Question 1

How do I use hss with SSH keys for authentication?

Accepted Answer

Specify SSH keys using the -c option for common arguments, like -c '-i ~/.ssh/id_rsa', or include them directly in the hostfile with per-host SSH options. hss passes all arguments through to the underlying ssh command.

Question 2

Can hss handle file transfers between servers?

Accepted Answer

No, hss is designed only for parallel command execution and doesn't support file transfer features like scp or rsync. You'll need to use separate tools for moving files across servers.

Question 3

What's the difference between hss and parallel-ssh (pssh)?

Accepted Answer

hss offers an interactive, bash-like environment with readline features and per-host color coding, while pssh is more batch-oriented and script-friendly with output collection but less interactive. hss is better for live management, pssh for automation scripts.

Question 4

How to limit concurrent connections to avoid overloading servers?

Accepted Answer

Use the -l limit option to specify the number of multiple SSH connections to perform at a time. For example, -l 10 limits execution to 10 servers concurrently, preventing network or server strain.

Question 5

Does hss support executing commands only on specific servers based on conditions?

Accepted Answer

No, hss executes commands on all specified servers in parallel without conditional logic. For selective execution, you need to pre-filter the hostfile or use external tools to manage server groups.

Question 6

How to save hss output to a file for later analysis?

Accepted Answer

Use the -o file option to write all remote command output to a specified file. This captures combined results, but per-server output isn't separated unless you customize the command or post-process.

Question 7

Is hss suitable for automating deployments across cloud instances?

Accepted Answer

Yes, for simple parallel command runs like updating packages or restarting services, but for complex deployments with dependencies and rollbacks, tools like Ansible or Terraform are better due to their state management and error handling.

hss

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