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The most popular Services mentioned in /r/redhat:
Fedora
VirtualBox
Linux kernel
OpenShift
O'REILLY Safari
Vagrant
Funtoo Linux
CentOS
Amazon Web Services
oVirt
Apache Guacamole
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SystemRescue
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The most popular reviews in /r/redhat:
Download CentOS, it is essentially RedHat except for a few Red Hat specific things like subscription entitlements and the like. The nuts and bolts are exactly the same.
http://www.centos.org/download/
I assume you are looking into the RHCSA? There is nothing in that your wont be able to learn through using CentOS.
I've mentored several Junior linux team members and I always recommend : https://www.amazon.com/UNIX-Linux-System-Administration-Handbook/dp/0134277554
While not RH specific, it is has a wealth of information on Linux in general and serves as a good reference.
For web load balancing, you need to set up a reverse proxy. The reverse proxy will direct web requests to back-end nodes that will respond to clients directly. The balancing method and node weighting are configurable, and there's no need to make each back-end web node HA/fault-tolerant. Build the reverse proxy machine to be HA and you'll have your bullet-proof load-balanced web cluster.
Since we use VMWare here, I just have VMWare handle the fault-tolerance of the reverse proxy host. That way, there's no need to mess with Linux-level fencing, state syncing, etc.
Fuckme, I figured it out. This line right here is your problem:
# grep repo virtualbox.repo repo_gpgcheck=1
That means that even though you have the GPG key imported, it's still going to run a gpgcheck on the repo metadata. From the yum manpage:
> repo_gpgcheck - Either '1' or '0'. This tells yum whether or not it should perform a GPG signature check on the repodata.
Now, if I change that to a '0' and then do the 'rpm --import' shenanigans, it doesn't prompt:
# grep repo virtualbox.repo repo_gpgcheck=0
# rpm -e --allmatches gpg-pubkey-98ab5139-4bf2d0b0 # echo $? 0
# rpm --import https://www.virtualbox.org/download/oracle_vbox.asc # echo $? 0
# yum install VirtualBox-5.1
<snip>
virtualbox/7/x86_64/primary | 7.8 kB 00:00:00
virtualbox 26/26
Resolving Dependencies
<snip>
Install 1 Package (+18 Dependent packages)
Total download size: 77 M Installed size: 171 M Is this ok [y/d/N]:
The number of times I've booted a system over the years with System Rescue CD and mounted/chrooted in to fix stuff is... far too many.
Hell, sometimes I do this to VMs!
Congratulations. I obtained a RH learning sub and hoping to get to that level before it expires. I got a RHCE once back in 04. Looking to finally get do all three RHCSA, RHCE, and RHCA with a focus on OCP management. I already use ansible to do offline installs of OCP which is a beast in and of itself. I see others and you have mentioned podman instead of docker. There pretty much the same thing as I understand it and just dropping the docker REST API as the industry moves to the OCI model using gRPC.
Yes, there are TWO RHCSA courses on Linux Academy. Both are aimed at RHEL7, which is fine for most of RHCSAv8, but the shorter course has an added section at the end about some (but not all) of the RHEL8 specific topics.
One tip for Linux Academy, watch both courses at 1.25x speed to save a few hours.
In conjunction with the Linux Academy courses, get this book! https://www.amazon.com/Red-RHCSA-Cert-Guide-Certification-ebook/dp/B08171QYYJ
Only $20 for the ebook version, this book covers everything and covers it well. It's also written so you can easily just jump around to the specific sections you need review on. It also has practice tests.
Last tip, I can't share a link right now cause I'm out, of you search you should be able to find it, but there is a Slack channel specifically for RedHat certs, which has a practice exam, a community you can ask questions, etc. One thing I found most useful there is they have an Ansible/VirtualBox/Vagrant based "practice environment" you can download which, in a few commands, will automatically set you up with a couple of local RHEL8 VMs to go wild on.
In Virtualbox, just add 2 NICs to each VM that are "Internal Network" types between two VMs. Just statically setup the IP addressing between the two hosts. Each other is the other's gateway. No DNS.
https://www.virtualbox.org/manual/ch06.html#networkingmodes
I just did it the other day and was able to run a load balanced config between two VMs of team'ed internal network NICs.
You have two options: build or buy.
If you choose to build, you just need a machine with enough beef to host several simultaneous VMs. Not sure about your work situation but any modern server (HP DL380/DL570) can easily host it with enough memory. How much memory? Enough for each VM + 2-4 GB left for the OS, ideally. Sixteen GB is plenty and any modern server will probably be built with more than that anyway.
