Evolution of Red Hat Courses and Exams with Red Hat Enterprise Linux 7

Red Hat Enterprise Linux 7 represents an exciting next step in the continued evolution of the product family and is perhaps the most comprehensive update in the 11 years I’ve been with the company. New tools such as systemd, firewalld, OpenLMI and others changes the paradigm for enterprise Linux administration by providing greater centralization and automation for the administrator. Other enhancements improve performance, security and scalability. Red Hat Training has substantially updated the RHCE level curriculum to integrate these improvements. The technical changes in the new release are such that even veteran, practicing Linux administrators should consider taking additional training.

In addition to incorporating new technical features from Red Hat Enterprise Linux 7, major releases provide an opportunity for Red Hat Training to make structural changes to improve our curriculum. Over the past two years we’ve surveyed our customers, partners and instructors and have been looking forward to the opportunity to make these changes. There are four enhancements I’d like to call out specifically.

1) Red Hat System Administration I (RH124) is the entry point to the Linux curriculum and is the first 5 days of the nine day curriculum leading to RHCSA certification. Based on customer feedback, we have substantially increased the command line administration approaches in the new course, diving right in on day one. In turn we will be retiring the Red Hat Command Line Administration (RH190) course.

2) Following feedback from our certified professionals community, the Red Hat System Administration III course (RH255) has been revised to include several chapters on shell scripting. The course continues to cover key network services such as Apache, DNS, iSCSI and also provides a tech preview of the new container features in Docker.

3) Perhaps the change I’m most excited about is the new Red Hat Certification Lab course (RH300) which replaces the flagship RHCE Rapid Track Course which first ran 15 years ago. The reality is that as Linux has become a true enterprise platform, the requirements to be a Red Hat Certified Engineer have grown commensurately. Red Hat’s courses are dense and its simply not possible to cover the thirteen days of content in Red Hat System Administration I, II and III in four days.

The new Red Hat Certification Lab course seeks to meet the very specific needs of students who have completed their training and desire practice before taking the RHCE exam. Students will spend 80-90% of their time “in labs”, complimented by a handful of lectures by an instructor on key new functionality like systemd, firewalld and the new boot process. Labs will be self-paced, with the instructor serving more as a teaching assistant as students require assistance. Students will have access to the full set of labs for both the RHCSA Rapid Track course (RH200) and the Red Hat System Administration III (RH255), providing comprehensive coverage for the competencies which are presented in the RHCSA and RHCE exams.

4) Over the past four years live virtual training (VT) and self-paced training have become primary delivery methods for our customers. To address those needs, the updated course materials and labs were redesigned to be completely inter-operable between different modalities, ensuring our customers get the same learning experience. Our self-paced training platform, Red Hat Online Learning (ROLE), is ready to deliver the System Administation I & II courses and the RHCSA Rapid Track globally via six Amazon EC2 data centers. The System Administration III course and the RHCE Certification Lab will be available in coming weeks as will translations of all five courses into eight other languages.

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 Article Source - http://servicesblog.redhat.com/2014/06/10/evolution-of-red-hat-courses-and-exams-with-red-hat-enterprise-linux-7/

Some Amazing tips for networking with nmcli

When team interface is up you can check that how many interface is connected :
[root@localhost ~]# teamdctl  team0 state
setup:
runner: activebackup
ports:
ens6
link watches:
link summary: up
instance[link_watch_0]:
name: ethtool
link: up
ens7
link watches:
link summary: up
instance[link_watch_0]:
name: ethtool
link: up
runner:
active port: ens6
[root@localhost ~]#
Note: Here two different ports are connected ens6 , ens7
To disconnect any ports :
=======================
[root@localhost ~]# nmcli  device  disconnect ens6
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]# teamdctl  team0 state
setup:
runner: activebackup
ports:
ens7
link watches:
link summary: up
instance[link_watch_0]:
name: ethtool
link: up
runner:
active port: ens7

