Mercurial > logstash

annotate logstash_index_cleaner.py @ 3:796ac0b50dbf

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add cron.daily index cleaning
author Carl Byington <carl@five-ten-sg.com>
date Thu, 07 Mar 2013 10:41:01 -0800
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1 #!/usr/bin/env python
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2 #
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3 # Deletes all indices with a datestamp older than "days-to-keep" for daily
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4 # if you have hourly indices, it will delete all of those older than "hours-to-keep"
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5 #
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6 # This script presumes an index is named typically, e.g. logstash-YYYY.MM.DD
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7 # It will work with any name-YYYY.MM.DD or name-YYYY.MM.DD.HH type sequence
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8 #
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9 # Requires python and the following dependencies (all pip/easy_installable):
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10 #
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11 # pyes (python elasticsearch bindings, which might need simplejson)
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12 # argparse (built-in in python2.7 and higher, python 2.6 and lower will have to easy_install it)
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13 #
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14 # TODO: Proper logging instead of just print statements, being able to configure a decent logging level.
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15 # Unit tests. The code is somewhat broken up into logical parts that may be tested separately.
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16 # Better error reporting?
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17 # Improve the get_index_epoch method to parse more date formats. Consider renaming (to "parse_date_to_timestamp"?)
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18
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19 import sys
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20 import time
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21 import argparse
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22 from datetime import timedelta
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23
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24 import pyes
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25
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26
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27 __version__ = '0.1.2'
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28
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29
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30 def make_parser():
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31 """ Creates an ArgumentParser to parse the command line options. """
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32 parser = argparse.ArgumentParser(description='Delete old logstash indices from Elasticsearch.')
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33
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34 parser.add_argument('-v', '--version', action='version', version='%(prog)s '+__version__)
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35
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36 parser.add_argument('--host', help='Elasticsearch host.', default='localhost')
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37 parser.add_argument('--port', help='Elasticsearch port', default=9200, type=int)
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38 parser.add_argument('-t', '--timeout', help='Elasticsearch timeout', default=30, type=int)
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39
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40 parser.add_argument('-p', '--prefix', help='Prefix for the indices. Indices that do not have this prefix are skipped.', default='logstash-')
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41 parser.add_argument('-s', '--separator', help='Time unit separator', default='.')
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42
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43 parser.add_argument('-H', '--hours-to-keep', action='store', help='Number of hours to keep.', type=int)
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44 parser.add_argument('-d', '--days-to-keep', action='store', help='Number of days to keep.', type=int)
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45 parser.add_argument('-g', '--disk-space-to-keep', action='store', help='Disk space to keep (GB).', type=float)
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46
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47 parser.add_argument('-n', '--dry-run', action='store_true', help='If true, does not perform any changes to the Elasticsearch indices.', default=False)
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48
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49 return parser
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50
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51
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52 def get_index_epoch(index_timestamp, separator='.'):
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53 """ Gets the epoch of the index.
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54
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55 :param index_timestamp: A string on the format YYYY.MM.DD[.HH]
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56 :return The creation time (epoch) of the index.
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57 """
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58 year_month_day_optionalhour = index_timestamp.split(separator)
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59 if len(year_month_day_optionalhour) == 3:
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60 year_month_day_optionalhour.append('3')
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61
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62 return time.mktime([int(part) for part in year_month_day_optionalhour] + [0,0,0,0,0])
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63
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64
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65 def find_expired_indices(connection, days_to_keep=None, hours_to_keep=None, separator='.', prefix='logstash-', out=sys.stdout, err=sys.stderr):
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66 """ Generator that yields expired indices.
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67
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68 :return: Yields tuples on the format ``(index_name, expired_by)`` where index_name
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69 is the name of the expired index and expired_by is the number of seconds (a float value) that the
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70 index was expired by.
