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Install Multipath TCP kernel on Digital Ocean VPS (Ubuntu)
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README.md

Digital Ocean MPTCP kernel installation guide

Install Multipath TCP kernel on Digital Ocean VPS (Ubuntu)
(all command are launched as root)

Install MPTCP kernel

# apt-key adv --keyserver hkp://keys.gnupg.net --recv-keys 379CE192D401AB61
# echo 'deb http://dl.bintray.com/cpaasch/deb jessie main' >> /etc/apt/sources.list
# apt-get update
# apt-get install linux-mptcp   # select "install package mantainer" if asked

Edit GRUB

# nano /etc/default/grub

And edit following lines:

GRUB_DEFAULT=saved
GRUB_SAVEDEFAULT=true
GRUB_DISABLE_SUBMENU=y

# nano /etc/default/grub.d/50-cloudimg-settings.cfg

And comment following line, if present

#GRUB_DEFAULT=0

Show all installed kernels

# export GRUB_CONFIG=`find /boot -name "grub.cfg"`
# update-grub
# grep 'menuentry ' $GRUB_CONFIG | cut -f 2 -d "'" | nl -v 0

Test kernel

Choose the MPTCP kernel from the list and set it as kernel for next boot only

# grub-reboot 'Ubuntu, with Linux 4.9.60.mptcp'
# reboot

So, if something went wrong, you can reboot again from control panel, and the default kernel will be used

Show actual kernel

Check if you the running kernel is MPTCP

# uname -ir

Change kernel

Set the MPTCP kernel as default

# grub-set-default 'Ubuntu, with Linux 4.9.60.mptcp'
# reboot

Test MPTCP

Check if MPTCP is working

$ curl www.multipath-tcp.org
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