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Install Oracle Java 16

On Ubuntu Ubuntu 14.04, Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04, Ubuntu 20.10

Firstly add the repository

sudo add-apt-repository ppa:linuxuprising/java

Now update the cache and install java

sudo apt update

sudo apt install oracle-java16-installer

You have the possibility to not set java 16 as default, just type this instead

sudo apt install oracle-java16-installer --no-install-recommends

You will be asked to agree to the license agreement, tab and choose “ok

and if you want to remove the ppa

sudo add-apt-repository --remove ppa:linuxuprising/java

and you can also completely remove java 16 again with this command

sudo apt-get remove oracle-java16-installer

But that would kinda ruin the whole exercise of installing it in the first place.

Enjoy!

Display network traffic

Ubuntu server

Looking for an easy simple way to display network traffic, just run the command

sudo iftop

Type you sudoers password, and bingo

Simple nothing to disturb you, just the simple facts

Should it, against better judgement, not be installed, then just run

sudo apt install iftop

You just gotta love it!

Install the NFS Client

Ubuntu 18.4 – the Client Side

Install NFS on the client system and mount the share.

Step 1: Install NFS-Common Package

Start by updating the system packages and repositories before anything else.

sudo apt update

Next, install nfs-common packages.

sudo apt install nfs-common

Step 2: Create a NFS Mount Point on Client

Next, you will have to create a mount point on which you will mount the NFS share from the server. Run the command:

sudo mkdir -p /mnt/nfs_clientshare

Step 3: Mount NFS Share on Client System

The last step remaining is mounting the NFS share that is shared by the NFS server. This will enable the client system to access the shared directory.

Let’s check the NFS Server’s IP address.

ifconfig

To achieve this run the command:

sudo mount 192.168.22.234:/mnt/nfs_share  /mnt/nfs_clientshare

Great your are done!

Ubuntu 18.04 – Install and Configure an NFS Server

Installing and configuring NFS Server on Ubuntu

To install and configure the NFS server:

Step 1: Install NFS Kernel Server in Ubuntu

The first step is to install the nfs-kernel-server package on the server.
But before we do this, let’s first update the system packages.

sudo atp update

Once the update is complete, proceed and install the nfs-kernel-server package as shown below. This will store additional packages, which are equally crucial to the setup of the file share.

sudo apt install nfs-kernel-server

Step 2: Create an NFS Export Directory

The second step will be creating a directory that will be shared among client systems. This is also referred to as the export directory and it’s in this directory that we shall later create files which will be accessible by client systems.

Run the command below by specifying the NFS mount directory name.

sudo mkdir -p /mnt/nfs_share

Since we want all the client machines to access the shared directory, remove any restrictions in the directory permissions.

sudo chown -R nobody:nogroup /mnt/nfs_share/

You can also tweak the file permissions to your preference. Here’s we have given the read, write and execute privileges to all the contents inside the directory.

sudo chmod 777 /mnt/nfs_share/

Step 3: Grant NFS Share Access to Client Systems

Permissions for accessing the NFS server are defined in the /etc/exports file. So open the file using your favorite text editor:

sudo nano /etc/exports

You can provide access to a single client, multiple clients or specify an entire subnet.

In this guide, we have allowed en entire subnet to have access to the NFS share.

/mnt/nfs_share  192.168.22.0/24(rw,sync,no_subtree_check)

Explanation about the options used in the above command.

  • rw: Stands for Read/Write.
  • sync: Requires changes to be written to the disk before they are applied.
  • No_subtree_check: Eliminates subtree checking.

To grant access to a single client, use the syntax:

/mnt/nfs_share  client_IP_1 (re,sync,no_subtree_check)

For multiple clients, specify each client on a separate file:

/mnt/nfs_share  client_IP_1 (re,sync,no_subtree_check)
/mnt/nfs_share  client_IP_2 (re,sync,no_subtree_check)

Step 4: Export the NFS Share Directory

After granting access to the client systems, export the NFS share directory and restart the NFS server for the changes to take effect.

sudo exportfs -a
sudo systemctl restart nfs-kernel-server

Step 5: Allow NFS Access through the Firewall

For the client to access the NFS share, you need to allow access through the firewall otherwise, accessing and mounting the shared directory will be impossible. To achieve this run the command:

sudo ufw allow from 192.168.43.0/24 to any port nfs

Reload or enable the firewall (if it was turned off) and check the status of the firewall. Port 2049, which is the default file share, should be opened.

sudo ufw enable
sudo ufw status

We’re done installing and configuring the NFS service on the Server, let’s now install NFS on the client system.

Ubuntu Server 18.4

Change back to default repository

Here is how to revert you changes back to default, if you for some reason changed your repositories in Ubuntu i.e install php updates or other 😉

Go to https://repogen.simplylinux.ch.

Select your Country and Ubuntu Release.

For the default set of repositories, you need to enable these repositories.

  • All of the Ubuntu Branches repositories.
  • Security – Important Security Updates.
  • Security Sources Repository
  • Updates – Recommended Updates
  • Updates Sources Repository

If you want to install software from Canonical Partner Repositories (closed source software), enable the Ubuntu Partner Repositories (both of them).

Enable any 3rd party repository you wish to enable.

Now, click the Generate List button at the bottom of that page and you’ll see your generated sources.list.

Replace the old sources.list with the new one

Run the following commands in a Terminal.

sudo mv /etc/apt/sources.list /etc/apt/sources.list.old
sudo nano /etc/apt/sources.list

Copy/paste all the text from the newly generated sources.list to this file. Save it and close Gedit.

Now, update apt.

sudo apt-get update

This will update your repository index with the current sources.list and then you can install any software using Software Center, Synaptic or apt-get.

 

Enjoy and have fun updating without errors, again!

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