Openstack / List Servers
List Servers
List all servers in OpenStack.
openstack server list openstack server list #!/bin/bash
# List Servers
openstack server list import subprocess
# List Servers
# Make sure to replace <placeholders> with actual values
def run_command():
cmd = [
"openstack",
"server",
"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 an operational review to gauge resource utilization and status across compute resources.
Pro Tip
Use `--status` to filter by specific instance states (ACTIVE, SHUTOFF).
Anatomy of Output
Understanding the result
+--------------------------------------+---------+-------------------------------------+----------+ Output Header Details server IDs, names, and statuses.
| ID | Name | Status | Networks | Column Details Shows relevant attributes for all servers.
| 4567890a-abcd-ef00-4444-556677889900 | test-server | ACTIVE | private=192.168.1.5 | Server Entry An example server entry showcasing its status and network.
Power User Variants
Optimized versions
openstack server list --status ACTIVE List only active servers.
openstack server list --format json Get server list in JSON format for processing.
Troubleshooting
Common pitfalls
Unauthorized (HTTP 401)
Solution: Verify user credentials and ensure sufficient roles.
No suitable hosts found (HTTP 503)
Solution: Check compute host availability and resource allocation.
Server not found (HTTP 404)
Solution: Confirm server ID or name for accuracy.
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.
dnsmasq --version Curl / Send Form Encoded Data curl -X POST -d '<name=bob>' {http://example.com/form} Openvpn / Connect To Host With Same Static Key sudo openvpn --remote <bob.example.com> --dev <tun1> --ifconfig <10.4.0.2> <10.4.0.1> --secret <path/to/key> Ifconfig / Convert Command Output To Json Via Pipe <ifconfig> | jc <--ifconfig> Jc / Convert Command Output To Json Via Magic Syntax jc <ifconfig>