koo6357/aws-jenkins.md

## aws-jenkins.md

      
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              aws-jenkins.md
            
          
    sudo wget -O /etc/yum.repos.d/jenkins.repo http://pkg.jenkins-ci.org/redhat/jenkins.repo
sudo rpm --import https://jenkins-ci.org/redhat/jenkins-ci.org.key
sudo yum install jenkins java
sudo chkconfig --add jenkins
sudo systemctl start jenkins
ERROR 발생
SEVERE: Running with Java class version 51, which is older than the Minimum required version 52. See https://jenkins.io/redirect/java-support/
java.lang.UnsupportedClassVersionError: 51.0
	at Main.verifyJavaVersion(Main.java:182)
	at Main.main(Main.java:142)

Jenkins requires Java versions [8, 11] but you are running with Java 1.7 from /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.231.x86_64/jre
java.lang.UnsupportedClassVersionError: 51.0
	at Main.verifyJavaVersion(Main.java:182)
	at Main.main(Main.java:142)

젠킨스는 자바 8 ~ 11을 지원한다는 내용이고 aws ec2에서 기본제공은 자바 7버전인듯
v7 삭제
sudo yum remove java-1.7.0-openjdk
v8 설치 및 확인
sudo yum install -y java-1.8.0-openjdk-devel.x86_64
sudo /usr/sbin/alternatives --config java
java -version
sudo systemctl start jenkins
재입력후 정상작동확인