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安裝神交過濾器logstash嘗試下面的命令無法在Mac
gem install logstash-filter-grok
ERROR: Could not find a valid gem 'logstash-core' (< 3.0.0, >= 2.0.0.beta2) in any repository
ERROR: Possible alternatives: logstash-cli, logstasher, logstash-file, logstash-lite, logstash-logger