We have around 50 servers from where we get log4j logs. these folder where log4j are writes we have been mounted to a machine where we have Logstash, which pushes these logs into Elasticsearch. It creates a index in Elasticsearch called logstash-2018.06.25 where it stores all log information here in this table. Now I have to delete the old logs, I have read that on internet that delete with query wouldn’t be a good way, rather we should delete it using CURATOR(Elasticsearch). I have read that curator can delete the whole index. How can I configure my logstash so that it creates index based on the date.
So it will create a index/table based on day wise.
So 25-Jun-2018 index would be created on 25-Jun-2018.
Similary 26-Jun-2018 index would be created on 26-Jun-2018.
This way I would be able to drop index on older file, using this approach I would be able to have faster performance of elastic search.
To do this how to configure my logstash so that i can acheive this.
In elasticsearch output plugin you can configure index name as follows:
output {
elasticsearch {
...
index => "logstash-%{+YYYY.MM.dd}"
...
}
}
Related
I redirected all the logs(suricata logs here) to logstash using rsyslog. I used template for rsyslog as below:
template(name="json-template"
type="list") {
constant(value="{")
constant(value="\"#timestamp\":\"") property(name="timereported" dateFormat="rfc3339")
constant(value="\",\"#version\":\"1")
constant(value="\",\"message\":\"") property(name="msg" format="json")
constant(value="\",\"sysloghost\":\"") property(name="hostname")
constant(value="\",\"severity\":\"") property(name="syslogseverity-text")
constant(value="\",\"facility\":\"") property(name="syslogfacility-text")
constant(value="\",\"programname\":\"") property(name="programname")
constant(value="\",\"procid\":\"") property(name="procid")
constant(value="\"}\n")
}
for every incoming message, rsyslog will interpolate log properties into a JSON formatted message, and forward it to Logstash, listening on port 10514.
Reference link: https://devconnected.com/monitoring-linux-logs-with-kibana-and-rsyslog/
(I have also configured logstash as mention on the above reference link)
I am getting all the column in Kibana discover( as mentioned in json-template of rsyslog) but I also require bytes, session and source column in kibana which I am not getting here. I have attached the snapshot of the column I am getting on Kibana here
Available fields(or say column) on Kibana are:
#timestamp
t #version
t _type
t facility
t host
t message
t procid
t programname
t sysloghost
t _type
t _id
t _index
# _score
t severity
Please let me know how to add bytes, session and source in the available fields of Kibana. I require these parameters for further drill down in Kibana.
EDIT: I have added how my "/var/log/suricata/eve.json" looks like (which I need to visualize in Kibana. )
For bytes, I will use (bytes_toserver+bytes_toclient) which is an available inside flow.
Session I need to calculate.
Source_IP I will use as the source.
{"timestamp":"2020-05 04T14:16:55.000200+0530","flow_id":133378948976827,"event_type":"flow","src_ip":"0000:0000:0000:0000:0000:0000:0000:0000","dest_ip":"ff02:0000:0000:0000:0000:0001:ffe0:13f4","proto":"IPv6-ICMP","icmp_type":135,"icmp_code":0,"flow":{"pkts_toserver":1,"pkts_toclient":0,"bytes_toserver":87,"bytes_toclient":0,"start":"2020-05-04T14:16:23.184507+0530","end":"2020-05-04T14:16:23.184507+0530","age":0,"state":"new","reason":"timeout","alerted":false}}
Direct answer
Read the grok docs in detail.
Then head over to the grok debugger with some sample logs, to figure out expressions. (There's also a grok debugger built in to Kibana's devtools nowadays)
This list of grok patterns might come in handy, too.
A better way
Use Suricata's JSON log instead of the syslog format, and use Filebeat instead of rsyslog. Filebeat has a Suricata module out of the box.
Sidebar: Parsing JSON logs
In Logstash's filter config section:
filter {
json {
source => "message"
# you probably don't need the "message" field if it parses OK
#remove_field => "message"
}
}
[Edit: added JSON parsing]
I created a filter to break apart our log files and am having the following issue. I'm not able to figure out how to save the parts of the "message" to their own field or tag or whatever you call it. I'm 3 days new to logstash and have had zero luck with finding someone here who knows it.
So for an example lets say this is your log line in a log file
2017-12-05 [user:edjm1971] msg:This is a message from the system.
And what you want to do is to get the value of the user and set that into some index mapping so you can search for all logs that were by that user. Also, you should see the information from the message in their own fields in Kibana.
My pipeline.conf file for logstash is like
grok {
match => {
"message" => "%{TIMESTAMP_ISO8601:timestamp} [sid:%{USERNAME:sid} msg:%{DATA:message}"
}
add_tag => [ "foo_tag", "some_user_value_from_sid_above" ]
}
Now when I run the logger to create logs data gets over to ES and I can see the data in KIBANA but I don't see foo_tag at all with the sid value.
