Go语言视频零基础入门到精通

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1.官网上下载Logstash 6.5.4.npm包之后，添加到yum仓库；
2.使用yum install logstash 安装npm包，包安装成功，查看systemctl status logstash 任务启动失败

1. [root@worker1 ~]# service logstash status
2. Redirecting to /bin/systemctl status  logstash.service
3. ● logstash.service - logstash
4.    Loaded: loaded (/etc/systemd/system/logstash.service; disabled; vendor preset: disabled)
5.    Active: failed (Result: start-limit) since Thu 2019-01-17 11:03:03 CST; 1 day 23h ago
6.   Process: 5848 ExecStart=/usr/share/logstash/bin/logstash --path.settings /etc/logstash (code=exited, status=1/FAILURE)
7. Main PID: 5848 (code=exited, status=1/FAILURE)
9. Jan 17 11:03:03 worker1.n1 systemd[1]: Unit logstash.service entered failed state.
10. Jan 17 11:03:03 worker1.n1 systemd[1]: logstash.service failed.
11. Jan 17 11:03:03 worker1.n1 systemd[1]: logstash.service holdoff time over, scheduling restart.
12. Jan 17 11:03:03 worker1.n1 systemd[1]: start request repeated too quickly for logstash.service
13. Jan 17 11:03:03 worker1.n1 systemd[1]: Failed to start logstash.
14. Jan 17 11:03:03 worker1.n1 systemd[1]: Unit logstash.service entered failed state.
15. Jan 17 11:03:03 worker1.n1 systemd[1]: logstash.service failed.

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3. 单独启动logstash，/usr/share/logstash/bin/logstash --path.settings /etc/logstash ，logstash可以正常启动，所以判断为启动项的问题，
查看systemctl的启动项，/etc/systemd/system/logstash.service
  

1. [root@worker1 ~]# vi /etc/systemd/system/logstash.service
3. [Unit]
4. Description=logstash
6. [Service]
7. Type=simple
8. User=logstash
9. Group=logstash
10. # Load env vars from /etc/default/ and /etc/sysconfig/ if they exist.
11. # Prefixing the path with "-" makes it try to load, but if the file doesn"t
12. # exist, it continues onward.
13. EnvironmentFile=-/etc/default/logstash
14. EnvironmentFile=-/etc/sysconfig/logstash
15. ExecStart=/usr/share/logstash/bin/logstash "--path.settings" "/etc/logstash"
16. Restart=always
17. WorkingDirectory=/
18. Nice=19
19. LimitNOFILE=16384
21. [Install]
22. WantedBy=multi-user.target

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以为是权限问题，更改user，group为root， 执行 systemctl daemon-reload 让配置生效
重新启动logstash，  
systemctl start logstash 查看 systemctl status logstash，
依旧不能以服务的方式启动
  
4.使用journalctl -ex 查看，发现没有指定java_HOME,

1. Jan 19 10:17:15 worker1.n1 logstash[28297]: could not find java; set JAVA_HOME or ensure java is in PATH
2. Jan 19 10:17:15 worker1.n1 systemd[1]: logstash.service: main process exited, code=exited, status=1/FAILURE
3. Jan 19 10:17:15 worker1.n1 systemd[1]: Unit logstash.service entered failed state.
4. Jan 19 10:17:15 worker1.n1 systemd[1]: logstash.service failed.
5. Jan 19 10:17:15 worker1.n1 systemd[1]: logstash.service holdoff time over, scheduling restart.
6. Jan 19 10:17:15 worker1.n1 systemd[1]: start request repeated too quickly for logstash.service
7. Jan 19 10:17:15 worker1.n1 systemd[1]: Failed to start logstash.
8. -- Subject: Unit logstash.service has failed
9. -- Defined-By: systemd
10. -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
11. --
12. -- Unit logstash.service has failed

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echo $JAVA_HOME, 查看本地env都有配置，可能是logstash启动的时候没有读取到系统的JAVA_HOME环境；
  
5.在logstash 以server启动的时候加入启动项JAVA_HOME
vi /etc/sysconfig/logstash
增加JAVA_HOME路径
  
6.改回vi /etc/sysconfig/logstash的权限为初始的logstash，重启logstash，服务可以正常启动了

1. ● logstash.service - logstash
2.    Loaded: loaded (/etc/systemd/system/logstash.service; disabled; vendor preset: disabled)
3.    Active: active (running) since Sat 2019-01-19 10:21:24 CST; 4s ago
4. Main PID: 26014 (java)
5.    CGroup: /system.slice/logstash.service
6.            └─26014 /usr/local/jdk/latest/bin/java -Xms1g -Xmx1g -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly -Djava.awt.headless=true -Dfile.encoding=UTF-8 -Djruby.compi...

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