Class session:
Announcements:
Please check the feedback for Exercises 33 & 34 Makefile. Multiple students (but not all) had
spaces instead of tab indentation. I had to run the Makefile through unexpand to fix them. This issue may be due to how you
copy/paste it into the form. Just make sure that that the Makefile in your directory works.
There are a couple of ways to go through the material for today. View both screencasts, then do the crossword (which involves both), then do the Makefile exercises. Or do the Makefile exercise as you finish the corresponding screencast. Whatever you do, follow the order of static then shared.
I am not entirely confident in how well I prepared you for today’s Makefile exercises. If you have any questions or confusion, please contact me. It will help your answer and benefit the class as this affects what I post on Wednesday.
Exercise 35: Static Library Makefile
A reminder that your previous Makefile (from Exercises 33 & 34) did the following:
make - Runs srcComplexity (uses the first target by default)make run - Runs srcComplexity with an example filemake clean - Cleans up generated filesTake that Makefile (from Exercises 33 & 34) and perform the following changes so that these commands run correctly:
make static - Builds program srcComplexityStatic using a static library libsrcmlxpath.amake runstatic - Runs the program srcComplexityStaticmake clean - Now also removes the static libraryMake sure that the commands all run correctly.
Note: You can add a target for static and srcComplexityStatic in the following manner:
.PHONY: static
static : srcComplexityStatic
You do not need an action for the target static. Then, create the target for srcComplexityStatic.
Upload your Makefile to DevOps Exercises 35 Static Library Makefile
Screencast: Shared Libraries showterm Session
Appears the last minute is messed up. A sync problem in the edit(able) version. Here is the text of the last minute:
I should also point out here that there are many libraries. Where you cannot get the code or get the libraries with the dot, you have an -fpic run on them or the option when they were compiled in that’s one reason we sometimes have to build libraries from scratch if you’re using them in other applications.
Okay. I’m going to stop now.
I was even less abrupt in this one.
Exercise 36: Shared Library Makefile
Take the Makefile from Exercise 35 Static Library Makefile and perform the following changes so that these commands run correctly:
make shared - Builds program srcComplexityShared using a shared library libsrcmlxpath.somake runshared - Runs the program srcComplexitySharedmake clean - Now also removes the shared libraryMake sure that the commands all run correctly.
Upload your Makefile to DevOps Exercises 36 Shared Library Makefile
Exercise 37: Shared & Static Library Crossword
You may need to look at man/info pages for some of the command options.
Screencast Folder: Class 15 Mon Sep 28
Exercise Due Date: Tuesday, Sep 29 at 4 pm
Reminders:
Class session:
$< Replaced with the first dependency (less than symbol)$^ Replaced with all dependencies (up arrow, or caret, symbol)$@ Replaced with the name of the target (at symbol)Further explanation from the Make Manual
Exercises 33 & 34:
Note: To do this on your own Ubuntu server/installation, you need to install libxml2-dev:
sudo apt-get install libxml2-dev
The class server already has this package installed.
Grab the code for SEComplexity and write a Makefile. You can use the screencast to review anything that you missed. Make sure that it works on the demo server.
I strongly advise that you enter it in steps (as I did), and make sure each part works.
Then, add the following:
#include for a new source-code file, XPathUtilities.hpp, to
srcMLXPathCount.cpp and update the build. This file can be empty.If both cases, you need to update the Makefile to accommodate these build changes.
Upload your Makefile to DevOps Exercises 33 & 34 Makefile
Screencast Folder: Class 14 Fri Sep 25
Exercise Due Date: Sunday, Sep 27 at 4 pm
Reminders:
Class session:
Announcements
The class server has individual accounts based on your UAID and your submitted key. The shared class1 (class2, etc.) accounts are now deprecated, and I will remove them by Mon Sep 28.
