getting error : No space left on device in aws server - amazon-web-services

Question

i created instance one month ago, it was working fine, but suddenly it stopped working, its strange, when i logged in with ssh, i used command df -h, i can some of that process are showing 100%, looks like cause of that i am getting that issue : No space left on device, i tried attach volume, but still it is not working, can anyone please help me how to resolve this issue ? here i have attacked my process
Filesystem Size Used Avail Use% Mounted on
udev 3.9G 0 3.9G 0% /dev
tmpfs 787M 80M 707M 11% /run
/dev/nvme0n1p1 7.7G 7.7G 0 100% /
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/loop0 29M 29M 0 100% /snap/amazon-ssm-agent/2012
/dev/loop1 97M 97M 0 100% /snap/core/9436
/dev/loop2 18M 18M 0 100% /snap/amazon-ssm-agent/1566
/dev/loop3 98M 98M 0 100% /snap/core/9289
tmpfs 787M 0 787M 0% /run/user/1000

Answer 1

First of all dont panic. It can be easily solved.
Steps
use the following command to see the memory status of your machine
df-h
This will dosplay the list of mounted volume on file system
Filesystem Size Used Avail Use% Mounted on
udev 992M 0 992M 0% /dev
tmpfs 200M 21M 180M 11% /run
/dev/xvda1 7.7G 7.7G 0 100% /
tmpfs 1000M 0 1000M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 1000M 0 1000M 0% /sys/fs/cgroup
tmpfs 200M 0 200M 0% /run/user/1000
You can see that /dev/xvda1 is full.
To peek in /dev/xvda1 further issue following command
sudo du -shx /* | sort -h
This will hive the folderwise memory consumed like
4.0K /mnt
4.0K /srv
16K /lost+found
16K /opt
24K /snap
32K /tmp
532K /home
7.0M /etc
14M /sbin
16M /bin
42M /run
76M /boot
186M /lib
195M /root
2.2G /usr
5.1G /var
we can see that /usr and /var are consuming highest memory.
just drill down in these folders and remove unnecessary files
Go in aws ec2 instance and reboot it.
Problem solved.