Setting up the docker api - modification of docker.conf - docker

Question

I found a video about setting up the docker remote api by Packt publishing.
In the video we are told to change the /etc/init/docker.conf file by adding "-H tcp://127.0.0.1:4243 -H unix:///var/run/docker/sock" to DOCKER_OPTS=. Then we have to restart docker for the changes to take effect.
However after I do all that, I still can't curl localhost at that port. Doing so returns:
vagrant#vagrant-ubuntu-trusty-64:~$ curl localhost:4243/_ping
curl: (7) Failed to connect to localhost port 4243: Connection refused
I'm relativity new to docker, if somebody could help me out here I'd be very grateful.
Edit:
docker.conf
description "Docker daemon"
start on (filesystem and net-device-up IFACE!=lo)
stop on runlevel [!2345]
limit nofile 524288 1048576
limit nproc 524288 1048576
respawn
kill timeout 20
pre-start script
# see also https://github.com/tianon/cgroupfs-mount/blob/master/cgroupfs-mount
if grep -v '^#' /etc/fstab | grep -q cgroup \
|| [ ! -e /proc/cgroups ] \
|| [ ! -d /sys/fs/cgroup ]; then
exit 0
fi
if ! mountpoint -q /sys/fs/cgroup; then
mount -t tmpfs -o uid=0,gid=0,mode=0755 cgroup /sys/fs/cgroup
fi
(
cd /sys/fs/cgroup
for sys in $(awk '!/^#/ { if ($4 == 1) print $1 }' /proc/cgroups); do
mkdir -p $sys
if ! mountpoint -q $sys; then
if ! mount -n -t cgroup -o $sys cgroup $sys; then
rmdir $sys || true
fi
fi
done
)
end script
script
# modify these in /etc/default/$UPSTART_JOB (/etc/default/docker)
DOCKER=/usr/bin/$UPSTART_JOB
DOCKER_OPTS="-H tcp://127.0.0.1:4243 -H unix:///var/run/docker.sock"
if [ -f /etc/default/$UPSTART_JOB ]; then
. /etc/default/$UPSTART_JOB
fi
exec "$DOCKER" daemon $DOCKER_OPTS
end script
# Don't emit "started" event until docker.sock is ready.
# See https://github.com/docker/docker/issues/6647
post-start script
DOCKER_OPTS=
if [ -f /etc/default/$UPSTART_JOB ]; then
"/etc/init/docker.conf" 60L, 1582C
EDIT2: Output of ps aux | grep docker
vagrant#vagrant-ubuntu-trusty-64:~$ ps aux | grep docker
root 858 0.2 4.2 401836 21504 ? Ssl 06:12 0:00 /usr/bin/docker daemon --insecure-registry 11.22.33.44
:5000
vagrant 1694 0.0 0.1 10460 936 pts/0 S+ 06:15 0:00 grep --color=auto docker

Answer 1

The problem
According to the output of ps aux|grep docker it can be noticed that the options the daemon is started with do not match the ones in the docker.conf file. Another file is then used to start the docker daemon service.
Solution
To solve this, track down the file that contains the option "--insecure-registry 11.22.33.44:5000 that may either /etc/default/docker or /etc/init/docker.conf or /etc/systemd/system/docker.service or idk-where-else and modify it accordingly with the needed options.
Then restart the daemon and you're good to go !