How to fix low disk space in Web App

Question

How to fix low disk space in Web App

SUSHI 5

Can you please tell me, I have Azure Service App (Linux plan) Premium v3 P0V3.

In the plan description it says that they give 250G.

I have 1 Web App in this plan with 2 slots (prod/stage), running Web App Single Container from ACR. When I SSH into the Web App and see df -h

root@aidwn24nad2:/var/log# df -h
Filesystem Size Used Avail Use% Mounted on
overlay 49G 43G 3.8G 92% /
tmpfs 64M 0 64M 0% /dev
tmpfs 2.2G 0 2.2G 0% /sys/fs/cgroup
shm 62M 8.0K 62M 1% /dev/shm
/dev/sda3 63G 13G 47G 22% /var/ssl
/dev/sdb1 49G 43G 3.8G 92% /etc/hosts
devtmpfs 4.0M 0 4.0M 0% /dev/tty
tmpfs 2.2G 0 2.2G 0% /proc/acpi
tmpfs 2.2G 0 2.2G 0% /proc/scsi
tmpfs 2.2G 0 2.2G 0% /sys/firmware
If anything the image weighs about 1.5-2G.

Please tell me where to find what takes up most of the space. If I use ncdu/df -h on / it shows 2-3G occupied. As I understood these 250G are distributed somewhere else, but I did not understand how.

In general, if anyone knows how to clear or how this space works in general, could you give me a hint, please? I'm so confused...

Vlad Costa 1,565 Reputation points

2024-06-18T23:15:02.8566667+00:00
Hi Sushi,

The Azure Service App (Linux plan) Premium v3 P0V3 provides 250GB of storage. However, this storage is not entirely allocated to your container's file system. It’s used by the underlying infrastructure and services that run your Web App, including the operating system, logs, temp files, etc.

When you SSH into your Web App and run df -h, you’re seeing the file system of your Docker container, not the entire allocated storage. The overlay filesystem you’re seeing is the writable layer of your Docker container, and its size is not directly related to the storage provided by your App Service Plan.

To find what’s taking up most of the space, you might also need to look into other directories. The command du -sh /* can be used to check the disk usage of all directories at the root level. This command can take a while to run on directories with many files.

If you’re looking to clear up space, you might want to consider the following:

Logs: Ensure that your application does not generate excessive logs. Over time, these can consume a significant amount of space.

Temp files: Some applications create temporary files that are not always cleaned up properly. Check your temp directories and clean them up if necessary.

Old or unused files: Files can accumulate in your storage over time. Check for and remove any files that are no longer needed regularly.

Remember, it’s important to understand what files you delete when cleaning up space. Removing the wrong files can cause your application to stop working.

If you find this response helpful and it resolves your issue, please consider marking it as “Accepted” or giving it an upvote. This will help others in the community find the solution more easily.
SUSHI 5 Reputation points

2024-06-19T08:19:19.2166667+00:00
Logs: Ensure that your application does not generate excessive logs. Over time, these can consume a significant amount of space.

Temp files: Some applications create temporary files that are not always cleaned up properly. Check your temp directories and clean them up if necessary.

Old or unused files: Files can accumulate in your storage over time. Check for and remove any files that are no longer needed regularly.

Where should I watch this? Should I go to the Web App itself or somewhere in the azure resources?

Thanks for your help <3

SUSHI 5

In my web app I have this

(app-3.12) root@8821aa441ff:/app# du -sh /*
140K    /appsvctmp
0       /bin
4.0K    /boot
0       /dev
3.0M    /etc
4.0K    /home
0       /lib
0       /lib64
4.0K    /media
4.0K    /mnt
4.0K    /opt
0       /proc
79M     /root
32K     /run
0       /sbin
4.0K    /srv
0       /sys
8.0K    /tmp
306M    /app
1.2G    /usr
262M    /var

The container itself is fine, nothing extra. Where else can I look?

SUSHI 5 Reputation points

2024-06-19T12:27:13.33+00:00

I'm getting this. It feels like the space in front of the hotspot is occupied and I can't get there. The image itself takes 2-3gb of space, + the operating system takes 15gb as far as I know. That is, by good should be free about 20gb, but free 4gb of 50gb. Logs are enabled, but there is a limit of 35mb per day. Insights are turned off. Where to look for what ate the space...

