如何配置系统日志，以便应用程序日志转到特定文件

问题描述

我有一个应用程序 myapp ，该应用程序应将日志文件仅 发送到/var/log/myapp.log . myapp 用C ++编写.以下示例代码仅将日志发送到/var/log/syslog.具体来说，我的操作系统是Linux-Ubuntu 12.04.我还发现我的计算机上安装的rsyslog大于syslog.

I have an application myapp which should send log files only to /var/log/myapp.log. myapp is written in C++. The following sample code, sends the logs to /var/log/syslog only. My os is Linux - Ubuntu 12.04 - to be specific. I also found that my machine has rsyslog than syslog installed.

#include <stdio.h>
#include <unistd.h>
#include <syslog.h>

int main(void) {
    openlog("myapp", LOG_PID|LOG_CONS, LOG_USER);
    syslog(LOG_INFO, "abc 10");
    closelog();
    return 0;
}

推荐答案

根据 syslog(3) 联机帮助页，openlog() 的第一个参数设置日志消息的前缀，而不是文件名.您可以使用LOG_LOCAL0之类的工具来标记输出，然后使用/etc/syslog.conf 配置syslogd将这些日志发送到您想要的文件.

According to the syslog(3) manpage, the first parameter for openlog() sets a prefix for log messages, not a filename.You can use a facility like LOG_LOCAL0 to flag your output and then configure syslogd using /etc/syslog.conf to send those logs to the file of your desire.

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