[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x

Linux

65K

Solutions

33K

Contributors

Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.

Share tech news, updates, or what's on your mind.

Sign up to Post

Andy's VMware vSphere tip#25: When creating a virtual machine on VMware vSphere, always try to use the VMXNET3 network interface, which will need VMware Tools installing first! The Intel E1000 interface should only be used when installing an OS. Linux distributions often include the VMXNET3 interface by default, but you will find Windows OS does not include the VMXNET3 interface, so when installing a Windows OS, use the E1000 interface to complete the installation, install VMware Tools and then add a new interface VMXNET3, and delete the E1000 interface. Network interfaces are hot plug!

If you would like to discuss this post further please post a question to the VMware Topic area.
1
Rowby Goren Makes an Impact on Screen and Online
LVL 12
Rowby Goren Makes an Impact on Screen and Online

Learn about longtime user Rowby Goren and his great contributions to the site. We explore his method for posing questions that are likely to yield a solution, and take a look at how his career transformed from a Hollywood writer to a website entrepreneur.

Andy's VMware vSphere tip#11: DNS (Domain Name System) - this has really go nothing to do with VMware vSphere BUT your VMware vSphere Infrastructure is ONLY as GOOD as your WORKING DNS (servers) for your organisation.  So please ensure you get into the habit, of understanding DNS, what it does, and ensure you have at least two working DNS servers, BEFORE you start implementing VMware vSphere. and DO NOT USE IP Addresses for ESXi servers, vCenter Servers, or any other VMware component. Use hostnames, and fully qualified domain names (FQDN) for everything in your  VMware vSphere environment, and this means pen and paper before you start implementing and writing down names of servers and IP Addresses, and then entering A Records for those in your DNS servers., and then check you can resolve those IP Addresses to hostnames, fqdn, and hostames and fqdn to IP Addresses.

Otherwise your installations WILL FAIL!

VMware vSphere is dependant on GOOD working DNS (this can be hosted on Windows, Linux, Unix)

Please see here

https://docs.vmware.com/en/VMware-vSphere/6.0/com.vmware.vsphere.upgrade.doc/GUID-1DD8E69C-4551-4C18-8698-7BFE01BEA8B7.html

If you would like to discuss this post further please post a question to the VMware Topic area.
1
My Recent Experiences with Linux!

As a staunch Windows OS supporter, it's been quite a few years since I've installed a Linux distro for myself to experiment with. Why? The installation process (at the time I experimented last time) was complicated and frustrating, as was just using Linux itself.

So, after reading a few questions and comments here and there, I decided it was time to give it another shot. I first downloaded and set up an Ubuntu Studio ISO in an Oracle VM Virtualbox VM. I was suitably impressed with both the installation and relative (and intuitive) ease of use.

Encouraged by that result, I decided to try another Linux distro called ChaletOS which claimed it would give newbies like me an easier transition to Linux by giving me a familiar GUI interface to Windows 7. Again, I wasn't disappointed. Linux distros have indeed come a long way since I last experimented.

Installation was an absolute breeze and puts both Windows 7 and Windows 10 installers to shame! Ease of use? Fantastic, especially with the ChaletOS build. I think I'm starting to understand why Linux tends to have such a 'cult' type following.

I've still got a lot to learn and experiment with, but my first impressions are nothing but positive. If you're in a similar position to me, I'd encourage you to give Linux another try. By setting up in a Virtual Machine, you have nothing to lose and potentially, much to gain.

Cheers...

Andrew
1
LVL 107

Expert Comment

by:John
Interesting discussion. I always encourage people to use what they like. Businesses tend to adopt Windows and I have businesses with that.
0
LVL 46

Expert Comment

by:noci
Some businesses do, other use other software that requires yet other systems.
My daily bread comes from running OpenVMS environments.( 99.999+ uptime requirement RTO = 15minutes max total per year planned or unplanned).  Quite different specs. And some Unix clusters almost the same requirements, slightly more relaxes max 1 hour of outage a year, that predict arrival times of busses & light rail trains at  (~60,000) stops with a continous update from vehicles. with announcements on each stop for the next 3 vehicles.
(and about 6 stops ahead of a vehicle).   Somehow windows is not even considered to be remotely an option for those environments.
0
Any Idea for taking the thread dump from Application which has been deployed in JBOSS server. I have tried the below option and its not capturing

