├── .gitignore ├── .travis.yml ├── Gemfile ├── LICENSE ├── README.md ├── Rakefile ├── fluent-plugin-kubernetes-log-level.gemspec ├── lib └── fluent │ └── plugin │ └── filter_kubernetes_log_level.rb └── test ├── helper.rb └── plugin └── test_filter_kubernetes_log_level.rb /.gitignore: -------------------------------------------------------------------------------- 1 | /.bundle/ 2 | /vendor/bundle 3 | Gemfile.lock 4 | .ruby-version 5 | .ruby-gemset 6 | *.gem 7 | -------------------------------------------------------------------------------- /.travis.yml: -------------------------------------------------------------------------------- 1 | language: ruby 2 | rvm: 3 | - 2.2 4 | deploy: 5 | provider: rubygems 6 | api_key: 7 | secure: 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 8 | gem: fluent-plugin-kubernetes-log-level 9 | gemspec: fluent-plugin-kubernetes-log-level.gemspec 10 | on: 11 | tags: true 12 | repo: Soluto/fluent-plugin-kubernetes-log-level 13 | -------------------------------------------------------------------------------- /Gemfile: -------------------------------------------------------------------------------- 1 | source "https://rubygems.org" 2 | 3 | gemspec 4 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | 2 | Apache License 3 | Version 2.0, January 2004 4 | http://www.apache.org/licenses/ 5 | 6 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 7 | 8 | 1. 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We also recommend that a 186 | file or class name and description of purpose be included on the 187 | same "printed page" as the copyright notice for easier 188 | identification within third-party archives. 189 | 190 | Copyright [yyyy] [name of copyright owner] 191 | 192 | Licensed under the Apache License, Version 2.0 (the "License"); 193 | you may not use this file except in compliance with the License. 194 | You may obtain a copy of the License at 195 | 196 | http://www.apache.org/licenses/LICENSE-2.0 197 | 198 | Unless required by applicable law or agreed to in writing, software 199 | distributed under the License is distributed on an "AS IS" BASIS, 200 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 201 | See the License for the specific language governing permissions and 202 | limitations under the License. 203 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | [![Build Status](https://travis-ci.com/Soluto/fluent-plugin-kubernetes-log-level.svg?branch=master)](https://travis-ci.com/Soluto/fluent-plugin-kubernetes-log-level) 2 | 3 | # fluent-plugin-kubernetes-log-level 4 | 5 | [Fluentd](https://fluentd.org/) filter plugin to filter messages according to log level 6 | 7 | This plugin allows setting a kubernetes label to your pods, and have fluentd filter logs containing a level value lower then the level indicated by the label. 8 | 9 | ## Installation 10 | 11 | ### RubyGems 12 | 13 | ``` 14 | $ gem install fluent-plugin-kubernetes-log-level 15 | ``` 16 | 17 | ### Bundler 18 | 19 | Add following line to your Gemfile: 20 | 21 | ```ruby 22 | gem "fluent-plugin-kubernetes-log-level" 23 | ``` 24 | 25 | And then execute: 26 | 27 | ``` 28 | $ bundle 29 | ``` 30 | 31 | ## Configuration 32 | 33 | Configuration options for fluent.conf are: 34 | 35 | * `log_level_label` - kubernetes label name for setting current log level 36 | * `log_level_key_label` - kubernetes label name for getting current log level from record 37 | * `default_log_level_key` - default key in log record to indicate the current record's level 38 | * `default_logging_level` - default logging levels for kubernetes services missing a `log_level_label` 39 | 40 | ## Copyright 41 | 42 | * Copyright(c) 2018 - Soluto 