A Technical I.T./DevOps Blog
Problem scenario
You want to create a GCP bucket. What should you do?
Solution
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Problem scenario
When running an Ansible playbook using the java_cert module you receive an message “[Errno 2] No such file or directory”. How do you fix this?
(If you were using a file linking step in the playbook and not the java_cert module, see this posting.)
Solution
Use the “executable” attribute of the java_certs module (https://docs.ansible.com/ansible/latest/modules/java_cert_module.html) to specify the full path of the keytool file.
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Problem scenario
You have read that Ingresses have benefits compared to Services. You know the two are different for routing external traffic to reach a Kubernetes pod. When would you want to use a Service instead of an Ingress?
Possible Answers
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Continue reading “What Are The Advantages of a Service over an Ingress in Kubernetes?”
Problem scenario
You want to know if your EC-2 servers are in a VPC or not. What do you do to determine if your EC-2 servers are in a VPC?
Possible Solution #1
To use the web console, see this external posting.
Possible Solution #2
This is a programmatic, character-based solution.
Prerequisite
This assumes that you have installed the AWS CLI.
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Continue reading “How Do You Find if Your EC-2 Servers Are in a VPC?”
Problem scenario
You want to list the subnet ID values in AWS. What do you do?
Solution
Prerequisite
Install and configure the AWS CLI; if you need assistance, see this posting if you can you the pip command and you are using Ubuntu. If you cannot use the pip command or you are not using Ubuntu, see this posting.
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Continue reading “How Do You Find the Subnet ID Values in AWS?”
Problem scenario
Use PDF Architect or Adobe Acrobat you open a PDF but you see “Please wait… If this message is not eventually replaced by the proper contents of the document, your PDF viewer may not be able to display this type of document.” You know the PDF is good. You may or may not be prompted to enter a password to view the PDF. You don’t think that the PDF viewer should be prompting you for a password.
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Question
With a newer version of Jenkins, you want to know what a multi-branch job is. What is a multi-branch Jenkins job?
Answer
In Jenkins, a project is a job; the term job has been deprecated however (according to the Jenkins’ website). To see the difference between a Jenkins pipeline and a Jenkins project, see this posting: What Is the Difference between a Jenkins Project and a Jenkins Pipeline?
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Problem scenario
You have an Nginx server that you want to be a traffic distributor to Apache web servers. What has to be done to configure Nginx’s HTTP load balancing function to relay inbound connection requests to Apache web servers?
Solution
Nothing special has to be done for the web servers. Nginx can be a reverse proxy to either Nginx web servers or Apache web servers. The “upstream backend {}” block in the file /etc/nginx/conf.d/default.conf in Nginx’s distributor instance merely has to have stanzas like these:
upstream backend {
server apache.web.server.com;
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Continue reading “How Can Nginx Be an HTTP Load Balancer for Apache Web Servers?”
Problem scenario
You run a command like this:
aws s3api create-bucket –bucket coolnameforbucket
But you get this error:
“An error occurred (IllegalLocationConstraintException) when calling the CreateBucket operation: The unspecified location constraint is incompatible for the region specific endpoint this request was sent to.”
How do you create a bucket with the aws s3api command?
Possible Solution #1
Run a command such as this,
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Problem scenario
You want to use a Data Analytics or a Big Data tool that publishes messages and subscribes to listening to messages being published. You know GCP has a Pub/Sub tool. You know it supports synchronous and asynchronous messaging. How do you use it with Python?
Solution
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Continue reading “How Do You Use Google’s Cloud Pub/Sub with Python?”