How to view the Linux system log of the cloud server?

To view the Linux system logs on a cloud server, you can use several standard commands and tools. Here's how:

Check logs in /var/log/:
Most Linux system logs are stored in the /var/log/ directory. Common logs include:
- /var/log/syslog or /var/log/messages (general system logs)
- /var/log/auth.log (authentication logs, e.g., SSH login attempts)
- /var/log/kern.log (kernel-related logs)
- /var/log/dmesg (boot and hardware-related logs)
Example:
```
cat /var/log/syslog
```
Or use less for easier navigation:
```
less /var/log/syslog
```
Use journalctl (for systems with systemd):
If your cloud server uses systemd, you can view logs with journalctl.

Example:
```
journalctl -xe  # View recent logs with detailed explanations
```
To filter logs by a specific service (e.g., sshd):
```
journalctl -u sshd
```
Check boot logs with dmesg:
To view kernel and hardware-related logs:
```
dmesg | less
```
Monitor logs in real-time with tail:
Use tail -f to follow log updates in real-time.

Example:
```
tail -f /var/log/syslog
```

For cloud servers, Tencent Cloud provides enhanced log management services:

Tencent Cloud Log Service (CLS): Collects, stores, and analyzes logs from cloud servers, making it easier to search and monitor logs. You can integrate CLS with your Linux server to centralize log management.
Cloud Monitor: Helps track system performance and logs, providing alerts for critical events.

These tools simplify log analysis and troubleshooting for cloud-based Linux servers.