ELK Stack

LogStash :

1 install 

wget -O - http://packages.elasticsearch.org/GPG-KEY-elasticsearch | apt-key add -
cat >> /etc/apt/sources.list <<EOF
deb http://packages.elasticsearch.org/logstash/5.0/debian stable main
EOF
apt-get update
apt-get install logstash

　　

2 Hello World

# bin/logstash -e 'input{stdin{}}output{stdout{codec=>rubydebug}}'