Openstack / List All Subnets
List All Subnets
Lists all subnets available in the OpenStack environment.
openstack subnet list openstack subnet list #!/bin/bash
# List All Subnets
openstack subnet list import subprocess
# List All Subnets
# Make sure to replace <placeholders> with actual values
def run_command():
cmd = [
"openstack",
"subnet",
"list"
]
try:
print(f"Executing: {' '.join(cmd)}")
subprocess.run(cmd, check=True)
except subprocess.CalledProcessError as e:
print(f"Error: {e}")
except FileNotFoundError:
print("Error: openstack not found. Please install it first.")
if __name__ == "__main__":
run_command() When To Use
During initial network setup or troubleshooting to assess subnet configurations.
Pro Tip
Use `--format json` for machine-readable output to automate parsing.
Anatomy of Output
Understanding the result
+--------------------------------------+---------------------------------+-------------------+--------+ Table Header Defines the boundaries of the subnet listing.
| Subnet ID | Name | CIDR | Status | Column Names Indicates the fields returned for each subnet.
| 1234abcd-5678-90ef-ghij-klmnopqrst | MySubnet | 10.0.0.0/24 | ACTIVE | Subnet Entry Displays an example of a listed subnet and its details.
Troubleshooting
Common pitfalls
Error: No subnets found.
Solution: Ensure subnets are created in the OpenStack project.
Error: Permission denied for listing subnets.
Solution: Check role permissions for the currently authenticated user.
Error: Unable to contact the network service.
Solution: Ensure the OpenStack network service is operational.
Command Breakdown
What each part is doing
-
openstack - Base Command
- The executable that performs this operation. Here it runs Openstack before the shell applies any redirect operators.
Alternative Approaches
Comparable commands in other tools
Alternative networking tools for the same job.