Article Source - http://www.rhce.co.in/amazing-tips-networking-nmcli/

Tips For Restoring Permissions and ownership of Files in Redhat 6/7

Problem:
=======
Permissions and Ownership on critical system files (in /etc/) directory modified. This may cause the system to not boot, lots of errors and Kernel Panic.
cause:
=====
Someone accidentally typed chmod -R 777 /etc
Solution:
=========
The RPM package manager maintains a database for all files that it installs onto the system. This includes information such as the filename, installation path, owning package and the file system ownership and permissions (including SELinux file context information). In the event that ownership or permissions are inadvertently changed, for example, through accidental misuse of the chown or chmod commands, it is possible to revert these to their values as stored in the database.
1. To re-set ownership and permissions for all packages on the system:
root@ubuntu12:~# rpm –setperms -a
root@ubuntu12:~# rpm –setugids -a
2. To re-set ownership and permissions for a specific package on the system
root@ubuntu12:~# rpm –setperms <package name>
root@ubuntu12:~# rpm –setugids <package name>
……………….OR …………..
1) To reset uids and gids on files and directories :
root@ubuntu~:# for u in $(rpm -qa); do rpm –setugids $u; done
2) To permissions on files and directories
root@ubuntu12:~# for p in $(rpm -qa); do rpm –setperms $p; done

Article Source - http://www.rhce.co.in/tips-for-restoring-permissions-and-ownership-of-files-in-redhat-67/

Commandments of RHEL 7

 RedHat breathed new life to the Red Hat Enterprise Linux Operating system there by giving birth to enthralling RHEL 7 which transcends the boundaries of an OS with vessels for containerized applications. Hence RHEL 7 is no longer just a simple OS but an abstracted component in the larger RedHat ecosystem. For a flawless understanding of the significant features of RHEL 7 it would be better to go through the following 10 Red commandments 

• RHEL 7 offers an increased support for hosting Virtualized Windows server Edition than RHEL 6 and with an updated SAMBA 4, RHEL 7 is almost a member of Microsoft network 

• RHEL 7 has the responsibility of an OS subscription model which is tuned for a stable business deployment. It prevents instance of being out of support or highly re configured.

• RHEL 7 is a huge pile of code, running 4.3GB in the DVD ISO 

• Red Hat’s support of Linux containers (LXC) which helps the users to deploy Type-2, OS-based virtualization, rather than Type-1 bare metal hypervisors. LXC allows the container to be both lightweight and highly isolating.

• RHEL 7 support project atomic which allows moving a workload from one OS to another as transparent to workload. This becomes the job of relationship stack components especially open stack. Thus once an app tests successfully as an isolatable container instance, it can become a package, much as software appliances are found and deployed.

• RHEL 7 now uses the xfs file system instead of ext4 by default. This means that RHEL can handle extremely large file systems, as much as 8 exbabyte.

• RHEL 7 offers a tighter link to Active Directory. Hence those looking for a cross platform compatibility with Windows active directory receive new Kerberos support that allow them to do this.

• RHEL 7 is easier to install and deploy: The RHEL 7 kernel update to 3.20 is similar to Canonical’s implementation. In terms of distribution RHEL7 slightly easier to deploy on bare metal, and about the same on VMware, Hyper-V, and Citrix XenServer. 

• RHEL 7 is built for business environment at the installation time one should choose from several type of base environment like minimal, infrastructure server, file and print server, basic web server, virtualization host etc.

• RHEL 7 in peppy in terms of performance Gnome is very dynamic. And optimization of varying roles could be well documented. RedHat can increase output through a new feature of network port teaming.

Red Hat Cloud Infrastructure 5 Now Available

Gordon Tillmore, Red Hat
Earlier this week, we announced the release of Red Hat Cloud Infrastructure 5.  Customers can use  this recent release to move towards open hybrid cloud working alongside existing infrastructure investments, and allowing for workload portability from a customer’s private cloud to Amazon EC2, or the reverse, if desired.   The product is our Infrastructure-as-a-Service solution providing:

• a flexible and open solution to build out a centrally managed heterogeneous virtualization environment,
• a private cloud for traditional workloads based on virtualization technologies, and
• a massively scalable OpenStack-based cloud for cloud-enabled workloads

