Configure Static IP Address

The default configuration files of Netplan are found under /etc/netplan/ directory.

$ ls /etc/netplan/
50-cloud-init.yaml

The default network configuration file is 50-cloud-init.yaml.

$ cat /etc/netplan/50-cloud-init.yaml
# This file is generated from information provided by
# the datasource.  Changes to it will not persist across an instance.
# To disable cloud-init's network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
    version: 2
    ethernets:
        eth0:
            dhcp4: no
            addresses: [10.10.10.212/24]
            gateway4: 10.10.10.20
            nameservers:
                addresses: [8.8.4.4,8.8.8.8]

Apply configuration

$ sudo netplan --debug apply

netplan apply applies the current netplan configuration to a running system.

–debug Print debugging output during the process.

Configure Bridge interface

Install the bridge-utils

$ sudo apt install bridge-utils

Configuration files of Netplan in /etc/netplan/01-netcfg.yaml.

• set bridge interface on eno1
• ip address 10.10.20.12/24
• gateway ipv4 10.10.10.20

Note the optional: true key declarations that allow booting to occur without waiting for those interfaces to activate fully.

$ ls /etc/netplan
01-netcfg.yaml  01-netcfg.yaml.default  01-netcfg.yaml.default.bridges

# show config in `01-netcfg.yaml`
$ cat /etc/netplan/01-netcfg.yaml
network:
  version: 2
  renderer: networkd
  ethernets:
    eno1:
      dhcp4: no
    eno2:
      dhcp4: no
      addresses: [10.10.20.12/24]
      optional: true
  bridges:
    br0:
      dhcp4: no        
      addresses: [10.10.10.12/24]
      gateway4: 10.10.10.20
      nameservers:
        addresses: [8.8.4.4,8.8.8.8]
      interfaces:
      - eno1

SSH

Problem: Permission denied (publickey).

Change PasswordAuthentication no to PasswordAuthentication yes in /etc/ssh/sshd_config

# To disable tunneled clear text passwords, change to no here!
PasswordAuthentication yes

Rsync

Exclude Multiple Files and Directories

• source : username@ip_source ubuntu@10.10.10.12 , directory /home/ubuntu/zurmo
• destination : directory /var/www/html
• exclude dir : app/protected/runtime/uploads/localfiles/*

$ rsync -avP --exclude 'app/protected/runtime/uploads/localfiles/*'  ubuntu@10.10.10.12:/home/ubuntu/zurmo /var/www/html

Shell Prompt

~/.bashrc: find then edit

if [ "$color_prompt" = yes ]; then
    PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u\[\033[00m\]:\[\033[01;34m\]\W\[\033[00m\]\$ '
else
# disable show hostname
    PS1='${debian_chroot:+($debian_chroot)}\u:\W\$ '
fi