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71 """
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72 utc_now_time = time.time() + time.altzone
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73 days_cutoff = utc_now_time - days_to_keep * 24 * 60 * 60 if days_to_keep is not None else None
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74 hours_cutoff = utc_now_time - hours_to_keep * 60 * 60 if hours_to_keep is not None else None
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75
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76 for index_name in sorted(set(connection.get_indices().keys())):
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77 if not index_name.startswith(prefix):
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78 print >> out, 'Skipping index due to missing prefix {0}: {1}'.format(prefix, index_name)
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79 continue
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80
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81 unprefixed_index_name = index_name[len(prefix):]
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82
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83 # find the timestamp parts (i.e ['2011', '01', '05'] from '2011.01.05') using the configured separator
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84 parts = unprefixed_index_name.split(separator)
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85
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86 # perform some basic validation
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87 if len(parts) < 3 or len(parts) > 4 or not all([item.isdigit() for item in parts]):
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88 print >> err, 'Could not find a valid timestamp from the index: {0}'.format(index_name)
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89 continue
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90
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91 # find the cutoff. if we have more than 3 parts in the timestamp, the timestamp includes the hours and we
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92 # should compare it to the hours_cutoff, otherwise, we should use the days_cutoff
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93 cutoff = hours_cutoff
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94 if len(parts) == 3:
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95 cutoff = days_cutoff
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96
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97 # but the cutoff might be none, if the current index only has three parts (year.month.day) and we're only
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98 # removing hourly indices:
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99 if cutoff is None:
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100 print >> out, 'Skipping {0} because it is of a type (hourly or daily) that I\'m not asked to delete.'.format(index_name)
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101 continue
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102
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103 index_epoch = get_index_epoch(unprefixed_index_name)
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104
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105 # if the index is older than the cutoff
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106 if index_epoch < cutoff:
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107 yield index_name, cutoff-index_epoch
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108
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109 else:
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110 print >> out, '{0} is {1} above the cutoff.'.format(index_name, timedelta(seconds=index_epoch-cutoff))
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111
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112 def find_overusage_indices(connection, disk_space_to_keep, separator='.', prefix='logstash-', out=sys.stdout, err=sys.stderr):
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113 """ Generator that yields over usage indices.
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114
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115 :return: Yields tuples on the format ``(index_name, 0)`` where index_name
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116 is the name of the expired index. The second element is only here for
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117 compatiblity reasons.
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118 """
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119
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120 disk_usage = 0.0
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121 disk_limit = disk_space_to_keep * 2**30
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122
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123 for index_name in reversed(sorted(set(connection.get_indices().keys()))):
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124
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125 if not index_name.startswith(prefix):
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126 print >> out, 'Skipping index due to missing prefix {0}: {1}'.format(prefix, index_name)
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127 continue
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128
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129 index_size = connection.status(index_name).get('indices').get(index_name).get('index').get('primary_size_in_bytes')
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130 disk_usage += index_size
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131
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132 if disk_usage > disk_limit:
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133 yield index_name, 0
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134 else:
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135 print >> out, 'keeping {0}, disk usage is {1:.3f} GB and disk limit is {2:.3f} GB.'.format(index_name, disk_usage/2**30, disk_limit/2**30)
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136
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137 def main():
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138 start = time.time()
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139
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140 parser = make_parser()
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141 arguments = parser.parse_args()
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142
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143 if not arguments.hours_to_keep and not arguments.days_to_keep and not arguments.disk_space_to_keep:
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144 print >> sys.stderr, 'Invalid arguments: You must specify either the number of hours, the number of days to keep or the maximum disk space to use'
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145 parser.print_help()
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146 return
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147
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148 connection = pyes.ES('{0}:{1}'.format(arguments.host, arguments.port), timeout=arguments.timeout)
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149
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150 if arguments.days_to_keep:
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151 print 'Deleting daily indices older than {0} days.'.format(arguments.days_to_keep)
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152 expired_indices = find_expired_indices(connection, arguments.days_to_keep, arguments.hours_to_keep, arguments.separator, arguments.prefix)
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153 if arguments.hours_to_keep:
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154 print 'Deleting hourly indices older than {0} hours.'.format(arguments.hours_to_keep)
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155 expired_indices = find_expired_indices(connection, arguments.days_to_keep, arguments.hours_to_keep, arguments.separator, arguments.prefix)
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156 if arguments.disk_space_to_keep:
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157 print 'Let\'s keep disk usage lower than {} GB.'.format(arguments.disk_space_to_keep)
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158 expired_indices = find_overusage_indices(connection, arguments.disk_space_to_keep, arguments.separator, arguments.prefix)
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159
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160 print ''
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161
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162 for index_name, expired_by in expired_indices:
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163 expiration = timedelta(seconds=expired_by)
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164
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165 if arguments.dry_run:
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166 print 'Would have attempted deleting index {0} because it is {1} older than the calculated cutoff.'.format(index_name, expiration)
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167 continue
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168
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169 print 'Deleting index {0} because it was {1} older than cutoff.'.format(index_name, expiration)
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170
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171 deletion = connection.delete_index_if_exists(index_name)
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172 # ES returns a dict on the format {u'acknowledged': True, u'ok': True} on success.
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173 if deletion.get('ok'):
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174 print 'Successfully deleted index: {0}'.format(index_name)
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175 else:
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176 print 'Error deleting index: {0}. ({1})'.format(index_name, deletion)
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177
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178 print ''
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179 print 'Done in {0}.'.format(timedelta(seconds=time.time()-start))
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180
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181
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182 if __name__ == '__main__':
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183 main()