Add timestamp to name of created VM's instance in bash script

Question

I deploy some VM's instances in my cloud infrastructure with bash script:

#!/bin/bash
instance_name="vm"
# create instance
yc compute instance create \
  --name $instance_name \
  --hostname reddit-app \
  --memory=2 \
  ...

I need to add timestamp to instance's name in format vm-DD-MM_YYYY-H-M-S.
For debug I tried to set value instance_name=$(date +%d-%m-%Y_%H-%M-%S) but got the error:

ERROR: rpc error: code = InvalidArgument desc = Request validation error: Name: invalid resource name

Any help would be appreciated.

Answer 1

The Yandex Cloud documentation says:
"The name may contain lowercase Latin letters, numbers, and hyphens. The first character must be a letter. The last character can't be a hyphen. The maximum length of the name is 63 characters".

I changed my script following the recommendations and it works now:

#!/bin/bash
instance_name="vm-$(date +%d-%m-%Y-%H-%M-%S)"
# create instance
yc compute instance create \
  --name $instance_name \
  --hostname reddit-app \
  --memory=2 \
  ...