Linux Server Management: System Management: System Resource View

Vmstat command:

View or monitor system resources

1[Email protected] ~]# Vmstat1 32procs-----------Memory-------------Swap-------io------System-------CPU-----3R b SWPD FreeBuff cache si so bi boinchCS US SyIDWA St4  1  0      0 1683632  21684  60504    0    0     8     1    -    One  0  0  About  1  0    5  0  0      0 1683592  21684  60532    0    0     0     0    -    the  0  1  About  0  0    6  0  0      0 1683592  21684  60532    0    0     0     0    One   Ten  0  0  -  0  0    

Explanation of the above command: View system resources use every second to perform a total of 3 times after the stop

2.DMESG kernel check information at boot time

[[Email protected]/] #dmesg//Will list all startup information because there's too much content we usually use grep behind the query to filter out the information we don't want to see.

[email protected]/] #dmesg | grep CPU

View CPU-related content at boot time

3.free Command View memory usage status

[Email protected]/] #free [-b|-k|-m|-g]

Option-B shows as Byte-K in kilobytes later

We generally use-m or-G to view memory usage or to view memory size

[Email protected]/] #free-M

1[Email protected] ~]# Free-m2Total used Freeshared buffers Cached3Mem:1838        194       1644          0          +          -4-/+ Buffers/cache:113       17245Swap:3999          0       39996[Email protected] ~]# Free-g7Total used Freeshared buffers Cached8Mem:1          0          1          0          0          09-/+ Buffers/cache:0          1TenSwap:3          0          3

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4. The difference between caching and buffering

In a nutshell, cache is used to speed up the data being read from the hard disk, while buffering (buffer) is used to speed up the data written to the hard disk.

5. View CPU Information

Cat/proc/cpuinfo the file is a temporary file, a little reboot changes the file will be newly created, so the information recorded by the file is updated in real time

6.uptime command

The first line of the top command is actually viewed

1 Uptime 2  : $  3:  1 user,  0.00 0.00 0.00

7.uname viewing system and kernel information

uname option:-A To view all relevant information of the system-r view Kernel version-n view hostname-S view kernel name more using man uname

1[Email protected] ~]#uname-N2 localhostA13[Email protected] ~]#uname-s4 Linux5[Email protected] ~]#uname-a6Linux localhostA12.6. +-358. el6.x86_64 #1SMP Fri Feb A xx: to: -Utc -x86_64 x86_64 x86_64 gnu/Linux7[Email protected] ~]#uname-R8 2.6. +-358. el6.x86_64

8. View the number of system bits

1 [[email protected] ~]#  file/bin/ls2 for Gnu/linux 2.6.18, stripped

9. View the Linux system release version

[Email protected] ~]# LSB_RELEASE-ALSB Version::base-4.0-amd64:base-4.0-noarch:core-4.0-amd64:core-4.0-noarch: Graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarchdistributor ID:CentOSDescription: CentOS Release 6.4 (Final) release:6.4codename:final

　

[Email protected] ~]# cat/etc/redhat-6.4 (Final)

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Linux Server Management: System Management: System Resource View