.TH "KUBERNETES" "1" " kubernetes User Manuals" "Scott Collier" "October 2014"  ""

.SH NAME
.PP
kubelet \- Processes a container manifest so the containers are launched according to how they are described.

.SH SYNOPSIS
.PP
\fBkubelet\fP [OPTIONS]

.SH DESCRIPTION
.PP
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.

.PP
There are 4 ways that a container manifest can be provided to the Kubelet:

.PP
.RS

.nf
File Path passed as a flag on the command line. This file is rechecked every 20 seconds (configurable with a flag).
HTTP endpoint HTTP endpoint passed as a parameter on the command line. This endpoint is checked every 20 seconds (also configurable with a flag).
etcd server The Kubelet will reach out and do a watch on an etcd server. The etcd path that is watched is /registry/hosts/\$(hostname \-f). As this is a watch, changes are noticed and acted upon very quickly.
HTTP server The kubelet can also listen for HTTP and respond to a simple API (underspec'd currently) to submit a new manifest.

.fi

.SH OPTIONS
.PP
\fB\-\-address\fP="127.0.0.1"
    The address for the info server to serve on (set to 0.0.0.0 or "" for all interfaces).

.PP
\fB\-\-allow\_privileged\fP=false
    If true, allow containers to request privileged mode. [default=false].

.PP
\fB\-\-alsologtostderr\fP=false
    log to standard error as well as files.

.PP
\fB\-\-config\fP=""
    Path to the config file or directory of files.

.PP
\fB\-\-docker\_endpoint\fP=""
    If non\-empty, use this for the docker endpoint to communicate with.

.PP
\fB\-\-enable\_server\fP=true
    Enable the info server.

.PP
\fB\-\-etcd\_servers\fP=[]
    List of etcd servers to watch (
\[la]http://ip:port\[ra]), comma separated.

.PP
\fB\-\-file\_check\_frequency\fP=20s
    Duration between checking config files for new data.

.PP
\fB\-\-hostname\_override\fP=""
    If non\-empty, will use this string as identification instead of the actual hostname.

.PP
\fB\-\-http\_check\_frequency\fP=20s
    Duration between checking http for new data.

.PP
\fB\-\-log\_backtrace\_at\fP=:0
    when logging hits line file:N, emit a stack trace.

.PP
\fB\-\-log\_dir\fP=""
    If non\-empty, write log files in this directory.

.PP
\fB\-\-log\_flush\_frequency\fP=5s
    Maximum number of seconds between log flushes.

.PP
\fB\-\-logtostderr\fP=false
    log to standard error instead of files.

.PP
\fB\-\-manifest\_url\fP=""
    URL for accessing the container manifest.

.PP
\fB\-\-pod\_infra\_container\_image\fP="kubernetes/pause:latest"
    The image that pod infra containers in each pod will use.

.PP
\fB\-\-port\fP=10250
    The port for the info server to serve on.

.PP
\fB\-\-registry\_burst\fP=10
    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.

.PP
\fB\-\-registry\_qps\fP=0
    If > 0, limit registry pull QPS to this value. If 0, unlimited. [default=0.0].

.PP
\fB\-\-root\_dir\fP="/var/lib/kubelet"
    Directory path for managing kubelet files (volume mounts,etc).

.PP
\fB\-\-stderrthreshold\fP=0
    logs at or above this threshold go to stderr.

.PP
\fB\-\-sync\_frequency\fP=10s
    Max period between synchronizing running containers and config.

.PP
\fB\-\-v\fP=0
    log level for V logs.

.PP
\fB\-\-version\fP=false
    Print version information and quit.

.PP
\fB\-\-vmodule\fP=
    comma\-separated list of pattern=N settings for file\-filtered logging.

.SH EXAMPLES
.PP
.RS

.nf
/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

.fi

.SH HISTORY
.PP
October 2014, Originally compiled by Scott Collier (scollier at redhat dot com) based
 on the kubernetes source material and internal work.