NAME¶
puppet-agent - The puppet agent daemon
SYNOPSIS¶
Retrieves the client configuration from the puppet master and applies it to the
local host.
This service may be run as a daemon, run periodically using cron (or something
similar), or run interactively for testing purposes.
USAGE¶
puppet agent [--certname
name] [-D|--daemonize|--no-daemonize]
[-d|--debug] [--detailed-exitcodes] [--digest
digest] [--disable
[message]] [--enable] [--fingerprint] [-h|--help] [-l|--logdest syslog|
file|console] [--no-client] [--noop] [-o|--onetime] [-t|--test]
[-v|--verbose] [-V|--version] [-w|--waitforcert
seconds]
DESCRIPTION¶
This is the main puppet client. Its job is to retrieve the local
machine´s configuration from a remote server and apply it. In order to
successfully communicate with the remote server, the client must have a
certificate signed by a certificate authority that the server trusts; the
recommended method for this, at the moment, is to run a certificate authority
as part of the puppet server (which is the default). The client will connect
and request a signed certificate, and will continue connecting until it
receives one.
Once the client has a signed certificate, it will retrieve its configuration and
apply it.
USAGE NOTES¶
´puppet agent´ does its best to find a compromise between
interactive use and daemon use. Run with no arguments and no configuration, it
will go into the background, attempt to get a signed certificate, and retrieve
and apply its configuration every 30 minutes.
Some flags are meant specifically for interactive use -- in particular,
´test´, ´tags´ or ´fingerprint´ are
useful. ´test´ enables verbose logging, causes the daemon to
stay in the foreground, exits if the server´s configuration is invalid
(this happens if, for instance, you´ve left a syntax error on the
server), and exits after running the configuration once (rather than hanging
around as a long-running process).
´tags´ allows you to specify what portions of a configuration you
want to apply. Puppet elements are tagged with all of the class or definition
names that contain them, and you can use the ´tags´ flag to
specify one of these names, causing only configuration elements contained
within that class or definition to be applied. This is very useful when you
are testing new configurations -- for instance, if you are just starting to
manage ´ntpd´, you would put all of the new elements into an
´ntpd´ class, and call puppet with ´--tags ntpd´,
which would only apply that small portion of the configuration during your
testing, rather than applying the whole thing.
´fingerprint´ is a one-time flag. In this mode ´puppet
agent´ will run once and display on the console (and in the log) the
current certificate (or certificate request) fingerprint. Providing the
´--digest´ option allows to use a different digest algorithm to
generate the fingerprint. The main use is to verify that before signing a
certificate request on the master, the certificate request the master received
is the same as the one the client sent (to prevent against man-in-the-middle
attacks when signing certificates).
OPTIONS¶
Note that any configuration parameter that´s valid in the configuration
file is also a valid long argument. For example, ´server´ is a
valid configuration parameter, so you can specify ´--server
servername´ as an argument.
See the configuration file documentation at
http://docs.puppetlabs.com/references/stable/configuration.html for the full
list of acceptable parameters. A commented list of all configuration options
can also be generated by running puppet agent with
´--genconfig´.
- --certname
- Set the certname (unique ID) of the client. The master reads this unique
identifying string, which is usually set to the node´s
fully-qualified domain name, to determine which configurations the node
will receive. Use this option to debug setup problems or implement unusual
node identification schemes.
- --daemonize
- Send the process into the background. This is the default.
- --no-daemonize
- Do not send the process into the background.
- --debug
- Enable full debugging.
- --detailed-exitcodes
- Provide transaction information via exit codes. If this is enabled, an
exit code of ´2´ means there were changes, an exit code of
´4´ means there were failures during the transaction, and an
exit code of ´6´ means there were both changes and
failures.
- --digest
- Change the certificate fingerprinting digest algorithm. The default is
SHA256. Valid values depends on the version of OpenSSL installed, but will
likely contain MD5, MD2, SHA1 and SHA256.
- --disable
- Disable working on the local system. This puts a lock file in place,
causing ´puppet agent´ not to work on the system until the
lock file is removed. This is useful if you are testing a configuration
and do not want the central configuration to override the local state
until everything is tested and committed.
- Disable can also take an optional message that will be reported by the
´puppet agent´ at the next disabled run.
- ´puppet agent´ uses the same lock file while it is running,
so no more than one ´puppet agent´ process is working at a
time.
- ´puppet agent´ exits after executing this.
- --enable
- Enable working on the local system. This removes any lock file, causing
´puppet agent´ to start managing the local system again
(although it will continue to use its normal scheduling, so it might not
start for another half hour).
- ´puppet agent´ exits after executing this.
- --fingerprint
- Display the current certificate or certificate signing request fingerprint
and then exit. Use the ´--digest´ option to change the
digest algorithm used.
- --help
- Print this help message
- --logdest
- Where to send messages. Choose between syslog, the console, and a log
file. Defaults to sending messages to syslog, or the console if debugging
or verbosity is enabled.
- --no-client
- Do not create a config client. This will cause the daemon to start but not
check configuration unless it is triggered with puppet kick. This
only makes sense when puppet agent is being run with listen = true in
puppet.conf or was started with the --listen option.
- --noop
- Use ´noop´ mode where the daemon runs in a no-op or dry-run
mode. This is useful for seeing what changes Puppet will make without
actually executing the changes.
- --onetime
- Run the configuration once. Runs a single (normally daemonized) Puppet
run. Useful for interactively running puppet agent when used in
conjunction with the --no-daemonize option.
- --test
- Enable the most common options used for testing. These are
´onetime´, ´verbose´,
´ignorecache´, ´no-daemonize´,
´no-usecacheonfailure´, ´detailed-exit-codes´,
´no-splay´, and ´show_diff´.
- --verbose
- Turn on verbose reporting.
- --version
- Print the puppet version number and exit.
- --waitforcert
- This option only matters for daemons that do not yet have certificates and
it is enabled by default, with a value of 120 (seconds). This causes
´puppet agent´ to connect to the server every 2 minutes and
ask it to sign a certificate request. This is useful for the initial setup
of a puppet client. You can turn off waiting for certificates by
specifying a time of 0.
EXAMPLE¶
$ puppet agent --server puppet.domain.com
DIAGNOSTICS¶
Puppet agent accepts the following signals:
- SIGHUP
- Restart the puppet agent daemon.
- SIGINT and SIGTERM
- Shut down the puppet agent daemon.
- SIGUSR1
- Immediately retrieve and apply configurations from the puppet master.
- SIGUSR2
- Close file descriptors for log files and reopen them. Used with
logrotate.
AUTHOR¶
Luke Kanies
COPYRIGHT¶
Copyright (c) 2011 Puppet Labs, LLC Licensed under the Apache 2.0 License