A Technical I.T./DevOps Blog
Problem scenario
Are are asking yourself “why am I being prompted for a password when my SSH keys were set up correctly?” When the contents of the .pub file (the public key) are placed into the authorized_keys file (in the /home/jdoe/.ssh/ folder of a client machine), the user should be able to SSH over to the server with no password — unless the SSH key was generated with a passphrase.
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Continue reading “How Do You Set Up Passwordless SSH to a Windows Server?”
Problem scenario: When you move a Windows .txt file to a Linux server, new characters can be introduced. For example, the content of the file can have a “^M” (with no quotes) at the end of every line. Sometimes tr, sed, and awk won’t work to remove this new jibberish (extraneous characters). Moreover, sometimes the substitute command in vi will fail to do anything about these extraneous characters (^M). How do you eliminate these extra characters at the end of every line?
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Continue reading “Moving a Windows .txt file to a Linux Server”
“Documentation plays a great role in the maintenance of a project.” (Page 19, Learn Apache Ant, Tutorialspoint.com, 2014)
The open source movement is no exception. As much as we admire The Apache Software Foundation, we are disappointed that they don’t correct errors. We’ve submitted the first two errors below to them. However, mistakes remain. Here are some errors to help other people who may be confused:
#1 was corrected.
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Continue reading “Apache Software Foundation Has Imperfect Websites”
Sometimes you cannot edit and save a single file in Linux. For example, if you boot into maintenance mode after the /etc/fstab is corrupt, you cannot edit the very file that is causing the problem. To overcome this problem, you will need to log in as root and issue a command. You will need to manually edit the /etc/fstab. To do this in maintenance mode you need to issue this command from the prompt:
mount -o remount,rw /
After this,
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Continue reading “What To Do When Linux Files Are Read Only”
“If you learn nothing else from training, it is very important to learn that your limits are seldom where you think they are.” (Page 94 of Starting Strength.)
When challenged at work, be it debugging a program or getting a server or pod to work properly, sometimes it makes sense to escalate the problem or ask for assistance. This is true for lead architects, I.T. vendors,
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Continue reading “Top Five Reasons To Ask For Help When Working in I.T.”
Python is a great language.
On 11/10/15 we found an error on this Python documentation site. Here is what we saw for the endswith function documentation:
The Syntax for the “endswith” function, on the face of the documentation, involves “startswith”. We updated the site by clicking the “Edit on GitHub” link. We corrected it on 11/10/15. Hopefully someone will approve this change and the canonical syntax in the documentation will be corrected.
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1. Generic API Question
What are the HTTP operations associated with the acronym CRUD?
2. OpenStack API Question
Assuming a verbose amount of logging has been preconfigured, does the API log for glance ordinarily capture glance activity from the CLI (commands that bypass horizon)? As a hint, the default location of this log is this: /var/log/glance/api.log
3. OpenStack API Question
The “Create Image” feature in Horizon is an API call with an underlying “Post” call.
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Java source code is compiled into bytecode. Bytecode, when run, is executed by the processor. Sequences of bytecode go through processors, and on occasion these sequences must be analyzed for developing new Java software. Java Enterprise Edition (the programming language of choice for many businesses) is owned by Oracle. However, Oracle is not always the best creator or custodian of documentation for Java. Here is an example (as of November 2015) taken from Oracle’s
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There are many different configuration management tools. These programs promote the management of servers either through the release of code or through the deployment of infrastructure patches. They can do more than that. Commonly their utilization facilitates the transfer of files as well as the modification of existing files. Four of these configuration management (CM) tools that are very popular among modern enterprises include Puppet, Chef, Ansible, and SaltStack. This post will briefly compare and contrast some aspects of the tools themselves.
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