[CENTOS] [Infrastructure] Linux command, shell script collection

Contents

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

Network command

◆ netstat -anp

--Get port usage

$ netstat -anp
 Proto     Local Address         Foreign Address      State
  TCP        0.0.0.0:53             0.0.0.0:0        LISTENING
  TCP        0.0.0.0:80             0.0.0.0:0        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

route

◆ 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
    0.0.0.0          0.0.0.0   192.168.1.254  192.168.1.10   1

◆ Add routing (Linux)

//IP address: 192.168.30.0 Gateway: 192.168.1.254 Subnet mask: 255.255.255.0
$ route add -net 192.168.30.0 gw 192.168.1.254 metric 1 netmask 255.255.255.0 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    10.0.2.2         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

References

-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

• netstat
• ipconfig / ifconfig -Network Command List (Windows) -Route-Display / Set Routing Table -[[Linux] How to add and allocate swap space](https://webbibouroku.com/Blog/Article/linux-swap#:~:text=%E3%82%B9%E3%83%AF%E3% 83% 83% E3% 83% 97% E9% A0% 98% E5% 9F% 9F% 20% E3% 81% A8% E3% 81% AF% E3% 80% 81% E3% 83% A1% E3% 83% A2% E3% 83% AA,% E3% 81% 9F% E3% 82% 81% E3% 80% 81% E3% 81% A7% E3% 81% 8D% E3% 82% 8B% E3% 81 % 93% E3% 81% A8% E3% 81% 8C% E5% A2% 97% E3% 81% 88% E3% 81% BE% E3% 81% 99% E3% 80% 82) -[Iostat] command-Display I/O device usage status -View disk I/O indicators in iostat -Route-Display / Set Routing Table
• Routing - Metric