A Technical I.T./DevOps Blog
Problem scenario: You have two AWS instances in the same security group. The Security Group has rules for “All TCP” associated with both the public IP address (visible in the EC2 portion of the AWS Console) and the private IP address (found when you issue an “ifconfig” at the OS level of the server). You find that the servers cannot ping each other. You cannot SSH from one to the other either.
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Continue reading “Two AWS Servers Cannot Ping Each Other. What Is Wrong?”
Problem scenario: You are trying to set up a Chef Client on a VM to be configured to communicate with your Chef Server (version 12). The OS of both servers (the Chef server and the server that will be the Chef client) is RHEL 7.3.
You run this command from a server that you want to be a Chef client:
knife client list
You get this:
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Continue reading “Connection Refused Error When Trying to Configure Chef Server on RedHat”
Historically the term “continuous integration” has been the norm in the world of technology. In this article, Amazon defines it. As of two days ago, Amazon posted an article using the term “continual integration.” This website helps promote the grammatically correct “continual integration.”
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Continue reading “Continuous Integration vs. Continual Integration”
Problem scenario
You want to install SaltStack on RHEL instances for the first time on an AWS server.
Solution in Three Parts
(If you want instructions on how to do this with Debian/Ubuntu and/or Linux SUSE, see this posting.)
Part 1 Create a Salt Master Server
1. Create a RHEL instance and put it in a Security Group that has access to the Internet for this initial setup,
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Continue reading “How To Install and Configure Salt Stack on RedHat Linux (AWS Instances)”
Problem Scenario
In CloudBolt (the Cloud Management Platform), you run a job to create a server. The job stops progressing. The GUI shows “Failed Order … provisioning nameOfServer” with a bar that has the left most 5% red and the rest of the 95% gray. What do you do to create the server?
Answer
The server may be created; there may have been a small error when the job ran.
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Problem Scenario You try to use an AWS CLI command, but you get an error. The error says “[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:…)”
Possible solutions
#1 Redo the AWS configuration. Issue this command: aws configure
Leave the AWS Access Key ID and the AWS Secret Access Key the way they are. Look at the “Default region name.” Verify there is no letter at the end.
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Continue reading “How To Resolve “Certificate_Verify_Failed” error when trying an AWS CLI command?”
AWS used to have a separate API package from their CLI package; now the two are the same. OpenStack components’ command line interface activity is captured in a log when proper thresholds are set (e.g., nova.conf, glance.conf etc.) and later met. CLI activity (which bypasses Horizon) as well as GUI API activity (e.g., mouse clicks on buttons in Horizon) is written to a file named api.log. The location of this api.log file follows this convention: /var/log/OpenStackComponentName/api.log (where “OpenStackComponentName” is nova,
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Continue reading “The Apparent Story Behind OpenStack Component Log File Names”
Update on 11/20/20: We recommend you see How Do You Install the docker.service File on RHEL 8.x? instead of the directions below. (Many times this command will work: sudo yum -y install docker )
Update on 9/10/19: These directions below work to install Docker version 17.05.0-ce on RHEL 8.x.
These “directions” to install Docker on RedHat Enterprise Linux include a script and how to run it.
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Continue reading “How To Install Docker on an AWS Instance of RedHat Linux”
Updated 12/26/18
Problem scenario
You want to install Docker. You can make changes to the Ubuntu Linux repositories so you can use apt-get to install it. How do you install Docker on an AWS EC-2 instance?
Solution
There is an alternative set of directions if you click on this link here (if you would prefer not to configure the apt-get repositories). These directions below to install Docker on Ubuntu Linux include a script and how to run it (but the script below will make a change to the repositories that the Linux server uses).
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Continue reading “How To Install Docker on an AWS Instance of Ubuntu”
Problem scenario: You are trying to upload a file to S3 but get an error. You use a command like this:
curl -T /path/to/sourcefile.java http://s3.amazonaws.com/my.bucket/sourcefile.java
You get an error in XML that includes “The specified key does not exist.”
Solution: Check the path to your source file. Verify your source file is there with the name you expect it to be.
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Continue reading “AWS S3 Problem: “The specified key does not exist.” How do you solve this?”