怎样监控一个daemon服务？

920696629

回帖挺你一下。。

phanx

回复 19# yyu0378

来看看下面这段测试脚本b.sh。

1. [root@localhost ~]# cat b.sh
   
2. #!/bin/bash
   
3. service exchange-bmc-os-info status 2>&1 | grep --color inactive
   
4. if [ $? -eq 0 ]; then
   
5.   echo "service is failed"
   
6. else
   
7.   echo "service is active"
   
8. fi
   
9. 
   
10. 
    
11. 执行service exchange-bmc-os-info status会输出服务的状态，为inactive或者ok
    
12. [root@localhost ~]# service exchange-bmc-os-info status
    
13. exchange-bmc-os-info: inactive
    
14. 
    
15. 
    
16. 
    
17. 当服务停止时，b.sh的输出是 service is failed
    
18. [root@localhost ~]# ./b.sh
    
19. exchange-bmc-os-info: inactive
    
20. service is failed
    
21. 
    
22. 
    
23. 启动服务后，可以看到状态是ok了。
    
24. [root@localhost ~]# service exchange-bmc-os-info start
    
25. Synchronizing BMC information...
    
26. [确定]
    
27. [root@localhost ~]# service exchange-bmc-os-info status
    
28. exchange-bmc-os-info: ok
    
29. 
    
30. 
    
31. 这个时候，b.sh的输出是 service is active。
    
32. grep inactive 没有输出，且$? 的值是-1 所以，if判断后输出是  service is active
    
33. [root@localhost ~]# ./b.sh
    
34. service is active
    

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phanx

回复 20# ssfjhh


    因为我没有你的环境，所以不好判断为啥会有问题。

你可以试试修改一下脚本

1. #!/bin/sh
   
2. 
   
3. while true
   
4. 
   
5. do
   
6. 
   
7. sudo service transmission-daemon status 2>&1 |grep failed
   
8. 
   
9. if [ $? -eq 0 ]; then
   
10.   sudo service transmission-daemon restart
    
11.   sudo service transmission-daemon status 2>&1
    
12.   sleep 10
    
13.   sudo service transmission-daemon status 2>&1 |grep failed
    
14. fi
    
15. 
    
16. sleep 5
    
17. 
    
18. done
    

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然后你执行这个脚本的时候不放到后台。也就是说不要用 nohup ./checkpt.sh & 来执行了，改成直接前台执行 ./checkpt.sh

然后手工kill掉你的transmission-daemon，同时观察一下checkpt.sh的输出，然后贴上来。

ssfjhh

回复 23# phanx


    谢谢，前端时间比较忙，没折腾这个东西。刚试了下，用你给的脚本是可以启动trnansmission-daemon的，不管它是自己挂掉的，还是被我kill掉的，这个脚本都能让transmission-daemon重新启动。但是transmission-daemon十来秒就重启一次，这也不是我想要的结果。