1. Kill -3 <PID>
2. kill -QUIT <PID>
3. Tried with javadump.exe and jps -l. But no use.

Note: Since I am developer I have tried with ThreadMxBean and it doesnt work existing application and more over I don`t have multiple options to do in Linux Machine. if any one is providing the idea which helps me to generate the threaddump for the existing application.
0
LVL 23

Administrative Comment

by:Andrew Leniart
Hi Asif,

What you have done here is made a "Post" which is used to share information you think would be of interest to the Experts Exchange community.

In order to get help with a technical problem from the experts, please use the "Ask a Question" feature of Experts Exchange.

It's the big blue button at the top of your browser when you are logged in to this forum.

I hope that's helpful.

Regards,
Andrew Leniart
EE Topic Advisor
0
When a customer asks you for something try to your best to understand what exactly he wants to accomplish and not really on what he says he wants, be clear with him what this will be used for before you make a recommendation, take your time, and discuss. for example a client ask me for a NAS drive so he can have all file in his office in a central location and all his staff can access it. Then he calls up that he moved his quickbooks file to the NAS drive and quickbooks does not work, of course it does work, quickbook needs its network manager installed in the same place where the file is and the network manager is a windows based application not Linux. Then he wanted his ticketing program file on the NAS, again sql is not supported on a Linux, would I know more details I would recommend him one model higher than the one I gave him which support a vm where he would be able to have a window machine on.
1
LVL 46

Expert Comment

by:noci
hm. does it support iSCSI?, then you can store data on the NAS while the processing is on one "server" outside of the box...
Sometimes  think out of the box.
0
1
LVL 20

Expert Comment

by:Lucas Bishop
Really have to tip your hat to the developers who do game dev for *nix. I'd think the dev investment would be significantly higher than the potential return.
1
LVL 12

Author Comment

by:Brandon Lyon
Linux games are seeing more investment lately. All of the major game development engines support Linux. As long as a developer makes sure their toolkits support multiple platforms it becomes fairly easy to support Linux. I've also heard developers mention that developing cross-platform games on Linux can decrease bugs on other platforms. It helps that companies like Android and Nintendo have Linux based OS and a large target audience.

Sometimes the Linux version is cost-prohibitive to implement but other times it works out alright, especially since Linux gamers are typically starved for good games.
0
Solving the C10K problem with Linux + Apache + MariaDB + PHP + WordPress.

Just went through several days of tuning a new client's site running 50K-100K page requests/hour. Insane levels of traffic.

This surfaced problems in PHP + WP Super Cache. Bugs opened in both projects showing how to reproduce problem.

After all's said + done, site can now handle 10M visits in 9minutes. You read that number correctly. 1M+ reqs/sec sustained traffic out of WordPress.

So when someone tells you WordPress is slow, they're wrong.

What they should say is, something... somewhere... in the configuration of their entire LAMP Stack + WordPress setup is slow + likely fixing some minor setting somewhere will heal their site to run massive traffic.
0
hi
 it could impossible to work in our environment if we develop app.
Our new plateform need to be in Linux Debiian,


And to do it, we do a Worktation Linux environment with vmware;

And idea is to make a VM by service.
Example : 1 vm for LDAP, 1 vm for NFS, 1 vm for DNS, 1 vm for DHCP, 1 vm for Shared files, 1 vm for Samba...

And at the end, it ll push by Ansible. We'll make this with that if it's not possible to do it normaly,

so i work with Workstation with Linux Debian
0
2
I've been using phantomjs to convert HTML pages to PDF.  On my Mac, everything was OK.  But, on a Linux environment, the fonts were not rendering properly (particularly web fonts).  There isn't too much out there on this problem, until I finally stumbled upon this github issue: https://github.com/wkhtmltopdf/wkhtmltopdf/issues/45.  (Apparently, the workaround found for wkhtmltopdf also applies to phantomjs).  Anyways, the fix finally ended up to be creating a new file (/etc/fonts/conf.d/100-smoothfonts.conf) with the following contents:

