How to do Real Time Alerting in ELK - elasticsearch

We have ELK(+XPACK) for our network devices syslog server (source/destination IP and port). I'm trying to implement a real-time alerting system when source_ip field equals a specific IP address. How can i accomplish this with ELK?
I tried to do it with watcher, but it isn't real-time and low intervals may cause performance problems(?).
Note: log rate ~ 500 log per second.

If watcher are not fast enough, then you need sth. what will fire at the moment of data incoming. Ingest pipelines can't execute external actions, but if you have Logstah in place, then clone (https://www.elastic.co/guide/en/logstash/current/plugins-filters-clone.html) the relevant event and issue an alert via email (https://www.elastic.co/guide/en/logstash/current/plugins-outputs-email.html) or whatever suits you.
Doing so, there will be the original event in elastic and the cloned one can be processed i a separate alert pipeline.

Related

I have installed Auditbeat today and want to view audit logs which are older than a month. Is this achievable somehow?

I have installed Auditbeat today and want to view audit logs which are older than a month in Elasticsearch. Is this achievable somehow?
Tldr;
Auditbeat is a data shipper so it is just going to move the data around.
This data is mainly event, and Auditbeat listen to then, it is not reading them from a file so sadly I don't think so.
To understand
Auditbeat is composed of 3 modules:
AuditD
Get event from the kernel as the come.
This module establishes a subscription to the kernel to receive the events as they occur.
So no way to get the data from earlier this month.
File integrity
This module uses features of the operating system to monitor file changes in realtime.
It will not be able to get events from a month back.
system
Event information is sent as the events occur (e.g. a process starts or stops).
Yet again, not possible.
So you won't be able to access the data from a month from now.

Why use Beats if i can post directly to Elasticsearch?

Recently i have been reading into Elastic stack and finding out about this thing called Beats, which basically used for lightweight shippers.
So the question is, if my service can directly hit to Elasticsearch, do i actually need beats for it? Since from what i have known it's just kinda a proxy (?)
Hopefully my question is clear enough
Not sure which beat you are specifically referring but let's take an example of Filebeat.
Suppose application logs need to be indexed into Elasticsearch. Options
Post the logs directly to Elasticsearch
Save the logs to a file, then use Filebeat to index logs
Publish logs to a AMQP service like RabbitMQ or Kafka, then use Logstash input plugins to read from RabbitMQ or Kafka and index into Elasticsearch
Option 2 Benefits
Filebeat ensures that each log message got delivered at-least-once. Filebeat is able to achieve this behavior because it stores the delivery state of each event in the registry file. In situations where the defined output is blocked and has not confirmed all events, Filebeat will keep trying to send events until the output acknowledges that it has received the events.
Before shipping data to Elasticsearh, we can do some additional processing or filtering. We want to drop some logs based on some text in the log message or add additional field (eg: Add Application Name to all logs, so that we can index multiple application logs into single index, then on consumption side we can filter the logs based on application name.)
Essentially beats provide the reliable way of indexing data without causing much overhead to the system as beats are lightweight shippers.
Option 3 - This also provides the same benefits as option2. This might be more useful in case if we want to ship the logs directly to an external system instead of storing it in a file in the local system. For any applications deployed in Docker/Kubernetes, where we do not have much access or enough space to store files in the local system.
Beats are good as lightweight agents for collecting streaming data like log files, OS metrics, etc, where you need some sort of agent to collect and send. If you have a service that wants to put things into Elastic, then yes by all means it can just use rest/java etc API directly.
Filebeat offers a way to centralize live logs from Multiple Servers
Let's say you are running multiple instances of an application in different servers and they are writing logs.
You can ship all these logs to a single ElasticSearch index and analyze or visualize them from there.
A single static file doesn't need Filebeat for moving to ElasticSearch.

