Ubuntu 22.04 기본설정

안녕하세요 유똥입니다.

Ubutnu 22.04 설치 후 기본설정에 대해서 포스팅 진행하겠습니다.

 

 root 권한 로그인 및 패스워드 변경

sudo su - root
[sudo] password for

passwd root
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully

 

 패키지 리스트 갱신

apt-get update
Hit:1 http://kr.archive.ubuntu.com/ubuntu focal InRelease
Get:2 http://kr.archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]
Get:3 http://kr.archive.ubuntu.com/ubuntu focal-backports InRelease [108 kB]
Get:4 http://kr.archive.ubuntu.com/ubuntu focal-security InRelease [114 kB]
Fetched 336 kB in 2s (148 kB/s)
Reading package lists... Done

 

 SSH RootLogin 설정

1) PermitRootLogin 활성화
root@q391-0000:~# vim /etc/ssh/sshd_config
PermitRootLogin yes

2) SSH 서비스 재시작
root@q391-0000:~# systemctl restart sshd.service

 

 유용한 패키지 설치

※ ifconfig
root@q391-0000:~# apt-get install -y net-tools

※ lsof
root@q391-0000:~# apt-get install -y lsof 

※ tcp_wrappers
root@q391-0000:~# apt-get install -y tcpd

※ iptraf
root@q391-0000:~# apt-get install -y iptraf

※ sysstat (sar)
root@q391-0000:~# apt-get install -y sysstat

※ dev tool 
root@q391-0000:~# apt-get install -y build-essential

 

 시간 동기화 설정

1) Time Zone 설정
※ UTC -> KST로 변경

root@q391-0000:~# date
Tue May  3 06:26:42 AM UTC 2022

root@q391-0000:~# timedatectl set-timezone Asia/Seoul

root@q391-0000:~# date
Tue May  3 03:26:45 PM KST 2022

2) rdate 설치 및 시간 동기화
※ NTP 동기화도 가능하나 123번포트 허용이 필요한 부분이 있어 rdate 사용

root@q391-0000:~# apt-get install -y rdate

root@q391-0000:~# /usr/sbin/rdate -s time.bora.net; /sbin/hwclock --systohc

3) crontab 스케줄 등록
root@q391-0000:~# crontab -e

no crontab for root - using an empty one
Select an editor. To change later, run 'select-editor'.

1. /bin/nano <---- easiest
2. /usr/bin/vim.basic
3. /usr/bin/vim.tiny
4. /bin/ed

Choose 1-4 [1]: 2

root@q391-0000:~# crontab -l
# Time
14 3 * * * /usr/sbin/rdate -s time.bora.net; /sbin/hwclock --systohc

 

 네트워크 설정

1) 이더넷 디바이스 적용
vim /etc/netplan/00-installer-config.yaml

network:

  ethernets:
    eno1:
      addresses:
      - IP/25
      routes:
        - to: default
          via: 게이트웨이
      nameservers:
        addresses:
        - 210.220.163.82
        - 219.250.36.130
        - 168.126.63.1
        - 168.126.63.2
        - 164.124.107.9
        - 203.248.252.2
        - 8.8.8.8
        - 8.8.4.4
        search: []
    eno2:
      dhcp4: true
  version: 2

root@q391-0000:~# netplan apply

root@q391-0000:~# resolvectl status
Link 2 (eno1)
    Current Scopes: DNS
         Protocols: +DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
Current DNS Server: 210.220.163.82
       DNS Servers: 210.220.163.82 219.250.36.130 168.126.63.1 168.126.63.2 164.124.107.9 203.248.252.2 8.8.8.8 8.8.4.4
       
       2) systemd-resolve (Global) 적용
       vim /etc/systemd/resolved.conf

[Resolve]
# SK
DNS=210.220.163.82
DNS=219.250.36.130

# KT
DNS=168.126.63.1
DNS=168.126.63.2

# LG
DNS=164.124.107.9
DNS=203.248.252.2

# GOOGLE
DNS=8.8.8.8
DNS=8.8.4.4

root@q391-0000:~# systemctl restart systemd-resolved.service

root@q391-0000:~# resolvectl status
Global
         Protocols: -LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
  resolv.conf mode: stub
Current DNS Server: 210.220.163.82
       DNS Servers: 210.220.163.82 219.250.36.130 168.126.63.1 168.126.63.2 164.124.107.9 203.248.252.2 8.8.8.8 8.8.4.4

 

 커널 튜닝

vim /etc/security/limits.conf
* soft nproc 65535
* hard nproc 65535
* soft nofile 65535
* hard nofile 65535
root soft nproc 65535
root hard nproc 65535
root soft nofile 65535
root hard nofile 65535
* soft memlock unlimited
* hard memlock unlimited

vim /etc/sysctl.conf               
vm.max_map_count = 262144
net.core.somaxconn = 2048
net.core.netdev_max_backlog = 5000
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_wmem = 4096 12582912 16777216
net.ipv4.tcp_rmem = 4096 12582912 16777216
net.ipv4.tcp_max_syn_backlog = 8096
net.ipv4.tcp_slow_start_after_idle = 0
net.ipv4.tcp_tw_reuse = 1
net.ipv4.ip_local_port_range = 10240 65535

 

이로서 Ubuntu 22.04 기본 설정에 대해서 알아보았습니다.

 

도움이 되셨다면 구독과 좋아요

궁금하신 내용이 있으시다면 댓글 부탁드리겠습니다!!

 

정리.txt

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