Ubuntu 18/20 相關設定整理

這是本文件的舊版！

參考

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. 兩張網卡指定 default route 為 eth0

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

network:
  ethernets:
    eth0:
      dhcp4: true
    eth1:
      addresses: [192.168.7.101/24]
      routes:
        - to: 192.168.7.0/24
          via: 192.168.7.1
          metric: 40
          table: 200
      nameservers:
         addresses: [8.8.8.8,168.95.192.1]
      dhcp4: no
  version: 2

localadmin@iiidevops-1:~$ ip route
default via 172.17.13.177 dev eth0 proto dhcp src 172.17.13.189 metric 100
172.17.13.176/28 dev eth0 proto kernel scope link src 172.17.13.189
172.17.13.177 dev eth0 proto dhcp scope link src 172.17.13.189 metric 100
192.168.7.0/24 dev eth1 proto kernel scope link src 192.168.7.101

可以透過 sudo netplan apply 立即生效或是 sudo reboot 重新開機後生效

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
```

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

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

ubuntu

Ubuntu 18/20 相關設定整理

網路 IP 設定

更改 hostname

建立使用者命令

VMWare 內出現的 multipathd 異常訊息