You can also build a PC - any modern CPU with virtualization opcode support will work. One of my employees built an i5 system and that was probably overkill. You just need a reasonable amount of memory. You don't need more CPUs (or hyperthread cores) than you'll have running VMs because let's face it - you aren't going for performance here, it's just to learn how things work together. The last Redhat class I took had an i5 Thinkpad laptop if I recall correctly.
If you decide to just rent server space it's doable but gets pricey quickly. To rent a server with 8 GB memory at digital ocean is $80/mo. Check their pricing [here]. A few months of that will buy you a PC. If you do decide to go with DO, don't forget they charge for every minute your server is provisioned, not running.
Having said that I have a $10/mo DO droplet so I can get cheap butt-in-seat team with CentOS 7. It's too small to build virtual machines but a couple of those will let you do most anything else like build filesystems and share them using ldap, kerberos, samba, etc.
That is because iptables.service is not installed:
[root@i5207r ~]# systemctl mask iptables.service Failed to execute operation: Access denied [root@i5207r ~]# yum install iptables-services [root@i5207r ~]# systemctl mask iptables.service Created symlink from /etc/systemd/system/iptables.service to /dev/null.
Take steps to go from being a user to being someone that understands how it works. I did Linux From Scratch many years ago and it was eye-opening.
More specifically, figure out what areas are interesting to you and dig in those places. Don't be afraid to break things. :)
oVIrt provides centralized management of multiple hypervisor instances and provides "Enterprise" capabilities such as High Availability, advanced resource scheduling, and centralizes enterprise storage, networking and authentication. If you're literally looking to simply run a hypervisor on a single host, KVM with Virt Manager may be the simplest path forward.
Within its architecture, oVirt communicates to a Host Agent (VDSM) on each hypervisor. The VDSM, in turn, leverages the underlying KVM/libvirt capabilities of the hypervisor host. oVirt sends commands to these individual VDSM agents on each hypervisor to provide the centralized management capabilities. It's an additional layer that is unnecessary if you aren't running a multi-host setup.
oVirt Quick Start Guide is the first place to start to get up and running. This will define the terminology used in oVirt and would enable you to compare that to the ESXi/vCenter terminology. The concept of Storage Domains is a slightly different approach than VMware storage, which is where most are likely to get tripped up on first setup.
RHEV Docs go quite a bit deeper than the oVirt documentation, but is very specific to running RHEV on RHEL vs other Linux Distributions.
The IRC channel is #ovirt on irc.oftc.net (I'm sherold there)
> What I really wish is that Red Hat had its own complete cloud offering. The cloud is the long term future. The hybrid and on-premise cloud technologies will become more and more of a niche' market as time goes on.
What's OpenShift Online, but a cloud offering?
https://www.amazon.com/Red-RHCSA-Cert-Guide-Certification/dp/0135938139
Same author does the RHCE 8 book too. If you are on a budget, check out z library.
I passed the RHCSA last night. I used the O'Reilly RHCSA courses exclusively. You can get an O'Reilly subscription for $50/mo and if you really buckle down you can easily finish the material more than once in a month. I watch everything at 1.5-2x speed and take notes, then repeat. It has practice labs in each section as well as a full practice exam at the end. I also read the Ghori book but that was >1 year ago so I don't know how much it directly helped in passing the exam. I have been using Linux since the 90s, but everything you need to know to pass the test is in the videos.
I am trying to study for the RHCSA and have a few digital books already that serve to facilitate that goal. I have been looking into getting one in physical form so I won't be tied to a screen. Having had no experience with any of the ones listed on amazon except the one by Miguel Colino, I was just wondering if it would be worth it to wait for the one by Yang that comes out in September or just fire away on the Ashgar Ghori one from late 2020 and fill in whatever gaps are present from updates to the material over almost two years? Are previous editions of this book even good?
Another option - I'm using Sander van Vugt's material to study, & when I find something that I don't have pretty solid knowledge about, I'm adding that to my Anki flashcards.
In addition to my own notes, there is also at least one set of RHCSA flashcards that are already put together - (I just found these in a search, I don't know anything about them).
I hope this helps you.
It seems pretty significant for a few reasons, though none of these are certain
Inclusion in Red Hat means corporate acceptance of a new technology (and therefore revenue)
Competitive attack on VMWare and heavyweight virtualization in general (or evolution or complementary tech depending upon your POV and background). Probably also on .deb based distributions - or at least a good defensive maneuver
Possibly a key packaging technology for distribution of software stacks (not discrete components) -e.g. middleware or anything running in a paas. http://www.zdnet.com/heres-how-microsoft-is-supporting-the-open-source-docker-container-model-7000030393/
It will be interesting to see how that technology is adopted in other parts of Red Hat
> I am have no way of practicing at the moment
Sign up for this and install into something like VirtualBox - for what you're doing, even an ancient laptop should be able to serve. You'd only need 1 virtual CPU and 256-512mb memory to practice with this.
