Intro

This repo contains containerlab-based labs demonstrating how logs from SR Linux network elements can be collected, parsed, and stored using Elasticsearch/Logstash/Kibana (ELK) stack.

A series of blog posts go into the details of various ELK deployment models:

1. SR Linux logging with ELK - an introduction to the modern logging infrastructure using ELK stack.

Lab Topology

The srl-elk.clab.yml topology represents a 2-tier Clos fabric with 2 clients participating in a single L2 EVPN domain.

Naming conventions are straighforward:

• leaf[1-3] - leaves
• spine[1,2] - spines
• client[1,2] - emulated clients

client1 connectivity uses a single interface attached to leaf1. client2 is connected as A/S to leaf2 and leaf3 with standby link signalling using LACP.

spine1 and spine2 are acting as BGP RR. This setup is sufficient to demonstrate a way to integrate a fabric with ELK stack.

Quick start

In order to bring up your lab follow the next simple steps:

1. Clone repo

git clone https://github.com/azyablov/srl-elk-lab.git
cd srl-elk-lab

2. Deploy the lab

cd <lab folder>
sudo clab deploy -t srl-elk.clab.yml

3. For the fast and convenient start of demo, dashboard and discover search configuration objects are provided as part of the lab.

Run add-saved-objects.sh in order to avoid manual import and creation.

./add-saved-objects.sh

Demo dashboard can be adjusted as necessary.

4. Run simulation to quickly ingest data into elasticsearch as described in Simulation

Note! Index template is created automatically by logstash (to avoid automatic template creation by elastic). manage_template and template* configuration option stanzas are defining such logstash behavior.

output {
    if "srlinux" in [tags] {
        if "_grokparsefailure" in [tags] {
            file {
                path => "/srl/fail_to_parse_srl.log"
                codec => rubydebug
            }
        } else {
            elasticsearch {
                hosts => ["http://elastic"]
                ssl => false
                index => "fabric-logs-%{+YYYY.MM.dd}"
                manage_template => true
                template => "/tmp/index-template.json"
                template_name => "fabric-template"
                template_overwrite => true
                id => "fabric-logs"
            }
        }
    }
}

Simulation

In order to help quickly enrich ELK stack with logs outage_simulation.sh script could be executed with the following parameters:

-S - to replace configuration for logstash remote server under /system/logging/remote-server[host=$LOGSTASHIP]" with new one.

<WAITTIMER> - to adjust time interval between destructive actions applied (20 sec by default).

Basic configuration can found here, which represent default lab configuration, and can be adjusted per your needs and requirements.

./outage_simulation.sh -S

By default configuration for remote server using UDP:

    {
      "host": "172.22.22.11",
      "remote-port": 1514,
      "subsystem": [
        {
          "priority": {
            "match-above": "informational"
          },
          "subsystem-name": "aaa"
        },
        {
          "priority": {
            "match-above": "informational"
          },
          "subsystem-name": "acl"
        },
<...output omitted for brevity...>
    }

Note! In case TLS is a requirement, you can consider to put rsyslog in front, simple docker image with self-signed and custom certificate can be found on github.com/azyablov/rsyslogbase

To run simulation just execute ./outage_simulation.sh or ./outage_simulation.sh 15 in case machine is a bit slow or you have another labs running on the same compute.

Kibana

Your pre-configured Kibana should available via http://localhost:5601. Now you can go to to Discovery and Dashboard under Analytics and see a demo dashboard.