Capistrano和EC2：sh：1：杀死失败

Question

I am trying to deploy new code to Amazon EC2 instance with using capistrano and suddenly, I got this error:

servers: ["IP"]
[IP] executing command
*** [err :: IP] cat:
*** [err :: IP] /home/deployer/fileto/current/tmp/pids/unicorn.pid
*** [err :: IP] : No such file or directory
*** [err :: IP]
*** [err :: IP] sh: 1: kill:
*** [err :: IP] Usage: kill [-s sigspec | -signum | -sigspec] [pid | job]... or
*** [err :: IP] kill -l [exitstatus]
*** [err :: IP]
    command finished in 371ms
failed: "sh -c 'kill -s USR2 `cat /home/deployer/project_name/current/tmp/pids/unicorn.pid`'" on IP

Two hours ago I deployed code successfully, but now I when I try it, I get this error message.

What happened with the instance and the whole deployment process if 2 hours ago was everything working well?

EDIT: When I run

kill -s USR2 cat /home/deployer/fileto/current/tmp/pids/unicorn.pid

I get

cat: /home/deployer/fileto/current/tmp/pids/unicorn.pid: No such file or directory
kill: usage: kill [-s sigspec | -n signum | -sigspec] pid | jobspec ... or kill -l [sigspec]

Answer 1

Is this an error condition that needs to stop deployment? You can add || true to the end of the kill command, add :on_error => continue to the task, or prefix with [ -d /home/deployer/fileto/current/tmp/pids/unicorn.pid ] before the kill command.