sudo vim /etc/hostname

hadoop-vm-slave

sudo vim /etc/hosts

127.0.0.1    hadoop-vm-slave

sudo shutdown now -r

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

# This is the network config written by 'subiquity'
network:
  ethernets:
    ens33:
      dhcp4: false
      dhcp6: false
      addresses: [172.37.4.156/16]
      gateway4: 172.37.0.1
      nameservers:
        addresses: [223.5.5.5, 8.8.8.8]
  version: 2

sudo netplan apply

sudo vim /etc/profile

export JAVA_HOME=/opt/jdk/
export PATH=$PATH:$JAVA_HOME/bin

sudo source /etc/profile