What happens when the ouput of Auditbeat is down

I am using the following pipeline to forward data
Auditbeat ---> logstash ---> ES
Suppose if the logstash machine goes down, I want to know how the Auditbeat handles the situation.
I would like to know the specifics like
is there a retry mechanism?
how long will it retry?
what happens to the audit logs, will it be lost?
the reason that I ask question 3 is that, we enable auditbeat by disabling auditd service (which was generating the auditlogs under /var/log/audit/audit.log). SO
if logstash goes down there is no data forwarding happening and hence there is a chance of data loss. Please clarify.
if auditbeat is storing the data while logstash is down, where is it doing so? and what is the memory(disk space) allocated to this saving process?
Thanks in advance
Auditbeat has an internal queue which stores the events before sending it to the configured output, by default this queue is a memory queue that will store up to 4096 events.
If the queue is full, no more events will be stored until the output comes back and start to receive data from auditbeat, there is a risk of data loss here.
You can change the number of the events that the memory queue stores.
There is also the option to use a file queue, which will save the events to disk before sending to the configured output, but this feature is still in beta.
You can read about the internal queue in the documentation.

Multiple Logstash instances vs Filebeats

I'm trying to establish the best architecture for our elastic stack implementation.
We have two distinct networks (lets call them internal and external) and several web / db / application servers (approx 10) on each of these networks.
I would like to consume IIS logs, our rabbitMQ messages and some other bits and bobs from machines in both networks and send them to a single server on the internal network where my elastic and kibana installation are located.
For the servers on both the internal and external networks I can see two main ways to get the logs sent to elastic.
Setup logstash on each server and send the output to the elastic server on the internal network.
Setup filebeats on each server and send the logs to a single server running logstash (this could be the same box that hosts elastic and kibana)
I'm unsure of the pros and cons of these approaches at the moment. I believe the correct approach is to use Filebeats, but I'm unaware why I wouldn't just put logstash in multiple places as it seems like I would be better distributing the processing of logs.
Then again, perhaps having one logstash with 20-30 inputs isn't a problem?
Interested in any thoughts or guidance in this area.
From what I read in the documentation, Logstash is much more demanding in term of memory than Filebeat, especially if you do some kind of treatment on the logs (like grok parsing). Logstash represent at least a JVM (with JRuby). For filebeat, I assume its footprint is much smaller, since it's optimized for shipping logs (I never used it, so I can't say).
Also it complicates any update you would want to do to the Logstash instances or their configurations.
For a centralized Logstash, the advantage would be that it is easy to change the adress of the Elasticsearch instance, redirect to a cache like redis or add another output. I also found Logstash (in version 2.+) required frequent restart, so that's easier if you only have one instance to deal with.
I have never used Logstash with multiple inputs, so I can't say.
In the job where I was responsible of a log centralisation system, we used beaver (a filebeat equivalent) to ship the logs to a redis server and we had two or three Logstash server sending everything to Elasticsearch. All of the comments above comes from that period.

Monitoring health of logstash

I am going to be using logstash to send a high amount of events to a broker. I have monitoring of the broker to check the health status, but I can't find much information on how to see if the logstash process is healthy, if there are indicators of a failing process.
I was interested for those who use logstash, what are some ways you monitor it?
You can have a cronjob inject a heartbeat message and route such messages to some kind of monitoring system. If you already use Elasticsearch you could use it for this as well and write a script to ensure that you have reasonably recent heartbeat messages from all hosts that should be sending messages, but I'd prefer using e.g. Nagios or lovebeat-go.
This could be used to monitor the health of a single Logstash instance (i.e. you inject the heartbeat message into the same instance that feeds the monitoring software) but you could just as well use it to check the overall health of the whole pipeline.
Update: This got built into Logstash in 2015. See the announcement of the Logstash heartbeat plugin.
If you're trying to monitor logstash as a shipper, it's easy to write a script that would compare the contents of the .sincedb* file to the actual file on disk to make sure they're in sync.
As an indexer, I'd probably skip ahead and query ElasticSearch for the number of documents being inserted.
#magnus' idea for a latency check is also good. I've used the log's timestamp and compared it to ElasticSearch's timestamp to compute the latency.

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