Tips 관련

uname

uname       # 옵션이 없을 경우, -s 옵션을 사용하는 것과 동일 (i.e. 커널 이름 출력)
uname -s    # Linux
uname -a    # 모든 정보 출력
            # Linux jhpark20.novalocal 3.10.0-1160.el7.x86_64 #1 SMP Mon Oct 19 16:18:59 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
uname -n    # 네트워크 노드 호스트 이름 출력
            # jhpark20.novalocal
uname -r    # 커널 릴리즈 출력
            # 3.10.0-1160.el7.x86_64
uname -v    # 커널 버전 출력
            # #1 SMP Mon Oct 19 16:18:59 UTC 2020
uname -m    # 하드웨어 이름 출력
            # x86_64
uname -p    # 프로세서 타입 출력
            # x86_64
uname -i    # 하드웨어 플랫폼 출력
            # x86_64
uname -o    # 운영체제 출력
            # GNU/Linux

dmidecode CPU/Memory 정보

-t 옵션

번호	정보
0	BIOS
1	System
2	Baseboard
3	Chassis
4	Processor
5	Memory Controller
6	Memory Module
7	Cache
8	Port Connector
9	System Slots
10	On Board Devices
11	OEM Strings
12	System Configuration Options
13	BIOS Language
14	Group Associations
15	System Event Log
16	Physical Memory Array
17	Memory Device
18	32-bit Memory Error
19	Memory Array Mapped Address
20	Memory Device Mapped Address
21	Built-in Pointing Device
22	Portable Battery
23	System Reset
24	Hardware Security
25	System Power Controls
26	Voltage Probe
27	Cooling Device
28	Temperature Probe
29	Electrical Current Probe
30	Out-of-band Remote Access
31	Boot Integrity Services
32	System Boot
33	64-bit Memory Error
34	Management Device
35	Management Device Component
36	Management Device Threshold Data
37	Memory Channel
38	IPMI Device
39	Power Supply
40	Additional Information
41	Onboard Devices Extended Information
42	Management Controller Host Interface

df 디스크 정보

df -h    # 읽기 쉬운 형태로 출력
#
# Filesystem                  Size  Used Avail Use% Mounted on
# devtmpfs                     16G     0   16G   0% /dev
# tmpfs                        16G   24K   16G   1% /dev/shm
# tmpfs                        16G  137M   16G   1% /run
# tmpfs                        16G     0   16G   0% /sys/fs/cgroup
# /dev/mapper/rutilvm-root     47G  5.8G   42G  13% /
# /dev/mapper/rutilvm-home   1014M   40M  975M   4% /home
# /dev/mapper/rutilvm-var      53G  3.7G   50G   7% /var
# /dev/mapper/rutilvm-vartmp  2.0G   47M  2.0G   3% /var/tmp
# /dev/mapper/rutilvm-log      30G  494M   30G   2% /var/log
# /dev/vda1                  1014M  241M  774M  24% /boot
# /dev/mapper/rutilvm-tmp     2.0G  897M  1.2G  44% /tmp
# /dev/mapper/rutilvm-audit  1014M   45M  970M   5% /var/log/audit
# overlay                      53G  3.7G   50G   7% /var/lib/docker/overlay2/f4fb66660bdd6dad5865777e7dc646bbe13b0e8cf2b28f47cd22e3329bdd3d6e/merged
# tmpfs                       3.2G     0  3.2G   0% /run/user/0

ethtool 네트워크 정보

ethtool eth0
#
# Settings for eth0:
#         Supported ports: [  ]
#         Supported link modes:   Not reported
#         Supported pause frame use: No
#         Supports auto-negotiation: No
#         Supported FEC modes: Not reported
#         Advertised link modes:  Not reported
#         Advertised pause frame use: No
#         Advertised auto-negotiation: No
#         Advertised FEC modes: Not reported
#         Speed: Unknown!
#         Duplex: Unknown! (255)
#         Auto-negotiation: off
#         Port: Other
#         PHYAD: 0
#         Transceiver: internal
#         Link detected: yes

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Reduce Swappiness (Optimize Swap Usage)

Swappiness controls how often the system uses swap space instead of RAM. A high swappiness value can lead to excessive swapping, slowing down your system.

To check the current swappiness value:

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