Category Archives: RedHat and Friends

Auto Added by WPeMatico

Deploy Large Stacks Easily in ANY Cloud with Juju

First, a lot of people will ask, “What is Juju?”.  I had also not heard of it; however after using it, I can say it is an amazing piece of software.  It is made by Canonical, and this is their description of it:

“Juju is a state-of-the-art, open source modelling tool for operating software in the cloud. Juju allows you to deploy, configure, manage, maintain, and scale cloud applications quickly and efficiently on public clouds, as well as on physical servers, OpenStack, and containers. You can use Juju from the command line or through its beautiful GUI.”  

Essentially, JuJu makes deploying large, complicated, and difficult piece of software a breeze.  It also has a great GUI, and CLI tools.  It also supports many clouds as you can see below. 

I am currently testing this for my use case.  However, if you have to manage several clouds/customers/etc, it has the potential to save tons of time from an operational perspective.

 

Want to install it? Super easy on Ubuntu via a SNAP:

sudo snap install juju --classic

This will setup a new controller on your system behind a NAT’d interface.  It will then walk you through the setup.  Also, I highly recommend a run through of the install documentation; especially if you are going to run it on your own hardware; or localhost (LXD).  Recommended for ‘easy’ setup are the following: Ubuntu 18.04+, LXD, and ZFS (if on your own servers). ZFS is highly  recommended by myself for many other reasons we can get into later, see ZFSonLinux.org.

How to use a PS1 in Linux/MAC

Here are the PS1‘s I use for my daily driver.  Feel free to take them and change them up.

I use different colors, so one doesn’t accidentally login or run something as root (which is in red, users are yellow).

To use these, simply copy and paste them into either the root user; or regular user’s .bashrc.

Alternatively you can add them to /etc/profile to make them enforced system wide. 

For MAC, it is the same; however the PS1 is a little different. See below.

 

Root

 

User

Using Nano with Markdown in Linux

Fan of nano?  Like having pretty colors to see where you messed up? Of course we do!  Much like many of us, I use nano.  Its quick, easy, and readily available.  However, I like to see the highlighting of my language.  As many of you know, there are “nanorc” files, that will tell nano how to handle language highlight.

They are usually located in  /usr/share/nano/ (at least in ubuntu); and you can make your own under your home directory with a .nanorc file.  I can post about that later…

For now let get markdown working in nano!

You will need to create a file called markdown.nanorc by doing the following:

 sudo touch /usr/share/nano/markdown.nanorc

Now that the file is created, we just need to populate it with the following below text, in a pastebin for your convenience.  Just copy that text, and paste it into the aformentioned file. Once a new session is started, you will be able to start using markdown.

https://pastebin.com/raw/tHkBqdef

Just a little note as well; if you have a need for another language, you can follow the same instructions with their pre-reated files.  Take a look here, to see other nanorc files.  Also, nano has just been updated after a very long while, please take a look at the new support when you can.

 

 

 

Don’t forget! Linux Learning Resources

This is kept under the Linux Learning Project and Learning Resources section of the site, and is updated occasionally with new links.  Feel free to suggest one by contacting me directly.


LEARNING RESOURCES

Help/Chat:

Resources:

Need DevOps Help?

  • Had issues with your DevOps pipeline?
  • Need help streamlining automation or configuration management?
  • Need to green field or “lift and shift” applications into the cloud?

If you are trying to do any of these, and running into issues please contact me.  I am now open to consulting directly.  Fixing even a few small inefficiencies can have a huge impact on the bottom line.  Not only that, if the DevOps philosophies are really taken up, its likely that the employee base will also be happier, and proud of their accomplishments as a team.

As far as technologies I support, please take a look at my Technologies page.  (Updated often)  I am also happy to take on new ones for a project if needed.

Creating an efficient pipeline is what I do; and a fully functional system that is working well can be an amazing thing.

 

Matthew Curry
MattCurry.Com

 

The Eagle Has landed….

All,

I have made it…. the move is complete!   I just wanted to say thank you for everyone that has been waiting on me.  I know I have taken a while on a few things, and I am finally in a position to run with everything again.  I finally have a decent internet connection [330mbps/330mbps]; so I will also be able to host things at high speed for us now as well.

As far as the installer goes, I hope to be done very soon with it ;  I am putting my final touches on it for the Pixel desktop.  If I get time I might be able to get Bluetooth working!  However, I have to get caught up first.

For those waiting on hardware, most has been shipped with a few exceptions.  I have notified those people.  I have a true ‘shop’ area again, and this will allow me to be much more efficient.  Meaning shorter wait times/etc…

 

Sincerely,

-M

A few BASH tips from an old Linux admin.

