def get_instance_log_conf_file(instance_id):
"""
Args:
instance_id is an instance identifier.
Returns the Logentries-RSyslog configuration file deployed on the instance or None if the configuration does not exist or could not be retrieved.
"""
# Retrieve current log config file
log_conf_file = None
host_name='%s_%s'%(constants.get_group_name(), instance_id)
filename = 'logentries_%s.conf'%host_name
rsyslog_conf_name = '/etc/rsyslog.d/%s'%filename
local_conf_name = '/tmp/%s'%filename
# Remove local version of the file if already present as it may be obsolete
try:
local('rm %s'%local_conf_name, capture=True)
except:
logger.debug('No version of the file present locally. host_name=%s, remote_filename=%s, local_filename=%s', host_name, rsyslog_conf_name, local_conf_name)
# Get remote conf file or return None if it cannot be retrieved
if not files.exists(rsyslog_conf_name, use_sudo=True):
return None
try:
get(rsyslog_conf_name,local_conf_name)
except:
logger.debug('No version of the file present remotely. host_name=%s, remote_filename=%s, local_filename=%s', host_name, rsyslog_conf_name, local_conf_name)
return None
# Open conf file or return None if it cannot be opened
try:
log_conf_file = open(local_conf_name,'r')
except:
logger.error('Cannot open Logentries-Rsyslog configuration file. host_name=%s, local_filename=%s', host_name, local_conf_name)
return None
logger.debug('Remote Logentries-Rsyslog configuration file successfully retrieved and opened. filename=%s, hostname=%s', rsyslog_conf_name, host_name)
return log_conf_file
def deploy_log_conf(instance_id, log_conf):
"""
Args:
instance_id is an not None instance identifier.
log_conf is a Logentries-RSyslog configuration.
Deploys Logentries-RSyslog configuration file 'log_conf' and restart RSyslog so that this file is taken into account.
Returns True if and only if log_conf was successfully deployed and RSyslog was successfully restarted.
"""
host_name = '%s_%s'%(constants.get_group_name(), instance_id)
if log_conf is None:
logger.warning('No RSyslog Configuration file is provided. hostname=%s', host_name)
return False
# Get current instance information
local_conf_name = log_conf.get_name()
# Save configuration in a file
log_conf_file = log_conf.save()
filename = os.path.basename(log_conf_file.name)
log_conf_file.close()
remote_conf_name = '/etc/rsyslog.d/%s'%filename
try:
put(local_conf_name,remote_conf_name,use_sudo=True)
except:
logger.error('File could not be transfer to instance. local_filename=%s, remote_filename=%s, hostname=%s',local_conf_name, remote_conf_name, host_name)
return False
logger.debug('Configuration file successfully deployed. local_filename=%s, remote_filename=%s, hostanme=%s', local_conf_name, remote_conf_name, host_name)
return True
def remove_log_conf(instance_id):
"""
Args:
instance_id is an instance identifier.
Returns True if and only if the Logentries-RSyslog configuration file is no longer present on the remote the instance.
"""
host_name='%s_%s'%(constants.get_group_name(), instance_id)
remote_conf_filename = '/etc/rsyslog.d/logentries_%s.conf'%host_name
try:
# Remove logentries rsyslog conf file
command = 'rm %s'%remote_conf_filename
output = sudo(command, warn_only=True)
if output.succeeded:
logger.debug('File successfully removed. remote_filename=%s, hostname=%s.', remote_conf_filename, host_name)
else:
logger.warning('Could not remove file. remote_filename=%s, hostname=%s.', remote_conf_filename, host_name)
except:
logger.error('Could not remove file. remote_filename=%s, hostname=%s.', remote_conf_filename, host_name)
present = files.exists(remote_conf_filename)
if not present:
logger.debug('File is not present on the system. remote_filename=%s, hostname=%s.', remote_conf_filename, host_name)
return present
def get_instance_log_paths(instance_id, log_filter):
"""
Args:
instance_id is an instance identifier.
ssh_config is the ssh configuration associated to the instance with id 'instance_id'.
Returns the list of log paths for the instance with id 'instance_id'.
Returns an empty list if no log file paths could be retrieved from the instance.
