pcap yum doc (#281)

* pcap yum doc

* prereq

* minor changes

docs/install-traffic-capture-sensors/pcap-sensor/pcap-sensor-yum-package.md

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+---
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+
+# PCAP Sensor via YUM Package
+
+## Install on RPM based Linux Distributions via `yum`
+
+### Prerequisites
+- `libpcap` should be installed from the yum repository
+- Admin (or `sudo`) privileges on the host
+
+### 1. Configure the package manager
+
+Configure `yum` to access Levo's RPM packages using the following command:
+
+```shell
+sudo tee -a /etc/yum.repos.d/levo.repo << EOF
+[levo]
+name=Levo.ai
+baseurl=https://us-yum.pkg.dev/projects/levoai/yum-levo
+enabled=1
+repo_gpgcheck=0
+gpgcheck=0
+EOF
+```
+
+### 2. Install the pcap Sensor
+
+Install the pcap Sensor from Levo's RPM repository.
+
+1. Update the list of available packages:
+  ```shell
+  sudo yum makecache
+  ```
+
+1. Install the package in your repository.
+  ```shell
+  sudo yum install levo-pcap-sensor-0.1.3
+  ```
+
+Enter `y` when prompted.
+
+### 3. Start the Sensor
+
+Sensor is running as a Systemd Service
+
+1. Configure Satellite Address, Organization-Id and Environment
+
+The Satellite address is configured in `/etc/default/sensor-env`. The default Satellite URL is `https://collector.levo.ai`.
+
+Edit `/etc/default/sensor-env`, set the `LEVO_SATELLITE_URL` variable to the desired `host:port` value,
+and set the `LEVO_ORG_ID` to the Organization ID fetched from the Levo Dashboard.
+Set `LEVO_ENV` to the desired environment name in which you wish to see you applications on the Levo Dashboard.
+
+```bash
+...
+LEVO_ENV="your-env"
+LEVO_SATELLITE_URL="your-satellite-url"
+LEVO_ORG_ID="your-org-id"
+...
+```
+
+**A Sensor *restart* is required for the config changes to take effect.**
+
+
+2. Start/Stop the Sensor
+
+To start the sensor
+```bash
+sudo systemctl start pcap-sensor.service
+```
+
+To stop the sensor
+```bash
+sudo systemctl stop pcap-sensor.service
+```
+
+To restart the sensor
+```bash
+sudo systemctl restart pcap-sensor.service
+```