我有两个相同的 EC2 实例（第二个是第一个的副本），运行 Gentoo。第一个实例正在运行 monit，它监视单个进程和一些系统资源，并且运行良好。
在第二个实例中，monit 运行但立即退出。两个实例的配置类似，monit 的版本也类似。
monit.log显示：
[GMT Oct 3 08:36:41] info : monit daemon with PID 5 awakened
节目最后几句台词strace monit：
write(2, "monit daemon with PID 5 awakened"..., 33monit daemon with PID 5 awakened ) = 33
time(NULL) = 1349252827
open("/etc/localtime", O_RDONLY) = 4
fstat64(4, {st_mode=S_IFREG|0644, st_size=118, ...}) = 0
fstat64(4, {st_mode=S_IFREG|0644, st_size=118, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb773a000
read(4, "TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\0\0\0\1\0\0\0\0"..., 4096) = 118
_llseek(4, -6, [112], SEEK_CUR) = 0
read(4, "\nGMT0\n", 4096) = 6
close(4) = 0
munmap(0xb773a000, 4096) = 0
write(3, "[GMT Oct 3 08:27:07] info :"..., 33) = 33
write(3, "monit daemon with PID 5 awakened"..., 33) = 33
waitpid(-1, NULL, WNOHANG) = -1 ECHILD (No child processes)
close(3) = 0
exit_group(0) = ?
无核心转储（ulimit -c显示unlimited）
monit -v显示：
monit: Debug: Adding host allow 'localhost'
monit: Debug: Skipping redundant host 'localhost'
monit: Debug: Skipping redundant host 'localhost'
monit: Debug: Adding credentials for user 'xxxx'.
Runtime constants:
Control file = /etc/monitrc
Log file = /var/log/monit/monit.log
Pid file = /var/run/monit.pid
Id file = /var/run/monit.pid
Debug = True
Log = True
Use syslog = False
Is Daemon = True
Use process engine = True
Poll time = 30 seconds with start delay 0 seconds
Expect buffer = 256 bytes
Event queue = base directory /var/monit with 100 slots
Mail server(s) = xx.xxx.xx.xxx with timeout 30 seconds
Mail from = (not defined)
Mail subject = (not defined)
Mail message = (not defined)
Start monit httpd = True
httpd bind address = Any/All
httpd portnumber = 2812
httpd signature = True
Use ssl encryption = False
httpd auth. style = Basic Authentication and Host/Net allow list
Alert mail to = [email protected]
Alert on = All events
The service list contains the following entries:
System Name = xxxx
Monitoring mode = active
CPU wait limit = if greater than 20.0% 1 times within 1 cycle(s) then alert else if succeeded 1 times within 1 cycle(s) then alert
CPU system limit = if greater than 30.0% 1 times within 1 cycle(s) then alert else if succeeded 1 times within 1 cycle(s) then alert
CPU user limit = if greater than 70.0% 1 times within 1 cycle(s) then alert else if succeeded 1 times within 1 cycle(s) then alert
Swap usage limit = if greater than 25.0% 1 times within 1 cycle(s) then alert else if succeeded 1 times within 1 cycle(s) then alert
Memory usage limit = if greater than 75.0% 1 times within 1 cycle(s) then alert else if succeeded 1 times within 1 cycle(s) then alert
Load avg. (5min) = if greater than 2.0 1 times within 1 cycle(s) then alert else if succeeded 1 times within 1 cycle(s) then alert
Load avg. (1min) = if greater than 4.0 1 times within 1 cycle(s) then alert else if succeeded 1 times within 1 cycle(s) then alert
Process Name = xxxx
Group = server
Pid file = /var/run/xxxx.pid
Monitoring mode = active
Start program = '/etc/init.d/xxxx restart' timeout 20 second(s)
Stop program = '/etc/init.d/xxxx stop' timeout 30 second(s)
Existence = if does not exist 1 times within 1 cycle(s) then restart else if succeeded 1 times within 1 cycle(s) then alert
Pid = if changed 1 times within 1 cycle(s) then alert
Ppid = if changed 1 times within 1 cycle(s) then alert
Timeout = If restarted 3 times within 5 cycle(s) then unmonitor
Alert mail to = [email protected]
Alert on = All events
Alert mail to = [email protected]
Alert on = All events
-------------------------------------------------------------------------------
monit daemon with PID 5 awakened
emerge --sync之前运行过emerge -va monit，安装了 monit v5.3.2。当它不起作用时，我从他们的网站下载了 v5.5，并从源代码编译，但还是不起作用。
答案1
发现问题所在：
该文件包含一些奇怪的信息，由于某种原因，/var/run/monit.pid它看起来像哈希。md5
删除此文件并重新启动 monit 后，一切都正常了。引起我怀疑的是这一行monit daemon with PID 5 awakened非常奇怪，因为新运行的进程应该具有更高的 PID，所以我去检查了 .pid 文件。
答案2
我已经在 EBS 支持的 EC2 实例上加载了 Monit（使用 AWS 的标准 Linux 版本）。
由于我的配置错误，Monit 在启动/重新启动时对我来说不可靠。在配置文件 /etc/monit.conf 中，我有以下行，这是不正确的：
set idfile /var/run/monit.pid
那应该是
set idfile /var/run/.monit.id
将来某些人可能会发现这很有帮助。