The runner container already launches ssh-agent and loads the correct private key, but the build step runs inside a non-interactive script that does not inherit the agent's environment. Which single environment variable must the script export so that ssh, scp, and git can locate and communicate with the running ssh-agent?
OpenSSH clients discover an existing ssh-agent through the Unix-domain socket named in the SSH_AUTH_SOCK environment variable. If that variable is missing or points to a stale path, the client cannot reach the agent and falls back to other authentication methods, producing the "sign_and_send_pubkey" failure. SSH_AGENT_PID only records the agent's process ID for cleanup, SSH_ASKPASS is used to prompt for passphrases, and SSH_CONNECTION simply contains connection metadata. None of those variables tell the client where the agent socket resides, so exporting SSH_AUTH_SOCK is essential.
Ask Bash
Bash is our AI bot, trained to help you pass your exam. AI Generated Content may display inaccurate information, always double-check anything important.
What is SSH_AUTH_SOCK, and why is it needed?
Open an interactive chat with Bash
What role does an ssh-agent play in authentication?
Open an interactive chat with Bash
How does SSH_AGENT_PID differ from SSH_AUTH_SOCK?
Open an interactive chat with Bash
CompTIA Linux+ XK0-006 (V8)
Security
Your Score:
Report Issue
Bash, the Crucial Exams Chat Bot
AI Bot
Loading...
Loading...
Loading...
IT & Cybersecurity Package Join Premium for Full Access