Everyone has seen these “Top 50 commands” blah blah blah….. #clickbait….

I am writing this just to make BASH a much more pleasant experience for people new and old to Linux.  It is also for any sysadmin that has simply not been introduced to some of them.

I could list tons of them, but that’s going to get a simple TL;DR for most people.  Then they will move on.  So I will list a few and lets let those digest.  Keep in mind all commands are in Linux, and may vary by distribution.

First BASH tips (Simple, but time savers):

  1.  Type ‘cd’ and you will go to your home directory for the user you are logged into.
    1. Similar to “cd” ~, however ~ can sometimes rely on the environment.
  2. To return to the previous directory you can type ” cd -“.
    1. This will return you to your previous location, not home.
  3. Type “tailf”, instead of “tail f” for the same results.
    1. Also, “tail -200” can be used instead of “tail -n 200”
  4. Use a custom “PS1” for root, and regular users.
    1. A “PS1” is the text in the login prompt. See Example to the right:
      1. Notice it is yellow
      2. Do the same but in red for root.
    2. Examples:
      1. Debian PS1 for a normal user (as seen to the right)
      2. Debian PS1 for a ROOT user.
        1. These will need to be added to the bottom of “.bashrc” in your home directory
        2. Keep in mind files starting with a . are hidden in Linux, but there.
          1. I also have MAC PS1’s public in my gists.

 

I think that is enough for today, I hope this helps make BASH your friend.

 

-M

12 Years without Microsoft and loving it!

As of April, 2004 I stopped using all Microsoft products.

For many reasons. I know people like to debate about microsoft products. However, for me its not a debate.

Examples [Just a tiny bit]:

  • If I was a contractor and came into your company and said, “I am going to record all your keystrokes, and put them on my server every 30min”, you would laugh me out the door. Especially in software, where the source can be recreated from the key logs.  Well, Microsoft does it.
  • If I was a contractor and came in to your company and found a security bug, and then sold it on the black market making you vulnerable before there is a patch to hackers.  You would probably sue me; and maybe even press charges of some kind, as it can put you out of business.  Well, Microsoft does it.
  • If I was a contractor and came in during the night and upgraded all your desktops to an OS you haven’t tested… well I think you get the point by now…
  • UEFI – Just look into it…
  • Severe security issues; and poor coding.
    • Keep in mind even if they don’t use the keylog maliciously, with the poor security wrapped around it, it is within reason to think it would be compromised.

Please keep in mind I am just looking at the black and white of things. This has nothing to do with how I ‘feel’ about them.  From a business standpoint, I can not simply fathom the use of any Microsoft product in any serious company; especially a software development one.

Now, I am experienced in IT/Software Development/DevOps; and anyone will tell you security is a trade off with convenience.  That is true.  However, between the cost (which is high); and the constant worry about security and stability with each patch.  Its something people really need to ask themselves, ” Is this really convenient/cost effective”; and 15 years ago it might have been yes. Now, there is no excuse.

 

Be Careful with LetsEncrypt!

 

I must say, like a lot of people I love the idea of a free SSL Certificate.  So I thought this would be great for my site.  So I downloaded the LetsEncrypt package on to an Ubuntu 15.10 box.  The server was running Apache2, and was pretty much stock.  When I applied the cert to the site, it was super easy.  I was very impressed with the ‘–apache’ option.  I then updated my URLs in WordPress to HTTPS.  That’s it I was up and running in a few min.  I was pretty happy at this point.

Then, I realized it broke all of the other services I had on the machine that were public facing.  I had several.  Even ones with their own certs were breaking.  So I decided to remove it…. After removing it from Apache completely I noticed an issue.  All of my users that had been to the site; were getting redirected still.  Somehow it is keeping the redirct with the cert/data that is installed when the cert is installed from visiting the site.

Long story short, I had many people that thought my site was down.  I even moved servers; and it still happened. I tried clearing browser cache, DNS Cache on my MAC, from another IP. Finally after a reinstall (probably not needed, but quicker); I was able to actually load my site without the redirect.  I am sure there is something here I am not seeing; but to be honest I didn’t feel like spending all my time dealing with browser settings.

If anyone would like to let me know how they get around this I would like to know.

I hope this helps those who are thinking of trying out LetsEncrypt.  I am not saying its a bad product; or idea.  I love the install and the idea of it.  However, the practical implementation is not there yet.  For those reading this keep in mind that it is still in Beta as of this article.  So this might eventually go away.

P.S. – To those on the LetsEncrypt project, I appreciate all the work; and I hope you take this criticism positively. A good uninstall path is needed before I think this will go mainstream on monolithic boxes.  Maybe its ok with a 12 factor applications.

Sincerely,

Matthew Curry