CentOS Stream 8
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Elastic Stack 7 : Install Logstash2021/06/22
 
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 ~]#
dnf -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] and output to index [sshd_fail-yyyy.mm] in elasticsearch.
[root@dlp ~]#
vi /etc/logstash/conf.d/sshd.conf
# create new

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 {
    hosts => ["http://localhost:9200"]
    index => "sshd_fail-%{+YYYY.MM}"
  }
}
[root@dlp ~]#
chgrp logstash /var/log/secure

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

[root@dlp ~]#
systemctl enable --now 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
green  open   .kibana_7.13.2_001              zA_r0rrjT7OMUMVSGmRVfg   1   0         16           22      2.1mb          2.1mb
green  open   .apm-custom-link                d1-9Pkn-RXOu_qhMOanvVA   1   0          0            0       208b           208b
green  open   .kibana-event-log-7.13.2-000001 Y-rCmM6yTBKa9W5H1LeJ1g   1   0          1            0      5.6kb          5.6kb
green  open   .apm-agent-configuration        y3hQme2SQpGMtb64NLsNdA   1   0          0            0       208b           208b
green  open   .kibana_task_manager_7.13.2_001 x6V232xKQLinqRedJRAbgw   1   0         10          761    279.3kb        279.3kb
yellow open   test_index                      Vh0HutpLRciaMWX3pFo7Zg   1   1          1            0      5.5kb          5.5kb
yellow open   sshd_fail-2021.06               HiOI2ac-RzK2BiwQ_gb-VQ   1   1         24            0     44.8kb         44.8kb
# show document list on index

[root@dlp ~]#
curl localhost:9200/sshd_fail-2021.06/_search?pretty 

{
  "took" : 1,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 24,
      "relation" : "eq"
    },
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : "sshd_fail-2021.06",
        "_type" : "_doc",
        "_id" : "bqF2MXoB8xzJeutJBHhI",
        "_score" : 1.0,
        "_source" : {
          "sshd_invalid_user" : "cent",
          "sshd_protocol" : "ssh2",
          "@timestamp" : "2021-06-22T02:04:14.993Z",
          "host" : "dlp.srv.world",
          "type" : "seucure_log",
          "sshd_auth_type" : "password",
          "sshd_client_ip" : "::1",
          "sshd_port" : "33424",
          "tags" : [
            "sshd_fail"
          ],
          "message" : "Jun 21 21:04:14 dlp sshd[3101]: Failed password for cent from ::1 port 33424 ssh2",
          "@version" : "1",
          "path" : "/var/log/secure"
        }
      },
.....
.....
[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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