[CentOS] How to determine why a server is not responding

nan del bosc

nandelbosc at gmail.com
Thu Apr 11 15:36:19 UTC 2013


Hi to all!

We're using CentOS 5.5 64bits for our Plesk 11.

This week we had the following problem 3 times...

Suddenly, the server stops responding in all services (SSH, Apache,
Postfix, ...) but ping works!

After wait a few minutes (or 2 hours some times) the server continues
unresponsive until we reboot. After reboot we search on /var/log/messages
but cannot find useful information...

Apr 11 14:56:05 s1 postfix/smtpd[8263]: SQL engine 'intentionally disabled'
not supported
Apr 11 14:56:05 s1 postfix/smtpd[8263]: auxpropfunc error no mechanism
available
Apr 11 14:56:42 s1 postfix/smtpd[8370]: SQL engine 'intentionally disabled'
not supported
Apr 11 14:56:42 s1 postfix/smtpd[8370]: auxpropfunc error no mechanism
available
Apr 11 14:56:47 s1 postfix/smtpd[8391]: SQL engine 'intentionally disabled'
not supported
Apr 11 14:56:47 s1 postfix/smtpd[8391]: auxpropfunc error no mechanism
available
Apr 11 14:56:47 s1 postfix/smtpd[8392]: SQL engine 'intentionally disabled'
not supported
Apr 11 14:56:47 s1 postfix/smtpd[8392]: auxpropfunc error no mechanism
available
Apr 11 16:55:42 s1 syslogd 1.4.1: restart.
Apr 11 16:55:42 s1 kernel: klogd 1.4.1, log source = /proc/kmsg started.
Apr 11 16:55:42 s1 kernel: Bootdata ok (command line is ro root=/dev/xvda1
console=xvc0 console=hvc0 xencons=hvc)
Apr 11 16:55:42 s1 kernel: Linux version 2.6.18-194.26.1.el5xen (
mockbuild at builder10.centos.org) (gcc version 4.1.2 20080704 (Red Hat
4.1.2-48)) #1 SMP Tue Nov 9 13:35:30 EST 2010
Apr 11 16:55:42 s1 kernel: BIOS-provided physical RAM map:
Apr 11 16:55:42 s1 kernel:  Xen: 0000000000000000 - 0000000080000000
(usable)
Apr 11 16:55:42 s1 kernel: No mptable found.
Apr 11 16:55:42 s1 kernel: Built 1 zonelists.  Total pages: 524288
Apr 11 16:55:42 s1 kernel: Kernel command line: ro root=/dev/xvda1
console=xvc0 console=hvc0 xencons=hvc
Apr 11 16:55:42 s1 kernel: Initializing CPU#0
Apr 11 16:55:42 s1 kernel: PID hash table entries: 4096 (order: 12, 32768
bytes)
Apr 11 16:55:42 s1 kernel: Xen reported: 2009.260 MHz processor.
Apr 11 16:55:42 s1 kernel: Console: colour dummy device 80x25
Apr 11 16:55:42 s1 kernel: Dentry cache hash table entries: 262144 (order:
9, 2097152 bytes)
Apr 11 16:55:42 s1 kernel: Inode-cache hash table entries: 131072 (order:
8, 1048576 bytes)
Apr 11 16:55:42 s1 kernel: Software IO TLB disabled
Apr 11 16:55:42 s1 kernel: Memory: 2043384k/2097152k available (2513k
kernel code, 53108k reserved, 1395k data, 184k init)
Apr 11 16:55:42 s1 kernel: Calibrating delay using timer specific routine..
5025.13 BogoMIPS (lpj=10050261)
Apr 11 16:55:42 s1 kernel: Security Framework v1.0.0 initialized
Apr 11 16:55:42 s1 kernel: SELinux:  Initializing.
Apr 11 16:55:42 s1 kernel: selinux_register_security:  Registering
secondary module capability
Apr 11 16:55:42 s1 kernel: Capability LSM initialized as secondary
Apr 11 16:55:42 s1 kernel: Mount-cache hash table entries: 256
Apr 11 16:55:42 s1 kernel: CPU: L1 I Cache: 64K (64 bytes/line), D cache
64K (64 bytes/line)
Apr 11 16:55:42 s1 kernel: CPU: L2 Cache: 512K (64 bytes/line)
Apr 11 16:55:42 s1 kernel: CPU: Physical Processor ID: 0
Apr 11 16:55:42 s1 kernel: CPU: Processor Core ID: 0
Apr 11 16:55:42 s1 kernel: (SMP-)alternatives turned off
Apr 11 16:55:42 s1 kernel: Brought up 1 CPUs
Apr 11 16:55:42 s1 kernel: checking if image is initramfs... it is
Apr 11 16:55:42 s1 kernel: Grant table initialized
Apr 11 16:55:42 s1 kernel: NET: Registered protocol family 16
Apr 11 16:55:42 s1 kernel: Brought up 1 CPUs
Apr 11 16:55:42 s1 kernel: PCI: setting up Xen PCI frontend stub
Apr 11 16:55:42 s1 kernel: ACPI: Interpreter disabled.