"""
host_name = '%s_%s'%(constants.get_group_name(), instance_id)
log_paths = []
# Retrieve log file paths that match the log filter
command = "find / -type f -regex '%s'"%(log_filter)
try:
output = sudo(command, warn_only=True)
except:
logger.warning('Could not retrieve log paths. hostname=%s, log_filter=%s, command=%s', host_name, log_filter, command)
return []
if not output.succeeded:
logger.warning('Could not retrieve log paths. hostname=%s, log_filter=%s, message=%s', host_name, log_filter, output.stdout.replace('\n',' \\ '))
return log_paths
# Clean output
log_paths.extend([logpath.replace('\r','') for logpath in output.stdout.split('\n')])
logger.info('Log Paths: %s',log_paths)
return log_paths
def restart_rsyslog(instance_id):
"""
Restarts RSyslog service.
Args:
instance_id is an instance identifier.
Returns True if and only if RSyslog was successfully restarted.
"""
host_name = '%s_%s'%(constants.get_group_name(), instance_id)
output = None
if files.exists('/etc/rsyslog.d/', use_sudo=True):
command = 'service rsyslog restart'
try:
output = sudo(command, warn_only=True)
logger.warning('Could not restart syslog. hostname=%s, command=\'%s\'', host_name, command)
except:
command = '/etc/init.d/rsyslog restart'
try:
sudo(command, warn_only=True)
except:
logger.error('Rsyslog could not be restarted. hostname=%s, command=\'%s\'', host_name, command)
else:
logger.warning('Instance does not support RSyslog. hostname=%s', host_name)
return False
if output is None:
return False
if output.succeeded:
logger.info('RSyslog restarted successfully. hostname=%s', host_name)
else:
logger.error('Error restarting RSyslog. hostname=%s, message=%s', host_name, output.stdout)
return output.succeeded
def update_instance_conf(instance_id, log_paths, log_conf):
"""
Args:
instance_id is an instance identifier.
log_paths is a not None list of log file paths.
log_conf is a not None Logentries-RSyslog configuration object.
Returns the updated log_conf, taking into account new log files present on the instance as well as modifications made to the corresponding logentries host.
"""
log_client = logclient.Client(constants.ACCOUNT_KEY)
host_name = '%s_%s'%(constants.get_group_name(), instance_id)
# Creation of a host if no configuration file exists
if log_conf is None and len(log_paths)>0:
host = utils.create_host_and_logs(log_client,instance_id,log_paths)
log_conf = configfile.LoggingConfFile(name='logentries_%s.conf'%host.get_name(),host=host)
# if a configuration file exists for the instance, look for the differences between the log lists
elif log_conf is not None:
conf_host = log_conf.get_host()
if conf_host is None:
logger.error('This instance configuration is missing the corresponding model!! hostname=%s', host_name)
host = utils.create_host_and_logs(log_client,instance_id,log_paths)
log_conf = configfile.LoggingConfFile(name='logentries_%s.conf'%host.get_name(),host=host)
return log_conf
if conf_host.get_key() is None:
logger.warning('Instance has a logentries-rsyslog config file but no account key!! hostname=%s', host.get_name())
logger.warning('Instance is re-provisioned. hostname=%s', host.get_name())
host = utils.create_host_and_logs(log_client,instance_id,log_paths)
log_conf = configfile.LoggingConfFile(name='logentries_%s.conf'%host.get_name(),host=host)
return log_conf
logentries_host = get_logentries_host(log_client,conf_host)
# If there is no matching host, then it is assumed that it was deleted from Logentries and that no configuration should be associated to this instance.
if logentries_host is None:
logger.info('Instance has an logentries-rsyslog config file but no matching host in logentries!! hostname=%s', host_name)
logger.info('Instance will be deprovisioned hostname=%s', host_name)
#host = utils.create_host_and_logs(log_client,instance_id,log_paths)
#log_conf = configfile.LoggingConfFile(name='logentries_%s.conf'%host.get_name(),host=host)
return None
logentries_logs = logentries_host.get_logs()
logentries_log_paths = [log.get_filename() for log in logentries_logs]
logger.info('Logs are already followed on this instance. hostname=%s, log_paths=%s',log_conf.get_host().get_name(), logentries_log_paths)
new_log_paths = [log_path for log_path in log_paths if log_path not in logentries_log_paths]
logger.info('New logs detected. hostname=%s, new_log_paths=%s',log_conf.get_host().get_name(), new_log_paths)
for new_log_name in new_log_paths:
logentries_host, log_key = log_client.create_log_token(host=logentries_host, log_name=new_log_name)
logger.info('Log Created. hostname=%s, log_path=%s, key=%s', logentries_host.get_name(), new_log_name, log_key)
removed_logs = [removed_log for removed_log in logentries_logs if removed_log.get_filename() not in log_paths]
for removed_log in removed_logs:
if removed_log is not None and log_client.remove_log(host=logentries_host, log=removed_log):
logger.info('Log Removed. hostname=%s, log=%s', logentries_host.get_name(), removed_log)
log_conf.set_host(logentries_host)
return log_conf
def get_instance_log_conf(instance_id):
"""
Args:
instance_id is an not None instance identifier.
