Ubuntu をアップデート後、Jenkins が起動しなくなってしまった。
Jenkins 起動不全
$ systemctl status jenkins.service
● jenkins.service - LSB: Start Jenkins at boot time
Loaded: loaded (/etc/init.d/jenkins; generated)
Active: failed (Result: exit-code) since Sun 2020-11-15 14:20:39 UTC; 19s ago
Docs: man:systemd-sysv-generator(8)
Process: 1591 ExecStart=/etc/init.d/jenkins start (code=exited, status=1/FAILURE)
Nov 15 14:20:39 ip-172-31-83-123 systemd[1]: Starting LSB: Start Jenkins at boot time...
Nov 15 14:20:39 ip-172-31-83-123 jenkins[1591]: Found an incorrect Java version
Nov 15 14:20:39 ip-172-31-83-123 jenkins[1591]: Java version found:
Nov 15 14:20:39 ip-172-31-83-123 jenkins[1591]: openjdk version "11.0.9.1" 2020-11-04
Nov 15 14:20:39 ip-172-31-83-123 jenkins[1591]: OpenJDK Runtime Environment (build 11.0.9.1+1-Ubuntu-0ubuntu1.18.04)
Nov 15 14:20:39 ip-172-31-83-123 jenkins[1591]: OpenJDK 64-Bit Server VM (build 11.0.9.1+1-Ubuntu-0ubuntu1.18.04, mixed mode, sharing)
Nov 15 14:20:39 ip-172-31-83-123 jenkins[1591]: Aborting
Nov 15 14:20:39 ip-172-31-83-123 systemd[1]: jenkins.service: Control process exited, code=exited status=1
Nov 15 14:20:39 ip-172-31-83-123 systemd[1]: jenkins.service: Failed with result 'exit-code'.
Nov 15 14:20:39 ip-172-31-83-123 systemd[1]: Failed to start LSB: Start Jenkins at boot time.
解消方法
/etc/init.d/jenkins を以下のように編集
【Before】
# Which Java versions can be used to run Jenkins
JAVA_ALLOWED_VERSIONS=( "18" "110" )
【After】
# Which Java versions can be used to run Jenkins
JAVA_ALLOWED_VERSIONS=( "18" "110" "11.09" )
Jenkins 再起動
$ sudo systemctl restart jenkins
Warning: The unit file, source configuration file or drop-ins of jenkins.service changed on disk. Run 'systemctl daemon-reload' to reload units.
原因
以下のコマンドで Ubuntu をアップデートした際、Java のバージョンが上がってしまった模様
$ sudo apt update
$ sudo apt dist-upgrade
$ sudo apt autoremove