Version 5 -an important release for Red Hat Cloud Infrastructure
Version 4 already included three tightly integrated Red Hat technologies: Red Hat CloudForms, an award winning Cloud Management Platform (CMP), Red Hat Enterprise Virtualization, a full-featured enterprise virtualization solution, and Red Hat Enterprise Linux OpenStack Platform, our fully supported, enterprise grade OpenStack offering.  Red Hat Enterprise Linux has also been a key ingredient, serving as the basis for Red Hat Enterprise Virtualization and Red Hat Enterprise Linux OpenStack Platform, as well as a guest operating system at the tenant layer. And now, with Red Hat Cloud Infrastructure 5, Red Hat is introducing Satellite 6 to it’s award winning cloud infrastructure. Satellite 6 is accessible with no extra cost, to help organizations better manage the lifecycle of their cloud infrastructure.

To More RHCA Training please Visit on - www.rhce.co.in

With Red Hat Satellite  customers will have a lifecycle management solution that can significantly simplify and reduce the cost of managing virtual or private cloud infrastructures. Satellite provides systems lifecycle management  from the physical infrastructure itself to tenant workloads.  It can provision, update, and if necessary retire Red Hat Enterprise Virtualization and Red Hat Enterprise Linux OpenStack Platform hosts.  It can also deploy and configure Red Hat Enterprise Linux guests as opposed to simply provisioning empty virtual machines.

If you have RPM-based workloads, Satellite can be used to provision a virtual machine or instance containing your application to Red Hat Enterprise Virtualization, VMware vSphere,  Red Hat Enterprise Linux OpenStack Platform, or even Amazon EC2.  The inclusion of Satellite 6 in RHCI gives cloud operators and virtual infrastructure administrators greater control of their hosts and provides greater levels of automation for guest virtual machines and instances for tenants.

Satellite provides a variety of other lifecycle related benefits as well including the ability to work with CloudForms to recognize an out of date machine and automatically patch and update it as well as the ability to manage drift using the Puppet configuration management engine.  It can also be leveraged with the Red Hat Enterprise Linux OpenStack Platform Installer for faster deployments and controlled updates to Red Hat Enterprise Linux OpenStack Platform, and detailed inventory and Red Hat Enterprise Linux subscription reporting.

To learn more, we invite you to attend a webinar on November 19 entitled “Building and Managing a Hybrid Cloud with Red Hat Cloud Infrastructure.”  The webcast will feature IDC Senior Analyst Gary Chen and Red Hat Product Manager James Labocki.

Article Source – http://redhatstackblog.redhat.com/2014/11/05/red-hat-cloud-infrastructure-5-now-available/

Prepare for the Red Hat Certified Engineer exam (EX300)

During the 4-day course, students will work at their own pace through the complete set of labs from both the RHCSA (Red Hat Certified System Administrator) Rapid Track course (RH199) and Red Hat System Administration III (RH254). The RHCE Certification Lab course includes a few instructor lectures designed to review key technologies such as systemd, firewalld, and IPv6. For the classroom and virtual classroom versions of this course, an instructor will be available throughout the week to assist students as they work through the labs.
Note: This version of the course includes the Red Hat Certified System Administrator (RHCSA) EX200 and Red Hat Certified Engineer (RHCE) EX300 exams on the final day of the course.

Course content summary

• Managing and troubleshooting systemd services during the boot process
• Network configuration and basic troubleshooting
• Managing local storage, creating and using file systems
• Firewall management with firewalld
• Automating installation of Red Hat Enterprise Linux^® using kickstart
• Manage SELinux settings
• Using NFS and Samba shared filesystems
• Network port security and link aggregation
• iSCSI initiator and target configuration
• Domain Name System (DNS) troubleshooting and caching name server
• Providing Network File System (NFS) and Server Message Block (SMB) file servers
• Apache HTTPD web server management
• MariaDB SQL datbase configuration
• Postfix Simple Mail Transfer Protocol (SMTP) nullclient for servers
• Bash scripting for automation

My tips for the Red Hat RHCE exam

Last week I attended the Red Hat RH300 course (fast track) in Amsterdam and did the RHCSA and RHCE exams on the final day. I passed both RHCSA (283/300 points) and RHCE (300/300 points). I had a great teacher because, apart from technical stuff, I also learned how to approach the exams.

