# Copyright (C) 2012 Hewlett-Packard Development Company, L.P. # # Author: Avishai Ish-Shalom # Author: Mike Moulton # Author: Juerg Haefliger # # This file is part of cloud-init. See LICENSE file for license information. """ Chef ---- **Summary:** module that configures, starts and installs chef. This module enables chef to be installed (from packages or from gems, or from omnibus). Before this occurs chef configurations are written to disk (validation.pem, client.pem, firstboot.json, client.rb), and needed chef folders/directories are created (/etc/chef and /var/log/chef and so-on). Then once installing proceeds correctly if configured chef will be started (in daemon mode or in non-daemon mode) and then once that has finished (if ran in non-daemon mode this will be when chef finishes converging, if ran in daemon mode then no further actions are possible since chef will have forked into its own process) then a post run function can run that can do finishing activities (such as removing the validation pem file). **Internal name:** ``cc_chef`` **Module frequency:** per always **Supported distros:** all **Config keys**:: chef: directories: (defaulting to /etc/chef, /var/log/chef, /var/lib/chef, /var/cache/chef, /var/backups/chef, /var/run/chef) validation_cert: (optional string to be written to file validation_key) special value 'system' means set use existing file validation_key: (optional the path for validation_cert. default /etc/chef/validation.pem) firstboot_path: (path to write run_list and initial_attributes keys that should also be present in this configuration, defaults to /etc/chef/firstboot.json) exec: boolean to run or not run chef (defaults to false, unless a gem installed is requested where this will then default to true) chef.rb template keys (if falsey, then will be skipped and not written to /etc/chef/client.rb) chef: client_key: encrypted_data_bag_secret: environment: file_backup_path: file_cache_path: json_attribs: log_level: log_location: node_name: omnibus_url: omnibus_url_retries: omnibus_version: pid_file: server_url: show_time: ssl_verify_mode: validation_cert: validation_key: validation_name: """ import itertools import json import os from cloudinit import templater from cloudinit import url_helper from cloudinit import util import six RUBY_VERSION_DEFAULT = "1.8" CHEF_DIRS = tuple([ '/etc/chef', '/var/log/chef', '/var/lib/chef', '/var/cache/chef', '/var/backups/chef', '/var/run/chef', ]) REQUIRED_CHEF_DIRS = tuple([ '/etc/chef', ]) # Used if fetching chef from a omnibus style package OMNIBUS_URL = "https://www.chef.io/chef/install.sh" OMNIBUS_URL_RETRIES = 5 CHEF_VALIDATION_PEM_PATH = '/etc/chef/validation.pem' CHEF_FB_PATH = '/etc/chef/firstboot.json' CHEF_RB_TPL_DEFAULTS = { # These are ruby symbols... 'ssl_verify_mode': ':verify_none', 'log_level': ':info', # These are not symbols... 'log_location': '/var/log/chef/client.log', 'validation_key': CHEF_VALIDATION_PEM_PATH, 'validation_cert': None, 'client_key': "/etc/chef/client.pem", 'json_attribs': CHEF_FB_PATH, 'file_cache_path': "/var/cache/chef", 'file_backup_path': "/var/backups/chef", 'pid_file': "/var/run/chef/client.pid", 'show_time': True, 'encrypted_data_bag_secret': None, } CHEF_RB_TPL_BOOL_KEYS = frozenset(['show_time']) CHEF_RB_TPL_PATH_KEYS = frozenset([ 'log_location', 'validation_key', 'client_key', 'file_cache_path', 'json_attribs', 'file_cache_path', 'pid_file', 'encrypted_data_bag_secret', ]) CHEF_RB_TPL_KEYS = list(CHEF_RB_TPL_DEFAULTS.keys()) CHEF_RB_TPL_KEYS.extend(CHEF_RB_TPL_BOOL_KEYS) CHEF_RB_TPL_KEYS.extend(CHEF_RB_TPL_PATH_KEYS) CHEF_RB_TPL_KEYS.extend([ 'server_url', 'node_name', 'environment', 'validation_name', ]) CHEF_RB_TPL_KEYS = frozenset(CHEF_RB_TPL_KEYS) CHEF_RB_PATH = '/etc/chef/client.rb' CHEF_EXEC_PATH = '/usr/bin/chef-client' CHEF_EXEC_DEF_ARGS = tuple(['-d', '-i', '1800', '-s', '20']) def is_installed(): if not os.path.isfile(CHEF_EXEC_PATH): return False if not os.access(CHEF_EXEC_PATH, os.X_OK): return False return True def post_run_chef(chef_cfg, log): delete_pem = util.get_cfg_option_bool(chef_cfg, 'delete_validation_post_exec', default=False) if delete_pem and os.path.isfile(CHEF_VALIDATION_PEM_PATH): os.unlink(CHEF_VALIDATION_PEM_PATH) def get_template_params(iid, chef_cfg, log): params = CHEF_RB_TPL_DEFAULTS.copy() # Allow users to overwrite any of the keys they want (if they so choose), # when a value is None, then the value will be set to None and no boolean # or string version will be populated... for (k, v) in chef_cfg.items(): if k not in CHEF_RB_TPL_KEYS: log.debug("Skipping unknown chef template key '%s'", k) continue if v is None: params[k] = None else: # This will make the value a boolean or string... if k in CHEF_RB_TPL_BOOL_KEYS: params[k] = util.get_cfg_option_bool(chef_cfg, k) else: params[k] = util.get_cfg_option_str(chef_cfg, k) # These ones are overwritten to be exact values... params.update({ 'generated_by': util.make_header(), 'node_name': util.get_cfg_option_str(chef_cfg, 'node_name', default=iid), 'environment': util.get_cfg_option_str(chef_cfg, 'environment', default='_default'), # These two are mandatory... 'server_url': chef_cfg['server_url'], 'validation_name': chef_cfg['validation_name'], }) return params def handle(name, cfg, cloud, log, _args): """Handler method activated by cloud-init.""" # If there isn't a chef key in the configuration don't do anything if 'chef' not in cfg: log.debug(("Skipping module named %s," " no 'chef' key in configuration"), name) return chef_cfg = cfg['chef'] # Ensure the chef directories we use exist chef_dirs = util.get_cfg_option_list(chef_cfg, 'directories') if not chef_dirs: chef_dirs = list(CHEF_DIRS) for d in itertools.chain(chef_dirs, REQUIRED_CHEF_DIRS): util.ensure_dir(d) vkey_path = chef_cfg.get('validation_key', CHEF_VALIDATION_PEM_PATH) vcert = chef_cfg.get('validation_cert') # special value 'system' means do not overwrite the file # but still render the template to contain 'validation_key' if vcert: if vcert != "system": util.write_file(vkey_path, vcert) elif not os.path.isfile(vkey_path): log.warn("chef validation_cert provided as 'system', but " "validation_key path '%s' does not exist.", vkey_path) # Create the chef config from template template_fn = cloud.get_template_filename('chef_client.rb') if template_fn: iid = str(cloud.datasource.get_instance_id()) params = get_template_params(iid, chef_cfg, log) # Do a best effort attempt to ensure that the template values that # are associated with paths have there parent directory created # before they are used by the chef-client itself. param_paths = set() for (k, v) in params.items(): if k in CHEF_RB_TPL_PATH_KEYS and v: param_paths.add(os.path.dirname(v)) util.ensure_dirs(param_paths) templater.render_to_file(template_fn, CHEF_RB_PATH, params) else: log.warn("No template found, not rendering to %s", CHEF_RB_PATH) # Set the firstboot json fb_filename = util.get_cfg_option_str(chef_cfg, 'firstboot_path', default=CHEF_FB_PATH) if not fb_filename: log.info("First boot path empty, not writing first boot json file") else: initial_json = {} if 'run_list' in chef_cfg: initial_json['run_list'] = chef_cfg['run_list'] if 'initial_attributes' in chef_cfg: initial_attributes = chef_cfg['initial_attributes'] for k in list(initial_attributes.keys()): initial_json[k] = initial_attributes[k] util.write_file(fb_filename, json.dumps(initial_json)) # Try