Month: January 2023

Hello,
In this week’s feature highlight, we look at How to Install Netdata on Ubuntu 22.10

Netdata is an Open Source real-time server monitoring tool. It collects real-time data like CPU usage, RAM usage, Load, SWAP usage, Bandwidth usage, Disk usage, etc.

Update the Server

Update the server using the following command.

apt update 

Downloading the Netdata package

Now you can proceed further to install the Netdata on the server. Run the following command on the server.

apt install netdata -y

The -y is use for the confirmation which will be prompted by the installer.

Netdata configuration file

We need a small change in the configuration file.

nano /etc/netdata/netdata.conf 

The configuration file will look like this

[global]
        run as user = netdata
        web files owner = root
        web files group = root
        # Netdata is not designed to be exposed to potentially hostile
        # networks. See https://github.com/netdata/netdata/issues/164
        bind socket to IP = 127.0.0.1

By default the bind socket to IP is set to 127.0.0.1. To access the dashboard using the IP address, you need to replace the 127.0.0.1 with your server IP address.

[global]
        run as user = netdata
        web files owner = root
        web files group = root
        # Netdata is not designed to be exposed to potentially hostile
        # networks. See https://github.com/netdata/netdata/issues/164
        bind socket to IP = <Enter your IP address here>

Now save the file and restart the netdata service using the following command.

systemctl restart netdata 

Firewall

If the firewall is enabled, then allow the port using the following command.

ufw allow 19999

Netdata Dashboard

Enter the following URL on the browser to access the Netdata dashboard. By default netdata works on 19999 port.

http://<Enter Your IP Here>:19999/

The dashboard will look like this.

Hello,

In this week’s feature highlight, we look at How to Install Linux kernel 6.0 on Ubuntu 22.10

Kernel is central component of an operating system that manages operations of computer and hardware. It basically manages operations of memory and CPU time. It is core component of an operating system. Kernel acts as a bridge between applications and data processing performed at hardware level using inter-process communication and system calls.

Step 1 – Update your system

First, Update the system packages to the latest versions using the below apt commands,

 apt update
 apt upgrade

Install some of the packages required for the Kernel upgrade,

 apt install gcc make perl wget

Step 2 – Installing Linux Kernel 6.0

By default on Ubuntu 22.10, The kernel version it ships with is version 5.19

Linux Kernel 6.0 is not available on Ubuntu 22.10 base repository. So we will manually download the required Linux Kernel packages from the official site and install.

You can check their official site for a list of available kernel versions that can be installed, kernel.ubuntu.com.

At the time of writing this article, version 6.0.9 was the only latest kernel we could install with.

If you find any newer versions that can be installed, please go ahead with it.

Some points to note, for selecting a different version of kernel.
Open the site kernel.ubuntu.com and scroll to the bottom of the page.
Find a version whose builds are successful, under that, navigate to “amd64” folder.
You will find the required four files to download on the ubuntu system, Linux Headers, Linux Image and Linux Modules.
A successful build looks like below:

Test amd64/build succeeded (rc=0, on=amd64, time=0:12:37, log=amd64/log)
amd64/linux-headers-6.0.9-060009-generic_6.0.9-060009.202211161102_amd64.deb
amd64/linux-headers-6.0.9-060009_6.0.9-060009.202211161102_all.deb
amd64/linux-image-unsigned-6.0.9-060009-generic_6.0.9-060009.202211161102_amd64.deb
amd64/linux-modules-6.0.9-060009-generic_6.0.9-060009.202211161102_amd64.deb

For upgrading to the latest kernel on Ubuntu, follow the given instructions:

wget https//:kernel.ubuntu.com/~kernel-ppa/mainline/v6.0.9/amd64/linux-headers-6.0.9-060009_6.0.9060009.202211161102_all.deb

wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v6.0.9/amd64/linux-headers-6.0.9-060009-generic-6.0.9060009.202211161102_amd64.deb

wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v6.0.9/amd64/linux-image-unsigned-6.0.9-060009-generic_6.0.9060009.202211161102_amd64.deb

wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v6.0.9/amd64/linux-modules-6.0.9-060009-generic_6.0.9060009.202211161102_amd64.deb

Now, install the downloaded files using the dpkg command as shown below,

Ensure that there are no other .deb files apart from the ones that were downloaded.
If there are any other .deb files, recommended to remove them before proceeding.

dpkg -i *.deb

After installing the Linux Kernel 6.0, reboot the system to run the new Kernel

reboot

Step 3 – Verify the Kernel version

To verify the kernel installed and running after the reboot, use the uname command as shown below,

uname -r

Output:

root@vps:~# uname -r
6.0.9-060009-generic

This concludes the topic of installing the latest version of Kernel on a Ubuntu System.

