CentOS 7
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Elastic Stack 6 : Install Logstash
2018/02/12
 
Install Logstash which collects or manages various logs.
For description of Logstash or how to write the setting file, refer to official site below.
⇒ https://www.elastic.co/guide/en/logstash/current/index.html
[1] Install Logstash. Configure Repository for Elasticsearch before it like here.
[root@dlp ~]#
yum -y install logstash
[2] Create a setting file and start Logstash.
For example, create a setting that Logstash collects sshd fail logs from [/var/log/secure].
[root@dlp ~]#
vi /etc/logstash/conf.d/sshd.conf
# create new

# extract sshd fail logs from [/var/log/secure] and output to index [sshd_fail-yyyy.mm] in elasticsearch

input {
  file {
    type => "seucure_log"
    path => "/var/log/secure"
  }
}
filter {
  grok {
    add_tag => [ "sshd_fail" ]
    match => { "message" => "Failed %{WORD:sshd_auth_type} for %{USERNAME:sshd_invalid_user} from %{IP:sshd_client_ip} port %{NUMBER:sshd_port} %{GREEDYDATA:sshd_protocol}" }
  }
}

output {
  elasticsearch {
    index => "sshd_fail-%{+YYYY.MM}"
  }
}
[root@dlp ~]#
chgrp logstash /var/log/secure

[root@dlp ~]#
chmod 640 /var/log/secure

[root@dlp ~]#
systemctl start logstash

[root@dlp ~]#
systemctl enable logstash
[3] Few minutes later, make sure logs are collected normally.
# show index list

[root@dlp ~]#
curl localhost:9200/_cat/indices?v 

health status index             uuid          pri rep docs.count docs.deleted store.size pri.store.size
yellow open   sshd_fail-2018.02 8becNsB_...   5   1         29            0    193.6kb        193.6kb
yellow open   test_index        ZtKextHO...   5   1          1            0        6kb            6kb
# show document list on index

[root@dlp ~]#
curl localhost:9200/sshd_fail-2018.02/_search?pretty 

{
  "took" : 41,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : 29,
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : "sshd_fail-2018.02",
        "_type" : "doc",
.....
.....
[4] If Kibana is running, To add the Index in Kibana, data is imported in it and possible to create visualization you like.
 
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