43 | * License 44 | * Apache License, Version 2.0 45 | 46 | -------------------------------------------------------------------------------- /Rakefile: -------------------------------------------------------------------------------- 1 | require "bundler" 2 | Bundler::GemHelper.install_tasks 3 | 4 | require "rake/testtask" 5 | 6 | Rake::TestTask.new(:test) do |t| 7 | t.libs.push("lib", "test") 8 | t.test_files = FileList["test/**/test_*.rb"] 9 | t.verbose = true 10 | t.warning = true 11 | end 12 | 13 | task default: [:test] 14 | -------------------------------------------------------------------------------- /fluent-plugin-kubernetes-log-level.gemspec: -------------------------------------------------------------------------------- 1 | lib = File.expand_path("../lib", __FILE__) 2 | $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib) 3 | 4 | Gem::Specification.new do |spec| 5 | spec.name = "fluent-plugin-kubernetes-log-level" 6 | spec.version = "0.2.4" 7 | spec.authors = ["yaron-idan"] 8 | spec.email = ["yaronidan@gmail.com"] 9 | 10 | spec.summary = %q{Fluentd plugin for setting kubernetes log level.} 11 | spec.description = %q{Use kubernetes labels to set log level dynamically.} 12 | spec.homepage = "https://github.com/Soluto/fluent-plugin-kubernetes-log-level" 13 | spec.license = "Apache-2.0" 14 | 15 | test_files, files = `git ls-files -z`.split("\x0").partition do |f| 16 | f.match(%r{^(test|spec|features)/}) 17 | end 18 | spec.files = files 19 | spec.executables = files.grep(%r{^bin/}) { |f| File.basename(f) } 20 | spec.test_files = test_files 21 | spec.require_paths = ["lib"] 22 | 23 | spec.add_development_dependency "bundler", "~> 1.14" 24 | spec.add_development_dependency "rake", "~> 12.0" 25 | spec.add_development_dependency "test-unit", "~> 3.0" 26 | spec.add_runtime_dependency "fluentd", [">= 0.14.10", "< 2"] 27 | end 28 | -------------------------------------------------------------------------------- /lib/fluent/plugin/filter_kubernetes_log_level.rb: -------------------------------------------------------------------------------- 1 | # 2 | # Copyright 2018- yaron-idan 3 | # 4 | # Licensed under the Apache License, Version 2.0 (the "License"); 5 | # you may not use this file except in compliance with the License. 6 | # You may obtain a copy of the License at 7 | # 8 | # http://www.apache.org/licenses/LICENSE-2.0 9 | # 10 | # Unless required by applicable law or agreed to in writing, software 11 | # distributed under the License is distributed on an "AS IS" BASIS, 12 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | # See the License for the specific language governing permissions and 14 | # limitations under the License. 15 | 16 | require "fluent/plugin/filter" 17 | 18 | module Fluent 19 | module Plugin 20 | class KubernetesLogLevelFilter < Fluent::Plugin::Filter 21 | Fluent::Plugin.register_filter("kubernetes_log_level", self) 22 | 23 | config_param :log_level_label, :string, :default => 'logging-level' 24 | config_param :log_level_key_label, :string, :default => 'logging-level-key' 25 | config_param :default_log_level_key, :string, :default => 'level' 26 | config_param :default_logging_level, :string, :default => '' 27 | 28 | def configure(conf) 29 | super 30 | end 31 | 32 | def level_to_num(level) 33 | if not level.is_a? String 34 | return level.to_i 35 | end 36 | 37 | case level.downcase 38 | when 'trace', 'verbose' 39 | 10 40 | when 'debug' 41 | 20 42 | when 'info', 'information' 43 | 30 44 | when 'warning', 'warn' 45 | 40 46 | when 'error' 47 | 50 48 | when 'fatal' 49 | 60 50 | else 51 | level.to_i 52 | end 53 | end 54 | 55 | def filter(tag, time, record) 56 | 57 | log.trace "Start to process record" 58 | 59 | log_level_key = @default_log_level_key 60 | logging_level = @default_logging_level 61 | app = 'app' 62 | 63 | if record.has_key?