/DevOps-Info

all_information

Maven

  • -- JDK & Maven Installation --

sudo apt-get update -y sudo apt install openjdk-11-jre -y sudo apt-get install maven -y

  • version check

java -version mvn -version

  • Build Project:

first of clone repository and go inside the project

  • command validate project ignored the all warning

mvn validate

  • check syntax base error and All Dependency Download

mvn compile

  • go inside target folder for output 3 folder (classes, generated-sources, maven-status) cd ..

  • next command Test inside project folder

mvn test

mvn package

  • go target foldar check .jar file and back project folder

mvn install

  • clean package

mvn clean package

  • java base project temporary execute jar file for default port:8080

java -jar target/spring-boot-web.jar

To install Nexus on Linux, follow these steps:

  • 01. Prerequisites:

  • Ensure that Java Development Kit (JDK) is installed on your Linux system. Nexus requires Java to run. You can check if Java is installed by running the command java -version in the terminal. If Java is not installed, you can install it using the package manager of your Linux distribution.

  • 02. Download Nexus:

  • Visit the Sonatype website and go to the Nexus download page: https://www.sonatype.com/nexus/repository-oss-download

  • Alternatively, you can use the following command in the terminal to download Nexus:

wget https://download.sonatype.com/nexus/3/latest-unix.tar.gz

  • 03. Extract Nexus:

tar -xf latest-unix.tar.gz

  • 04. Configure Nexus:

  • Open the extracted Nexus directory.

  • In the bin folder, you will find a script called nexus (or nexus.exe for Windows). This is the Nexus startup script.

chmod +x nexus

  • 05. Start Nexus:

./nexus start

  • 06. Access Nexus Web UI:

  • Open a web browser and navigate to http://localhost:8081. This is the default URL for accessing Nexus.

Install Nexus using Docker

Master_academy

DevOps-Error solving

  • Kubernetes master Node problem errors solution:

Kubernetes Error Master Node in Ubuntu Server Version Vm

error execution phase wait-control-plane: couldn't initialize a Kubernetes cluster To see the stack trace of this error execute with --v=5 or higher.

  • Error Solve In follow Step By Step command:

    kubeadm reset -f

iptables -F && iptables -t nat -F && iptables -t mangle -F && iptables -X

cat > /etc/docker/daemon.json <<EOF

  • Select all Command:
{
  "exec-opts": ["native.cgroupdriver=systemd"],
  
  "log-driver": "json-file",
  
  "log-opts": {
  
   "max-size": "100m"
	
  },
  
  "storage-driver": "overlay2"
  
 }
EOF

systemctl daemon-reload

systemctl restart docker

swapoff -a

systemctl start kubelet

worker Node Errors problem solving Same procedure follow the Master Node

Master Node And Worker Node Tcp Errors Solving

Unable to connect to the server: dial tcp 192.168.0.101:6443: connect: no route to host

  • Solving Errors follow Command:

sudo -i

swapoff -a

exit

strace -eopenat kubectl version

kubectl get pods

  • Errors

the connection to the server localhost:8080 was refused - did you specify the right host or port?

  • Solving command
mkdir -p $HOME/.kube

sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

sudo chown $(id -u):$(id -g) $HOME/.kube/config

ubuntu server iso file setup in Vm link

Kubernetes deploy information link