Question 1

How to run commands on multiple servers at once with vSSH?

Accepted Answer

Use the Run method with a context and timeout after adding clients via AddClient. The respChan allows iterating over responses from all connected machines, as shown in the basic example for concurrent execution.

Question 2

vSSH vs Ansible for SSH automation: which should I use?

Accepted Answer

vSSH is better for custom Go-based automation at extreme scale with fine-grained control, while Ansible suits broader configuration management with built-in modules and YAML playbooks. Choose vSSH for performance-critical, programmatic tasks in Go environments.

Question 3

How to set up label-based queries in vSSH?

Accepted Answer

Assign labels to clients with SetLabels during AddClient, then use RunWithLabel with a DSL string like '(POP == LAX) && OS == JUNOS' to target specific subsets, as demonstrated in the sample query.

Question 4

Does vSSH support SSH key authentication?

Accepted Answer

Yes, vSSH supports key-based authentication through GetConfigPEM for PEM files, and other methods like GetConfigUserPass for password auth, providing flexibility for different security setups.

Question 5

How to stream output in real-time with vSSH?

Accepted Answer

Call GetStream on a response and use ScanStdout in a loop to read output incrementally, enabling live monitoring without waiting for command completion, as illustrated in the stream example.

Question 6

What happens if a SSH connection fails in vSSH?

Accepted Answer

Errors are captured in resp.Err(), allowing graceful handling in loops; the library continues processing other connections, ensuring robustness in large-scale operations where individual failures are common.

vssh

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