("kubernetes") 64 | if record["kubernetes"].has_key?("labels") 65 | if record["kubernetes"]["labels"].has_key?('app') 66 | app = record['kubernetes']['labels']['app'] 67 | end 68 | 69 | if record["kubernetes"]["labels"].has_key?(@log_level_key_label) 70 | log_level_key = record['kubernetes']['labels'][@log_level_key_label] 71 | log.debug "[App: #{app}]: kubernetes.labels.#{@log_level_key_label} found with the value #{log_level_key}" 72 | end 73 | 74 | if record["kubernetes"]["labels"].has_key?(@log_level_label) 75 | logging_level = record['kubernetes']['labels'][@log_level_label] 76 | log.debug "[App: #{app}]: kubernetes.labels.#{@log_level_label} found with the value #{logging_level}" 77 | end 78 | end 79 | end 80 | 81 | numeric_logging_level = level_to_num(logging_level) 82 | 83 | log.trace "Process current log level" 84 | 85 | if record.has_key?(log_level_key.capitalize) 86 | log.debug "[App: #{app}]: Downcasing capitalized log_level from #{log_level_key.capitalize}" 87 | current_log_level = record[log_level_key.capitalize] 88 | elsif record.has_key?(log_level_key) 89 | current_log_level = record[log_level_key] 90 | else 91 | log.warn "[App: #{app}]: log level key #{log_level_key} not found in record" 92 | return nil 93 | end 94 | 95 | numeric_level = level_to_num(current_log_level) 96 | if numeric_level >= numeric_logging_level 97 | log.debug "[App: #{app}]: Emitting record with #{current_log_level} level" 98 | record 99 | else 100 | log.debug "[App: #{app}]: Dropping record with #{current_log_level} level" 101 | nil 102 | end 103 | end 104 | end 105 | end 106 | end 107 | -------------------------------------------------------------------------------- /test/helper.rb: -------------------------------------------------------------------------------- 1 | $LOAD_PATH.unshift(File.expand_path("../../", __FILE__)) 2 | require "test-unit" 3 | require "fluent/test" 4 | require "fluent/test/driver/filter" 5 | require "fluent/test/helpers" 6 | 7 | Test::Unit::TestCase.include(Fluent::Test::Helpers) 8 | Test::Unit::TestCase.extend(Fluent::Test::Helpers) 9 | -------------------------------------------------------------------------------- /test/plugin/test_filter_kubernetes_log_level.rb: -------------------------------------------------------------------------------- 1 | require "helper" 2 | require "fluent/plugin/filter_kubernetes_log_level.rb" 3 | 4 | class KubernetesLogLevelFilterTest < Test::Unit::TestCase 5 | setup do 6 | Fluent::Test.setup 7 | @expected_warning = [{ 8 | 'level' => 'warning', 9 | 'kubernetes' => { 10 | 'labels' => { 11 | 'logging-level' => 'warning', 12 | 'app' => 'demo' 13 | } 14 | } 15 | }] 16 | 17 | @expected_error = [{ 18 | 'level' => 'error', 19 | 'kubernetes' => { 20 | 'labels' => { 21 | 'logging-level' => 'warning', 22 | 'app' => 'demo' 23 | } 24 | } 25 | }] 26 | 27 | @expected_info = [] 28 | 29 | @expected_static_warning_default = [{ 30 | 'level' => 'warning', 31 | 'kubernetes' => { 32 | 'labels' => { 33 | 'app' => 'demo' 34 | } 35 | } 36 | }] 37 | 38 | 39 | @expected_static_capital_level = [{ 40 | 'Level' => 'Warning', 41 | 'kubernetes' => { 42 | 'labels' => { 43 | 'app' => 'demo' 44 | } 45 | } 46 | }] 47 | 48 | @expected_warning_serilog = [{ 49 | 'level' => 'Warning', 50 | 'kubernetes' => { 51 | 'labels' => { 52 | 'logging-level' => 'Warning', 53 | 'app' => 'demo' 54 | } 55 | } 56 | }] 57 | 58 | @expected_no_default_log_level = [{ 59 | 'level' => 'error', 60 | 'kubernetes' => { 61 | 'labels' => { 62 | 'app' => 'demo' 63 | } 64 | } 65 | }] 66 | 67 | @expected_log_level_key = [{ 68 | 'levelname' => 'error', 69 | 'kubernetes' => { 70 | 'labels' => { 71 | 'logging-level-key' => 'levelname', 72 | 'app' => 'demo' 73 | } 74 | } 75 | }] 76 | 77 | @missing_log_level_key = [] 78 | 79 | @expected_numeric = [{ 80 | 'level' => 50, 81 | 'kubernetes' => { 82 | 'labels' => { 83 | 'app' => 'demo' 84 | } 85 | } 86 | }] 87 | 88 | @expected_capitialized = [{ 89 | 'Level' => 'Error', 90 | 'kubernetes' => { 91 | 'labels' => { 92 | 'app' => 'demo', 93 | 'logging-level'=>'Warning', 94 | 'logging-level-key'=>'level' 95 | } 96 | } 97 | }] 98 | end 99 | 100 | CONFIG = %[ 101 | default_logging_level warning 102 | ] 103 | 104 | # private 105 | 106 | def create_driver(conf = CONFIG) 107 | Fluent::Test::Driver::Filter.new(Fluent::Plugin::KubernetesLogLevelFilter).configure(conf) 108 | end 109 | 110 | def filter(msg, conf = CONFIG, time = event_time("2017-07-12 19:20:21 UTC")) 111 | d = create_driver(conf) 112 | d.run { d.feed('kubernetes', time, msg) } 113 | d.filtered_records 114 | end 115 | 116 | def test_default_configuration 117 | conf = %[ 118 | log_level_label logging-level 119 | log_level_key_label logging-level-key 120 | default_log_level_key level 121 | default_logging_level warning 122 | ] 123 | 124 | d = create_driver(conf) 125 | assert_equal 'logging-level', d.instance.config['log_level_label'] 126 | assert_equal 'logging-level-key', d.instance.config['log_level_key_label'] 127 | assert_equal 'level', d.instance.config['default_log_level_key'] 128 | assert_equal 'warning', d.instance.config['default_logging_level'] 129 | end 130 | 131 | def test_log_level_higher_then_threshold 132 | assert_equal @expected_error, filter({"level"=>"error", "kubernetes"=>{"labels"=>{"logging-level"=>"warning","app"=>"demo"}}}) 133 | end 134 | 135 | def test_log_level_equal_to_threshold 136 | assert_equal @expected_warning, filter({"level"=>"warning", "kubernetes"=>{"labels"=>{"logging-level"=>"warning","app"=>"demo"}}}) 137 | end 138 | 139 | def test_log_level_lower_then_threshold 140 | assert_equal @expected_info, filter({"level"=>"info", "kubernetes"=>{"labels"=>{"logging-level"=>"warning","app"=>"demo"}}}) 141 | end 142 | 143 | def test_static_log 144 | assert_equal @expected_static_warning_default, filter({"level"=>"warning", "kubernetes"=>{"labels"=>{"app"=>"demo"}}}) 145 | end 146 | 147 | def test_serilog_structure 148 | assert_equal @expected_static_capital_level, filter({"Level"=>"Warning", "kubernetes"=>{"labels"=>{"app"=>"demo"}}}) 149 | end 150 | 151 | def test_no_default_log_level 152 | conf = %[] 153 | assert_equal @expected_no_default_log_level, filter({"level"=>"error", "kubernetes"=>{"labels"=>{"app"=>"demo"}}}, conf) 154 | end 155 | 156 | def test_custom_log_level 157 | assert_equal @expected_log_level_key, filter({"levelname"=>"error", "kubernetes"=>{"labels"=>{"logging-level-key"=>"levelname","app"=>"demo"}}}) 158 | end 159 | 160 | def test_numeric_log_level 161 | assert_equal @expected_info, filter({"level"=>30, "kubernetes"=>{"labels"=>{"app"=>"demo"}}}) 162 | assert_equal @expected_numeric, filter({"level"=>50, "kubernetes"=>{"labels"=>{"app"=>"demo"}}}) 163 | end 164 | 165 | def test_missing_log_level 166 | assert_equal @missing_log_level_key, filter({"kubernetes"=>{"labels"=>{"app"=>"demo", "logging-level-key"=>"levelname", "logging-level"=>"Warning"}}}) 167 | end 168 | 169 | def test_capitialize_log_level 170 | assert_equal @expected_capitialized, filter({"Level"=>"Error", "kubernetes"=>{"labels"=>{"app"=>"demo", "logging-level-key"=>"level", "logging-level"=>"Warning"}}}) 171 | end 172 | end 173 | --------------------------------------------------------------------------------