Sorry, my last response seemed short. I was on mobile. If youre asking what games are available, checkout protondb or lutris' website.
You might try contacting customer support about your issue. If their videos, etc aren't working properly they need to know that otherwise people won't buy RHLS anymore. They may just not be using a CDN for the videos or something. Either way they're probably depending on people letting them know.
In the mean time you might try Safari Online's videos. They give you a free trial period which might give you some stuff to learn about. A lot of the RH courses are pretty good though (especially the microservices-related or the Exam-oriented ones) so Safari online would be more something you do as a filler until the video issues get worked out.
I did see Sander van Vugt has a preview of a training course for the EX342 exam posted on Safari Books.
https://www.safaribooksonline.com/videos/linux-troubleshooting-red/9780135207598
I've generally found his videos to be helpful in preparing for exams, though I can't vouch for this one since I haven't used it. I relied on the official Red Hat training provided through my employer to pass this exam.
There is a mountain to climb if you want to become a Linux guru. However, if you want to become proficient in Linux, learn the fundamentals. They'll get you most places you want to be. Use CentOS if you want to save money, as it's a binary compatible, free redistribution of Red Hat Enterprise Linux. Install VirtualBox, setup a simple CentOS VM with a bridged network adapater, and have at it with some tutorials like this:
https://www.funtoo.org/Linux_Fundamentals,_Part_1
Now go get messy and break stuff. It's just a VM, after all!
Might be worth checking out "Keychain" from Gentoo that solves some of the hazel of using proper private keys with pass phrases while scheduling tasks. YMMV
There is a project called Tripwire that will monitor system files and changes if that is what you are angling towards. https://github.com/Tripwire/tripwire-open-source
It is available in EPEL.
Otherwise are you just looking to get a recursive list from /?
(Sorry for the late reply) Do you use EFI boot or legacy? We use EFI for all our Dualboot workstations, and I build refind, which has the capability to boot into particular boot entries at certain times.
Well... just looking at something like the kernel the last LTS was 3.10 (RHEL7). Therefor it would be a conservative guess that RHEL 8 would be based on 4.4 (already ~2 years into it's support window) or 4.14 (the current Fedora 27 LTS kernel). I would guess a beta would take at least a few months to import from F27 if it was decided to go that way, so maybe 2018?
I just downloaded and tested it.
It's a live cd image you write to a usb flash drive.
I'm just wondering about field of view of the webcam, I'm not sure whether any webcam will do or there is an expectation here. Like is a 75 degree fov do or does it have to be 90?
Download fedora media writer here
I just mirror the repos over to my offline network and do normal yum installs.... did you look here? https://www.videolan.org/vlc/download-redhat.html
Use the man pages for any command you want specific instructions on. Everything is typically very well documented in Linux. For questions like "how do I ___?", google is usually pretty effective (stackexchange turns up frequently).
Edit: forgot http://explainshell.com/
If possible, it should be preferable to use tshark (wireshark's terminal variant) as it supports pcap-ng out of the box.
This gets you finer timestamp resolution than pcap, which can be useful.
While it's bundled in the wireshark package, you'll find it doesn't depend on any GUI libraries or X.
So my 2 cents here is that CI/CD is the next step. There isn't much an interim between. CI/CD is usually what merges whatever code you want to push with podman commands to build the resulting container. A lot of the clients I deal with are using Jenkins and on the open source side Concourse. https://concourse-ci.org/
You should probably read this document which explains the internals of openshift.
https://www.openshift.com/blog/whats-inside-openshift-4
OpenShift hasn’t used Docker since 3. In openshift 4, it uses CRI-O and runc.
OK, well if you're not limited to government services then you can find a fairly comprehensive list of public references here.
In terms of public facing services, HCA Healthcare, BMW Connected Drive, Cathay Pacific, and British Columbia are all things that might fit the bill.
Assuming you're working on this with a Red Hat Account Team, you should contact them if you wish to have reference calls with existing customers.
If your site is stateless (or keeps all of the state in the back-end database), a simple round-robin DNS entry can suffice. If not, you'll need some form of a load balancer/reverse proxy. If the heavy lifting part of your web application is tomcat, here's a guide for how to have a single apache head, but allow it to farm the application serving out to a cluster with mod_jk. http://www.tutorialspoint.com/white-papers/load-balancing-and-scalability-via-tomcat-clusters.htm
FreeOTP is a two-factor authentication application for systems utilizing one-time password protocols. Tokens can be added easily by scanning a QR code. If you need to generate a QR code, try our QR code generator.
