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 Install Tomcat 9 to configure Java Application Server. [1].  Install Java Runtime Environment, refer to here. [2]. Install Tomcat 9. Make sure the latest version and source URL on download site. ⇒ https://tomcat.apache.org/download-90.cgi [root@dlp ~]# curl -O http://ftp.riken.jp/net/apache/tomcat/tomcat-9/v9.0.29/bin/apache-tomcat-9.0.29.tar.gz [root@dlp ~]# tar zxvf apache-tomcat-9.0.29.tar.gz [root@dlp ~]# mv apache-tomcat-9.0.29 /usr/libexec/tomcat9 [root@dlp ~]# useradd -M -d /usr/libexec/tomcat9 tomcat [root@dlp ~]# chown -R tomcat. /usr/libexec/tomcat9 [3]. Create a Systemd Setting file. [root@dlp ~]# vi /usr/lib/systemd/system/tomcat9.service # create new [Unit] Description=Apache Tomcat 9 After=network.target [Service] Type=oneshot ExecStart=/usr/libexec/tomcat9/bin/startup.sh ExecStop=/usr/libexec/tomcat9/bin/shutdown.sh RemainAfterExit=yes User=tomcat Group=tomcat [Install] WantedBy=multi-user.target [root@dlp ~]# systemctl enable --now tomcat9 [4]. If SELinu...

  Install OpenJDK 8. [1]. If you need only JRE, Install only [java-1.8.0-openjdk] package, but if you need compiler, Install [java-1.8.0-openjdk-devel] package, too. [root@dlp ~]# dnf -y install java-1.8.0-openjdk java-1.8.0-openjdk-devel [root@dlp ~]# cat > /etc/profile.d/java.sh <<'EOF' export JAVA_HOME=$(dirname $(dirname $(readlink $(readlink $(which java))))) export PATH=$PATH:$JAVA_HOME/bin EOF [root@dlp ~]# source /etc/profile.d/java.sh [root@dlp ~]# java -version openjdk version "1.8.0_232" OpenJDK Runtime Environment (build 1.8.0_232-b09) OpenJDK 64-Bit Server VM (build 25.232-b09, mixed mode) # verify to create test program [root@dlp ~]# cat > java_test.java <<'EOF' class java_test {     public static void main(String[] args) {         System.out.println("Hello Java World !");     } } EOF  [root@dlp ~]# javac java_test.java [root@dlp ~]# java java_test Hello Java World ! [2]. If you installed multiple ve...

 Install OpenJDK 11. [1]. If you need only JRE, Install only [java-11-openjdk] package, but if you need compiler, Install [java-11-openjdk-devel] package, too. [root@dlp ~]# dnf -y install java-11-openjdk java-11-openjdk-devel [root@dlp ~]# cat > /etc/profile.d/java.sh <<'EOF' export JAVA_HOME=$(dirname $(dirname $(readlink $(readlink $(which java))))) export PATH=$PATH:$JAVA_HOME/bin EOF [root@dlp ~]# source /etc/profile.d/java.sh [root@dlp ~]# java --version openjdk 11.0.5 2019-10-15 LTS OpenJDK Runtime Environment 18.9 (build 11.0.5+10-LTS) OpenJDK 64-Bit Server VM 18.9 (build 11.0.5+10-LTS, mixed mode, sharing) # verify to create test program [root@dlp ~]# cat > java_test.java <<'EOF' class java_test {     public static void main(String[] args) {         System.out.println("Hello Java World !");     } } EOF  [root@dlp ~]# javac java_test.java [root@dlp ~]# java java_test Hello Java World ! [2]. If you installed ...

 Install TensorFlow which is the Machine Learning Library. On this example, Install TensorFlow official Docker Image without GPU support and run it on Containers. [1].  Install Podman, refer to here. [2]. Install TensorFlow Docker (CPU only). # pull TensorFlow 2.0 with Python3 image [cent@dlp ~]$ podman pull tensorflow/tensorflow:2.0.0-py3 [cent@dlp ~]$ podman images REPOSITORY                        TAG         IMAGE ID       CREATED        SIZE docker.io/tensorflow/tensorflow   2.0.0-py3   90f5cb97b18f   9 months ago   1.09 GB # run container [cent@dlp ~]$ podman run --rm tensorflow/tensorflow:2.0.0-py3 \ python -c "import tensorflow as tf; print(tf.reduce_sum(tf.random.normal([1000, 1000])))" 2020-07-22 05:21:27.138093: I tensorflow/core/platform/profile_utils/cpu_utils.cc:94] CPU Frequency: 2801480000 Hz 2020...

 Install Podman that is Container management tool. It's possible to use the same ease of use of Docker Cli and also Podman does not need specific Service Daemon. [1]. Install Podman. [root@dlp ~]# dnf -y install podman [2]. Download an official image and create a Container and output the words [Welcome to the Podman World] inside the Container. # download official image [root@dlp ~]# podman pull centos Trying to pull docker.io/centos:latest...Getting image source signatures Copying blob 729ec3a6ada3: 68.21 MiB / 68.21 MiB  4s Copying config 0f3e07c0138f: 2.13 KiB / 2.13 KiB  0s Writing manifest to image destination Storing signatures 0f3e07c0138fbe05abcb7a9cc7d63d9bd4c980c3f61fea5efa32e7c4217ef4da # run echo inside Container [root@dlp ~]# podman run centos /bin/echo "Welcome to the Podman World" Welcome to the Podman World [3]. Connect to the interactive session of a Container with [i] and [t] option like follows. If [exit] from the Container session, the process of...

  Install Scala 2.10. [1]. Make sure the current enabled version of Scala and Install it. [root@dlp ~]# dnf module list scala CentOS-8 - AppStream Name  Stream   Profiles  Summary scala 2.10 [d] common [d A hybrid functional/object-oriented language for the JV                ]         M Hint: [d]efault, [e]nabled, [x]disabled, [i]nstalled # install Scala 2.10 [root@dlp ~]# dnf module -y install scala:2.10 [root@dlp ~]# scala -version Scala code runner version 2.10.6 -- Copyright 2002-2013, LAMP/EPFL [2]. Run Scala REPL (Read Eval Print Loop) which is the interactive shell to Test Scala. [root@dlp ~]# scala Welcome to Scala version 2.10.6 (OpenJDK 64-Bit Server VM, Java 1.8.0_232). Type in expressions to have them evaluated. Type :help for more information. # print words scala> println("Hello Scala World") Hello Scala World # set constants scala> val msg:String = "Hello Scala World" msg:...

 Install Perl 5.26. [1].  Make sure the available version of Perl and Install it. [root@dlp ~]# dnf module list perl CentOS-8 - AppStream Name   Stream     Profiles             Summary perl   5.24       common [d], minimal  Practical Extraction and Report Language perl   5.26 [d]   common [d], minimal  Practical Extraction and Report Language Hint: [d]efault, [e]nabled, [x]disabled, [i]nstalled # install Perl 5.26 [root@dlp ~]# dnf module -y install perl:5.26 Dependencies resolved. ========================================================  Package       Arch     Version              Repository   Size ======================================================== Upgrading:  perl        x86_64   4:5.26.3-416.el8     AppStream  ...