Script to recreate docker containers to fix the host port to the current dynamically assigned port

README.md

Get the current running containers:

# docker --host unix:///var/vcap/sys/run/docker/docker.sock ps
CONTAINER ID        IMAGE                  COMMAND             CREATED             STATUS                  PORTS                                                                      NAMES
1795b5c8aa16        lnguyen/logstash:1.4   "/scripts/run.sh"   4 days ago          Up Less than a second   0.0.0.0:32768->514/tcp, 0.0.0.0:32769->9200/tcp, 0.0.0.0:32770->9300/tcp   cf-f9404974-4ff9-4658-96d1-4b165d8bf731   
7bd1c38e6c49        lnguyen/logstash:1.4   "/scripts/run.sh"   6 days ago          Up Less than a second   0.0.0.0:32771->514/tcp, 0.0.0.0:32772->9200/tcp, 0.0.0.0:32773->9300/tcp   cf-f99c81b2-efa7-4b90-a9d5-efa882e19875   

Install and run the fix script:

mkdir workspace
cd workspace
wget https://gist.github.com/drnic/78b92daeab0732ffb72b/download
mv download{,.tgz}
tar xfz download.tgz
cd gist78b92*
bundle
chmod +x fix_docker_host_ports.rb
DOCKER_URL=unix:///var/vcap/sys/run/docker/docker.sock bundle exec ./fix_docker_host_ports.rb

fix_docker_host_ports.rb

#!/usr/bin/env ruby

# DOCKER_URL=unix:///var/vcap/sys/run/docker/docker.sock bundle exec ./fix_docker_host_ports.rb

# curl http://containers:[email protected]/v2/service_instances/$RANDOM -d '{
#   "service_id":        "2fd814ac-d1f7-4d4a-a4f7-d386cd8fd8e3",
#   "plan_id":           "1a0efffc-eb45-4bf8-8ee3-a3c1a9a53151",
#   "organization_guid": "org-guid-here",
#   "space_guid":        "space-guid-here"
# }' -X PUT -H "X-Broker-API-Version: 2.4" -H "Content-Type: application/json"

# docker --host unix:///var/vcap/sys/run/docker/docker.sock ps -a
# CONTAINER ID        IMAGE                        COMMAND              CREATED             STATUS              PORTS                     NAMES
# 767a17b0b3c1        frodenas/postgresql:latest   "/scripts/run.sh "   2 seconds ago       Up 1 seconds        0.0.0.0:32772->5432/tcp   cf-foobar
# 38bd802ee1c9        frodenas/postgresql:latest   "/scripts/run.sh "   18 seconds ago      Up 17 seconds       0.0.0.0:32769->5432/tcp   happy_bell
# a4c72c1c504e        frodenas/postgresql:latest   "/scripts/run.sh "   19 seconds ago      Up 18 seconds       0.0.0.0:32770->5432/tcp   dreamy_sinoussi
# ef75144ade79        frodenas/postgresql:latest   "/scripts/run.sh "   19 seconds ago      Up 18 seconds       0.0.0.0:32771->5432/tcp   backstabbing_engelbart

# DOCKER_URL=unix:///var/vcap/sys/run/docker/docker.sock bundle exec ./fix_docker_host_ports.rb
# Removing container /cf-foobar
# Recreating container /cf-foobar
# Restarting container /cf-foobar with ports {"5432/tcp"=>[{"HostIp"=>"0.0.0.0", "HostPort"=>"32772"}]}
# Removing container /happy_bell
# Recreating container /happy_bell
# Restarting container /happy_bell with ports {"5432/tcp"=>[{"HostIp"=>"0.0.0.0", "HostPort"=>"32769"}]}
# Removing container /dreamy_sinoussi
# Recreating container /dreamy_sinoussi
# Restarting container /dreamy_sinoussi with ports {"5432/tcp"=>[{"HostIp"=>"0.0.0.0", "HostPort"=>"32770"}]}
# Removing container /backstabbing_engelbart
# Recreating container /backstabbing_engelbart
# Restarting container /backstabbing_engelbart with ports {"5432/tcp"=>[{"HostIp"=>"0.0.0.0", "HostPort"=>"32771"}]}

# docker --host unix:///var/vcap/sys/run/docker/docker.sock ps -a
# CONTAINER ID        IMAGE                        COMMAND              CREATED             STATUS              PORTS                     NAMES
# a9e32efb1d29        frodenas/postgresql:latest   "/scripts/run.sh "   4 seconds ago       Up 3 seconds        0.0.0.0:32771->5432/tcp   backstabbing_engelbart
# e86a680422c4        frodenas/postgresql:latest   "/scripts/run.sh "   4 seconds ago       Up 3 seconds        0.0.0.0:32770->5432/tcp   dreamy_sinoussi
# 13a9b2989702        frodenas/postgresql:latest   "/scripts/run.sh "   5 seconds ago       Up 4 seconds        0.0.0.0:32769->5432/tcp   happy_bell
# 017f9ce7362d        frodenas/postgresql:latest   "/scripts/run.sh "   5 seconds ago       Up 2 seconds        0.0.0.0:32772->5432/tcp   cf-foobar

require 'docker'

Docker::Container.all.each do |container|
  config = container.json['Config']
  host_config = container.json['HostConfig']

  name = container.json['Name']
  ports = container.json['NetworkSettings']['Ports']
  volumes = container.json['Volumes']

  new_container_options =  config.merge({
    'name' => name,
  })
  start_container_options = host_config.merge({
    'PortBindings' => ports,
  })

  puts "Removing container #{name}"
  container.remove(force: true)
  puts "Recreating container #{name}"
  new_container = Docker::Container.create(new_container_options)
  puts "Restarting container #{name} with ports #{ports.inspect}"
  new_container.start(start_container_options)
end

Gemfile

source "https://rubygems.org"

gem "docker-api"