The class server is on Linode. If you have used it to run docker, you are sharing (with the rest of the class) a $5 a month server. See Brightspace for more details, including a coupon code for $20, which is 4 months of free use of your own server.
make; make run; make test. For the install, copy the sort program to /usr/local/bin/sortDevOps. When the install is complete, remove the source and build files. Again, all of this is in the Dockerfile.Demonstrate this in a container using a single showterm session:
which sortDevOps to demonstrate that the program is installedsortDevOps c b aYour Dockerfile should not only work but demonstrate the principles shown:
You do not have to pull/push to Docker Hub.
Upload your single showterm session URL and your Dockerfile to DevOps Exercises 30 & 31 Dockerfile
Screencast Folder: Class 13 Wed Sep 23
Exercise Due Date: Thursday, Sep 24 at 4 pm
Reminders:
showterm --delete <URL>Class session:
Exercise 25: Documenting Dockerfiles & Installing via URL Crossword
There are many short “words” in this one.
Inside note. I use crosswordlabs.com to create a crossword. For the first time, I got the warning: “Keep adding more words!” and “We couldn’t place these words on the crossword because they don’t have enough common letters with other words: …”.
Demonstrate this in a container using a single showterm session:
Your Dockerfile should not only work but demonstrate the principles shown:
You do not have to pull/push to Docker Hub.
Upload your single showterm session URL and your Dockerfile to DevOps Exercises 27 & 28 Dockerfile
Screencast Folder: Class 12 Mon Sep 21
Exercise Due Date: Tuesday, Sep 22 at 4 pm
Reminders:
showterm --delete <URL>Programming classes spend an entire semester using a single programming language, e.g., C++ in 3460:209/210.
In DevOps, there are a large number of new technologies with associated special-purpose languages. One term used for this is DSL (Domain Specific Language). Just with Docker, we use general Unix & bash commands, Dockerfile instructions, docker (CLI) commands, and will eventually use Docker Compose declarations. And this is only one technology in the course.
To be successful, do the following:
Style is very important. I have never seen Dockerfile instructions, e.g., “RUN”, in lowercase. I had assumed that these instructions must be uppercase. In the Dockerfile exercise, some of you did not use uppercase. Yes, it worked, but it did not follow the style, and if you were applying for a job and wrote them that way, they would not hire you.
So follow the style you of the examples and documentation:
Doing so is even more critical than with source code. In DevOps, we tend to:
A brief overview of using CMake using sortDevOps as an example:
/sortDevOpsMany Makefiles assume an in-source build where the generated object code, libraries, and executables are created in the source directory
CMake is typically used with an out of source build where the generated files are in a separate directory from the source. This separation:
make cleanCreate a build directory. Typically these are at the same level as the source
and have a name based on the source directory name, e.g., /sortDevOps-Build.
Invoke the cmake command to generate the Makefile
cmake /sortDevOps
make; make run; make testClass session:
Special Note: The class server now has individual accounts based on your UAID and your submitted key. Transition to using those instead of the shared class1 (class2, etc.) accounts.
Screencast: Build Image Part A showterm Session, SimpleDockerfile Repository
One thing I should have mentioned is that tokens (as with dockerhub) allow a more restricted access an account than a password. E.g., a token cannot be used to change a password. This follows the “principle of least privilege”. I.e., we only need to pull and push images, not change the account.
Screencast: Build Image Part B
In two parts due to recording issues. Continuation in the showterm above. I need to work on some tools for easily manipulating showterm sessions.
Exercise 23 & 24: Create a Dockerfile for a container to build a C program (C++ is not needed).
You can build the Dockerfile off any version of Ubuntu. Once you have it working, demonstrate the following in a single showterm session:
Your Dockerfile should not only work but demonstrate the principles shown:
You do not have to pull/push to Docker Hub.
Upload your single showterm session URL and your Dockerfile to DevOps Exercises 23 & 24 Dockerfile
Screencast Folder: Class 11 Fri Sep 18
Exercise Due Date: Sunday, Sep 20 at 4 pm
Reminders:
To delete a temporary showterm session, the command is showterm --delete <URL>
Class session:
Screencast: Running Docker showterm Session
I am trying something new with this screencast. The screencast is a video of me narrating a showterm session. You can also view the showterm session directly (with no audio, of course). Note that the timing is not quite the same as the video is edited, and sometimes showterm is paused as I discuss the command. If you have trouble seeing the commands, refer to the showterm session.
