RHCSA & RHCE – RHEL8 new Features

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RHCSA & RHCE – RHEL8 new Features

Hey Guys!

As the title says, in this post, I’ll explain the main changes that RedHat deployed in the new RHEL version. According to them, this new version includes a hundred of changes and new features, but in this case, I’ll only explain the related with the basic administration and changes that maybe can apply to the certification RHCSA & RHCE.

Let’s begin with the list of changes:

  • Software Management:
    • Yum package manager was removed and now we will use DNF, if you are a fedora user you should know how it works and some of the new functionalities that include this change
  • Database:
    • RHEL 8 now include the following databases in their repositories: MariaDB 10.3, MySQL 8.0, :PostgreSQL 10, PostgreSQL 9.6, and Redis 4.0.
  • GUI:
    • GNOME Shell has been rebased to version 3.2. NOT USED in the RHCSA and RHCE but for some is important
  • Storage:
    • The Stratis local storage manager has been introduced. Stratis enables you to easily perform complex storage tasks and manage your storage stack using a unified interface.
  • Networking
    • The nftables will be the new framework that replaces iptables, with this change now Firewalld daemon will use nftables

 

So, the question is: 

The new version 8 will change the methods to resolve the RHCSA and RHCE?
And the answer is RHCSA=No; RHCE= A bit.

Why?

YUM is not erased totally in the OS, so we can continue creating private repos with yum and createrepo command, updating our packages with yum, etc, but also we will have DNF command available. Reference: https://dnf.readthedocs.io/en/latest/cli_vs_yum.html

Databases is part of RHCE exam but the new versions available in the official repos doesn’t impact the method to resolve the exam.

GUI is not used in a “REAL” Linux exam.

Storage is one of the hardest parts of these exams, but we can continue using the pvcreate, vgcreate and lvcreate commands, remember that Stratis will use it only for huge environments.

**Netwoking, for the RHCSA we use only firewalld in order to open some ports. But for RHCE we need to have more knowledge about iptables, so I recommend learn more about nftables, the good news is that nftables its the easiest firewall to create and maintenance rules. For example:

nft add rule ip6 filter input tcp dport {telnet, http, https} accept

More details: https://www.netfilter.org/projects/nftables/manpage.html

This command allows the input traffic to our server for the telnet, http and https protocols with IPv6

For the NFS, not impact to change the username or ID.

Finally, the Apache server is part of the scope for the RHCE, but with the new version you won’t have any issue to resolve the exam.

When will be available the RHEL 8 exam?

Until today (Jan 23 2019) exist scheduled exams for June 2019. RHEL 8 still being a beta version. So we are waiting for mid-year to know more official news from RedHat.

What can I do to reach this cert?

If you are not a Linux Expert: Practice with VM’s, destroy it and restore it, I totally recommend the Asghar Ghori Book:  https://www.amazon.com/gp/product/1495148203/ref=dbs_a_def_rwt_bibl_vppi_i0

Also you can be part of a Free training by RedHat: https://www.edx.org/course/fundamentals-red-hat-enterprise-linux-red-hat-rh066x
 

If you are a Linux Expert: Just focus the practice in RHEL commands. The exam will be very easy for you.

Good luck to everyone!

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