MYJAVACAFE

EndOfLife Software packages

2024-07-10T06:49:00.003+05:30

The "End of Life" (EOL) page for Software provides information on the release dates, support periods, and security status of different Software versions. It lists the latest supported version, the end dates for older versions, and provides links to further resources. This page is useful for understanding the support lifecycle of Software releases and ensuring that you are using a version that

Replace H2 with a real database in spring boot application

2024-06-11T14:03:00.000+05:30

Springboot application facing bellow error or need to implement real test data base:Senario:Could not prepare statement [Table “XXXX” not found (this database is empty); SQL statementSolution:Add bellow configuration in test application.ymlspring: test: database: replace: none---Code:@DataJpaTest @TestPropertySource(properties = { "spring.test.database.replace=none", "

How to password pass while connect ssh in the command line

2023-02-17T11:51:00.002+05:30

Now a days, it's very difficult remember the vm passwords while connecting in the office network. So, Connect easily using sshpass.For installation for mac/Linux:Mac:brew install hudochenkov/sshpass/sshpassLinux:yum install sshpassExample of usage:Ex:sshpass -p test123 ssh root@192.168.1.1Reafference:https://stackoverflow.com/questions/32255660/how-to-install-sshpass-on-mac

SRIOV CNI Plugin

2022-11-16T12:07:00.000+05:30

The Single Root I/O Virtualization (SR-IOV) specification is a standard for a type of PCI device assignment that can share a single device with multiple pods. SR-IOV enables you to segment a compliant network device, recognized on the host node as a physical function (PF), into multiple virtual functions (VFs), and make them available for direct IO to the POD.This plugin enables the

Understanding the Kubernetes Node

2022-11-16T11:56:00.002+05:30

Kubernetes is an open-source orchestration engine for automating deployments, scaling, managing, and providing the infrastructure to host containerized applications. At the infrastructure level, a Kubernetes cluster is comprised of a set of physical or virtual machines, each acting in a specific role.Master components are responsible for managing the Kubernetes cluster. They manage the life cycle

TCPDUMP useful commands for debugging

2022-11-16T11:41:00.001+05:30

How to Install tcpdump in Linux:$ sudo apt-get install tcpdump [On Debian, Ubuntu and Mint]$ sudo yum install tcpdump [On RHEL/CentOS/Fedora and Rocky Linux/AlmaLinux]$ sudo emerge -a sys-apps/tcpdump [On Gentoo Linux]$ sudo pacman -S tcpdump [On Arch Linux]$ sudo zypper install tcpdump

Create New VPN entry in Cisco AnyConnect

2022-04-26T12:30:00.000+05:30

MacBook process to add new VPN entry:cd /opt/cisco/anyconnect/profilesudo cp clientprofile_old.xml clientprofile_new.xmlsudo vi clientprofile_new.xml Update hostname and hostaddress Ex: <ServerList> <HostEntry> &

DevOps vs GitOps

2022-04-15T00:36:00.000+05:30

DevOps is about cultural change and providing a way for development teams and operations teams to work together collaboratively. GitOps gives you tools and a framework to take DevOps practices, like collaboration, CI/CD, and version control, and apply them to infrastructure automation and application deployment.GitOps Free Training(LinuxFoundation):https://trainingportal.linuxfoundation.org/learn

ISTIO: Istio and kind installations and Bookinfo application execution steps

2022-04-06T13:17:00.003+05:30

What is istio:Istio addresses the challenges developers and operators face with a distributed or microservices architecture. Whether you're building from scratch or migrating existing applications to cloud native, Istio can help.Reference: https://istio.io/latest/about/service-mesh/==Install docker:https://docs.docker.com/desktop/mac/install/==Create cluster using kind:brew install kindkind

ISTIO: View Dashboard usages

2022-04-06T13:11:00.004+05:30

kubectl apply -f samples/addonskubectl rollout status deployment/kiali -n istio-systemKiali:Kiali is a management console for Istio service mesh. Kiali can be quickly installed as an Istio add-on, or trusted as a part of your production environment. See below for more about what Kiali offersistioctl dashboard kialihttp://localhost:20001/Reference:https://istio.io/latest/docs/tasks/observability/

ISTIO: Cleanup resources

2022-04-06T12:59:00.006+05:30

Cleanup the resources:Remove any kubectl port-forward processes that may be running:killall kubectlCleanup the addons tools and istio-system namespace:kubectl delete -f samples/addonsistioctl manifest generate --set profile=demo | kubectl delete --ignore-not-found=true -f -istioctl tag remove defaultkubectl delete namespace istio-systemkubectl label namespace default istio-injection-Cleanup

Pushing Images to artifactory or any location of docker environment

2022-02-16T19:40:00.000+05:30

Skopeo is a tool for moving container images between different types of container storages. It allows you to copy container images between container registries like docker.io, quay.io, and your internal container registry or different types of storage on your local system.Below are the steps to push or pull images from artifactory using skopeo instead of docker. Skopeo is just a cli and does not