Exercise 21 & 22: Demonstrate the docker commands used in the Running Docker screencast. This assignment counts as 2 exercises.
Use showterm to record your session. Install showterm on your local machine (highly recommended) (see showterm.io for installation instructions, or use the class server (accounts class1, class2, .., class5).
Your session does not have to be perfect. You can mess up commands, etc. Also, don’t enter my mess ups. Note that you can copy and paste from my showterm session, but I suggest you limit it to URLs. Entering the commands will help you to understand and remember them. You may want to follow in the showterm Session as you can move around the session much more easily.
To start your recorded session:
showterm
To end a recorded session, use a “Control-D” or type:
exit
I suggest you first experiment recording a showterm session with just a few simple commands.
After recording your showterm session, a URL of the form http://showterm.io/… will appear. Upload this URL to DevOps Exercises 21 & 22 Running Docker Session
Make sure to view your session via the URL (enter it into a browser). If you want to break this up, you can create multiple showterm sessions. Just make sure to give me all the URLs.
If you want to delete a temporary showterm session (not the URL you are submitting), the command is:
showterm --delete <URL>
Screencast Folder: Class 10 Wed Sep 16
Exercise Due Date: Thursday, Sep 17 at 4 pm
Announcements:
Class session:
Screencast Folder: Class 9 Mon Sep 14
Exercise Due Date: Tuesday, Sep 15 at 4 pm
Announcements:
In the spring, I was approached by the UA CIO (Chief Information Officer) about a program where faculty included training for Azure in their classes. The benefits are:
I felt that one missing part of this course was an overview of a full cloud platform, such as Azure. In preparation, I did the following:
Therefore:
For now, you will need to complete a survey for the program. I will send this out in email during class time on Monday. I am not sure what the survey result is, but whatever it is, upload it as a PDF to Brightspace to receive credit.
Multiple students had issues today with SSH agent forwarding. It appears to boil down to whether you had an ssh-agent running or not.
Suppose you are on a UNIX-based OS using a GUI (Linux desktop, macOS). Then ssh-agent is automatically set up and running. If you are using Linux on a server or WSL, then the ssh-agent is not automatically setup.
So, you have to set them up. The commands to do so are in the notes
If you are on macOS, add the macOS specific SSH directives to your ~/.ssh/config file. They will make managing keys and passphrases easier.
During this class session:
Screencast is in the folder Class 8 Fri Sep 11.
For the last two exercises, I believe I have given you enough information to complete it. If you have any questions at all, contact me. Note that if you update your public key in the DevOps SSH Key form, there may be a delay as I have to manually add the key to the accounts on the class server.
All exercises are due by 4 pm on Sunday, Sep 13. To receive credit for the exercise, you must view the screencast via Brightspace.
Some screencasts are from the notes, so see the notes page to follow along.
Announcements:
Note: See special post on SSH Agent Forwarding and ssh-agent
Complete the following in order:
Special Note: The ForwardAgent has to be in effect using the proper host name. For now, put the ForwardAgent directive in the “Host *” part.
class5
Your public SSH key is in the .ssh/authorized_keys file in one of these accounts.
Before you begin, you must make sure you have done the following correctly:
The following references “knuth or your local machine”. By this, I mean the system that contains your private SSH key. I prefer this to be your local machine, but it is not required.
Complete the following in order:
Special Note: Due to the problem on Friday, today’s lesson is the same as Friday’s
During this class session:
Note: When someone requests your SSH key, they mean the entire contents of your public key file (e.g., id_ed25519.pub). Never handout your private key
Screencast is in the folder Class 6/7 Fri/Mon Sep 4/9.
All exercises are due by 4 pm on Thursday, Sep 10. To receive credit for the exercise, you must view the screencast via Brightspace.
Some screencasts are from the notes, so see the notes page to follow along.
