Linux 日志中出现报错的原因非常广泛，通常可以分为几大类。下面我按常见原因 → 排查思路 → 典型示例来说明，你可以对照自己的情况判断。
No space left on device）典型日志：
No space left on device
Out of memory: Kill process
Too many open files
典型日志：
Failed to start nginx.service
Permission denied
Address already in use
典型日志：
error while loading shared libraries
command not found
syntax error near unexpected token
典型日志：
Could not resolve host
Connection timed out
No route to host
典型日志：
I/O error
kernel panic
segfault at ...
典型日志：
authentication failure
Failed password for root
journalctl -xe
或
less /var/log/messages
less /var/log/syslog
journalctl -u nginx
tail -f /var/log/messages
df -h
free -h
top
如果你愿意，可以告诉我：
我可以直接帮你分析具体原因和解决办法。