<?xml version='1.0'?>
<!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>
<fontconfig>
 <match target="font">
  <edit mode="assign" name="rgba">
   <const>rgb</const>
  </edit>
 </match>
 <match target="font">
  <edit mode="assign" name="hinting">
   <bool>true</bool>
  </edit>
 </match>
 <match target="font">
  <edit mode="assign" name="hintstyle">
   <const>hintslight</const>
  </edit>
 </match>
 <match target="font">
  <edit mode="assign" name="antialias">
   <bool>true</bool>
  </edit>
 </match>
 <match target="font">
  <edit mode="assign" name="lcdfilter">
   <const>lcddefault</const>
  </edit>
 </match>
</fontconfig>

Open in new window


Just throwing this out there in case someone else has the same issue and stumbles upon this post!
6
LVL 16

Author Comment

by:Phil Phillips
Yeah, I'm using the screen capture ability of phantomjs.  Supported output formats are png, jpeg, gif, pdf.  The phantomjs download page has binaries for the major OSes. Their git repo has a script called "rasterize.js" that I've been using to do the capturing.  Sample usage:

phantomjs rasterize.js https://www.experts-exchange.com ee.jpg

Open in new window

1
LVL 7

Expert Comment

by:Brian Matis
Sweet, thanks Phil! I'll have to give that a try.
0
CompTIA Cloud+
LVL 12
CompTIA Cloud+

The CompTIA Cloud+ Basic training course will teach you about cloud concepts and models, data storage, networking, and network infrastructure.

How to get cpu serial number in linux from cmd
0

Expert Comment

by:Ole-Aleksander Forchhammer
What distribution of Linux are you running?
0

Author Comment

by:Enhance Technology
CentOS release 6.8 (Final)
0
Warning: If your device uses WiFi, it's at risk!
News broke today about the Krack Attack, a new cyber threat that can decrypt and potentially view everything users are doing online. The Krack Attack preys on a weakness in WPA2 protocol. Hackers near the vulnerable devices (Android and Linux are at greatest risk) can retrieve sensitive user data and information.
Steps to Protect:
1. Apply patches as they become available. For phones and computers, the patches will come in the usual update format. For wifi routers, the manufacturer's website will have the patches.
2. Don't use public WiFi, especially for sharing or sending any sensitive information.
3. Double check that you are browsing with HTTPS. If you are unsure, install this plug-in to encrypt your communications with major websites and make your browsing more secure. https://www.eff.org/https-everywhere
4. Otherwise, use Ethernet.

For more tips on how to protect yourself: https://techcrunch.com/2017/10/16/heres-what-you-can-do-to-protect-yourself-from-the-krack-wifi-vulnerability/
5
I have a cpanel based linux hosting a/c for my domain. I want to set a cronjob which will run to delete 6 months old emails automatically from the INBOX of all the email users everyday at 8 pm. Can someone provide me the cron command.
0
linux email relay has stopped working

in the log it reads
Oct  9 07:46:15 culser postfix/smtp[18330]: 21FE619C627: to=<circleconect@gmail.com>, relay=smtp.rcn.com[69.168.97.78]:25, delay=0.44, delays=0.03/0.01/0.26/0.15, dsn=5.7.1, status=bounced (host smtp.rcn.com[69.168.97.78] said: 554 5.7.1 [P4] Message blocked due to spam content in the message. (in reply to end of DATA command))

the relay i am using in postfix is the smtp address. i am getting a 554 error apparently. i pay for IP service thur them but they say they have no restriction. maybe it is a setting in postfix s

i need someone's advise who has knowledge of Linux, postfix, relays, and email servers.
0
LVL 11

Expert Comment

by:Prabhin MP
I HOPE YOU GOT THE ANSWER
0

Author Comment

by:culser
yes it now works.
0
Hi friends, My name is SERGE
I have a little worry. This concerns the installation of zimbra messaging under SUSE LINUX ENTERPRISE SERVER ...
I would like you to give the manual and the controls so that I can install it artificially ...
thank you in advance .
0
LVL 27

Expert Comment

by:Brian B
Hi Serge. This entry you have made is a POST. In order to get an answer from the Experts, you should probably make it a QUESTION. Use the "Ask a question" button above or this link: https://www.experts-exchange.com/askQuestion.jsp
0
Dear Experts,