to install chef, if its not already installed... force_install = util.get_cfg_option_bool(chef_cfg, 'force_install', default=False) if not is_installed() or force_install: run = install_chef(cloud, chef_cfg, log) elif is_installed(): run = util.get_cfg_option_bool(chef_cfg, 'exec', default=False) else: run = False if run: run_chef(chef_cfg, log) post_run_chef(chef_cfg, log) def run_chef(chef_cfg, log): log.debug('Running chef-client') cmd = [CHEF_EXEC_PATH] if 'exec_arguments' in chef_cfg: cmd_args = chef_cfg['exec_arguments'] if isinstance(cmd_args, (list, tuple)): cmd.extend(cmd_args) elif isinstance(cmd_args, six.string_types): cmd.append(cmd_args) else: log.warn("Unknown type %s provided for chef" " 'exec_arguments' expected list, tuple," " or string", type(cmd_args)) cmd.extend(CHEF_EXEC_DEF_ARGS) else: cmd.extend(CHEF_EXEC_DEF_ARGS) util.subp(cmd, capture=False) def install_chef_from_omnibus(url=None, retries=None, omnibus_version=None): """Install an omnibus unified package from url. @param url: URL where blob of chef content may be downloaded. Defaults to OMNIBUS_URL. @param retries: Number of retries to perform when attempting to read url. Defaults to OMNIBUS_URL_RETRIES @param omnibus_version: Optional version string to require for omnibus install. """ if url is None: url = OMNIBUS_URL if retries is None: retries = OMNIBUS_URL_RETRIES if omnibus_version is None: args = [] else: args = ['-v', omnibus_version] content = url_helper.readurl(url=url, retries=retries).contents return util.subp_blob_in_tempfile( blob=content, args=args, basename='chef-omnibus-install', capture=False) def install_chef(cloud, chef_cfg, log): # If chef is not installed, we install chef based on 'install_type' install_type = util.get_cfg_option_str(chef_cfg, 'install_type', 'packages') run = util.get_cfg_option_bool(chef_cfg, 'exec', default=False) if install_type == "gems": # This will install and run the chef-client from gems chef_version = util.get_cfg_option_str(chef_cfg, 'version', None) ruby_version = util.get_cfg_option_str(chef_cfg, 'ruby_version', RUBY_VERSION_DEFAULT) install_chef_from_gems(ruby_version, chef_version, cloud.distro) # Retain backwards compat, by preferring True instead of False # when not provided/overriden... run = util.get_cfg_option_bool(chef_cfg, 'exec', default=True) elif install_type == 'packages': # This will install and run the chef-client from packages cloud.distro.install_packages(('chef',)) elif install_type == 'omnibus': omnibus_version = util.get_cfg_option_str(chef_cfg, "omnibus_version") install_chef_from_omnibus( url=util.get_cfg_option_str(chef_cfg, "omnibus_url"), retries=util.get_cfg_option_int(chef_cfg, "omnibus_url_retries"), omnibus_version=omnibus_version) else: log.warn("Unknown chef install type '%s'", install_type) run = False return run def get_ruby_packages(version): # return a list of packages needed to install ruby at version pkgs = ['ruby%s' % version, 'ruby%s-dev' % version] if version == "1.8": pkgs.extend(('libopenssl-ruby1.8', 'rubygems1.8')) return pkgs def install_chef_from_gems(ruby_version, chef_version, distro): distro.install_packages(get_ruby_packages(ruby_version)) if not os.path.exists('/usr/bin/gem'): util.sym_link('/usr/bin/gem%s' % ruby_version, '/usr/bin/gem') if not os.path.exists('/usr/bin/ruby'): util.sym_link('/usr/bin/ruby%s' % ruby_version, '/usr/bin/ruby') if chef_version: util.subp(['/usr/bin/gem', 'install', 'chef', '-v %s' % chef_version, '--no-ri', '--no-rdoc', '--bindir', '/usr/bin', '-q'], capture=False) else: util.subp(['/usr/bin/gem', 'install', 'chef', '--no-ri', '--no-rdoc', '--bindir', '/usr/bin', '-q'], capture=False) # vi: ts=4 expandtab