docker-machine-mkswap.sh

#!/bin/sh

if [ "$1" = "" ]; then
    echo "Usage: $0 <host> [<fallocate length>]"
    exit 1
fi

DOCKER_MACHINE_HOST_NAME=$1
DOCKER_MACHINE_SWAP_SIZE=${DOCKER_MACHINE_SWAP_SIZE:-2G}

exec docker-machine ssh $1 -- sh -x << EOF
    if [ ! -f /var/swapfile ]; then
        fallocate -l ${DOCKER_MACHINE_SWAP_SIZE} /var/swapfile
        mkswap /var/swapfile
        chmod -v 600 /var/swapfile
        echo "/var/swapfile none swap sw 0 0" >> /etc/fstab
    fi

    sysctl vm.swappiness=10 > /etc/sysctl.d/11-vm-swappiness.conf
    sysctl vm.vfs_cache_pressure=50 > /etc/sysctl.d/11-vm-vfs-cache-pressure.conf

    swapon -a && swapon -s
EOF