运行 Zookeeper 3.4.12 和 Solr 6.5.1 with Systemd - Solr 在启动后立即关闭

Question

我是 systemd 和 zookeeper 的新手。请耐心等待，谢谢。感谢您的帮助！

设置：

Suse 12 企业版
没有init.d，只有systemd
zookeeper 3.4.12 运行正在通过 systemd 连接并侦听默认端口 2181
solr 6.5.1 也必须通过 systemd 运行，但在启动后 solr 立即决定因未知原因关闭
solr.log 显示建立与 zookeeper 的连接并在警告和关闭后不久
zookeeper 日志文件没有一行关于 solr 退出的信息

我很困惑，无法确定这个问题是 systemd 单元文件还是 zookeeper <-> solr 问题。

问题：

单元文件solr.service是否正确？（我不太确定，网上的例子很稀疏）
这是 systemd 问题还是 zookeeper 问题？
我可以打开哪些日志以获得更多信息？

As @MatsLindh points out this is an sytemd issue. Solr log WARN was just a coincident.

journalctl -u solr

Sep 05 16:42:36 mucs75561 systemd[1]: Started Apache Solr Service.
Sep 05 16:42:40 mucs75561 solr[15732]: [98B blob data]
Sep 05 16:42:40 mucs75561 solr[15732]: Started Solr server on port 8983 
(pid=15857). Happy searching!
Sep 05 16:42:40 mucs75561 solr[15942]: Sending stop command to Solr running on port 8983 ... 
waiting up to 180 seconds to allow Jetty process 15857 to stop gracefully.

solr.log讲述了一个不同的故事（tail -n 1000 -f /opt/xxx/solr-6.5.1/server/logs/solr.log）

cat /opt/xxx/solr-6.5.1/server/logs/solr.log
16:42:38.594 INFO  (main) [   ] o.e.j.s.Server jetty-9.3.14.v20161028
16:42:38.992 INFO  (main) [   ] o.a.s.s.SolrDispatchFilter  ___      _       Welcome to Apache Solr™ version 6.5.1
16:42:38.996 INFO  (main) [   ] o.a.s.s.SolrDispatchFilter / __| ___| |_ _   Starting in cloud mode on port 8983
16:42:38.996 INFO  (main) [   ] o.a.s.s.SolrDispatchFilter \__ \/ _ \ | '_|  Install dir: /opt/xxx/solr-6.5.1
16:42:39.016 INFO  (main) [   ] o.a.s.s.SolrDispatchFilter |___/\___/_|_|    Start time: 2018-09-05T16:42:38.998Z
16:42:39.017 INFO  (main) [   ] o.a.s.s.StartupLoggingUtils Property solr.log.muteconsole given. Muting ConsoleAppender named CONSOLE
16:42:39.035 INFO  (main) [   ] o.a.s.c.SolrResourceLoader Using system property solr.solr.home: /opt/xxx/solr-6.5.1/server/solr
16:42:39.099 INFO  (main) [   ] o.a.s.s.SolrDispatchFilter Loading solr.xml from SolrHome (not found in ZooKeeper)
16:42:39.100 INFO  (main) [   ] o.a.s.c.SolrXmlConfig Loading container configuration from /opt/xxx/solr-6.5.1/server/solr/solr.xml
16:42:39.413 INFO  (main) [   ] o.a.s.u.UpdateShardHandler Creating UpdateShardHandler HTTP client with params: socketTimeout=600000&connTimeout=60000&retry=true
16:42:39.418 INFO  (main) [   ] o.a.s.c.ZkContainer Zookeeper client=localhost:2181/solr
16:42:39.510 INFO  (main) [   ] o.a.s.c.Overseer Overseer (id=null) closing
16:42:39.514 INFO  (main) [   ] o.a.s.c.OverseerElectionContext I am going to be the leader 192.168.18.49:8983_solr
16:42:39.519 INFO  (main) [   ] o.a.s.c.Overseer Overseer (id=72167078483197975-192.168.18.49:8983_solr-n_0000000009) starting
16:42:39.616 INFO  (main) [   ] o.a.s.c.ZkController Register node as live in ZooKeeper:/live_nodes/192.168.18.49:8983_solr
16:42:39.622 INFO  (OverseerStateUpdate-72167078483197975-192.168.18.49:8983_solr-n_0000000009) [   ] o.a.s.c.c.ZkStateReader Updated live nodes from ZooKeeper... (0) -> (1)
16:42:39.812 INFO  (main) [   ] o.a.s.c.CorePropertiesLocator Found 0 core definitions underneath /opt/xxx/solr-6.5.1/server/solr
16:42:39.898 INFO  (main) [   ] o.e.j.s.Server Started @1864ms
16:42:40.549 INFO  (ShutdownMonitor) [   ] o.a.s.c.CoreContainer Shutting down CoreContainer instance=966739377
16:42:40.557 INFO  (ShutdownMonitor) [   ] o.a.s.c.Overseer Overseer (id=72167078483197975-192.168.18.49:8983_solr-n_0000000009) closing
16:42:40.558 INFO  (OverseerStateUpdate-72167078483197975-192.168.18.49:8983_solr-n_0000000009) [   ] o.a.s.c.Overseer Overseer Loop exiting : 192.168.18.49:8983_solr
16:42:40.566 WARN  (zkCallback-5-thread-1-processing-n:192.168.18.49:8983_solr) [   ] o.a.s.c.c.ZkStateReader ZooKeeper watch triggered, but Solr cannot talk to ZK: [KeeperErrorCode = Session expired for /live_nodes]
16:42:40.566 INFO  (ShutdownMonitor) [   ] o.a.s.m.SolrMetricManager Closing metric reporters for: solr.node

我的/etc/systemd/system/solr.服务：

[Unit]
Description=Apache Solr Service
After=syslog.target network.target nss-lookup.target
Requires=zookeeper.service

[Service]
User=xxx
Group=tomcat
WorkingDirectory=/opt/xxx/solr-6.5.1/
Environment=SOLR_INCLUDE=/opt/xxx/solr-6.5.1/bin/solr.in.sh   
ExecStart=/opt/xxx/solr-6.5.1/bin/solr start -m 4g -c -z localhost:2181/solr
ExecStop=/opt/xxx/solr-6.5.1/bin/solr stop -all

[Install]
WantedBy=default.target

感谢阅读！

Answer 1

systemd requires the service that it starts 保持运行。由于 Solr 启动脚本在启动 Solr 后退出（即它守护进程并将其留在后台运行），systemd 认为它已经死了并试图停止它。

您可以使用 bin/solr start -f:

在前台启动 solr

-f            Start Solr in foreground; default starts Solr in the background
              and sends stdout / stderr to solr-PORT-console.log

运行 Zookeeper 3.4.12 和 Solr 6.5.1 with Systemd - Solr 在启动后立即关闭

Running Zookeeper 3.4.12 and Solr 6.5.1 with Systemd - Solr immediately shuts down after starting

solr

systemd

apache-zookeeper