我有以下shell脚本,可让我启动我的Rails应用,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:我之所以使用grep“:4445”是因为我在不同端口上运行的进程很少。 (针对不同的项目)
现在要监视它,我使用apt-get进行安装,回购的最新版本是 5.16 ,因为我也在 Ubuntu 16.04 上运行请注意,monit以root身份运行,这就是为什么我在下面指定gid uid的原因。 (因为开始脚本通常是从“用户”而非“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停止(如果我手动将其杀死)以及何时手动恢复,但它不会自动启动该Shell脚本..并根据/ 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该脚本(使用 ps aux | grep -v grep | grep“:4445”,我可以看到它少于3秒/ strong>,但此输出与我显示的上述输出不同,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
,然后消失。然后它尝试重新执行外壳..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,因为它已经投入生产并且可以100%工作。 (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
答案 0 :(得分:2)
正如我所期望的,这是用户环境问题,我通过编辑以下监视配置来解决它:
之前(无效)
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和gid)作为“用户” ,因为它将仅以“用户”的名义执行shell脚本,但它赢了不要获取/导入/使用用户的环境路径或环境变量。