Hello,

In this week’s feature highlight, we look at How To Install and Configure Elasticsearch on Ubuntu 22.10

Elasticsearch is a platform for real-time, distributed data analysis. Because of its usability, potent features, and scalability, it is a well-liked option. Installing Elasticsearch, configuring it for your use case, securing your installation, and beginning to work with your Elasticsearch server.

First, check for any pending system upgrade

Let’s update software packages first. To perform updates, run the following command:

apt update
apt dist-upgrade

Install the APT HTTPS Transport package, with the following command,

apt install apt-transport-https

Install from APT Repository

Download and install the public signing key:

Wget -qo - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo gpg --dearmor -o /usr/share/keyrings/elasticsearch-keyring.gpg

To Save the repository definition to

echo "deb [signed-by=/usr/share/keyrings/elasticsearch-keyring.gpg] https://artifacts.elastic.co/packages/8.x/apt stable main" | sudo tee /etc/apt/sources.list.d/elastic-8.x.list

Install Elasticsearch on Ubuntu 22.10

apt install elasticsearch

During the installation, you will be provided with the elastic superuser password. Kindly note it down for future usage.

Update Firewall Settings

Allow port 9200 for Elasticsearch by running the following ufw command

ufw allow from <yourserver.ip.address> to any port 9200

Enable the firewall service:

ufw enable

Next, view firewall service status:

ufw status

Configuring Elasticsearch

Let us configure Elasticsearch, we will edit its main configuration file elasticsearch.yml, which contains the majority of its configuration options. This file is located in the directory /etc/elasticsearch.

Edit the Elasticsearch configuration file with your preferred text editor. We’ll use nano in this case:

nano /etc/elasticsearch/elasticsearch.yml

Note: Elasticsearch’s configuration file is in YAML format, which means that we need to maintain the indentation format. Be sure that you do not add any extra spaces as you edit this file.

Output:

# Set the bind address to a specific IP (IPv4 or IPv6):
#
network.host: localhost
#

Because we specified localhost, Elasticsearch will listen on all interfaces and bound IPs. If you only want it to listen on one interface, use its IP address instead of localhost. Elasticsearch.yml should be saved and closed. If you’re using nano, you can do so by pressing CTRL+X, then Y, and finally ENTER.

These are the bare minimum settings you can use to get started with Elasticsearch. You can now launch Elasticsearch for the first time.

Systemctl will start the Elasticsearch service. Allow Elasticsearch a few moments to load. Otherwise, you may receive errors indicating that you are unable to

Start the Elasticsearchservice,

systemctl start elasticsearch

Enable the Elasticsearchservice,

systemctl enable elasticsearch

Verify that the Elasticsearch has been installed and running on the server by running the following command:

curl --cacert /etc/elasticsearch/certs/http_ca.crt -u elastic https://localhost:9200

You will be prompted to enter the password for the elastic user. Use the password that was provided to you during the installation from earlier.

Output:

root@vps:~# curl --cacert /etc/elasticsearch/certs/http_ca.crt -u elastic https://localhost:9200
Enter host password for user 'elastic':
{
  "name" : "vps.server.com",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "HZcPm0lAQMCcsx94chOPPA",
  "version" : {
    "number" : "8.5.1",
    "build_flavor" : "default",
    "build_type" : "deb",
    "build_hash" : "c1310c45fc534583afe2c1c03046491efba2bba2",
    "build_date" : "2022-11-09T21:02:20.169855900Z",
    "build_snapshot" : false,
    "lucene_version" : "9.4.1",
    "minimum_wire_compatibility_version" : "7.17.0",
    "minimum_index_compatibility_version" : "7.0.0"
  },
  "tagline" : "You Know, for Search"
}
root@vps:~#

This concludes the Installation and Configure Elasticsearch on Ubuntu 22.10.