The objectives for both RHCSA and RHCE are well documented on Red Hat’s site. You should start to make sure you know everything inside out. Practise, practise, practise. Learn to use the documentation that ships with RHEL, as this is the only help available: no internet access is provided during the exam. There are several books available that help prepare and Red Hat has very good courses as well, that I really recommend. I assume you should be able to study this all one way or the other.

One advise on this though: don’t try to remember everything but remember the references instead. If you know a man page has examples you can use, just remember the man page. If you know documentation is in a separate package, remember the package name. A references takes less ‘memory’ in your head, so you can remember more. This will speed up your work significantly.

But wait, technical knowledge is just one challenge. Watch out for the pitfalls:

Pitfall #1: Time
Most experienced Linux sysadmins will probably be able to pass the exam if there was no restriction on time. You could test, trial-and-error and read man pages all day long. Even start from scratch when you seriously broke something. Well, it’s time to wake up: in reality time on the exam is (very) limited. And yet many candidates do not manage their limited exam time.

A classic example: spending too much time on something that does not work right away. Instead, accept the fact it doesn’t work now and continue with other tasks or else time will run out. When you have given everything a first attempt, you can always return to a task that you skipped before.

Not only should you know immediately what to do when you read the tasks, you need to know the fastest way to configure something. Yes, the fastest way. Not the way you prefer to do it, or have been doing it until now. I’ve heard people complaining about the GUI/TUI tools. And I agree a GUI is not something you want on a server. But hey, if ‘system-config-authentication‘ has a ready to fill-in form and makes you configure LDAP with TLS and Kerberos in 60 seconds. Why would you want to go for the manual way on the exam? Yet, some feel they are better off configuring this on the command line. There’s simply no time for that approach, nor will it bring in more points. Be smart, take the fast track.

Pitfall #2: Your assumptions
Reading is a big problem because candidates tend not do read very well on the exam. Especially when aware of Pitfall #1, they will not spend the first few minutes reading instructions. A waste of time, right? But in reality this will cost precious time later on because assumptions are made, but never checked. Is it a good idea to start working on something, without seeing the bigger picture?

I don’t think so. Sometimes, tasks are related but not grouped together. When you read everything first, you might find that doing two tasks together is easier. Or you might choose a different approach based on all information, instead on just a single task. Reading ahead helps you understand the bigger picture.

Imagine you are asked to configure, let’s say, NTP. Some assume they have to sync to a time source that is provided and then have to setup a NTP server and serve time to the local network. But isn’t is a waste of time to configure a NTP server, when all you have to do is setup a NTP client? This also occurs with tweaking configurations more than is being asked for. Keep it simple and do exactly what is asked for.

How I avoided the pitfalls
Value your own work through the eyes of a customer. Example: if a web server is perfectly configured but a firewall prevents access to it, then this does not work for a client. Website is down: zero value. Red Hat might also values your work on the exam like this. Keep that in mind.

Structure is another important thing to work on. This was my approach on the exam:

1. Imagine you are working for a client that has written down everything they want from you. Read it all and try to understand the bigger picture. Then reorganize it: group together what belongs to each other.

2. Install everything at once. After step 1 you should have identified all packages you need to install. Do it now. Then ‘chkconfig on‘ every service you will configure later. Why? Because it is easy and it prevents forgetting it later on. Remember: a perfectly configured service that does not start at boot brings in zero points.

3. Then setup the firewall for the services you identified at step 1 and installed at step 2. You probably need to tweak this as you go through the tasks, but just setup the basics now. This will make it easier later on.

On my exam the first 3 steps took less than 20 minutes and provided a solid base to build on.

4. Work through all tasks and remember: Be smart, take the fast track. Also, skip any task that you are stuck on for more than 10 minutes.

Reboot a few times and recheck everything you have finished so far. Your work is reviewed after a reboot anyway, so you should make sure your changes survive a reboot. The sooner you find a problem, the sooner you will be able to solve it.

5. When everything is done, carefully check the items a final time. Then you’re done. And, you probably have some time left!

Article Source - http://blog.remibergsma.com/2013/10/07/my-tips-for-the-red-hat-rhcsa-rhce-exam/