A Technical I.T./DevOps Blog
Problem scenario
You want to manually create a config file for Kubernetes. (You do not want to run aws eks update-kubeconfig –name foobar.) How do you do this?
Solution
These directions are most suited for Amazon EKS. But they could be adapted for clusters running in other environments (not just AWS). If you are using GCP, go to the very bottom of the directions and skip the rest.
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Continue reading “How Do You Create a config File for Kubernetes Manually?”
Problem scenario
You want to use Amazon EKS. You tried to run an “aws eks” command but got an error about the root user not being allowed to perform the operation. How do you create an IAM user account in AWS to run AWS CLI commands for EKS and log into the AWS web UI and view EKS clusters?
Solution
Prerequisite
This assumes you have a group that has the correct policies to enable EKS manipulation.
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Problem scenario
You use EKS to create a Kubernetes cluster. How do you create a group for AWS user accounts to enable them to manage Kubernetes clusters in AWS?
Solution
1. Log into the AWS web console.
2. Go here: https://console.aws.amazon.com/iam/home?
3. Go to Groups on the left.
4. Click the “Create New Group” button.
5. Enter a name (e.g., coolgroup).
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Problem scenario
For security reasons, you do not want to have to use “sudo” to elevate your privileges when you run docker commands. What should you do?
Solution
1. Run these commands as the user that will be able to run docker commands:
sudo groupadd docker
sudo gpasswd -a $USER docker
newgrp docker
2. Install Docker. See this
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Continue reading “How Do You Run Docker commands without sudo?”
Problem scenario
You want to create a Kubernetes cluster in AWS via a RHEL server. What should you do?
Solution
This will deploy additional resources in your AWS account (not on to the RHEL server). It will cost money to follow these directions.
Prerequisites
i. Install and configure the AWS CLI (or awscli). If you need help, see this posting.
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Continue reading “How Do You Deploy a Kubernetes Cluster into AWS with a RHEL Server?”
Problem scenario
You want to manage Kubernetes (e.g., Amazon EKS) via a server in AWS. You want to install the aws-iam-authenticator on a Linux server. How do you do this?
Solution
1. To install aws-iam-authenticator go here to obtain the link that is relevant for your server. You will search the above link for “aws-iam-authenticator binary from Amazon S3”
2.
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Continue reading “How Do You Install The aws-iam-authenticator?”
Problem scenario
You want to use Flask inside a Docker container. You want to build your own image for the Docker container. How do you create your own Dockerfile to create a Flask application?
Solution
Prerequisite
Install Docker. See this posting if you need directions.
Procedures
1. Create a Dockerfile with the following content (you may want to replace “16.04” with “latest” and if you want to change the location of where the .py file is,
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Continue reading “How Do You Create Your Own Dockerfile to Create a Flask Application?”
Problem scenario
You want to create Docker containers with Java 9. How do you create a Docker image to make containers with Java 9 installed in them?
These directions were updated on 12/26/18.
Solution
Prerequisite
This assumes that you have Docker installed. If you need assistance with this, see these postings depending on your operating system:
Debian/Ubuntu
CentOS/Fedora/RHEL
SUSE
Procedures
1.
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Continue reading “How Do You Create a Docker Image That Has Java 10 in It?”
Problem scenario
You want to monitor Docker containers. Therefore you want to install Sysdig to try it out. How do you install Sysdig in a pre-existing Docker container?
Solution
Run these three commands:
apt-get -y update
apt-get -y install curl
curl -s https://s3.amazonaws.com/download.draios.com/stable/install-sysdig | bash
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Continue reading “How Do You Install Sysdig in an Existing Debian-Based Docker Container?”
Some of these items are books, practice exams or DVDs related to Kubernetes. This list was updated on 4/5/20.
Amazon EKS: User Guide
Building Enterprise JavaScript Applications: Learn to build and deploy robust JavaScript applications using Cucumber, Mocha, Jenkins, Docker, and Kubernetes
Building Microservice Systems with Docker and Kubernetes – Training DVD
Certified Kubernetes Application Developer (CKAD) Complete Video Learning Certification Exam Set (DVD)
Cloud Native DevOps with Kubernetes: Building,
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