gistfile1.txt

# Excerpt from Dockerfile

COPY . /www
WORKDIR /www
RUN curl -sS https://getcomposer.org/installer | /usr/bin/php -- --install-dir=/www --filename=composer
RUN ./composer install
RUN chown -R www-data:www-data /www
EXPOSE 9000
CMD /usr/sbin/php5-fpm -F

# Excerpt from docker-compose.yml

webapp:
   build: .
   volumes:
     - .:/www
nginx:
  image: nginx:1.7
  volumes:
    - docker/nginx.conf:/etc/nginx/nginx.conf:ro
    - /var/log/nginx:/var/log/nginx
    - public:/www/public
  links:
    - webapp
  ports:
    - "8000:80"

# After rebuild and recreate, I nsenter into the webapp container:

root@0b92ab1dd595:/# ls www/vendor
root@0b92ab1dd595:/# mount
/dev/mapper/docker-8:1-262153-0b92ab1dd595d5dbe2efbfa85c275b0980b85d65f4ec0adb61d657b17fa3bdd9 on / type ext4 (rw,relatime,discard,stripe=16,data=ordered)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev type tmpfs (rw,nosuid,mode=755)
shm on /dev/shm type tmpfs (rw,nosuid,nodev,noexec,relatime,size=65536k)
mqueue on /dev/mqueue type mqueue (rw,nosuid,nodev,noexec,relatime)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=666)
sysfs on /sys type sysfs (ro,nosuid,nodev,noexec,relatime)
/dev/disk/by-uuid/89172637-1f45-49fe-89ca-d5b8a2a89bd4 on /etc/resolv.conf type ext4 (rw,relatime,data=ordered)
/dev/disk/by-uuid/89172637-1f45-49fe-89ca-d5b8a2a89bd4 on /etc/hostname type ext4 (rw,relatime,data=ordered)
/dev/disk/by-uuid/89172637-1f45-49fe-89ca-d5b8a2a89bd4 on /etc/hosts type ext4 (rw,relatime,data=ordered)
none on /www type vboxsf (rw,nodev,relatime)
/dev/disk/by-uuid/89172637-1f45-49fe-89ca-d5b8a2a89bd4 on /www/public type ext4 (rw,relatime,data=ordered)
/dev/disk/by-uuid/89172637-1f45-49fe-89ca-d5b8a2a89bd4 on /www/vendor type ext4 (rw,relatime,data=ordered)
proc on /proc/sys type proc (ro,nosuid,nodev,noexec,relatime)
proc on /proc/sysrq-trigger type proc (ro,nosuid,nodev,noexec,relatime)
proc on /proc/irq type proc (ro,nosuid,nodev,noexec,relatime)
proc on /proc/bus type proc (ro,nosuid,nodev,noexec,relatime)
tmpfs on /proc/kcore type tmpfs (rw,nosuid,mode=755)

# Why are there separate montpoints for /www, /www/public, and /www/vendor? 
# And why is /www/vendor empty, when it's not on my docker host?