该脚本的输出如下所示：

1. osmc@osmc:~$ ./checkpt.sh
   
2. ● transmission-daemon.service - Transmission BitTorrent Daemon
   
3.    Loaded: loaded (/lib/systemd/system/transmission-daemon.service; enabled)
   
4.    Active: active (running) since 三 2015-05-13 09:53:45 CST; 68ms ago
   
5. Main PID: 29590 (transmission-da)
   
6.    CGroup: /system.slice/transmission-daemon.service
   
7.            └─29590 /usr/bin/transmission-daemon -f --log-error
   
8. ● transmission-daemon.service - Transmission BitTorrent Daemon
   
9.    Loaded: loaded (/lib/systemd/system/transmission-daemon.service; enabled)
   
10.    Active: active (running) since 三 2015-05-13 09:54:06 CST; 69ms ago
    
11. Main PID: 29664 (transmission-da)
    
12.    CGroup: /system.slice/transmission-daemon.service
    
13.            └─29664 /usr/bin/transmission-daemon -f --log-error
    
14. ● transmission-daemon.service - Transmission BitTorrent Daemon
    
15.    Loaded: loaded (/lib/systemd/system/transmission-daemon.service; enabled)
    
16.    Active: active (running) since 三 2015-05-13 09:54:27 CST; 70ms ago
    
17. Main PID: 29737 (transmission-da)
    
18.    CGroup: /system.slice/transmission-daemon.service
    
19.            └─29737 /usr/bin/transmission-daemon -f --log-error
    
20. ● transmission-daemon.service - Transmission BitTorrent Daemon
    
21.    Loaded: loaded (/lib/systemd/system/transmission-daemon.service; enabled)
    
22.    Active: active (running) since 三 2015-05-13 09:54:48 CST; 67ms ago
    
23. Main PID: 29813 (transmission-da)
    
24.    CGroup: /system.slice/transmission-daemon.service
    
25.            └─29813 /usr/bin/transmission-daemon -f --log-error
    
26. ● transmission-daemon.service - Transmission BitTorrent Daemon
    
27.    Loaded: loaded (/lib/systemd/system/transmission-daemon.service; enabled)
    
28.    Active: active (running) since 三 2015-05-13 09:55:09 CST; 65ms ago
    
29. Main PID: 29889 (transmission-da)
    
30.    CGroup: /system.slice/transmission-daemon.service
    
31.            └─29889 /usr/bin/transmission-daemon -f --log-error
    
32. ● transmission-daemon.service - Transmission BitTorrent Daemon
    
33.    Loaded: loaded (/lib/systemd/system/transmission-daemon.service; enabled)
    
34.    Active: active (running) since 三 2015-05-13 09:55:30 CST; 64ms ago
    
35. Main PID: 29965 (transmission-da)
    
36.    CGroup: /system.slice/transmission-daemon.service
    
37.            └─29965 /usr/bin/transmission-daemon -f --log-error
    
38. ● transmission-daemon.service - Transmission BitTorrent Daemon
    
39.    Loaded: loaded (/lib/systemd/system/transmission-daemon.service; enabled)
    
40.    Active: active (running) since 三 2015-05-13 09:55:51 CST; 65ms ago
    
41. Main PID: 30041 (transmission-da)
    
42.    CGroup: /system.slice/transmission-daemon.service
    
43.            └─30041 /usr/bin/transmission-daemon -f --log-error
    
44. ● transmission-daemon.service - Transmission BitTorrent Daemon
    
45.    Loaded: loaded (/lib/systemd/system/transmission-daemon.service; enabled)
    
46.    Active: active (running) since 三 2015-05-13 09:56:12 CST; 67ms ago
    
47. Main PID: 30113 (transmission-da)
    
48.    CGroup: /system.slice/transmission-daemon.service
    
49.            └─30113 /usr/bin/transmission-daemon -f --log-error
    
50. ● transmission-daemon.service - Transmission BitTorrent Daemon
    
51.    Loaded: loaded (/lib/systemd/system/transmission-daemon.service; enabled)
    
52.    Active: active (running) since 三 2015-05-13 09:56:33 CST; 73ms ago
    
53. Main PID: 30184 (transmission-da)
    
54.    CGroup: /system.slice/transmission-daemon.service
    
55.            └─30184 /usr/bin/transmission-daemon -f --log-error
    
56. ● transmission-daemon.service - Transmission BitTorrent Daemon
    
57.    Loaded: loaded (/lib/systemd/system/transmission-daemon.service; enabled)
    
58.    Active: active (running) since 三 2015-05-13 09:56:54 CST; 67ms ago
    
59. Main PID: 30258 (transmission-da)
    
60.    CGroup: /system.slice/transmission-daemon.service
    
61.            └─30258 /usr/bin/transmission-daemon -f --log-error
    

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ssfjhh

回复 24# ssfjhh


再上一个带高亮显示的图片吧。
   

yyu0378

每十秒重启就是判断条件有问题，试试看我的条件吧

ssfjhh

yyu0378 发表于 2015-05-13 11:31
每十秒重启就是判断条件有问题，试试看我的条件吧

1. ./checkpt.sh: 7: ./checkpt.sh: num: not found
   
2. ./checkpt.sh: 9: [: -eq: unexpected operator
   

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ssfjhh

yyu0378 发表于 2015-05-13 11:31
每十秒重启就是判断条件有问题，试试看我的条件吧

phanx

回复 24# ssfjhh


   有点奇怪，只有再改改，看看。

1. #!/bin/bash
   
2. 
   
3. while true
   
4. do
   
5.         sudo service transmission-daemon status 2>&1 |grep failed
   
6.         fail=$?
   
7.         echo $fail
   
8.         if [ $fail -eq 0 ]; then
   
9.           echo "Service Failed, Restart"
   
10.           sudo service transmission-daemon restart
    
11.           sleep 5
    
12.           sudo service transmission-daemon status 2>&1
    
13.           sudo service transmission-daemon status 2>&1 |grep failed
    
14.           fail=$?
    
15.           echo $fail
    
16.         else
    
17.           echo "Service Active"
    
18.         fi
    
19.         sleep 5
    
20. done

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ssfjhh

回复 29# phanx


    这下不会不停的重启了，但是我试着动手kill掉transmission-daemon的进程后，似乎它无法再次启动起来。

手动kill掉进程以后，sudo service transmission-daemon status的返回结果是这样的

1. osmc@osmc:~$ sudo service transmission-daemon status
   
2. ● transmission-daemon.service - Transmission BitTorrent Daemon
   
3.    Loaded: loaded (/lib/systemd/system/transmission-daemon.service; enabled)
   
4.    Active: inactive (dead) since 四 2015-05-14 08:47:23 CST; 2min 45s ago
   
5.   Process: 6091 ExecReload=/bin/kill -s HUP $MAINPID (code=exited, status=0/SUCCESS)
   
6.   Process: 12302 ExecStart=/usr/bin/transmission-daemon -f --log-error (code=exited, status=0/SUCCESS)
   
7. Main PID: 12302 (code=exited, status=0/SUCCESS)

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不能再次启动的原因似乎是这样的，status返回的状态不是failed，而是inactive（dead）。