How exactly do I use this to create the new tag that gets stored into ES so I can see the data I want from the message?
Note: using regex tools it all appears to parse the log formats fine and the log for logstash does not spit out errors when processing.
Also for the logstash mapping it is using some auto defined mapping as the path value is nil.
I'm not clear on how to create a mapping for this either.
Guidance is greatly appreciated.
I try to convert a field "tmp_reponse" in integer in the file "conf" with logstash as follows :
mutate {
convert => {"TMP_REPONSE" => "integer"}
}
,but on Kibana it shows me that he is still string. I do not understand how I can make a convertion to use my fields "tmp_response" to use it like as a metric fields on kibana
thank you help me please and if there is anyone who can explain to me how I can master the metrics on Kibana and use fields as being of metrics fields
mutate{} will change the type of the field in logstash. If you added a stdout{} output stanza, you would see that it's an integer at that point.
How elasticsearch treats it is another problem entirely. Elasticsearch usually sets the type of a field based on the first input received, so if you sent documents in before you added the mutate to your logstash config, they would have been strings and the elasticsearch index will always consider that field to be a string.
The type may also have been defined in an elasticsearch template or mapping.
The good news is that your mutate will probably set the type when a new index is created. If you're using daily indexes (the default in logstash), you can just wait a day. Or you can delete the index (losing any data so far) and let a new one be created. Or you could rebuild the index.
Good luck.
I have read that it is possible to assign dynamic names to the indexes like this:
elasticsearch {
cluster => "logstash"
index => "logstash-%{clientid}-%{+YYYY.MM.dd}"
}
What I am wondering is if it is possible to assign the template dynamically as well:
elasticsearch {
cluster => "logstash"
template => "/etc/logstash/conf.d/%{clientid}-template.json"
}
Also where does the variable %{clientid} come from?
Thanks!
After some testing and feedback from other users, thanks Ben Lim, it seems this is not possible to do so far.
The closest thing would be to do something like this:
if [type] == "redis-input" {
elasticsearch {
cluster => "logstash"
index => "%{type}-logstash-%{+YYYY.MM.dd}"
template => "/etc/logstash/conf.d/elasticsearch-template.json"
template_name => "redis"
}
} else if [type] == "syslog" {
elasticsearch {
cluster => "logstash"
index => "%{type}-logstash-%{+YYYY.MM.dd}"
template => "/etc/logstash/conf.d/syslog-template.json"
template_name => "syslog"
}
}
Full disclosure: I am a Logstash developer at Elastic
You cannot dynamically assign a template because templates are uploaded only once, at Logstash initialization. Without the flow of traffic, deterministic variable completion does not happen. Since there is no traffic flow during initialization, there is nothing there which can "fill in the blank" for %{clientid}.
It is also important to remember that Elasticsearch index templates are only used when a new index is created, and so it is that templates are not uploaded every time a document reached the Elasticsearch output block in Logstash--can you imagine how much slower it would be if Logstash had to do that? If you intend to have multiple templates, they need to be uploaded to Elasticsearch before any data gets sent there. You can do this with a script of your own making using curl and Elasticsearch API calls. This also permits you to update templates without having to restart Logstash. You could run the script any time before index rollover, and when the new indices get created, they'll have the new template settings.
Logstash can send data to a dynamically configured index name, just as you have above. If there is no template present, Elasticsearch will create a best-guess mapping, rather than what you wanted. Templates can and ought to be completely independent of Logstash. This functionality was added for an improved out-of-the-box experience for brand new users. The default template is less than ideal for advanced use cases, and Logstash is not a good tool for template management if you have more than one index template.
I want a sphinx searchd to start up but there are no indexes populated as yet. I have a separate cron job that pulls data from a data source and then calls the indexer to generate the indexes.
So the first time searchd starts the cron job has not yet run, hence there are no indexes. And searchd fails with errors like:
FATAL: no valid indexes to serve
Is there any way to get around this? e.g. to start earchd even when there are no indexes and if someone searched against it during that time, it just returns no docids. Later when the cron job runs, the indexes will be populated and then searched can query those indexes.
if someone searched against it during that time, it just returns no docids.
That would require an actual index to search againast.
Just create an empty index. Then when indexer runs, it recreates the index (with data this time) and notifies searchd - using --rotate switch.
Example of a way to produce a 'empty' index, as provided by #ctx: (Added Dec, 2014)
source force {
type = xmlpipe2
xmlpipe_command = cat /tmp/test.xml
}
index force {
source = force
path = /path/to/sphinx/datadir/filename
charset_type=utf-8
}
/tmp/test.xml:
<?xml version="1.0" encoding="utf-8"?>
<sphinx:docset>
<sphinx:schema>
<sphinx:field name="subject"/>
</sphinx:schema>
</sphinx:docset>
indexer force and now searchd should be able to run.
Alternativly can use something like sql_query = SELECT 1,'' but that does require connection to a real database server.