Class: Puppet::Application::Agent

Inherits:

Puppet::Application

• Object
• Puppet::Application
• Puppet::Application::Agent

Defined in:

lib/puppet/application/agent.rb

Constant Summary

Constants inherited from Puppet::Application

DOCPATTERN, SHOULD_PARSE_CONFIG_DEPRECATION_MSG

Constants included from Util

Util::AbsolutePathPosix, Util::AbsolutePathWindows, Util::DEFAULT_POSIX_MODE, Util::DEFAULT_WINDOWS_MODE

Constants included from Util::POSIX

Util::POSIX::LOCALE_ENV_VARS, Util::POSIX::USER_ENV_VARS

Constants included from Util::SymbolicFileMode

Util::SymbolicFileMode::SetGIDBit, Util::SymbolicFileMode::SetUIDBit, Util::SymbolicFileMode::StickyBit, Util::SymbolicFileMode::SymbolicMode, Util::SymbolicFileMode::SymbolicSpecialToBit

Instance Attribute Summary

Attributes inherited from Puppet::Application

#command_line, #options

Instance Method Summary

• #app_defaults ⇒ Object
• #fingerprint ⇒ Object
• #help ⇒ Object
• #main(daemon) ⇒ Object
• #onetime(daemon) ⇒ Object
• #preinit ⇒ Object
• #run_command ⇒ Object
• #setup ⇒ Object
• #setup_test ⇒ Object

  Enable all of the most common test options.

Methods inherited from Puppet::Application

[], available_application_names, banner, clear!, clear?, clear_everything_for_tests, #configure_indirector_routes, controlled_run, exit, find, #handle_logdest_arg, #handlearg, #initialize, #initialize_app_defaults, interrupted?, #log_runtime_environment, #name, option, option_parser_commands, #parse_options, restart!, restart_requested?, #run, run_mode, #set_log_level, #setup_logs, should_not_parse_config, should_parse_config, should_parse_config?, stop!, stop_requested?, try_load_class

Methods included from Util

absolute_path?, activerecord_version, benchmark, binread, chuser, classproxy, deterministic_rand, execfail, execpipe, execute, exit_on_fail, logmethods, memory, path_to_uri, pretty_backtrace, proxy, replace_file, safe_posix_fork, symbolizehash, thinmark, uri_to_path, which, withenv, withumask

Methods included from Util::POSIX

#get_posix_field, #gid, #idfield, #methodbyid, #methodbyname, #search_posix_field, #uid

Methods included from Util::SymbolicFileMode

#normalize_symbolic_mode, #symbolic_mode_to_int, #valid_symbolic_mode?

Constructor Details

This class inherits a constructor from Puppet::Application

Instance Method Details

#app_defaults ⇒ Object

# File 'lib/puppet/application/agent.rb', line 10

def app_defaults
  super.merge({
    :catalog_terminus => :rest,
    :catalog_cache_terminus => :json,
    :node_terminus => :rest,
    :facts_terminus => :facter,
  })
end

#fingerprint ⇒ Object

# File 'lib/puppet/application/agent.rb', line 329

def fingerprint
  host = Puppet::SSL::Host.new
  unless cert = host.certificate || host.certificate_request
    $stderr.puts "Fingerprint asked but no certificate nor certificate request have yet been issued"
    exit(1)
    return
  end
  unless digest = cert.digest(options[:digest].to_s)
    raise ArgumentError, "Could not get fingerprint for digest '#{options[:digest]}'"
  end
  puts digest.to_s
end

#help ⇒ Object

# File 'lib/puppet/application/agent.rb', line 77

def help
  <<-'HELP'

puppet-agent(8) -- 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|eventlog|<FILE>|console]
[--masterport <PORT>] [--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 Puppet setting that's valid in the configuration file is also a
valid long argument. For example, 'server' is a valid setting, so you can
specify '--server <servername>' as an argument. Boolean settings translate into
'--setting' and '--no-setting' pairs.

See the configuration file documentation at
http://docs.puppetlabs.com/references/stable/configuration.html for the
full list of acceptable settings. A commented list of all settings 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.
(This is a Puppet setting, and can go in puppet.conf.)

* --daemonize:
Send the process into the background. This is the default.
(This is a Puppet setting, and can go in puppet.conf. Note the special 'no-'
prefix for boolean settings on the command line.)

* --no-daemonize:
Do not send the process into the background.
(This is a Puppet setting, and can go in puppet.conf. Note the special 'no-'
prefix for boolean settings on the command line.)

