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Installing Java on CentOS 7 & Red Hat Enterprise Linux 7

Installing Java 11 (OpenJDK) on CentOS 7 and RHEL 7 with yum, plus picking an alternative version — a short step-by-step guide.

javalinux
  1. sudo -i
  2. yum update
  3. yum list available java*
  4. yum install java-11-openjdk
  5. alternatives –config java
  6. choose the one you want

More posts

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$ javac Main.java
$ java Main
Hello, World!
November 1, 2026java

What's New in Java 21: Virtual Threads, Records and Pattern Matching

The Java 21 LTS features that change day-to-day code the most — virtual threads, records, switch pattern matching, record patterns, sealed classes and sequenced collections.

$ ssh deploy@server
$ systemctl status app
$ journalctl -u app -f
$ df -h
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SSH Config, Key Management and Tunneling

Generating ed25519 keys, ssh-agent, shortcuts with ~/.ssh/config, jump hosts, port forwarding (-L, -R, -D) and server-side hardening.

$ ssh deploy@server
$ systemctl status app
$ journalctl -u app -f
$ df -h
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Writing a Linux Service with systemd

Running an app as a systemd service — unit files, restart policies, environment variables, reading logs with journalctl, and scheduled jobs with timers.