Apr 11 16:55:42 s1 kernel: Linux Plug and Play Support v0.97 (c) Adam Belay
Apr 11 16:55:42 s1 kernel: pnp: PnP ACPI: disabled
Apr 11 16:55:42 s1 kernel: xen_mem: Initialising balloon driver.
Apr 11 16:55:42 s1 kernel: usbcore: registered new driver usbfs
Apr 11 16:55:42 s1 kernel: usbcore: registered new driver hub
Apr 11 16:55:42 s1 kernel: PCI: System does not support PCI
Apr 11 16:55:42 s1 kernel: PCI: System does not support PCI
Apr 11 16:55:42 s1 kernel: NetLabel: Initializing
Apr 11 16:55:42 s1 kernel: NetLabel:  domain hash size = 128
Apr 11 16:55:42 s1 kernel: NetLabel:  protocols = UNLABELED CIPSOv4
Apr 11 16:55:42 s1 kernel: NetLabel:  unlabeled traffic allowed by default
Apr 11 16:55:42 s1 kernel: NET: Registered protocol family 2
Apr 11 16:55:42 s1 kernel: IP route cache hash table entries: 65536 (order:
7, 524288 bytes)
Apr 11 16:55:42 s1 kernel: TCP established hash table entries: 262144
(order: 10, 4194304 bytes)
Apr 11 16:55:42 s1 kernel: TCP bind hash table entries: 65536 (order: 8,
1048576 bytes)
Apr 11 16:55:42 s1 kernel: TCP: Hash tables configured (established 262144
bind 65536)
Apr 11 16:55:42 s1 kernel: TCP reno registered
Apr 11 16:55:42 s1 kernel: audit: initializing netlink socket (disabled)
Apr 11 16:55:42 s1 kernel: type=2000 audit(1365692095.507:1): initialized
Apr 11 16:55:42 s1 kernel: VFS: Disk quotas dquot_6.5.1
Apr 11 16:55:42 s1 kernel: Dquot-cache hash table entries: 512 (order 0,
4096 bytes)
Apr 11 16:55:42 s1 kernel: Initializing Cryptographic API
Apr 11 16:55:42 s1 kernel: alg: No test for crc32c (crc32c-generic)
Apr 11 16:55:42 s1 kernel: ksign: Installing public key data
Apr 11 16:55:42 s1 kernel: Loading keyring
Apr 11 16:55:42 s1 kernel: - Added public key 12AFE3EA6A14161C
Apr 11 16:55:42 s1 kernel: - User ID: CentOS (Kernel Module GPG key)
Apr 11 16:55:42 s1 kernel: io scheduler noop registered
Apr 11 16:55:42 s1 kernel: io scheduler anticipatory registered
Apr 11 16:55:42 s1 kernel: io scheduler deadline registered
Apr 11 16:55:42 s1 kernel: io scheduler cfq registered (default)
Apr 11 16:55:42 s1 kernel: pci_hotplug: PCI Hot Plug PCI Core version: 0.5
Apr 11 16:55:42 s1 kernel: rtc: IRQ 8 is not free.
Apr 11 16:55:42 s1 kernel: Non-volatile memory driver v1.2
Apr 11 16:55:42 s1 kernel: Linux agpgart interface v0.101 (c) Dave Jones
Apr 11 16:55:42 s1 kernel: brd: module loaded
Apr 11 16:55:42 s1 kernel: Xen virtual console successfully installed as
xvc0
Apr 11 16:55:42 s1 kernel: Event-channel device installed.
Apr 11 16:55:42 s1 kernel: Uniform Multi-Platform E-IDE driver Revision:
7.00alpha2
Apr 11 16:55:42 s1 kernel: ide: Assuming 50MHz system bus speed for PIO
modes; override with idebus=xx
Apr 11 16:55:42 s1 kernel: ide-floppy driver 0.99.newide
Apr 11 16:55:42 s1 kernel: usbcore: registered new driver hiddev
Apr 11 16:55:42 s1 kernel: usbcore: registered new driver usbhid
Apr 11 16:55:42 s1 kernel: drivers/usb/input/hid-core.c: v2.6:USB HID core
driver
Apr 11 16:55:42 s1 kernel: PNP: No PS/2 controller found. Probing ports
directly.
Apr 11 16:55:42 s1 kernel: i8042.c: No controller found.
Apr 11 16:55:42 s1 kernel: mice: PS/2 mouse device common for all mice
Apr 11 16:55:42 s1 kernel: md: md driver 0.90.3 MAX_MD_DEVS=256,
MD_SB_DISKS=27
Apr 11 16:55:42 s1 kernel: md: bitmap version 4.39
Apr 11 16:55:42 s1 kernel: TCP bic registered
Apr 11 16:55:42 s1 kernel: Initializing IPsec netlink socket
Apr 11 16:55:42 s1 kernel: NET: Registered protocol family 1
Apr 11 16:55:42 s1 kernel: NET: Registered protocol family 17
Apr 11 16:55:42 s1 kernel: XENBUS: Device with no driver: device/vbd/51712
Apr 11 16:55:42 s1 kernel: XENBUS: Device with no driver: device/vif/0
Apr 11 16:55:42 s1 kernel: Initalizing network drop monitor service
Apr 11 16:55:42 s1 kernel: Write protecting the kernel read-only data: 483k
