SpringBoot服务无法读取系统变量,我进一步认识了profile和bashrc

in Troubleshooting with 14 comments, viewed 125 times

背景

CentOS服务器上,我们用Systemd部署了一个SpringBoot服务。这个服务会用ProcessBuilder去调用机器上一个C++的可执行文件。

问题描述

SpringBoot程序跑得很正常,但是我们发现C++程序却没有log输出,也就是说它从没被执行过。
查看了ProcessBuilder的返回值,是127127的意思是系统找不到对应的命令。于是我们把C++程序对应的目录(里面包括第三方动态链接库)添加到了LD_LIBRARY_PATH。怎么添加的呢?我们在~/.bash_profile脚本中添加了命令:

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/path/to/cppFoler/

经过测试,SpringBoot服务依然无法成功调用C++程序,依然返回127。但奇怪的是,当我们直接使用java -jar命令,并且用nohup的方式令SpringBoot程序跑在后台,可以正常调用C++程序:

nohup java -jar mySpringBoot.jar

问题分析

这里就不得不说Linuxnohupservice的区别了。

回到我们的问题,nohup的方式可以工作,而service不行,说明前面设置的LD_LIBRARY_PATH参数只对nohup生效,对service无效。这让我去重新学习了CentOS~/.bash_profile脚本,以及相关的/etc/profile~/.bashrc/etc/bashrc

System wide environment and startup programs, for login setup. Functions and aliases go in /etc/bashrc. It's NOT a good idea to change this file unless you know what you are doing. It's much better to create a custom.sh shell script in /etc/profile.d/ to make custom changes to your environment, as this will prevent the need for merging in future updates.

System wide functions and aliases, Environment stuff goes in /etc/profile.

到这里,问题已经明朗了,我们在~/.bash_profile中设置的环境变量,只对shell所对应的进程生效,而对后台的service无效。当用nohup方式执行程序的时候,因为还是在shell对应的线程中,所以可以正常读到设置的环境变量。

问题解决

解决办法是,给service独立设置环境变量。这里有两种方式。

1. Systemd Environment

Systemd Service的配置文件中,显示指定Environment参数,来设置service运行时的环境变量,如:

[Unit]
Description=My SpringBoot Service
After=syslog.target

[Service]
User=nightfield
ExecStart=/path/to/mySpringBoot.jar
SuccessExitStatus=143
Restart=always
RestartSec=5
Environment="LD_LIBRARY_PATH=/path/to/cppFoler/"

[Install]
WantedBy=multi-user.target

这样,service运行的时候,就可以正确读到对应的变量。

2. ProcessBuild中指定environment()

ProcessBuild可以通过environment()方法,设置process运行的环境参数:

ProcessBuilder pb = new ProcessBuilder("java -version");
Map<String, String> env = pb.environment();
env.put("LD_LIBRARY_PATH", "/path/to/cppFoler/");
Process p = pb.start();

总结

通过这个问题,更深刻地学习了nohupservice的区别,profilebashrc的适用场景。

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