The importance of logs

Logs are very useful for understanding what happens within the cluster, from debugging to monitoring activities. Sometimes, however, the infrastructure where the applications run does not have native tools that offer exhaustive logs. For example, if the container, pod, or node stopped working or were deleted, we would also lose our logs. Therefore, it is advisable to store the logs separately, inside or outside the cluster, to understand the source of the problem or to reuse them in future analysis. This is called cluster-level-logging. Kubernetes does not natively have this paradigm, so sometimes you have to rely on external software.

The procedure described procedure illustrated in this paragraph is carried out performed on a VM outside , that does not belong to the cluster. The  The ElasticSearch&Kibana service will receive the logs from the cluster being monitored, which will have to take care to correctly point the target VM that receives its data.

Service installation

For the installation of ElasticSearch and Kibana we will use Docker-Compose (it is better to check that the version of Docker-Compose is updated). It is recommended that you create a folder and place the docker-compose.yml file in it.

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