ruby-on-rails - Monit bundle exec rails s

Question

我有以下 shell 脚本，它允许我启动我的 Rails 应用程序，假设它名为 start-app.sh:

#!/bin/bash

cd /var/www/project/current
. /home/user/.rvm/environments/ruby-2.3.3
RAILS_SERVE_STATIC_FILES=true RAILS_ENV=production nohup bundle exec rails s -e production -p 4445 > /var/www/project/log/production.log 2>&1 &

上面的文件拥有以下权限:

-rwxr-xr-x  1 user user   410 Mar 21 10:00 start-app.sh*

如果我想检查我执行以下操作的过程:

ps aux | grep -v grep | grep ":4445"

它会给我以下输出:

user  2960  0.0  7.0 975160 144408 ?       Sl   10:37   0:07 puma 3.12.0 (tcp://0.0.0.0:4445) [20180809094218]

P.S: 我 grep ":4445"的原因是因为我在不同端口上运行的进程很少。 (针对不同的项目)

现在开始监控，我使用 apt-get 安装它，repo 的最新版本是 5.16，因为我在 Ubuntu 16.04 上运行，也请注意，monit 以 root 身份运行，这就是我在下面指定 gid uid 的原因。 (因为启动脚本用于从“用户”而不是“root”执行)

这里是monit的配置:

  set daemon 20            # check services at 20 seconds interval
  set logfile /var/log/monit.log
  set idfile /var/lib/monit/id
  set statefile /var/lib/monit/state


  set eventqueue
      basedir /var/lib/monit/events # set the base directory where events will be stored
      slots 100                     # optionally limit the queue size


  set mailserver xx.com port xxx
      username "xx@xx.com" password "xxxxxx"
      using tlsv12
      with timeout 20 seconds

  set alert xx@xx.com


  set mail-format {
       from: xx@xx.com
    subject: monit alert -- $EVENT $SERVICE
    message: $EVENT Service $SERVICE
                    Date:  $DATE
                  Action:  $ACTION
                    Host:  $HOST
             Description:  $DESCRIPTION
  }

 set limits {
        programOutput:     51200 B
        sendExpectBuffer:  25600 B
        fileContentBuffer: 51200 B
        networktimeout:    10 s
 }

  check system $HOST
    if loadavg (1min) > 4 then alert
    if loadavg (5min) > 2 then alert
    if cpu usage > 90% for 10 cycles then alert
    if memory usage > 85% then alert
    if swap usage > 35% then alert

check process nginx with pidfile /var/run/nginx.pid
        start program = "/bin/systemctl start nginx"
        stop program = "/bin/systemctl stop nginx"


check process redis
        matching "redis"
        start program = "/bin/systemctl start redis"
        stop program = "/bin/systemctl stop redis"

check process myapp
    matching ":4445"
    start program = "/bin/bash -c '/home/user/start-app.sh'" as uid "user" and gid "user"
    stop program = "/bin/bash -c /home/user/stop-app.sh" as uid "user" and gid "user"

   include /etc/monit/conf.d/*
   include /etc/monit/conf-enabled/*

现在 monit，正在检测并在进程停止时提醒我(如果我手动杀死它)以及当它被手动恢复时，但它不会自动启动该 shell 脚本..根据/var/log/monit .log，它显示以下内容:

[UTC Aug 13 10:16:41] info     : Starting Monit 5.16 daemon
[UTC Aug 13 10:16:41] info     : 'production-server' Monit 5.16 started
[UTC Aug 13 10:16:43] error    : 'myapp' process is not running
[UTC Aug 13 10:16:46] info     : 'myapp' trying to restart
[UTC Aug 13 10:16:46] info     : 'myapp' start: /bin/bash
[UTC Aug 13 10:17:17] error    : 'myapp' failed to start (exit status 0) -- no output

到目前为止，我在 monit 尝试执行脚本时看到的是它尝试加载它(我可以使用 ps aux | grep -v grep | grep ":4445"< 看到它不到 3 秒/strong>，但是这个输出与我上面的输出不同，它显示了正在执行的 shell 脚本的内容，特别是这个:

blablalba... nohup bundle exec rails s -e production -p 4445

然后它就消失了。然后它会尝试重新执行 shell.. 一次又一次...我错过了什么，我的配置有什么问题？请注意，我无法更改 start-app.sh 中的任何内容，因为它正在生产并 100% 正常工作。 (我只是想监视它)

编辑:根据我的理解和经验，这似乎是一个环境变量问题或路径问题，但我不确定如何解决它，将 env 变量放在 monit 中没有任何意义..如果其他人想要编辑该 shell 脚本或添加新内容怎么办？我希望你明白我的意思

Answer 1

如我所料，这是用户环境问题，我通过如下编辑 monit 配置解决了这个问题:

之前(不工作)

check process myapp
    matching ":4445"
    start program = "/bin/bash -c '/home/user/start-app.sh'" as uid "user" and gid "user"
    stop program = "/bin/bash -c /home/user/stop-app.sh" as uid "user" and gid "user"

---

(工作)之后

check process myapp
    matching ":4445"
    start program = "/bin/su -s /bin/bash -c '/home/user/start-app.sh' user"
    stop program = "/bin/su -s /bin/bash -c '/home/user/stop-app.sh' user"

说明:我从 monit 中删除了 (uid and gid) as "user" 因为它将仅以“user”的名义执行 shell 脚本但它赢了不获取/导入/使用用户的环境路径或环境变量。