How to start couchdb instance in the docker container

2022-02-07T20:13:00.003+05:30

We have different ways to connect couchdb in docker containers>>> Using docker compose:Step1:create file docker-compose.yml::version: '3'services: couchserver: image: couchdb restart: always ports: - "5984:5984" environment: - COUCHDB_USER=admin - COUCHDB_PASSWORD=admin&

Python sWSGI.ini applications configurations

2021-08-23T23:40:00.001+05:30

A note on Python threadsIf you start uWSGI without threads, the Python GIL will not be enabled, so threads generated by your application will never run. You may not like that choice, but remember that uWSGI is a language-independent server, so most of its choices are for maintaining it “agnostic”. But do not worry, there are basically no choices made by the uWSGI developers that cannot be changed

Sort with given object multiple properties names, age using JAVA8

2021-08-23T23:10:00.003+05:30

List can be sorted using Java 8 Lambda Expressions, moving right past syntactic sugar and into real and powerful functional semantics. The implementation of all of these examples and code snippets can be found over on gitHub: https://github.com/ramanujadasu/tutorials/tree/master/core-java-modules/core-java-lambdas List<Human> humans =

Custom Marker Interface Implementation in Java

2021-08-23T22:39:00.001+05:30

Marker interface has no method. Java has built-in marker interface like Serializable, Cloneable & Event Listener etc that are understand by JVM.We can create our own marker interface, but it has nothing to do with JVM, we can add some checks with instanceOf. Create the empty interface  interface Marker{ } Write a class and implements the interface  class

Can we use return statement in finally block in java?

2021-08-23T22:32:00.004+05:30

Bellow program output is always 2, as we are returning 2 from the finally block. Remember the finally always executes whether there is a exception or not. So when the finally block runs it will override the return value of others. Writing return statements in finally block is not required, in fact you should not write it. public class Test { public static int test(int i) { try

AWS VS Azure VS GCP VS IBMCloud Basic Details(Multi Cloud)

2021-08-05T21:27:00.000+05:30

Cloud Computing is the delivery of on-demand computing resources (computer power, database storage, applications as well as other IT resources) over the internet. This is achieved by using a network of remote servers hosted on the internet rather than a local server/personal computer. A cloud service is any service made available to users on demand via the Internet from a cloud computing

Profile creation and data structure concepts examples

2021-08-03T22:34:00.004+05:30

Found few good tutorials and capture the profile building and data-structure concepts examples.Profile creation tips and related sites:https://github.com/ramanujadasu/golden-profile-tips/tree/main/profilecreationtipsData structure concepts and example git repos:https://github.com/ramanujadasu/golden-profile-tips/tree/main/datastructuresVisual view for DataStructures:https://visualgo.net/en/

Google Cloud questions and explanation

2021-08-01T16:44:00.003+05:30

Question: What is GAE and GCE in GCP?Solution : Google App Engine (GAE) and Google Compute Engine (GCE) are both used for deploying applications and are equally popular with small and large businesses. Google App Engine is a Platform as a Service (PaaS) solution that makes deployment easier.The Google Compute Engine on the other hand is an Infrastructure as a Service (IaaS)

Spring Boot question and explanations

2021-08-01T16:43:00.004+05:30

Question: What is diff BeanFactory and ApplicationContextFactory?Solution:The Spring Framework comes with two IOC containers – BeanFactory and ApplicationContext. The BeanFactory(Lazy Loading is the most basic version of IOC containers, and the ApplicationContext ( Eager Loading) extends the features of BeanFactory.BeanFactory loads

Core Concepts and Brief Explanation

2021-08-01T16:42:00.002+05:30

Question : Why to Override equals(Object) and hashCode() method ?Solution: HashMap and HashSet use the hashcode value of an object to find out how the object would be stored in the collection, and subsequently hashcode is used to help locate the object in the collection. Hashing retrieval involves:First, find out the right bucket using hashCode().Secondly, search the bucket for the right element

AWS S3 CURD Operations using spring boot

2021-07-31T01:06:00.005+05:30

AWS S3 CURD Operations including spring boot actuator featuresREADME file mentioned to run procedureGITURL: https://github.com/ramanujadasu/aws-curd-apisGIT SSH link:git@github.com:ramanujadasu/aws-curd-apis.gitSpring Boot AWS Cloud Supporthttps://spring.io/projects/spring-cloud-aws#overview Samples:https://github.com/spring-cloud-sampleshttps://github.com/ramanujadasu/aws-refapp

Vertical Scaling and Horizontal Scaling

2021-07-28T14:33:00.001+05:30

Scaling an on-premise infrastructure is hard. You need to plan for peak capacity, wait for equipment to arrive, configure the hardware and software, and hope you get everything right the first time. But deploying your application in the cloud can address these headaches. Vertical scaling means that you scale by adding more power (CPU, RAM) to an existing

Interview learning process flow: It may help for the charts using coggle

2021-07-27T16:40:00.000+05:30

Reference: https://coggle.it/diagram/YP-O2iqjIO9jM8Up/t/master-the-interview