\-log\_dir\fP=""
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If non\-empty, write log files in this directory.
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.PP
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\fB\-\-log\_flush\_frequency\fP=5s
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Maximum number of seconds between log flushes.
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.PP
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\fB\-\-logtostderr\fP=false
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log to standard error instead of files.
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.PP
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\fB\-\-manifest\_url\fP=""
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URL for accessing the container manifest.
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.PP
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\fB\-\-pod\_infra\_container\_image\fP="kubernetes/pause:latest"
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The image that pod infra containers in each pod will use.
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.PP
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\fB\-\-port\fP=10250
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The port for the info server to serve on.
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.PP
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\fB\-\-registry\_burst\fP=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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.PP
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\fB\-\-registry\_qps\fP=0
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If > 0, limit registry pull QPS to this value. If 0, unlimited. [default=0.0].
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.PP
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\fB\-\-root\_dir\fP="/var/lib/kubelet"
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Directory path for managing kubelet files (volume mounts,etc).
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.PP
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\fB\-\-stderrthreshold\fP=0
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logs at or above this threshold go to stderr.
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.PP
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\fB\-\-sync\_frequency\fP=10s
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Max period between synchronizing running containers and config.
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.PP
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\fB\-\-v\fP=0
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log level for V logs.
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.PP
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\fB\-\-version\fP=false
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Print version information and quit.
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.PP
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\fB\-\-vmodule\fP=
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comma\-separated list of pattern=N settings for file\-filtered logging.
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.SH EXAMPLES
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.PP
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.RS
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.nf
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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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.fi
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.SH HISTORY
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.PP
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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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