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# vi: ts=4 expandtab syntax=python
#
# Copyright (C) 2009-2010 Canonical Ltd.
# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3, as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
rsyslog module allows configuration of syslog logging via rsyslog
Configuration is done under the cloud-config top level 'rsyslog'.
Under 'rsyslog' you can define:
- configs: [default=[]]
this is a list. entries in it are a string or a dictionary.
each entry has 2 parts:
* content
* filename
if the entry is a string, then it is assigned to 'content'.
for each entry, content is written to the provided filename.
if filename is not provided, its default is read from 'config_filename'
Content here can be any valid rsyslog configuration. No format
specific format is enforced.
For simply logging to an existing remote syslog server, via udp:
configs: ["*.* @192.168.1.1"]
- config_filename: [default=20-cloud-config.conf]
this is the file name to use if none is provided in a config entry.
- config_dir: [default=/etc/rsyslog.d]
this directory is used for filenames that are not absolute paths.
- service_reload_command: [default="auto"]
this command is executed if files have been written and thus the syslog
daemon needs to be told.
Note, since cloud-init 0.5 a legacy version of rsyslog config has been
present and is still supported. See below for the mappings between old
value and new value:
old value -> new value
'rsyslog' -> rsyslog/configs
'rsyslog_filename' -> rsyslog/config_filename
'rsyslog_dir' -> rsyslog/config_dir
the legacy config does not support 'service_reload_command'.
Example config:
#cloud-config
rsyslog:
configs:
- "*.* @@192.158.1.1"
- content: "*.* @@192.0.2.1:10514"
- filename: 01-examplecom.conf
- content: |
*.* @@syslogd.example.com
config_dir: config_dir
config_filename: config_filename
service_reload_command: [your, syslog, restart, command]
Example Legacy config:
#cloud-config
rsyslog:
- "*.* @@192.158.1.1"
rsyslog_dir: /etc/rsyslog-config.d/
rsyslog_filename: 99-local.conf
"""
import os
import six
from cloudinit import log as logging
from cloudinit import util
DEF_FILENAME = "20-cloud-config.conf"
DEF_DIR = "/etc/rsyslog.d"
DEF_RELOAD = "auto"
KEYNAME_CONFIGS = 'configs'
KEYNAME_FILENAME = 'config_filename'
KEYNAME_DIR = 'config_dir'
KEYNAME_RELOAD = 'service_reload_command'
KEYNAME_LEGACY_FILENAME = 'rsyslog_filename'
KEYNAME_LEGACY_DIR = 'rsyslog_dir'
LOG = logging.getLogger(__name__)
def reload_syslog(command=DEF_RELOAD, systemd=False):
service = 'rsyslog'
if command == DEF_RELOAD:
if systemd:
cmd = ['systemctl', 'reload-or-try-restart', service]
else:
cmd = ['service', service, 'restart']
else:
cmd = command
util.subp(cmd, capture=True)
def load_config(cfg):
# return an updated config with entries of the correct type
# support converting the old top level format into new format
mycfg = cfg.get('rsyslog', {})
if isinstance(cfg.get('rsyslog'), list):
mycfg = {KEYNAME_CONFIGS: cfg.get('rsyslog')}
if KEYNAME_LEGACY_FILENAME in cfg:
mycfg[KEYNAME_FILENAME] = cfg[KEYNAME_LEGACY_FILENAME]
if KEYNAME_LEGACY_DIR in cfg:
mycfg[KEYNAME_DIR] = cfg[KEYNAME_LEGACY_DIR]
fillup = (
(KEYNAME_CONFIGS, [], list),
(KEYNAME_DIR, DEF_DIR, six.string_types),
(KEYNAME_FILENAME, DEF_FILENAME, six.string_types),
(KEYNAME_RELOAD, DEF_RELOAD, six.string_types + (list,)))
for key, default, vtypes in fillup:
if key not in mycfg or not isinstance(mycfg[key], vtypes):
mycfg[key] = default
return mycfg
def apply_rsyslog_changes(configs, def_fname, cfg_dir):
# apply the changes in 'configs' to the paths in def_fname and cfg_dir
# return a list of the files changed
files = []
for cur_pos, ent in enumerate(configs):
if isinstance(ent, dict):
if "content" not in ent:
LOG.warn("No 'content' entry in config entry %s", cur_pos + 1)
continue
content = ent['content']
filename = ent.get("filename", def_fname)
else:
content = ent
filename = def_fname
filename = filename.strip()
if not filename:
LOG.warn("Entry %s has an empty filename", cur_pos + 1)
continue
if not filename.startswith("/"):
filename = os.path.join(cfg_dir, filename)
# Truncate filename first time you see it
omode = "ab"
if filename not in files:
omode = "wb"
files.append(filename)
try:
contents = "%s\n" % (content)
util.write_file(filename, contents, omode=omode)
except Exception:
util.logexc(LOG, "Failed to write to %s", filename)
return files
def handle(name, cfg, cloud, log, _args):
if 'rsyslog' not in cfg:
log.debug(("Skipping module named %s,"
" no 'rsyslog' key in configuration"), name)
return
mycfg = load_config(cfg)
if not mycfg['configs']:
log.debug("Empty config rsyslog['configs'], nothing to do")
return
changes = apply_rsyslog_changes(
configs=mycfg[KEYNAME_CONFIGS],
def_fname=mycfg[KEYNAME_FILENAME],
cfg_dir=mycfg[KEYNAME_DIR])
if not changes:
log.debug("restart of syslog not necessary, no changes made")
return
try:
restarted = reload_syslog(
command=mycfg[KEYNAME_RELOAD],
systemd=cloud.distro.uses_systemd()),
except util.ProcessExecutionError as e:
restarted = False
log.warn("Failed to reload syslog", e)
if restarted:
# This only needs to run if we *actually* restarted
# syslog above.
cloud.cycle_logging()
# This should now use rsyslog if
# the logging was setup to use it...
log.debug("%s configured %s files", name, changes)
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