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Azure instances have temporary storage, on Linux instances, it's not mounted by default.
For example, let's have a look at B1ms:
B1ls is available only on Linux for the best customer experience. Windows is not supported because the minimum recommended memory for the Windows OS is larger than what B1ls offers.
Open an SSH session to your Azure Linux instance and run these commands as root or using sudo:

And some words of caution:

I hope this tutorial been useful for you, feel free to post your questions or comments down below
For example, let's have a look at B1ms:
B1ls is available only on Linux for the best customer experience. Windows is not supported because the minimum recommended memory for the Windows OS is larger than what B1ls offers.
Open an SSH session to your Azure Linux instance and run these commands as root or using sudo:
- Test the available disk space for your instance:
- andy@thelounge:~$ df -h
- Edit the Azure Linux Agent configuration file:
- andy@thelounge:~$ sudo nano /etc/waagent.conf
- Update these parameters:
- ResourceDisk.Format=y
- ResourceDisk.EnableSwap=y
- ResourceDisk.SwapSizeMB=4096
- Set the “ResourceDisk.SwapSizeMB” value to the number of megabytes to allocate to the swap file. Usually, this value can be up to the size of the installed system memory. Make sure you have sufficient available space on the disk to do this.
- Press <Ctrl>+<X>, <Y> and then <Enter> to exit the nano editor and save the “waagent.conf” file.
- Restart the Azure Linux Agent service:
- andy@thelounge:~$ sudo service waagent restart
- Verify that your swap file is available:
- andy@thelounge:~$ swapon -s
Code:
shutdown -r now

Code:
andy@thelounge:/mnt$ df -h
Filesystem Size Used Avail Use% Mounted on
udev 176M 0 176M 0% /dev
tmpfs 39M 936K 38M 3% /run
/dev/sdb1 29G 1.8G 28G 7% /
tmpfs 194M 0 194M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 194M 0 194M 0% /sys/fs/cgroup
/dev/loop0 55M 55M 0 100% /snap/core18/1754
/dev/loop1 38M 38M 0 100% /snap/thelounge/91
/dev/loop2 28M 28M 0 100% /snap/snapd/7264
/dev/sdb15 105M 3.6M 101M 4% /boot/efi
/dev/sda1 3.9G 3.9G 0 100% /mnt
tmpfs 39M 0 39M 0% /run/user/1000
andy@thelounge:/mnt$ ls -alh
total 3.9G
drwxr-xr-x 3 root root 4.0K May 24 09:04 .
drwxr-xr-x 23 root root 4.0K May 24 09:04 ..
-r--r--r-- 1 root root 639 May 23 19:02 DATALOSS_WARNING_README.txt
drwx------ 2 root root 16K May 23 19:02 lost+found
-rw------- 1 root root 3.9G May 24 09:07 swapfile
andy@thelounge:/mnt$ free -h
total used free shared buff/cache available
Mem: 386M 236M 29M 868K 120M 137M
Swap: 3.8G 10M 3.8G
andy@thelounge:/mnt$
- Ensure you don’t assign more space to the swap file than available on disk, otherwise, you can run into abnormal system behaviour, including not being able to log in to your instance.
- Also, be careful when resizing your VM, as the available disk space may decrease to the point of causing issues stated before.

I hope this tutorial been useful for you, feel free to post your questions or comments down below
