Ubuntu 18/20/22 相關設定整理

Exp. 更改 IP 設定為 192.168.11.204

sudo vi /etc/netplan/00-installer-config.yaml

network:
  ethernets:
    ens18:
      addresses: [192.168.11.204/24]
      gateway4: 192.168.11.1
      nameservers:
        addresses: [8.8.8.8,8.8.4.4]
      dhcp4: no
  version: 2
 

Exp. 設定開啟 tcp port 22(ssh), 80(http), 443(https) 以及 udp port 161(snmp)

ufw allow proto tcp from any to any port 22,80,443 comment 'Open SSH/Web ports'
ufw allow proto udp from any to any port 161 comment 'Open SNMP ports'

參考 - https://askubuntu.com/questions/1452706/problem-with-my-iptables-configuration-on-reboot/1452833#1452833

需要安裝 iptables-persistent 套件

apt install iptables-persistent -y

修改 iptables 規則 Exp.

iptables -I FORWARD -i br0 -p all -j ACCEPT

將修改後的規則寫入 /etc/iptables/rules.v4

iptables-save -c > /etc/iptables/rules.v4

參考 - https://www.itread01.com/content/1541622152.html

先 /etc/cloud/cloud.cfg 內 preserve_hostname 為 true

sudo vi /etc/cloud/cloud.cfg

:
preserve_hostname: true
:

執行 hostnamectl 設定 hostname Exp. 更改為 pve-devops1

sudo hostnamectl set-hostname pve-devops1

Exp. 設定 hostname 為 iServStorM1

sudo su -
vi /etc/hosts

127.0.0.1       localhost
127.0.1.1       iServStorM1
:

vi /etc/hostname

iServStorM1

hostname -F /etc/hostname

參考 - https://www.cyberciti.biz/faq/create-a-user-account-on-ubuntu-linux/

Exp. 建立 localadmin

sudo useradd -s /bin/bash -d /home/localadmin/ -m -G sudo localadmin
sudo passwd localadmin 

如果useradd 建立時沒提供 sudo 權限可以之後透過 usermod 來處理 Exp.

sudo usermod -aG sudo localadmin

參考網址 - https://www.ubuntu-tw.org/modules/newbb/viewtopic.php?post_id=81494

語法 : dpkg -L 套件名稱 Exp. docker

/# dpkg -L docker
/.
/usr
/usr/share
/usr/share/doc
/usr/share/doc/docker
/usr/share/doc/docker/changelog.Debian.gz
/usr/share/doc/docker/copyright

sudo apt-get install --no-install-recommends ubuntu-desktop

參考 - https://askubuntu.com/questions/1242731/ubuntu-20-04-multipath-configuration

在 VMWare 內建立 Ubuntu 20.04 的 VM , 在 /var/log/syslog 會看到以下的異常訊息

~# tail -f /var/log/syslog
Aug 31 10:43:07 iiidevops4 multipathd[747]: sda: add missing path
Aug 31 10:43:09 iiidevops4 multipathd[747]: sda: failed to get udev uid: Invalid argument
Aug 31 10:43:11 iiidevops4 multipathd[747]: sda: failed to get sysfs uid: Invalid argument
Aug 31 10:43:12 iiidevops4 multipathd[747]: sda: failed to get sgio uid: No such file or directory
Aug 31 10:43:17 iiidevops4 multipathd[747]: sda: add missing path

解決方式 :

vi /etc/multipath.conf

defaults {
    user_friendly_names yes
}
blacklist {
    devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st|sda)[0-9]*"
}

systemctl restart multipath-tools

參考 - https://askubuntu.com/questions/257263/how-to-display-network-traffic-in-the-terminal

直接安裝 bmon, slurm, tcptrack 其中一套或都安裝

安裝語法

sudo apt install bmon slurm tcptrack