The Sensu agent is a lightweight client that runs on the infrastructure components you want to monitor. The Sensu agent is available for Linux, macOS, and Windows

Install Sensu GO agent on Ubuntu 20.04

First, make sure you update your distribution:

sudo apt update
sudo apt upgrade

You also need to install some necessary packages:

sudo apt install curl gnupg unzip wget

Then, you should add the Sensu repository so that we can install the agent without problems.

curl -s https://packagecloud.io/install/repositories/sensu/stable/script.deb.sh | sudo bash

After that, you can install the agent without problems.

sudo apt install sensu-go-agent

Similarly, we have to download the initial configuration file of the agent and copy it to the appropriate path.

sudo curl -L https://docs.sensu.io/sensu-go/latest/files/agent.yml -o /etc/sensu/agent.yml

This file needs to be modified, but first, make a backup of it.

sudo cp /etc/sensu/agent.yml /etc/sensu/agent.yml.bak

And edit it to define the IP address where Sensu Backend is installed.

sudo nano /etc/sensu/agent.yml

And leave it as shown in the image:

Replace the IP by yours.

Now you can start the Sensu agent service and check its status.

systemctl start sensu-agent
systemctl status sensu-agent

There are many configurations available for the agent file at this link. Every time you modify the configuration file you have to restart the service to apply the changes.

It should now be visible from the backend. If not, you will probably need to restart the service.

Conclusion

Sensu Go is a very good tool that allows us to monitor services and nodes. This makes it interesting at a professional level. That is why it is recommended to take a look at it.

The post Install the Sensu GO agent on Ubuntu 20.04 appeared first on Linux Windows and android Tutorials.

Sensu is a complete solution for monitoring and observability at scale. Sensu Go is designed to give you visibility into everything you care about: traditional server closets, containers, applications, the cloud, and more.

The application is composed of three elements:

• Backend: which is the server where the monitoring operations are performed.
• Sensuctl: is a command-line tool for managing resources within Sensu.
• Agent: This microprogram is installed on those devices that we want to monitor.

In this post, we will install the first two, and in another post the agent in another one.

Install Sensu GO Monitoring Tool on Ubuntu 20.04

Note:There are many ports that we need to open for the tutorial to work. The complete list can be found at this link.

As powerful as the application is, the reality is that installing Sensu Go is quite easy.

First, in a terminal session update Ubuntu 20.04

sudo apt update
sudo apt upgrade

After that, you have to install some necessary packages such as gnupg

sudo apt install curl gnupg unzip wget

Sensu Go provides us with a script that adds its repository to our system in a very convenient way:

curl -s https://packagecloud.io/install/repositories/sensu/stable/script.deb.sh | sudo bash
Detected operating system as Ubuntu/focal.
 Checking for curl…
 Detected curl…
 Checking for gpg…
 Detected gpg…
 Running apt-get update… done.
 Installing apt-transport-https… done.
 Installing /etc/apt/sources.list.d/sensu_stable.list…done.
 Importing packagecloud gpg key… done.
 Running apt-get update… done.
 The repository is setup! You can now install packages.

Once the repository is successfully added to the system, we can start the installation by running:

sudo apt install sensu-go-backend
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following NEW packages will be installed:
  sensu-go-backend
0 upgraded, 1 newly installed, 0 to remove and 53 not upgraded.
Need to get 15.2 MB of archives.
After this operation, 41.5 MB of additional disk space will be used.

Once the application has been successfully downloaded, it is necessary to download the default configuration file:

curl -L https://docs.sensu.io./sensu-go/latest/files/backend.yml -o backend.yml

And now move it to the correct location:

sudo mv backend.yml /etc/sensu/

After this, you will be able to manage Sensu as a system service. So, start it, enable it and check the status of the service

sudo systemctl start sensu-backend
sudo systemctl enable sensu-backend
sudo systemctl status sensu-backend

As everything is OK you have to start the Backend by assigning it a username and password.

sensu-backend init --interactive
? Cluster Admin Username: admin
? Cluster Admin Password: ******
? Retype Cluster Admin Password: ******
{"component":"backend.seeds","level":"info","msg":"seeding etcd store with intial data","time":"2021-02-17T17:15:36+01:00"}
{"component":"store","level":"warning","msg":"migrating etcd database to a new version","time":"2021-02-17T17:15:36+01:00"}
{"component":"store","database_version":1,"level":"info","msg":"successfully upgraded database","time":"2021-02-17T17:15:36+01:00"}
{"component":"store","database_version":2,"level":"info","msg":"successfully upgraded database","time":"2021-02-17T17:15:36+01:00"}

Assign a username and a strong password.

Then you need to install sensuctl by running:

sudo apt install sensu-go-cli

And then you have to configure it by running:

sensuctl configure
? Authentication method: username/password
? Sensu Backend URL: http://127.0.0.1:8080
? Namespace: default
? Preferred output format: tabular
? Username: admin
? Password: ******

Leave it as I currently show you. Remember that the username and password must be the same as the one you set in the previous step.

Testing the installation

After applying the changes, you can check that the backend is working through the web interface provided by the application.

So, access it from http://your-server:3000

And you will see the Login screen

Log in with your username and password and you will see the dashboard.

Obviously, it’s empty because we haven’t added any nodes. But the backend is ready.

Conclusion

In this post, you have learned how to install a part of Sensu GO that will allow you to monitor devices on a network. Although it is a very professional application, it is really easy to install.

The post How to install Sensu GO monitoring tool on Ubuntu 20.04? appeared first on Linux Windows and android Tutorials.