Returns the Logentries-RSyslog configuration deployed on the instance or None if no such configuration is deployed.
"""
host_name = '%s_%s'%(constants.get_group_name(), instance_id)
log_conf_file = get_instance_log_conf_file(instance_id)
if log_conf_file is None:
logger.debug('No existing logentries rsyslog configuration file was found. hostname=%s', host_name)
log_conf = load_conf_file(log_conf_file,instance_id)
if log_conf is None:
logger.info('Logentries rsyslog configuration file could not be read. hostname=%s', host_name)
return log_conf
def set_instance_host_keys():
"""
Args:
Collects host keys associated to instance in fabric host_list.
"""
instance_id, log_filter = utils.get_log_filter(env.host)
host_name = '%s_%s'%(constants.get_group_name(), instance_id)
log_client = logclient.Client(constants.get_account_key())
global _GROUP_HOST_LIST
log_conf = get_instance_log_conf(instance_id)
if log_conf is None:
return
conf_host = log_conf.get_host()
logger.debug('Checking if host should be kept. host=%s', conf_host)
if conf_host is not None:
logger.info('Host found in ssh configuration. host=%s', conf_host.to_json())
_GROUP_HOST_LIST.append(conf_host.get_key())
def deprovision():
"""
Deprovisions the instance by removing the logentries rsyslog config file from it, restarting rsyslog and removing the corresponding host from the logentries system.
"""
instance_id, log_filter = utils.get_log_filter(env.host)
host_name = '%s_%s'%(constants.get_group_name(), instance_id)
log_conf_file = get_instance_log_conf_file(instance_id)
if log_conf_file is None:
logger.debug('Cannot deprovision instance as it has not been provisioned. hostname=%s', host_name)
return
log_conf = load_conf_file(log_conf_file, instance_id)
if log_conf is None:
logger.info('No existing logentries rsyslog configuration file was found on instance %s',instance_id)
return
if remove_log_conf(instance_id):
restart_rsyslog(instance_id)
conf_host = log_conf.get_host()
if conf_host is None:
logger.error('Error. This instance configuration is missing the corresponding model!! instance_id=%s',instance_id)
return
if conf_host.get_key() is None:
logger.error('Host has a logentries-rsyslog config file but no account key, host=%s!!',host.to_json())
else:
log_client = logclient.Client(constants.get_account_key())
logentries_host = get_logentries_host(log_client,conf_host)
# If there is no matching host, then it is assumed that it was deleted from Logentries and that no configuration should be associated to this instance.
if logentries_host is not None:
succeeded = log_client.remove_host(logentries_host)
if succeeded:
logger.warning('Host removed from Logentries. host=%s', logentries_host.to_json())
else:
logger.error('Could not remove host from Logentries. host=%s', logentries_host.to_json())
else:
logger.error('Could not remove host from Logentries. hostname=%s', host_name)
return
def sync():
"""
Syncs the logentries account with each instance and logs defined in the ssh config file.
"""
# Get current instance information
instance_id, log_filter = utils.get_log_filter(env.host)
host_name = '%s_%s'%(constants.get_group_name(), instance_id)
log_paths = get_instance_log_paths(instance_id, log_filter)
if not files.exists('/etc/rsyslog.d/', use_sudo=True):
logger.info('Instance does not support rsyslog. hostname=%s', host_name)
return
log_conf = get_instance_log_conf(instance_id)
log_conf = update_instance_conf(instance_id, log_paths, log_conf)
if log_conf is None:
logger.info('No new rsyslog configuration was detected. hostname=%s', host_name)
return
deploy_log_conf(instance_id, log_conf)
# Restart RSyslog
restart_rsyslog(instance_id)
return
