如何优雅地关闭nginx

Question

我正在尝试使用 Heroku nginx buildpack，我的问题是 nginx 不会将 sigterm 处理为正常关闭，因此我正在尝试修改运行 nginx 的 bash 脚本来执行此操作。我也想了解更多关于 bash.

这是脚本：

#!/usr/bin/env bash

psmgr=/tmp/nginx-buildpack-wait
rm -f $psmgr
mkfifo $psmgr

# Evaluate config to get $PORT
erb config/nginx.conf.erb > config/nginx.conf

n=1
while getopts :f option ${@:1:2}
do
  case "${option}"
  in
    f) FORCE=$OPTIND; n=$((n+1));;
  esac
done

# Initialize log directory.
mkdir -p logs/nginx
touch logs/nginx/access.log logs/nginx/error.log
echo 'buildpack=nginx at=logs-initialized'

# Start log redirection.
(
  # Redirect nginx logs to stdout.
  tail -qF -n 0 logs/nginx/*.log
  echo 'logs' >$psmgr
) &

# Start App Server
(
  # Take the command passed to this bin and start it.
  # E.g. bin/start-nginx bundle exec unicorn -c config/unicorn.rb
  COMMAND=${@:$n}
  echo "buildpack=nginx at=start-app cmd=$COMMAND"
  $COMMAND
  echo 'app' >$psmgr
) &

if [[ -z "$FORCE" ]]
then
  FILE="/tmp/app-initialized"

  # We block on app-initialized so that when nginx binds to $PORT
  # are app is ready for traffic.
  while [[ ! -f "$FILE" ]]
  do
    echo 'buildpack=nginx at=app-initialization'
    sleep 1
  done
  echo 'buildpack=nginx at=app-initialized'
fi

# Start nginx
(
  # We expect nginx to run in foreground.
  # We also expect a socket to be at /tmp/nginx.socket.
  echo 'buildpack=nginx at=nginx-start'
  bin/nginx -p . -c config/nginx.conf
  echo 'nginx' >$psmgr
) &

# This read will block the process waiting on a msg to be put into the fifo.
# If any of the processes defined above should exit,
# a msg will be put into the fifo causing the read operation
# to un-block. The process putting the msg into the fifo
# will use it's process name as a msg so that we can print the offending
# process to stdout.
read exit_process <$psmgr
echo "buildpack=nginx at=exit process=$exit_process"
exit 1

目的是以节点服务器和 nginx 应该关闭的方式处理 SIGTERM 信号，使用这个脚本，一切都会被立即杀死。我的节点服务器正在正确处理信号。

感谢您的帮助。

编辑 1：我已经修补了 nginx 以使用 SIGTERM 代替 SIGQUIT。我知道我必须捕获 SIGTERM 所以它不会杀死脚本但是脚本永远不会退出并且它只会在 30 秒后被杀死，这是进程死亡的 Heroku 超时。

Answer 1

这是我的实现，https://github.com/nenadfilipovic/heroku-buildpack-nginx。它在生产中表现出色。

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