I'm about to install Oracle Weblogic Server for the first time, I'm looking for your recommendation before strating the implementation even if on the OS level if you have any concerns please inform me so I can finish the job perfectly as my company will depend on me to finish it, I'll use subscribed RHEL v6.8 on HP proliant DL580 G7
1

Author Comment

by:MOHD HOSNI
Thanks Brian B for your notice, I already did that earlier but actually this is the first time to use the app and I already got it.
0
LVL 27

Expert Comment

by:Brian B
Great.
FYI: For those who can help with the question, please go here: https://www.experts-exchange.com/questions/29058716/Oracle-Weblogic-on-RHEL.html
0
Here is a tip for faster linux software updates: make sure your software sources mirror lists are ranked and optimized. The link below explains how to do that with Arch based distros like Manjaro.

https://wiki.manjaro.org/index.php?title=Pacman_Tips#Ranking_mirrors
0
Addition of native Linux support in windows is really amazing..
4
LVL 7

Expert Comment

by:Brian Matis
Yeah, I'm really liking the much more open direction that Microsoft has been taking of late. Very different from the old Microsoft, and a very welcome change!
0
1
The 7 Worst Nightmares of a Sysadmin
LVL 1
The 7 Worst Nightmares of a Sysadmin

Fear not! To defend your business’ IT systems we’re going to shine a light on the seven most sinister terrors that haunt sysadmins. That way you can be sure there’s nothing in your stack waiting to go bump in the night.

2
This is a good approach to teaching. Start with simple questions about how to reach an end goal. From "how do I install the operating system" to "how do I install Minecraft?"
5
LVL 7

Expert Comment

by:Brian Matis
Nice! I know the main reason I got into using computers was so that I could play games. Next step will be for them to start learning how to build simple games :-)
1

Expert Comment

by:Daniella Barion
It's great to see parents involvement trying different ways to have kids attention and interest.
1
https://www.pine64.org/?page_id=3707

Have you worked with a Pinbook for surfing or other?
2
LVL 12

Expert Comment

by:Brandon Lyon
I thought about getting one back when they announced it. I decided to wait for reviews mainly because I was unsure how good (or bad) the screen and keyboard might be. That and other options are getting ridiculously cheap.
0
LVL 53

Expert Comment

by:Jackie Man
According to its spec, PINEBOOK is similar to a Raspberry Pi 3 and it may be the reason why it can be made so cheaply.
0
If you ever want to play bash on hard mode, install suicide linux. It sudo rm -rf / 's your machine if you mistype any command.

https://qntm.org/suicide
3
LVL 7

Expert Comment

by:Brian Matis
Well, I guess that's one way to train yourself to be more cautious about what commands you're typing!
0
LVL 16

Expert Comment

by:Phil Phillips
Haha, reminds me of: https://xkcd.com/1168/
2
2
LVL 20

Expert Comment

by:Lucas Bishop
desktop apps on a mobile device and not the other way around

Aren't we heading into the realm of apps not being so device centric? ie. Adobe Creative Cloud, Google Apps, Office 365, etc
0
LVL 12

Author Comment

by:Brandon Lyon
That is one direction. Personally I want offline access to non-webapps developed with a desktop UI in mind. I dream of having a VM webserver running in my pocket which I can cast to any screen and input devices I want. It would be nice if that were also my phone so I wouldn't have to carry multiple devices. Right now I still need at least two devices for that. I am getting a new GPD Pocket netbook I can carry around with me but I will have to use my phone for calls and internet access. If I could get a 6" phone that does (allthethings) then I wouldn't need two devices. I briefly debated getting the Gemini PDA but that is a bit smaller than I want and is coming from an unknown company with no track record.
0
Just found out about the command vimtutor. I use vim a lot for work and feel fairly confident in it, but I didn't know some of the stuff that vimtutor goes through. I had a teacher in college tell us to become vim power users all the time. Not sure what versions of linux have this installed, but it worked on amazon linux.
3
LVL 16

Expert Comment

by:Phil Phillips
I'll have to check it out.  Always nice to learn some new vim tricks :).
1

Linux

65K

Solutions

33K

Contributors

Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.