解决无/var/log/messages 问题

写好简单内核模块如hellomod.ko后，执行命令 insmod hellomod.ko 后，查看内核打印的printk信息， tail /var/log/messages 后发现并没有messages文件。

root@XXX:/home/river# vim /etc/rsyslog.d/50-default.conf

 

找到

    #
 33 # Some "catch-all" log files.
 34 #
 35 #*.=debug;
 36 #       auth,authpriv.none;
 37 #       news.none;mail.none     -/var/log/debug
 38 #*.=info;*.=notice;*.=warn;
 39 #       auth,authpriv.none;
 40 #       cron,daemon.none;
 41 #       mail,news.none          -/var/log/messages

 

把注释取消掉即可！

sudo restart rsyslog

此时，你查看messages仍然没有你想要的信息。因为这个文件相当于刚刚创立好。这时你可以重新

rmmod hellomod  #卸载内核模块
insmod hellomod.ko

然后

tail -f /var/log/messages

就可以查看相应的信息了。

May  5 11:38:25 RiverPc rsyslogd: [origin software="rsyslogd" swVersion="7.4.4" x-pid="3004" x-info="http://www.rsyslog.com
May  5 11:38:25 RiverPc rsyslogd: rsyslogd's groupid changed to 104
May  5 11:38:25 RiverPc rsyslogd: rsyslogd's userid changed to 101
May  5 11:38:27 RiverPc rsyslogd: [origin software="rsyslogd" swVersion="7.4.4" x-pid="3004" x-info="http://www.rsyslog.com
May  5 11:38:27 RiverPc rsyslogd: [origin software="rsyslogd" swVersion="7.4.4" x-pid="3018" x-info="http://www.rsyslog.com
May  5 11:38:27 RiverPc rsyslogd: rsyslogd's groupid changed to 104
May  5 11:38:27 RiverPc rsyslogd: rsyslogd's userid changed to 101
May  5 11:40:56 RiverPc kernel: [ 2464.029618] Good Bye
May  5 11:41:11 RiverPc kernel: [ 2478.760122] hello world!