Docker friendlyhello app exec: "docker-proxy" and port binding errors

Question

I'm new to docker. I'm following the instructions on the friendlyhello tutorial. I'm running this on a CentOS 7.5 virtual machine, docker --version is 1.13.1. I get to the point where I run docker run -d -p 4000:80 friendlyhello and get :

$ docker run -p 4000:80 friendlyhello
/usr/bin/docker-current: Error response from daemon: driver failed programming external connectivity on endpoint eager_dijkstra (f022a7a52040c54a54d94270e94a4149554be38514c88cb933d77440f43f6092): exec: "docker-proxy": executable file not found in $PATH.

If I run it again :

$ docker run -p 4000:80 friendlyhello
/usr/bin/docker-current: Error response from daemon: driver failed programming external connectivity on endpoint amazing_wiles (cfb767520e0f130d93cb881917320555ea3eccd605dd845b978e062e1aca3b57): Bind for 0.0.0.0:4000 failed: port is already allocated.

I do not have a docker-proxy executable on my machine.

QUESTION :

1. How do I get friendlyhello to run? Where is docker-proxy?

Answer 1

Evidently I installed docker through just the default yum repos, e.g. yum install docker. This got me docker version 1.13.1. This is incorrect (and non-intuitive), I needed to install it following these instructions from the docker website. This got me docker-proxy and allowed me to run the friendlyhello example (docker version 18.06.1-ce). Reposting the instructions :

## Clean up my previous install
$ sudo yum remove docker \
                  docker-client \
                  docker-client-latest \
                  docker-common \
                  docker-latest \
                  docker-latest-logrotate \
                  docker-logrotate \
                  docker-selinux \
                  docker-engine-selinux \
                  docker-engine

$ sudo yum install -y yum-utils \
  device-mapper-persistent-data \
  lvm2

### This is the repo to get the correct docker distribution
$ sudo yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo

$ sudo yum install docker-ce