1 answer

Your answer

Vlad Costa 1,565 Reputation points

2024-06-18T23:15:02.8566667+00:00

Hi Sushi,

The Azure Service App (Linux plan) Premium v3 P0V3 provides 250GB of storage. However, this storage is not entirely allocated to your container's file system. It’s used by the underlying infrastructure and services that run your Web App, including the operating system, logs, temp files, etc.

When you SSH into your Web App and run df -h, you’re seeing the file system of your Docker container, not the entire allocated storage. The overlay filesystem you’re seeing is the writable layer of your Docker container, and its size is not directly related to the storage provided by your App Service Plan.

To find what’s taking up most of the space, you might also need to look into other directories. The command du -sh /* can be used to check the disk usage of all directories at the root level. This command can take a while to run on directories with many files.

If you’re looking to clear up space, you might want to consider the following:

Logs: Ensure that your application does not generate excessive logs. Over time, these can consume a significant amount of space.

Temp files: Some applications create temporary files that are not always cleaned up properly. Check your temp directories and clean them up if necessary.

Old or unused files: Files can accumulate in your storage over time. Check for and remove any files that are no longer needed regularly.

Remember, it’s important to understand what files you delete when cleaning up space. Removing the wrong files can cause your application to stop working.

If you find this response helpful and it resolves your issue, please consider marking it as “Accepted” or giving it an upvote. This will help others in the community find the solution more easily.
SUSHI 5 Reputation points

2024-06-19T08:19:19.2166667+00:00

Logs: Ensure that your application does not generate excessive logs. Over time, these can consume a significant amount of space.

Temp files: Some applications create temporary files that are not always cleaned up properly. Check your temp directories and clean them up if necessary.

Old or unused files: Files can accumulate in your storage over time. Check for and remove any files that are no longer needed regularly.

Where should I watch this? Should I go to the Web App itself or somewhere in the azure resources?

Thanks for your help <3
SUSHI 5 Reputation points

2024-06-19T09:09:36.4933333+00:00

In my web app I have this

(app-3.12) root@8821aa441ff:/app# du -sh /* 140K /appsvctmp 0 /bin 4.0K /boot 0 /dev 3.0M /etc 4.0K /home 0 /lib 0 /lib64 4.0K /media 4.0K /mnt 4.0K /opt 0 /proc 79M /root 32K /run 0 /sbin 4.0K /srv 0 /sys 8.0K /tmp 306M /app 1.2G /usr 262M /var

The container itself is fine, nothing extra. Where else can I look?
SUSHI 5 Reputation points

2024-06-19T12:27:13.33+00:00

I'm getting this. It feels like the space in front of the hotspot is occupied and I can't get there. The image itself takes 2-3gb of space, + the operating system takes 15gb as far as I know. That is, by good should be free about 20gb, but free 4gb of 50gb. Logs are enabled, but there is a limit of 35mb per day. Insights are turned off. Where to look for what ate the space...

Answer 1

@SUSHI Based on the output of the df -h command, it looks like you have the following space available on your filesystems:

/ (overlay): 3.8G available out of 49G
/var/ssl (/dev/sda3): 47G available out of 63G
/etc/hosts (/dev/sdb1): 3.8G available out of 49G

Summing up the available space:

3.8G+47G+3.8G=54.6G

So, you currently have approximately 54.6GB of free space.

Also keep in mind that a slot is a whole other web app behind the scenes. You basically have to double the space used.

Based on the df -h output you provided, here’s a breakdown of the space you’re using on each filesystem:

/ (overlay): 43G used out of 49G
/var/ssl (/dev/sda3): 13G used out of 63G
/etc/hosts (/dev/sdb1): 43G used out of 49G

Summing up the used space:

43G+13G+43G=99G

So, you are currently using approximately 99GB of space for prod. This also means that dev is also using 99GB. So 99GB+99GB=198GB

198GB (used)+54.6GB (free space) = 252.6GB

This usage seems normal. Let me know if you have any further questions. Otherwise, I would appreciate it if you could accept this answer.

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How to fix low disk space in Web App

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