我的网站是一个新网站，用户不到 200 人，VPS ROM 为 90G，但今天我的网站出现了 502 Bad Gateway nginx。
下午我收到一封邮件：
download_remote_images_to_local 设置已禁用，因为已达到 download_remote_images_threshold 的磁盘空间限制。
最后我发现是因为空间不足，以下是一些信息：
root@kehan:/var/discourse# ./launcher rebuild app
x86_64 arch detected.
You have less than 5GB of free space on the disk where /var/lib/docker is located. You will need more space to continue
Filesystem Size Used Avail Use% Mounted on
/dev/vda1 88G 84G 0 100% /
Would you like to attempt to recover space by cleaning docker images and containers in the system? (y/N)y
If the cleanup was successful, you may try again now
root@kehan:/var/discourse# ./launcher rebuild app
x86_64 arch detected.
WARNING: We are about to start downloading the Discourse base image
This process may take anywhere between a few minutes to an hour, depending on your network speed
Please be patient
2.0.20240825-0027: Pulling from discourse/base
Digest: sha256:6de68cb49198b5281f79ed9401b3fe818c854d220dcf0238549fe2f2adb19146
Status: Downloaded newer image for discourse/base:2.0.20240825-0027
docker.io/discourse/base:2.0.20240825-0027
You have less than 5GB of free space on the disk where /var/lib/docker is located. You will need more space to continue
Filesystem Size Used Avail Use% Mounted on
/dev/vda1 88G 84G 0 100% /
Would you like to attempt to recover space by cleaning docker images and containers in the system? (y/N)y
If the cleanup was successful, you may try again now
root@kehan:/var/discourse# du -sh /* | sort -h
du: cannot access '/proc/8758/task/8758/fd/4': No such file or directory
du: cannot access '/proc/8758/task/8758/fdinfo/4': No such file or directory
du: cannot access '/proc/8758/fd/3': No such file or directory
du: cannot access '/proc/8758/fdinfo/3': No such file or directory
0 /bin
0 /dev
0 /initrd.img
0 /initrd.img.old
0 /lib
0 /lib32
0 /lib64
0 /libx32
0 /proc
0 /sbin
0 /sys
0 /vmlinuz
0 /vmlinuz.old
4.0K /home
4.0K /mnt
4.0K /srv
8.0K /media
16K /lost+found
16K /opt
36K /tmp
48K /root
568K /run
3.8M /etc
56M /boot
1.4G /usr
2.1G /swapfile
87G /var
root@kehan:/var/discourse# du -sh /var/* | sort -h
0 /var/lock
0 /var/run
4.0K /var/local
4.0K /var/mail
4.0K /var/opt
12K /var/spool
20K /var/tmp
408K /var/backups
114M /var/log
290M /var/cache
17G /var/lib
70G /var/discourse
root@kehan:/var/discourse# du -sh /var/discourse/* | sort -h
4.0K /var/discourse/bin
4.0K /var/discourse/cids
4.0K /var/discourse/LICENSE
8.0K /var/discourse/scripts
12K /var/discourse/discourse-doctor
12K /var/discourse/README.md
20K /var/discourse/containers
24K /var/discourse/launcher
24K /var/discourse/tests
28K /var/discourse/discourse-setup
32K /var/discourse/samples
180K /var/discourse/launcher_go
180K /var/discourse/templates
232K /var/discourse/image
70G /var/discourse/shared
root@kehan:/var/discourse# ^C
root@kehan:/var/discourse# du -sh /var/discourse/shared/* | sort -h
70G /var/discourse/shared/standalone
root@kehan:/var/discourse# du -sh /var/discourse/shared/standalone
70G /var/discourse/shared/standalone
root@kehan:/var/discourse# cd /var/discourse/shared/standalone
du -sh *
5.8M backups
1.8M letsencrypt
70G log
4.0K postgres_backup
110M postgres_data
180K postgres_run
11M redis_data
20K ssl
28K state
12K tmp
11M uploads
我的网站今天下午可能遭受了 DDoS 攻击。这些日志文件可能是 DDoS 日志吗？
谁能告诉我如何解决这个问题？