启动 apache 组合日志过滤器的日志存储时出错。
配置文件：
input {
file {
path => "/u/agrawalo/logstash-5.4.0/event-data/apache_access.log"
start_position => "beginning"
}
http {
}
}
filter {
grok {
match => { "message" => "%{HTTPD_COMBINEDLOG}" }
}
}
output {
stdout {
codec => rubydebug
}
}
用于启动日志存储的命令：
bin/logstash -f config/pipelines/apacheauto.conf --config.reload.automatic
错误：
Sending Logstash's logs to /u/agrawalo/logstash-5.4.0/logs which is now configured via log4j2.properties
04:18:45.723 [[main]-pipeline-manager] ERROR logstash.pipeline - Error registering plugin {:plugin=>"#<LogStash::FilterDelegator:0x7bfa005e @id="498367beab653b0a3133b16fc4dcef59f08886de-3", @klass=LogStash::Filters::Grok, @metric_events=#<LogStash::Instrument::NamespacedMetric:0x684a02d @metric=#<LogStash::Instrument::Metric:0x68e13c68 @collector=#<LogStash::Instrument::Collector:0x7fe7de03 @agent=nil, @metric_store=#<LogStash::Instrument::MetricStore:0x5434c951 @store=#<Concurrent::Map:0x77929e32 @default_proc=nil>, @structured_lookup_mutex=#<Mutex:0x16f1fed4>, @fast_lookup=#<Concurrent::Map:0x57273dcf @default_proc=nil>>>>, @namespace_name=[:stats, :pipelines, :main, :plugins, :filters, :"498367beab653b0a3133b16fc4dcef59f08886de-3", :events]>, @logger=#<LogStash::Logging::Logger:0x462b61a2 @logger=#<Java::OrgApacheLoggingLog4jCore::Logger:0x4941bd9c>>, @filter=<LogStash::Filters::Grok match=>{"message"=>"%{HTTPD_COMBINEDLOG}"}, id=>"498367beab653b0a3133b16fc4dcef59f08886de-3", enable_metric=>true, periodic_flush=>false, patterns_files_glob=>"*", break_on_match=>true, named_captures_only=>true, keep_empty_captures=>false, tag_on_failure=>["_grokparsefailure"], timeout_millis=>30000, tag_on_timeout=>"_groktimeout">>", :error=>"pattern %{HTTPD_COMBINEDLOG} not defined"}
04:18:45.731 [[main]-pipeline-manager] ERROR logstash.agent - Pipeline aborted due to error {:exception=>#<Grok::PatternError: pattern %{HTTPD_COMBINEDLOG} not defined>, :backtrace=>["/u/agrawalo/logstash-5.4.0/vendor/bundle/jruby/1.9/gems/jls-grok-0.11.4/lib/grok-pure.rb:123:in `compile'", "org/jruby/RubyKernel.java:1479:in `loop'", "/u/agrawalo/logstash-5.4.0/vendor/bundle/jruby/1.9/gems/jls-grok-0.11.4/lib/grok-pure.rb:93:in `compile'", "/u/agrawalo/logstash-5.4.0/vendor/bundle/jruby/1.9/gems/logstash-filter-grok-3.3.1/lib/logstash/filters/grok.rb:274:in `register'", "org/jruby/RubyArray.java:1613:in `each'", "/u/agrawalo/logstash-5.4.0/vendor/bundle/jruby/1.9/gems/logstash-filter-grok-3.3.1/lib/logstash/filters/grok.rb:269:in `register'", "org/jruby/RubyHash.java:1342:in `each'", "/u/agrawalo/logstash-5.4.0/vendor/bundle/jruby/1.9/gems/logstash-filter-grok-3.3.1/lib/logstash/filters/grok.rb:264:in `register'", "/u/agrawalo/logstash-5.4.0/logstash-core/lib/logstash/pipeline.rb:268:in `register_plugin'", "/u/agrawalo/logstash-5.4.0/logstash-core/lib/logstash/pipeline.rb:279:in `register_plugins'", "org/jruby/RubyArray.java:1613:in `each'", "/u/agrawalo/logstash-5.4.0/logstash-core/lib/logstash/pipeline.rb:279:in `register_plugins'", "/u/agrawalo/logstash-5.4.0/logstash-core/lib/logstash/pipeline.rb:289:in `start_workers'", "/u/agrawalo/logstash-5.4.0/logstash-core/lib/logstash/pipeline.rb:214:in `run'", "/u/agrawalo/logstash-5.4.0/logstash-core/lib/logstash/agent.rb:398:in `start_pipeline'"]}
04:18:46.405 [Api Webserver] INFO logstash.agent - Successfully started Logstash API endpoint {:port=>9600}
logstash 安装目录上的"ls"命令输出
agrawalo@abc:~/logstash-5.4.0> ls
CHANGELOG.md CONTRIBUTORS Gemfile Gemfile.jruby-1.9.lock LICENSE NOTICE.TXT bin config data event-data lib logstash-core logstash-core-plugin-api output.txt vendor
经过进一步调试，我发现缺少httpd模式：
agrawalo@abc:~/logstash-5.4.0/vendor/bundle/jruby/1.9/gems/logstash-patterns-core-4.0.2/patterns> ls
aws bacula bro exim firewalls grok-patterns haproxy java junos linux-syslog mcollective mcollective-patterns mongodb nagios postgresql rails redis ruby
问：
为什么缺少这种模式？
如何在现有的 logstash 安装中包含或安装此模式？
我能够通过更新logstash的版本来解决此问题。