小编典典

Monit Bundle执行器Ra​​ils

linux

我有以下shell脚本,可让我启动我的rails应用程序,假设它称为 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 &

上面的文件具有以下权限:

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

如果我想检查过程,请执行以下操作:

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]

PS: 我使用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)

现在进入monit,我使用apt-get进行安装,而repo的最新版本是 5.16 ,因为我在 Ubuntu 16.04
上运行,还请注意monit以root身份运行,这就是为什么我在以下。(因为启动脚本以前是从“用户”而不是“根”执行的)

这是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正在检测并警告我该进程何时关闭(如果我手动将其杀死)以及何时进行手动恢复,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,当monit尝试执行脚本时,我看到的是它尝试加载它(我可以使用 ps aux | grep -v grep | grep“:4445”
不到3秒看到它,但是此输出与以上显示了我的输出,它显示了正在执行的Shell脚本的内容,特别是以下内容:

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

然后它消失了。然后它会尝试重新执行外壳程序。.一次又一次…我缺少什么,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,因为它已投入生产并且可以100%运行。(我只想监视它)

编辑:根据我的理解和经验,这似乎是环境变量问题或路径问题,但是我不确定如何解决它,将env变量放在monit中没有任何意义..如果有人其他人想要编辑该shell脚本或添加新的东西吗?我希望你明白我的意思


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2020-06-07

共1个答案

小编典典

如我所料,这是用户环境问题,我通过编辑监视配置来解决此问题,如下所示:

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"

之后(工作)

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和gid)作为“用户” ,因为它 只会 以“用户”的名义执行shell脚本,但不会获取/导入/使用
用户的环境 路径或环境变量。

2020-06-07