Capistrano部署：从独角兽开始

Question

Deploying with capistrano. Everything goes fine, and then while deploy:start (during deploy:cold), it produces an error:

  * ←[32m2013-03-14 15:03:05 executing `deploy:start'←[0m
  * ←[33mexecuting "/etc/init.d/unicorn_appname start"←[0m
    servers: ["XXX.XXX.131.4"]
    [XXX.XXX.131.4] executing command
 ** [out :: XXX.XXX.131.4] sh: /etc/init.d/unicorn_appname: not found
    ←[2;37mcommand finished in 1572ms←[0m
failed: "sh -c '/etc/init.d/unicorn_appname start'" on XXX.XXX.131.4

The file in question exists. Here's it's contents:

#!/bin/sh
### BEGIN INIT INFO
# Provides:          unicorn
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Manage unicorn server
# Description:       Start, stop, restart unicorn server for a specific application.
### END INIT INFO
set -e

# Feel free to change any of the following variables for your app:
TIMEOUT=${TIMEOUT-60}
APP_ROOT=/root/apps/appname/current
PID=$APP_ROOT/tmp/pids/unicorn.pid
CMD="cd $APP_ROOT; bundle exec unicorn -D -c $APP_ROOT/config/unicorn.rb -E production"
AS_USER=root
set -u

OLD_PIN="$PID.oldbin"

sig () {
  test -s "$PID" && kill -$1 `cat $PID`
}

oldsig () {
  test -s $OLD_PIN && kill -$1 `cat $OLD_PIN`
}

run () {
  if [ "$(id -un)" = "$AS_USER" ]; then
    eval $1
  else
    su -c "$1" - $AS_USER
  fi
}

case "$1" in
start)
  sig 0 && echo >&2 "Already running" && exit 0
  run "$CMD"
  ;;
stop)
  sig QUIT && exit 0
  echo >&2 "Not running"
  ;;
force-stop)
  sig TERM && exit 0
  echo >&2 "Not running"
  ;;
restart|reload)
  sig HUP && echo reloaded OK && exit 0
  echo >&2 "Couldn't reload, starting '$CMD' instead"
  run "$CMD"
  ;;
upgrade)
  if sig USR2 && sleep 2 && sig 0 && oldsig QUIT
  then
    n=$TIMEOUT
    while test -s $OLD_PIN && test $n -ge 0
    do
      printf '.' && sleep 1 && n=$(( $n - 1 ))
    done
    echo

    if test $n -lt 0 && test -s $OLD_PIN
    then
      echo >&2 "$OLD_PIN still exists after $TIMEOUT seconds"
      exit 1
    fi
    exit 0
  fi
  echo >&2 "Couldn't upgrade, starting '$CMD' instead"
  run "$CMD"
  ;;
reopen-logs)
  sig USR1
  ;;
*)
  echo >&2 "Usage: $0 <start|stop|restart|upgrade|force-stop|reopen-logs>"
  exit 1
  ;;
esac

Having tried to run the command through ssh (sh -c '/etc/init.d/unicorn_appname start'), I've encountered the same error.

What can be the reason?

Answer 1

This most probably occurs if you have symlinked from the relative path vs absolute path. Try to symlink again by providing the absolute path.

chmod +x /home/username/app/app_name/current/config/unicorn_init.sh

ln -nfs /home/username/app/app_name/current/config/unicorn_init.sh /etc/init.d/unicorn_app_name

And see if this works

Answer 2

Thank you all for the suggestions. The problem is finally solved. The issue turned out to be with deployment from a windows machine - .sh file had Windows-styled line endings and could not be correctly read by unix. The solution was in changing IDE settings accordingly (for Rubymine: File->Settings->Code style->General->Line separator->unix) and recreating the file. Then: git add . git commit -m "fix" git push cap deploy:setup cap deploy:cold

Done! Thanks again eveybody!

PS: does anybody know why can asset pipeline not work after deployment?

Answer 3

Your capistrano deploy:start task should read

task :start, :roles => :app, :except => { :no_release => true } do
  run "/etc/init.d/unicorn start"
end

Unless you deliberately named your unicorn init file /etc/init.d/unicorn_appname.

Does the capistrano deploy user have execute permission on that file?