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$ docker run -d -name mysql ctlc/mysql 

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$ docker run -d --name wordpress2 --link serf_1:serf_1 -e="DB_PASSWORD=$DB_PASSWORD" -p 80 ctlc/wordpress-serf /run.sh
$ docker run -d --name wordpress3 --link serf_1:serf_1 -e="DB_PASSWORD=$DB_PASSWORD" -p 80 ctlc/wordpress-serf /run.sh
$ docker run -d --name wordpress4 --link serf_1:serf_1 -e="DB_PASSWORD=$DB_PASSWORD" -p 80 ctlc/wordpress-serf /run.sh
$ serf members
packer-virtualbox    10.0.2.15:7946    alive    
b62e43c286c8    172.17.0.76:7946    alive    serf-agent
356dc2b8c86c    172.17.0.77:7946    alive    mysql
44f00d42908a    172.17.0.81:7946    alive    wordpress
37fd075fac46    172.17.0.82:7946    alive    wordpress
32431bfcf1ca    172.17.0.80:7946    alive    wordpress

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/** MySQL hostname */
define('DB_HOST', exec("/usr/bin/serf members -tag role=mysql | awk {'print $2'} | cut -d':' -f1"));

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$ curl --location http://$(docker port $WORDPRESS_ID 80)/

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$ WORDPRESS_ID=$(docker run -d --name wordpress --link serf_1:serf_1 -e="DB_PASSWORD=$DB_PASSWORD" -p 80 ctlc/wordpress-serf /run.sh)
$ serf members
packer-virtualbox    10.0.2.15:7946    alive    
b62e43c286c8    172.17.0.76:7946    alive    serf-agent
356dc2b8c86c    172.17.0.77:7946    alive    mysql
56b4d5f7580d    172.17.0.78:7946    alive    wordpress

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$ MYSQL_ID=$(docker run -d --name mysql --link serf_1:serf_1 -p 3306 ctlc/mysql-serf /run.sh)
$ docker logs $MYSQL_ID
========================================================================
You can now connect to this MySQL Server using:

    mysql -uadmin -p8gmn0Pc7cWJt -h -P

Please remember to change the above password as soon as possible!
MySQL user 'root' has no password but only allows local connections
========================================================================

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$ serf join $(docker port $SERF_ID 7946)
Successfully joined cluster by contacting 1 nodes.
$ serf members
packer-virtualbox    10.0.2.15:7946    alive    
b62e43c286c8    172.17.0.76:7946    alive    serf-agent

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$ wget https://dl.bintray.com/mitchellh/serf/0.5.0_linux_amd64.zip
$ unzip 0.5.0_linux_amd64.zip
$ sudo mv serf /usr/bin/
$ serf agent &
$ serf members
packer-virtualbox    10.0.2.15:7946    alive    

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$ SERF_ID=$(docker run -d --name serf_1 -p 7946 -p 7373 ctlc/serf /run.sh) 

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$ cd ~/coreos-vagrant/cluster/

# find out which box is hosting your port 80
$ etcdctl get /services/web/web_1
{ "host": "core-03", "port": 80, "version": "52c7248a14" }

$ vagrant share core-03 --http 80
==> core-03: Detecting network information for machine...
    core-03: Local machine address: 192.168.65.2
    core-03: Local HTTP port: 80