[Infrastructure] Linux command, shell script collection


-** Network command ** -** Server command **

Network command

◆ netstat -anp

--Get port usage

$ netstat -anp
 Proto     Local Address         Foreign Address      State
  TCP           LISTENING
  TCP           LISTENING 

◆ ipconfig

--ipconfig: Windows command environment --ifconfig: UNIX command environment

//Checking the network environment
$ ipconfig /all
$ ipconfig addr show

◆ hostname

--Check the server host name

$ hostname
$ uname -n
$ uname -a //Detail View


◆ Displaying the contents of the routing table

--Metric: Route with a small metric value is registered in the routing table as the optimal destination route.

$ route print
Network Destination   Netmask    Gateway       Interface   Metric   1

◆ Add routing (Linux)

//IP address: Gateway: Subnet mask:
$ route add -net gw metric 1 netmask eth0

Server command

◆ w

--Simple output of the current `` server status''

$ w
 16:40:10 up  1:26,  1 user,  load average: 0.00, 0.01, 0.00
USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT
vagrant  pts/0         15:28    0.00s  0.17s  0.00s w

◆ vmstat

--Display various ``` resource usage` ``

$ vmstat 1 3   //3 process display in 1 second unit
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 0  0  59188 140888 162272 1216520    3    3     6    88    6    7  2  1 94  3  0
 0  0  59188 140880 162272 1216548    0    0     0     0  186  366  1  0 99  0  0
 0  0  59188 140880 162272 1216548    0    0     0     0  168  362  1  1 99  0  0

◆ iostat

--Display CPU usage'' with option "-c" --Display usage status of I/O device `` with option "-d"

$ iostat
Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
vda               0.46         2.63         9.55    2239142    8134170
vdb               0.00         0.00         0.00       1754          8


-Command collection often used as an infrastructure engineer -[Ionice] command-change disk I/O priority -12 commands for "what if" that occurs in IT infrastructure

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