Task at a certain time
For user in $ (cat/etc/passwd | cut-f1-d:);d o crontab-l-u $user;d One
Does a user perform a hidden scheduled task? If a task is being backed up
Two networks
sysctl-a | grep xx View network kernel parameter information
Ss-s Show all existing connections
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Cat/proc/interrupts See if the interrupt request is evenly distributed to the CPU, or is there a CPU core overloaded by a large number of network interrupt requests or RAID requests?
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16:6121 6216 io-apic-fasteoi uhci_hcd:usb5, HDA Intel, nvidia
Interrupt number 16 interrupt port, in response to 6,121 interrupts on the cpu0, in response to 6,216 interrupts on the CPU1, the link on the interrupt list on this port device interface is IO-APIC-FASTEOI, the interrupt number is the device named UHCI_HCD:USB5, HDA Intel, Nvidia's several devices are shared.
Three-core message
$ dmesg
$ less/var/log/messages
$ less/var/log/secure
$ less/var/log/auth
Review the error and warning messages, such as see if there is a lot of connections caused by too many?
See if there is a hardware error or a file system error?
Analyze whether these error events can be compared to the previously discovered suspects in time.
4. Disk
sar-d 2 Check the disk's busy level
IOSTAT-KX 2 Check the disk's busy level
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Dstat--top-io--top-bio
See which program is using disk
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Dstat similar to Vmstat can also view disk read and write situations, network transmission, paging and system interrupts, context switching
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For more information, refer to: http://chengeng29.blog.51cto.com/1264594/1769959
Linux monitoring (added)