Amazon linux2 EC2インスタンスにjavaをインストールしたいと思います。
立ち上げてsudo yum updateを実施後、javaが入っているか確認する
[ec2-user@ip-10-0-0-127 ~]$ java -version
-bash: java: command not found
入ってなさそうですね
javaを探す
[ec2-user@ip-10-0-0-127 ~]$ sudo yum search java
Loaded plugins: extras_suggestions, langpacks, priorities, update-motd
============================== N/S matched: java ===============================
aether-javadoc.noarch : Java API documentation for Aether
ant-antunit-javadoc.noarch : Javadoc for ant-antunit
ant-contrib-javadoc.noarch : Javadoc for ant-contrib
ant-javadoc.noarch : Javadoc for ant
ant-javamail.noarch : Optional javamail tasks for ant
antlr-javadoc.noarch : Javadoc for antlr
aopalliance-javadoc.noarch : API documentation for Java/J2EE AOP standards
apache-commons-beanutils-javadoc.noarch : Javadoc for apache-commons-beanutils
apache-commons-cli-javadoc.noarch : Javadoc for apache-commons-cli
apache-commons-collections-javadoc.noarch : Javadoc for
: apache-commons-collections
apache-commons-collections-testframework-javadoc.noarch : Javadoc for
: apache-commons-collections-testframework
apache-commons-dbcp-javadoc.noarch : Javadoc for apache-commons-dbcp
apache-commons-exec-javadoc.noarch : Javadocs for apache-commons-exec
apache-commons-jexl-javadoc.noarch : Javadocs for apache-commons-jexl
apache-commons-pool-javadoc.noarch : Javadoc for apache-commons-pool
apache-commons-validator-javadoc.noarch : Javadoc for apache-commons-validator
apache-commons-vfs-javadoc.noarch : Javadoc for apache-commons-vfs
apache-rat-javadoc.noarch : Javadocs for apache-rat
aqute-bnd-javadoc.noarch : Javadoc for aqute-bnd
aqute-bndlib-javadoc.noarch : Javadoc for aqute-bndlib....
要件に合わせて、JREまたはJDK（=javacなど開発系コマンドを含む）を選んでインストール
# JDK1.8.0をインストール
$ sudo yum install -y java-1.8.0-openjdk-devel.x86_64
Java8を有効化する
[ec2-user@ip-10-0-0-127 ~]$ sudo alternatives --config java
There is 1 program that provides 'java'.
Selection Command
-----------------------------------------------
*+ 1 java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.201.b09-0.amzn2.x86_64/jre/bin/java)
Enter to keep the current selection[+], or type selection number: 1
[ec2-user@ip-10-0-0-127 ~]$ java -version
openjdk version "1.8.0_201"
OpenJDK Runtime Environment (build 1.8.0_201-b09)
OpenJDK 64-Bit Server VM (build 25.201-b09, mixed mode)
おしまい