How to Install Sensu on Manjaro

Sensu is a monitoring tool that helps you keep track of your system's infrastructure, applications, and services. This tutorial will guide you through the process of installing Sensu on Manjaro, a Linux distribution based on Arch Linux.

Prerequisites

Before you start with the installation, make sure that you have the following:

A Manjaro-based Linux system.
A user account with sudo privileges.
A terminal emulator.

Step 1: Install Sensu Repository

To install Sensu, you need to add their repository to your system. Follow the below steps:

Open your terminal emulator.
Update your system's packages and repositories by running the following command:
```
sudo pacman -Syu
```
Install curl so that you can download the Sensu repository:
```
sudo pacman -S curl
```
Download and add the Sensu repository GPG key. This will validate package installations from Sensu's repository:
```
curl -s https://packagecloud.io/install/repositories/sensu/stable/script.rpm.sh | sudo bash
```

Step 2: Install Sensu

Once you have added the Sensu repository, you can install its packages using the below command:

sudo pacman -S sensu

This command installs the Sensu packages along with its dependencies on your Manjaro system.

Step 3: Start Sensu Services

After installing the Sensu packages, you need to start the Sensu services by running the following command:

sudo systemctl start sensu-{api,backend,server}

This command starts the sensu-api, sensu-backend, and sensu-server services.

Step 4: Create a Sensu Client

To monitor your application or infrastructure, you must install a Sensu client on your system. You can generate the Sensu client configuration file and install the client using the sensu-client package.

Run the below command to generate a Sensu client configuration file:
```
sensuctl entity create "check-client1" --subscription linux --environment default --host-ip "127.0.0.1" --entity-class "proxy" --json | sensu-backend store
```
In the above command, check-client1 is the name of the client. Replace it with a name that is relevant to your setup. Additionally, --subscription is the group that the client is part of, --environment is the environment in which the client operates, --host-ip is the IP address of the client, and --entity-class is the type of the entity (proxy for clients).
Install the sensu-client package on your system by running the following command:
```
sudo pacman -S sensu-go-agent
```
After installing the sensu-client, start the client by running the following command:
```
sudo systemctl start sensu-go-agent
```

Step 5: Verify Sensu Installation

To verify that Sensu is installed correctly, you can open the Sensu dashboard in your browser:

Open a web browser on your system.
Navigate to http://localhost:3000.
The Sensu dashboard should load, and you can log in with the following credentials:
- Username: admin
- Password: P@ssw0rd!

You have successfully installed Sensu on Manjaro and configured a client. You can customize your monitoring setup by adding checks and handlers to your Sensu configuration.