FreeOTP implements open standards: HOTP and TOTP. This means that no proprietary server-side component is necessary: use any server-side component that implements these standards. We recommend FreeIPA.
FreeOTP is sponsored and officially published by Red Hat. Pull requests on GitHub are welcome under the Apache 2.0 license. Feel free to review our privacy policy.
Something I've switched to rather than dual-booting my home PC is using VirtualBox and vagrant (for quicker instance creation/modification). Also, there are pre-made vagrant boxes where centos/rhel is already configured to a certain point so it is great for when you just want a virtual machine that you can access in less than a few minutes for quick lab work or just for testing out something (yum package management, spin up Apache or tomcat or somet application and break it without worrying of doing something harmful to your desktop).
https://www.vagrantup.com/downloads.html
It's also perfect for when you take course (RedHat or otherwise) and need lab machine (or machines) and you would prefer it to be more local than in the training cloud setup.
Local virtualisation is oke either way. I've had positive and negative experiences with both.
But also have a look at other projects e.g. https://www.vagrantup.com/ and https://github.com/kimchi-project/kimchi/wiki
I got this camera. The autofocus works well, 1080p resolution, and doesn't seem to need any special drivers. Works perfectly on Fedora 32.
Has anyone used this book, what did you think?
by Asghar Ghori (Author)
Thanks,
I never studied for the rhcsa7 so i dont know what the differences are.
There is study material out for RHSCA8 Link to Sanders rhcsa8 book - this is all i used
Platform and tools are listed in my original post.
Can't get into specifics: These are the published objectives for the EX300 concerning what you are asking:
NFS
- Provide network shares to specific clients
- Provide network shares suitable for group collaboration
- Use Kerberos to control access to NFS network shares
Looks like the first object speaks directly to what you are trying to do. As it is an objective, it can be on the exam.
I can also say that as an instructor for taught the RH254 class (the EX300 material), the files you are trying to manipulate (idmapd.conf and /sys/module/nfsd/parameters/nfs4_disable_idmapping) were not in the course content.
Neither were some of the options you are trying to use in your exports file.
Pick up Michael Jang's book (seventh edition). As the EX300 is on its way out, you can get it for under $20:
I'm just wondering if I pick up a cheap webcam from amazon or something.
What Michael Jang book are you guys referring to? Is it this one?
Red Hat RHCSA/RHCE 7 Cert Guide: Red Hat Enterprise Linux 7 (EX200 and EX300) (Certification Guide) https://www.amazon.com/dp/0789754053/ref=cm_sw_r_cp_apa_iKXFAbWY8CJKH
Sander Van Vugt has a great book that covers rhcsa and RHCE. I used them both to get my RHCE. Not really for beginners. You'll have to do a lot of researching to figure things out not covered in the book. Also plural sight is great video site with some Linux trainings. Linux academy is a great resource too but I think it's a bit pricey after the trial ends.
I took both RHCSA and RHCE without taking the official Red Hat training courses, if that's what you mean. It would probably be very difficult to pass either of them without using any training resources, though. Jang's book should be sufficient, I think, if you're comfortable studying on your own.
check mojo for vmcore stuff. should be several vmcore tags you can search for. i believe i remember The Linux Bible going into great detail about the boot process. Written by Chris Negus.
Do any of you guys have recommendations for practice exams? Where to get some? I found this https://www.amazon.com/RHEL-Practice-Papers-RHCSA-Answers-ebook/dp/B016X065Q8/ref=sr_1_1?ie=UTF8&qid=1481153413&sr=8-1&keywords=RHCSA+7+practice+exams, but it's only on Kindle which I don't have.
It covers 'way' more then the RHCSA. Good reference manual.
Congrats, what did you use as your lab book? If I'm not mistaken Jang's book was released, but his lab book comes out in a month or two.
Here ya go. Are you maybe looking at the version with the vm's included?
You need to be more specific,
*what have you tried so far? *which ISO have you used to install CentOS? *what exactly are you having problems with?
http://certcollection.org/forum/forum/81-linux/ is very good for training and learning what you need to know.
This is usually considered the best book for RHCSA for CentOS 6
Please take a look at these resources. They have been outstanding so far!
http://www.rhatcertification.com/
He has a complete video course (~$150 with discount)
Sander also has a partially completed book (pdf) for RHCSA/RHCE costing only $16 and will provide updates.
His book IS going to be published and can be pre-ordered (~$40) on amazon.com = http://www.amazon.com/RHCE-RHCSA-Cert-Guide-Certification/dp/0789754053/ref=sr_1_1?s=books&ie=UTF8&qid=1420367281&sr=1-1
The video tutorial is great! I signed up for the lab environment and contact hours. I'll be starting that in a day or two after registration is completed.