Apr 11 16:55:42 s1 kernel: USB Universal Host Controller Interface driver
v3.0
Apr 11 16:55:42 s1 kernel: Fusion MPT base driver 3.04.13rh
Apr 11 16:55:42 s1 kernel: Copyright (c) 1999-2008 LSI Corporation
Apr 11 16:55:42 s1 kernel: SCSI subsystem initialized
Apr 11 16:55:42 s1 kernel: Fusion MPT SPI Host driver 3.04.13rh
Apr 11 16:55:42 s1 kernel: device-mapper: uevent: version 1.0.3
Apr 11 16:55:42 s1 kernel: device-mapper: ioctl: 4.11.5-ioctl (2007-12-12)
initialised: dm-devel at redhat.com
Apr 11 16:55:42 s1 kernel: device-mapper: dm-raid45: initialized v0.2594l
Apr 11 16:55:42 s1 kernel: SGI XFS with ACLs, security attributes, large
block/inode numbers, no debug enabled
Apr 11 16:55:42 s1 kernel: SGI XFS Quota Management subsystem
Apr 11 16:55:42 s1 kernel: Registering block device major 202
Apr 11 16:55:42 s1 kernel:  xvda: xvda1 xvda2 xvda3
Apr 11 16:55:42 s1 kernel: netfront: Initialising virtual ethernet driver.
Apr 11 16:55:42 s1 kernel: netfront: device eth0 has copying receive path.
Apr 11 16:55:42 s1 kernel: EXT3-fs: INFO: recovery required on readonly
filesystem.
Apr 11 16:55:42 s1 kernel: EXT3-fs: write access will be enabled during
recovery.
Apr 11 16:55:42 s1 kernel: kjournald starting.  Commit interval 5 seconds
Apr 11 16:55:42 s1 kernel: EXT3-fs: recovery complete.
Apr 11 16:55:42 s1 kernel: EXT3-fs: mounted filesystem with ordered data
mode.
Apr 11 16:55:42 s1 kernel: SELinux:  Disabled at runtime.
Apr 11 16:55:42 s1 kernel: type=1404 audit(1365692123.036:2): selinux=0
auid=4294967295 ses=4294967295
Apr 11 16:55:42 s1 kernel: input: PC Speaker as /class/input/input0
Apr 11 16:55:42 s1 kernel: Floppy drive(s): fd0 is unknown type 15 (usb?),
fd1 is unknown type 15 (usb?)
Apr 11 16:55:42 s1 kernel: Failed to obtain physical IRQ 6
Apr 11 16:55:42 s1 kernel: floppy0: no floppy controllers found
Apr 11 16:55:42 s1 kernel: lp: driver loaded but no devices found
Apr 11 16:55:42 s1 kernel: md: Autodetecting RAID arrays.
Apr 11 16:55:42 s1 kernel: md: autorun ...
Apr 11 16:55:42 s1 kernel: md: ... autorun DONE.
Apr 11 16:55:42 s1 kernel: device-mapper: multipath: version 1.0.5 loaded
Apr 11 16:55:42 s1 kernel: EXT3 FS on xvda1, internal journal
Apr 11 16:55:42 s1 kernel: Filesystem "dm-0": Disabling barriers, trial
barrier write failed
Apr 11 16:55:42 s1 kernel: XFS mounting filesystem dm-0
Apr 11 16:55:42 s1 kernel: Starting XFS recovery on filesystem: dm-0
(logdev: internal)
Apr 11 16:55:42 s1 kernel: Ending XFS recovery on filesystem: dm-0 (logdev:
internal)
Apr 11 16:55:42 s1 kernel: Filesystem "dm-1": Disabling barriers, trial
barrier write failed
Apr 11 16:55:42 s1 kernel: XFS mounting filesystem dm-1
Apr 11 16:55:42 s1 kernel: Starting XFS recovery on filesystem: dm-1
(logdev: internal)
Apr 11 16:55:42 s1 kernel: Ending XFS recovery on filesystem: dm-1 (logdev:
internal)
Apr 11 16:55:42 s1 kernel: Filesystem "dm-2": Disabling barriers, trial
barrier write failed
Apr 11 16:55:42 s1 kernel: XFS mounting filesystem dm-2
Apr 11 16:55:42 s1 kernel: Adding 1959920k swap on /dev/xvda2.  Priority:-1
extents:1 across:1959920k
Apr 11 16:55:43 s1 kernel: ip_tables: (C) 2000-2006 Netfilter Core Team
Apr 11 16:55:43 s1 kernel: Netfilter messages via NETLINK v0.30.
Apr 11 16:55:43 s1 kernel: ip_conntrack version 2.4 (8192 buckets, 65536
max) - 304 bytes per conntrack
Apr 11 16:55:44 s1 kernel: NET: Registered protocol family 10
Apr 11 16:55:44 s1 kernel: lo: Disabled Privacy Extensions
Apr 11 16:55:44 s1 kernel: IPv6 over IPv4 tunneling driver
Apr 11 16:55:44 s1 kernel: ip6_tables: (C) 2000-2006 Netfilter Core Team
Apr 11 16:55:46 s1 xinetd[1426]: xinetd Version 2.3.14 started with libwrap
loadavg labeled-networking options compiled in.
Apr 11 16:55:46 s1 xinetd[1426]: Started working: 2 available services


