Eu tenho duas instâncias idênticas do EC2 (a segunda é uma réplica da primeira), executando o Gentoo. A primeira instância tem monit running, que monitora um único processo e alguns recursos e funções do sistema.
Na segunda instância, monit é executado, mas sai imediatamente. A configuração é semelhante em ambas as instâncias, assim como as versões de monit.
monit.log mostra:
[GMT Oct 3 08:36:41] info : monit daemon with PID 5 awakened
Linhas finais em strace monit show:
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, "TZif2monit: 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
[GMT Oct 3 08:36:41] info : monit daemon with PID 5 awakened
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, "TZif2monit: 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
%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%"..., 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) = ?
%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%%pre%"..., 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) = ?
Nenhum dump principal ( ulimit -c mostra unlimited )
monit -v mostra:
Executou emerge --sync antes de emerge -va monit que instalou o monit v5.3.2.
Quando isso não funcionou eu baixei v5.5 de seu site e compilado da fonte que não funcionava também.
Descobriu qual era o problema:
O arquivo /var/run/monit.pid continha algumas informações estranhas, parecia um md5 hash por algum motivo.
Uma vez que eu removi este arquivo e reiniciei o monitor, tudo funcionou bem.
O que alertou minha suspeita foi a linha monit daemon with PID 5 awakened que era muito estranha porque um processo recém-executado deveria ter um PID muito mais alto, então eu fui checar o arquivo .pid.
Eu carreguei o Monit em uma instância EC2 apoiada pelo EBS (usando a compilação Linux padrão da AWS).
Monit não foi confiável para mim ao iniciar / reiniciar devido a um erro de configuração da minha parte. No arquivo de configuração /etc/monit.conf eu tinha a seguinte linha, que estava incorreta:
set idfile /var/run/monit.pid
Isso deveria ter sido
set idfile /var/run/.monit.id
Alguém aí pode achar isso útil no futuro.
Tags amazon-ec2 gentoo monit