Ubuntu Notes

adding more space and extending LVM

# allocate more space on hypervisor
# make the partition see the space (dev/sda3, Resize, Write, quit)
sudo cfdisk
# extend the physical volume from the partition
sudo pvresize /dev/sda3
# extend LV to use up all space from VG
sudo lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv
# resize file system
sudo resize2fs /dev/ubuntu-vg/ubuntu-lv
# check can see the space on filesystem
df -h

Remove folder /etc/update-motd.d/

Set Static IP

Edit file /etc/netplan/50-cloud-init.yaml

network:
  version: 2
  renderer: networkd
  ethernets:
    ens18:
      dhcp4: no
      addresses:
        - 192.168.1.27/24
      routes:
        - to: default
          via: 192.168.1.1
      nameservers:
        addresses: [192.168.1.1]

sudo netplan apply

Change Hostname

Change it in /etc/hosts and /etc/hostname

Install Docker

Add User

sudo adduser username usermod -aG sudo username

Fix date and time

sudo timedatectl set-timezone America/Boise

Disable IPV6

I successfully disabled IPv6 once putting the following lines in /etc/sysctl.conf:

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1

also run this command to load changes

sudo sysctl -p

Clean up disk space

sudo journalctl --vacuum-size=300M reduces the logs to 300 MB
sudo logrotate /etc/logrotate.conf compresses or (?) deletes system logs
sudo apt-get autoremove removes software that are only dependencies to packages you removed earlier and don't need anymore
sudo apt-get clean this is nearly the same as sudo rm -rf /var/cache/apt/archives/* and deletes cached downloaded packages for installation. Running this during some installations could be a problem.