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Test FTP Access Remotely on CentOS
This section provides a tutorial example on how to update firewall on the vsftpd server (and its firewall gateway if it is served in the cloud) to open ports 21 and 30000-31000 for inbound connections.
2024-01-03, 118🔥, 0💬

Verify Apache Web Server "httpd"
This section provides a tutorial example on how to manage Apache Web Server 'httpd' on CentOS 8 systems, and how to publish HTML documents and PHP scripts..
2022-10-01, 117🔥, 0💬

"systemctl status/start/stop/enable/disable" Commands
This section provides a quick introduction of the 'systemctl' command, which allows you to start or stop a system service, check the status of a service, and enable or disable a service at the boot time.
2023-08-02, 116🔥, 0💬

Install Apache Tomcat on Linux
This section provides a tutorial example on how to install Apache Tomcat on Linux systems.
2024-04-12, 115🔥, 0💬

Reset Host Name on Linux Systems
This section provides a tutorial example on how to view and change host name settings on Linux systems.
2023-05-27, 115🔥, 0💬

Common Issues with Apache HTTPS Support
This section provides examples of some common issues related to HTTPS support on Apache HTTP Server.
2024-04-12, 113🔥, 0💬

Install and Manage Python Engine on CentOS
This section provides a tutorial example on how to install Python 3.6 on CentOS 8 systems using 'dnf/yum' as the package manager.
2022-10-01, 112🔥, 0💬

Postfix - Mail Transport Agent (MTA)
This chapter provides introductions and tutorial examples about Postfix - Mail Transport Agent (MTA). Topics include installing, configuring, and starting Postfix; testing Postfix using STMP commands with 'telnet'; turn on 'SMTP Submission' and 'SMTPS' services; using 'postconf' command.
2022-10-01, 111🔥, 0💬

SSL/TLS Support on Tomcat 8 or Older
This section provides a tutorial example on how to configure Tomcat 8 or older to support SSL/TLS for the HTTPS service.
2024-04-12, 110🔥, 0💬

Upgrade OpenJDK on CentOS
This section provides a tutorial example on how to upgrade OpenJDK on CentOS 8 systems using package manager 'dnf/yum' and symbolic link manager 'update-alternatives' symbolic links for 'java/javac' command.
2024-04-12, 110🔥, 0💬

Requirements for Supporting HTTPS on Apache
This section provides a brief summary of requirements on configuring the Apache HTTP Server to support the HTTPS protocol.
2024-04-12, 109🔥, 0💬

Web Server Certificate and Required Fields
This section provides information on how to obtain a Web server certificate and verify its required fields. An example of server certificate is also provided.
2024-04-12, 109🔥, 0💬

"cURL" - Client for URL
This section provides a tutorial example on how to use 'cURL' command to send requests to a remote server in different protocols in URL format.
2023-05-24, 109🔥, 0💬

Dovecot - IMAP and POP3 Server
This chapter provides introductions and tutorial examples about Dovecot - IMAP and POP3 Server. Topics include installing, configuring, and starting Dovecot; testing Dovecot server using POP3 and IMAP commands with 'telnet'.
2022-10-01, 109🔥, 0💬

Common Issues on Running Tomcat
This section provides some examples of issues on running Apache Tomcat on Linux systems.
2024-04-12, 108🔥, 0💬

First Java Program - Hello.java
This section provides a tutorial example on how to write, compile, and execute the first Java program, Hello.java, with OpenJDK.
2024-04-12, 108🔥, 0💬

Thunderbird Configuratin for SMTPS Service
This section provides a tutorial example on how to configure Thunderbird use SMTPS (SMTP with SSL/TLS) service to securely sending out new emails.
2022-10-01, 108🔥, 0💬

Apache Configuration for HTTPS Protocol
This section provides a tutorial example on how to install Web server certificates and configure Apache HTTP Server to support the HTTPS protocol.
2024-04-12, 107🔥, 0💬

What Is Apache HTTP Server "httpd"
This section provides a quick introduction of Apache HTTP Server, also referred as HTTP daemon or httpd.
2024-04-12, 107🔥, 0💬

OpenJDK - Open-Source JDK
This chapter provides introductions and tutorial examples on OpenJDK. Topics include installing and upgrading OpenJDK JRE and JDK packages; using 'update-alternatives' command to update symbolic links for default commands; compiling and running Java programs.
2024-04-12, 107🔥, 0💬

Running Apache Tomcat on Linux Systems
This chapter provides introductions and tutorial on Apache Tomcat server for Linux systems. Topics include installing Apache Tomcat; starting/stopping Tomcat; opening firewall for port 80; configuring SSL/TLS for HTTPS connections.
2024-04-12, 107🔥, 0💬

Listen to Non-Standard Ports with Apache
This section provides a tutorial example on how to add virtual hosts to listen to additional ports other than standard ports (80 and 443) with and without systemd Socket Activation service.
2024-04-12, 107🔥, 0💬

What Is Apache Tomcat
This section provides a quick introduction of Apache Tomcat, a Java application server, or as a Java servlet container.
2024-04-12, 106🔥, 0💬

Install and Manage OpenJDK on CentOS
This section provides a tutorial example on how to install OpenJDK on CentOS 8 systems using 'dnf/yum' as the package manager.
2024-04-12, 105🔥, 0💬

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