Linux server reboot Post: 302586709

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Operating Systems Linux Linux server reboot Post 302586709 by chakrapani on Tuesday 3rd of January 2012 05:04:06 AM

01-03-2012

Registered User

Quote:

Originally Posted by linuxadmin

mark,

The application runs is not a small one. it's a big application. And the server becomes very very slow as it used from morning to evening..

Thus in some servers tomcat / postgre or the Entire system itself reboots.

Sounds like you might have problem with Big app. here are the ways to check problems.
Code checks:
1. Check if app open lots of temp files or creates cache which is required to be cleared.
2. If it is a web based app. check if connection to DB is closed after usage. If database is slow or causing slowness to a page.
3. if you have any file called via n/w may be network is slow connecting the server at certain time as n/w might be busy.
4. Check if static pages also load slow if web based app.
5. Check your app logs for more errors
6. Check if you have any fork bomb etc

H/W and S/W check
Install something like MRTG or cacti etc to monitor:
1. Check if your DB is slowing down after certain queries
2. Check if your app server tomcat / weblogic is properly configured.
3. Check if /tmp and /var /usr/local/apachec etc etc where log files are written is having enough space.
4. Check lsof to see files open.

I usually try to blame this way Smilie

1. Hardware (check bad mem or disk or any n/w) etc
2. Developers.
3. DBA bad indexing/configurations
4. kiddy perl/shell scripts which cause problems.
5. unnecessary services.

if nothing else the SYS Admin, Data center...

last but not least .... my FATE Smilie

chakrapani

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LEARN ABOUT CENTOS

grub-file

GRUB-FILE(1)                                                       User Commands                                                      GRUB-FILE(1)

NAME

       grub-file - check file type

SYNOPSIS

       file OPTIONS FILE

DESCRIPTION

       Check if FILE is of specified type.

       --is-i386-xen-pae-domu
              Check if FILE can be booted as i386 PAE Xen unprivileged guest kernel

       --is-x86_64-xen-domu
              Check if FILE can be booted as x86_64 Xen unprivileged guest kernel

       --is-x86-xen-dom0
              Check if FILE can be used as Xen x86 privileged guest kernel

       --is-x86-multiboot
              Check if FILE can be used as x86 multiboot kernel

       --is-x86-multiboot2 Check if FILE can be used as x86 multiboot2 kernel

       --is-arm-linux
              Check if FILE is ARM Linux

       --is-arm64-linux
              Check if FILE is ARM64 Linux

       --is-ia64-linux
              Check if FILE is IA64 Linux

       --is-mips-linux
              Check if FILE is MIPS Linux

       --is-mipsel-linux
              Check if FILE is MIPSEL Linux

       --is-sparc64-linux
              Check if FILE is SPARC64 Linux

       --is-powerpc-linux
              Check if FILE is POWERPC Linux

       --is-x86-linux
              Check if FILE is x86 Linux

       --is-x86-linux32
              Check if FILE is x86 Linux supporting 32-bit protocol

       --is-x86-kfreebsd
              Check if FILE is x86 kFreeBSD

       --is-i386-kfreebsd
              Check if FILE is i386 kFreeBSD

       --is-x86_64-kfreebsd
              Check if FILE is x86_64 kFreeBSD

       --is-x86-knetbsd
              Check if FILE is x86 kNetBSD

       --is-i386-knetbsd
              Check if FILE is i386 kNetBSD

       --is-x86_64-knetbsd Check if FILE is x86_64 kNetBSD

       --is-i386-efi
              Check if FILE is i386 EFI file

       --is-x86_64-efi
              Check if FILE is x86_64 EFI file

       --is-ia64-efi
              Check if FILE is IA64 EFI file

       --is-arm64-efi
              Check if FILE is ARM64 EFI file

       --is-arm-efi
              Check if FILE is ARM EFI file

       --is-hibernated-hiberfil
              Check if FILE is hiberfil.sys in hibernated state

       --is-x86_64-xnu
              Check if FILE is x86_64 XNU (Mac OS X kernel)

       --is-i386-xnu
              Check if FILE is i386 XNU (Mac OS X kernel)

       --is-xnu-hibr
              Check if FILE is XNU (Mac OS X kernel) hibernated image

       --is-x86-bios-bootsector
              Check if FILE is BIOS bootsector

       -h, --help              Display this help and exit.  -u, --usage             Display the usage of this command and exit.

SEE ALSO

       The  full documentation for grub-file is maintained as a Texinfo manual.  If the info and grub-file programs are properly installed at your
       site, the command

              info grub-file

       should give you access to the complete manual.

grub-file (GRUB) 2.02-2ubuntu8.3                                     July 2018                                                        GRUB-FILE(1)