What can we do? what can we test?

More information...




Kernel:

Linux 2.6.18-194.26.1.el5xen #1 SMP Tue Nov 9 13:35:30 EST 2010 x86_64
x86_64 x86_64 GNU/Linux



RAM (in MB):

             total       used       free     shared    buffers     cached
Mem:          2048       1662        385          0         13        506
-/+ buffers/cache:       1142        905
Swap:         1913          0       1913




Disc usage:

S. fitxers            Mida En ús Lliure %Ús Muntat en
/dev/xvda1            3.7G  1.9G  1.8G  52% /
/dev/mapper/vg00-usr   13G  1.4G   12G  11% /usr
/dev/mapper/vg00-var   66G   22G   45G  33% /var
/dev/mapper/vg00-home
                      4.0G  4.2M  4.0G   1% /home
none                  1.0G     0  1.0G   0% /tmp



CPU:

processor    : 0
vendor_id    : AuthenticAMD
cpu family    : 16
model        : 8
model name    : Six-Core AMD Opteron(tm) Processor 2423 HE
stepping    : 0
cpu MHz        : 2009.260
cache size    : 512 KB
physical id    : 0
siblings    : 1
core id        : 0
cpu cores    : 1
fpu        : yes
fpu_exception    : yes
cpuid level    : 5
wp        : yes
flags        : fpu de tsc msr pae cx8 apic cmov pat clflush mmx fxsr sse
sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow constant_tsc pni cx16
popcnt lahf_lm cmp_legacy cr8_legacy abm sse4a misalignsse
bogomips    : 5025.13
TLB size    : 1024 4K pages
clflush size    : 64
cache_alignment    : 64
address sizes    : 48 bits physical, 48 bits virtual
power management: ts ttp tm stc [6] [7] [8]



Thank's!

--
---
Salut!



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