* --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 log messages. Choose between 'syslog' (the POSIX syslog
service), 'eventlog' (the Windows Event Log), 'console', or the path to a log
file. If debugging or verbosity is enabled, this defaults to 'console'.
Otherwise, it defaults to 'syslog' on POSIX systems and 'eventlog' on Windows.

* --masterport:
The port on which to contact the puppet master.
(This is a Puppet setting, and can go in puppet.conf.)

* --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.
(This is a Puppet setting, and can go in puppet.conf. Note the special 'no-'
prefix for boolean settings on the command line.)

* --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.
(This is a Puppet setting, and can go in puppet.conf. Note the special 'no-'
prefix for boolean settings on the command line.)

* --test:
Enable the most common options used for testing. These are 'onetime',
'verbose', 'ignorecache', 'no-daemonize', 'no-usecacheonfailure',
'detailed-exitcodes', '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.
(This is a Puppet setting, and can go in puppet.conf. Note the special 'no-'
prefix for boolean settings on the command line.)


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

  HELP
end

#main(daemon) ⇒ Object

# File 'lib/puppet/application/agent.rb', line 372

def main(daemon)
  if Puppet[:listen]
    setup_listen(daemon)
  end
  Puppet.notice "Starting Puppet client version #{Puppet.version}"

  daemon.start
end

#onetime(daemon) ⇒ Object

# File 'lib/puppet/application/agent.rb', line 342

def onetime(daemon)
  if Puppet[:listen]
    Puppet.notice "Ignoring --listen on onetime run"
  end

  unless options[:client]
    Puppet.err "onetime is specified but there is no client"
    exit(43)
    return
  end

  daemon.set_signal_traps

  begin
    exitstatus = daemon.agent.run
  rescue => detail
    Puppet.log_exception(detail)
  end

  daemon.stop(:exit => false)

  if not exitstatus
    exit(1)
  elsif options[:detailed_exitcodes] then
    exit(exitstatus)
  else
    exit(0)
  end
end

#preinit ⇒ Object

# File 'lib/puppet/application/agent.rb', line 19

def preinit
  # Do an initial trap, so that cancels don't get a stack trace.
  Signal.trap(:INT) do
    $stderr.puts "Cancelling startup"
    exit(0)
  end

  {
    :waitforcert => nil,
    :detailed_exitcodes => false,
    :verbose => false,
    :debug => false,
    :setdest => false,
    :enable => false,
    :disable => false,
    :client => true,
    :fqdn => nil,
    :serve => [],
    :digest => 'SHA256',
    :graph => true,
    :fingerprint => false,
  }.each do |opt,val|
    options[opt] = val
  end

  @argv = ARGV.dup
end

#run_command ⇒ Object

# File 'lib/puppet/application/agent.rb', line 311

def run_command
  if options[:fingerprint]
    fingerprint
  else
    # It'd be nice to daemonize later, but we have to daemonize before
    # waiting for certificates so that we don't block
    daemon = daemonize_process_when(Puppet[:daemonize])

    wait_for_certificates

    if Puppet[:onetime]
      onetime(daemon)
    else
      main(daemon)
    end
  end
end

#setup ⇒ Object

# File 'lib/puppet/application/agent.rb', line 393

def setup
  setup_test if options[:test]

  setup_logs

  exit(Puppet.settings.print_configs ? 0 : 1) if Puppet.settings.print_configs?

  if options[:fqdn]
    Puppet[:certname] = options[:fqdn]
  end

  Puppet.settings.use :main, :agent, :ssl

  # Always ignoreimport for agent. It really shouldn't even try to import,
  # but this is just a temporary band-aid.
  Puppet[:ignoreimport] = true

  Puppet::Transaction::Report.indirection.terminus_class = :rest
  # we want the last report to be persisted locally
  Puppet::Transaction::Report.indirection.cache_class = :yaml

  if Puppet[:catalog_cache_terminus]
    Puppet::Resource::Catalog.indirection.cache_class = Puppet[:catalog_cache_terminus]
  end

  if options[:fingerprint]
    # in fingerprint mode we just need
    # access to the local files and we don't need a ca
    Puppet::SSL::Host.ca_location = :none
  else
    Puppet::SSL::Host.ca_location = :remote
    setup_agent
  end
end

#setup_test ⇒ Object

Enable all of the most common test options.

# File 'lib/puppet/application/agent.rb', line 382

def setup_test
  Puppet.settings.handlearg("--ignorecache")
  Puppet.settings.handlearg("--no-usecacheonfailure")
  Puppet.settings.handlearg("--no-splay")
  Puppet.settings.handlearg("--show_diff")
  Puppet.settings.handlearg("--no-daemonize")
  options[:verbose] = true
  Puppet[:onetime] = true
  options[:detailed_exitcodes] = true
end