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September 22, 2015 02:57
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Multipath TCP kernel on DigitalOcean droplet (Ubuntu 14.04)
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| (all instruction need root permission) | |
| 0. Create a droplet with Ubuntu 14.04 image | |
| 1. wget -q -O - http://multipath-tcp.org/mptcp.gpg.key | sudo apt-key add - | |
| 2. vim /etc/apt/sources.list.d/mptcp.list , add line: | |
| deb http://multipath-tcp.org/repos/apt/debian trusty main | |
| 3. apt-get update && apt-get install linux-mptcp | |
| 4. vim /etc/init.d/droplet-kernel | |
| ### BEGIN INIT INFO | |
| # Provides: droplet-kernel | |
| # Required-Start: | |
| # Required-Stop: | |
| # Should-Start: glibc | |
| # Default-Start: S | |
| # Default-Stop: 6 | |
| # X-Interactive: true | |
| # Short-Description: Run kexec on DigitalOcean droplet | |
| # Description: Runs kexec on a DigitalOcean droplet to boot a custom kernel | |
| ### END INIT INFO | |
| PATH=/sbin:/bin:/usr/sbin:/usr/bin | |
| . /lib/lsb/init-functions | |
| test -r /etc/default/droplet-kernel && . /etc/default/droplet-kernel | |
| do_stop() { | |
| # Don't do anything if kexec-tools are not installed | |
| # or droplet-kernel is not enabled in defaults file. | |
| test -x /sbin/kexec || exit 0 | |
| test "$ENABLED" = "true" || exit 0 | |
| # Check 'kexeced' kernel cmdline is present otherwise droplet | |
| # wasn't booted with a custom kernel via kexec. | |
| if grep -q ' kexeced$' /proc/cmdline; then | |
| # Remove 'kexeced' cmdline arguement so that when the droplet | |
| # is rebooted it will load and boot the custom kernel again. | |
| cat /proc/cmdline | sed 's/ kexeced$//' > /root/cmdline | |
| mount --bind -n -o ro /root/cmdline /proc/cmdline >/dev/null | |
| kexec -u | |
| log_action_msg "Removed 'kexeced' kernel cmdline from droplet" | |
| else | |
| log_action_msg "Droplet was not booted with custom kernel" | |
| fi | |
| } | |
| do_start() { | |
| # Don't do anything if kexec-tools are not installed | |
| # or droplet-kernel is not enabled in defaults file. | |
| test -x /sbin/kexec || exit 0 | |
| test "$ENABLED" = "true" || exit 0 | |
| do_status | |
| # Check 'kexeced' kernel cmdline is not present. | |
| # If it is, the droplet has already booted with kexec. This helps | |
| # prevent loops. | |
| if grep -qv ' kexeced$' /proc/cmdline; then | |
| # Give the option to abort booting the droplet using kexec. | |
| export KEXEC_ABORT=false | |
| trap "export KEXEC_ABORT=true" 2 | |
| log_begin_msg "Press Ctrl+C to abort booting droplet with custom kernel" | |
| sleep 10 | |
| trap - 2 | |
| log_end_msg 0 | |
| REAL_APPEND="$APPEND" | |
| test -z "$REAL_APPEND" && REAL_APPEND="`cat /proc/cmdline`" | |
| if [ "$KEXEC_ABORT" = "false" ]; then | |
| log_action_begin_msg "Loading new kernel in to droplet memory" | |
| if [ -z "$INITRD" ]; then | |
| kexec --load "$KERNEL_IMAGE" --append="$REAL_APPEND kexeced" | |
| else | |
| kexec --load "$KERNEL_IMAGE" --initrd="$INITRD" --append="$REAL_APPEND kexeced" | |
| fi | |
| log_action_end_msg $? | |
| log_action_begin_msg "Attempting to run droplet with custom kernel" | |
| kexec -e | |
| log_action_end_msg $? | |
| fi | |
| fi | |
| } | |
| do_status() { | |
| if [ "$ENABLED" != "true" ]; then | |
| log_action_msg "Custom droplet kernel is NOT enabled" | |
| exit 0 | |
| fi | |
| log_action_msg "Custom droplet kernel is enabled" | |
| if grep -q 'kexeced$' /proc/cmdline; then | |
| log_action_msg "Droplet was booted with a custom kernel" | |
| else | |
| log_action_msg "Droplet was NOT booted with a custom kernel" | |
| fi | |
| } | |
| case "$1" in | |
| start) | |
| do_start | |
| ;; | |
| restart|reload|force-reload) | |
| echo "Error: argument '$1' not supported" >&2 | |
| exit 3 | |
| ;; | |
| stop) | |
| do_stop | |
| ;; | |
| status) | |
| do_status | |
| ;; | |
| *) | |
| echo "Usage: $0 {start|stop|status}" >&2 | |
| exit 3 | |
| ;; | |
| esac | |
| exit 0 | |
| 5. chmod 755 /etc/init.d/droplet-kernel | |
| 6. vim /etc/default/droplet-kernel | |
| # Defaults for droplet-kernel initscript | |
| # sourced by /etc/init.d/droplet-kernel | |
| # Load a custom kernel for the droplet (true/false) | |
| ENABLED=true | |
| # Kernel and initrd image. | |
| # If no initrd image is needed, leave blank. | |
| KERNEL_IMAGE="/vmlinuz" | |
| INITRD="/initrd.img" | |
| # If empty, use current /proc/cmdline | |
| APPEND="" | |
| 7. update-rc.d droplet-kernel defaults | |
| 8. sync;sync;sync;sync;reboot | |
| 9. After reboot, login and check if MPTCP is enabled by: | |
| kernel.osrelease = 3.18.20-90-mptcp | |
| net.mptcp.mptcp_checksum = 1 | |
| net.mptcp.mptcp_debug = 0 | |
| net.mptcp.mptcp_enabled = 1 | |
| net.mptcp.mptcp_path_manager = fullmesh | |
| net.mptcp.mptcp_scheduler = default | |
| net.mptcp.mptcp_syn_retries = 3 | |
| 10. You're all set! |
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