Announcements:
During this class session:
Exercise 10: Activate CS Account
You need to activate your CS account to use the department servers. There were problems with these servers, but hopefully, they are fixed. Unfortunately, I cannot try this as a student.
So follow this process as far as you can. Upload a PDF that shows how far you get. If you don’t understand a step or get stuck, make a note in Brightspace when you upload the PDF. I give full credit for any attempt.
ssh uanetid@knuth.cs.uakron.edu, where uanetid is
your university account name. You do not have to be on the VPN or on the campus network to access knuth.cs.uakron.eduScreencasts are in the folder Class 5 Wed Sep 2.
All exercises are due by 4 pm on Thursday, Sep 3. To receive credit for the exercise, you must view the screencast via Brightspace.
Some screencasts are from the notes, so see the notes page to follow along.
Announcements:
During this class session:
Exercise 7: Docker Account
Create a Docker account at hub.docker.com. Upload a PDF to Brightspace that verifies you have an account. Deciding how to demonstrate this (i.e., what to upload) is part of the assignment.
Screencasts are in the folder Class 4 Mon Aug 31.
All exercises are due by 4 pm on Tuesday, Sep 1. To receive credit for the exercise, you must view the screencast via Brightspace.
Some screencasts are from the notes, so see the notes page to follow along.
Announcements:
During this class session:
Screencasts are in the folder Class 3 Fri Aug 28.
All exercises are due by 4 pm on Sunday, Aug 30. To receive credit for the exercise, you must view the screencast via Brightspace.
Some screencasts are from the notes, so see the notes page to follow along.
Announcements:
You do not have to be on the campus network (e.g., via VPN) to access Safari Books Online.
First, use the following link:
You will then create an account and use that account from now on.
During this class session:
Screencasts are in the folder Class 2 Wed Aug 26.
Except for Exercise 4, all exercises are due by 4 pm on Thursday, Aug 25. To receive credit for the exercise, you must view the screencast via Brightspace.
Some screencasts are from the notes, so see the notes page to follow along.
Announcements:
Find a case study of DevOps implementation in a company/organization.
Special Due Date: 4 pm Friday, Aug 28 4 pm Sunday, Aug 30
Write up some facts from the case study, looking for the following:
To get the widest variety of case studies, use the DevOps Case Study (link in Brightspace) to indicate who you are, the company, and the url of the case study. Different case studies on the same company are allowed but do not repeat the ordered pair (company, case study).
If you find more than one case study, go ahead and put it in the spreadsheet’s url column on a blank line. Other students can then claim it.
Note that I may share your report with the rest of the class.
The first class covers the following:
Exercise 1: Job Requirements Report
Find two different job listings that have DevOps in the title:
Write a report that includes the following:
The overall purpose of this assignment is to create a list of required technical skills.
Upload the report as a PDF to Brightspace
Exercises are due by 4 pm on Tuesday, Aug 25.
All screencasts are in a folder for that class period. Screencasts are posted by class time, and the corresponding exercises are due the next day. To receive credit for the exercise, you must view the screencast via Brightspace.
The folder for the first class meeting “Class 1 Mon Aug 24” is in Brightspace. To find it:
They are in the folder Class 1 Mon Aug 24. (direct link)
Some screencasts are from the notes, so see the notes page to follow along.
Announcements:
More than any other semester, I am sure that you have questions about the course. I will update this post as needed.
The course is online. This format fits the topic well, and much training in the DevOps field is online.
Class time is a combination of the following:
The screencasts and exercises are available by the start of class time and must be viewed/completed by the next day.
Even though you have past class time to view the screencasts and complete the exercises, I strongly suggest that you try to use class time to do this work.
During class time, I am online and available for questions in shared and private chat sessions. My current plan is to use Discord, as I found it worked well last semester.
Office Hours are online. I am available for questions in shared and private chat sessions.
For now, I do not have set times for on-campus office hours.
The draft syllabus for the course is on the main course page. The final version will be available right before the first class meeting.
The Midterm Exam and Final Exam are both online. I am considering a take-home exam for the Midterm and a demonstration for the Final Exam.
The textbook is available from a link on the main course page.