Openstack / Create Subnet In Network
Create Subnet In Network
Creates a new subnet within an existing network in OpenStack.
openstack subnet create --network <network_id_or_name> --subnet-range 192.168.0.0/24 <subnet_name> openstack subnet create --network <network_id_or_name> --subnet-range 192.168.0.0/24 <subnet_name> #!/bin/bash
# Create Subnet In Network
openstack subnet create --network {{network_id_or_name}} --subnet-range 192.168.0.0/24 {{subnet_name}} import subprocess
# Create Subnet In Network
# Make sure to replace <placeholders> with actual values
def run_command():
cmd = [
"openstack",
"subnet",
"create",
"--network",
"<network_id_or_name>",
"--subnet-range",
"192.168.0.0/24",
"<subnet_name>"
]
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
When establishing a new subnet for an application environment requiring IP address allocation.
Pro Tip
Use the `--allocation-pool` flag to define a specific range of IPs to be allocated, ensuring client devices receive appropriate addresses during DHCP operations.
Command Builder
Tune the command before you copy it
openstack subnet create --network <network_id_or_name> --subnet-range 192.168.0.0/24 <subnet_name> Anatomy of Output
Understanding the result
+--------------+--------------------------------------+ Header: Subnet Creation Result Indicates the start of the output information.
| id | 12345678-1234-5678-1234-567812345678 | Subnet ID Unique identifier for the newly created subnet.
| name | subnet-abc | Subnet Name Human-readable name for the subnet.
| ip_version | 4 | IP Version Indicates the IP version in use.
| cidr | 192.168.0.0/24 | CIDR Notation Shows the subnet's address range via CIDR format.
| dns_nameservers | 8.8.8.8 | DNS Servers Lists configured DNS servers for the subnet.
Troubleshooting
Common pitfalls
ERROR: InvalidInput: Subnet range overlaps with existing subnets.
Solution: Ensure the specified range does not conflict with existing subnets within the network.
ERROR: NetworkNotFound: Network 'net-unknown' not found.
Solution: Verify the network ID or name is correct and exists in the OpenStack environment.
ERROR: InvalidCIDR: Invalid CIDR '192.168.0.0/24'.
Solution: Check the CIDR notation to ensure proper formatting and valid ranges.
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.
-
<network_id_or_name> - network id or name
- The value supplied for network id or name.
-
<subnet_name> - subnet name
- The value supplied for subnet name.
-
--network - Command Option
- Tool-specific option used by this command invocation.
-
--subnet-range - Command Option
- Tool-specific option used by this command invocation.
Alternative Approaches
Comparable commands in other tools
Alternative cloud infrastructure tools for the same job.
gcloud compute ssh <user>@<instance> Flyctl / View Status Of Specific Application flyctl status --app <app_name> Aws / Delete Eks Cluster 1608 aws eks delete-cluster --name <cluster_name> Gh / Create Codespace Github Interactively gh cs create Cradle / Submit Elasticsearch Schema cradle elastic map