docker コンテナで haproxy 開始時のエラー

Issue

• RHEL7 で docker のコンテナが haproxy を開始するとエラーが発生します。

bash-4.2# haproxy -f /etc/haproxy/haproxy.cfg -d
Available polling systems :
      epoll : pref=300,  test result OK
       poll : pref=200,  test result OK
     select : pref=150,  test result FAILED
Total:3 (2 usable), will use epoll.
Using epoll() as the polling mechanism.
[ALERT] 266/123506 (95) :[haproxy.main()] Cannot chroot(/var/lib/haproxy).
bash-4.2# rpm -qi haproxy
Name        : haproxy
Version     :1.5.2
Release     :2.el7_0
Architecture: x86_64
Install Date:Wed Sep 24 12:22:11 2014
Group       :System Environment/Daemons
Size        :2629589
License     :GPLv2+
Signature   :RSA/SHA256, Thu Aug 14 14:46:35 2014, Key ID 199e2f91fd431d51
Source RPM  : haproxy-1.5.2-2.el7_0.src.rpm
Build Date  :Fri Aug  1 10:31:29 2014
Build Host  : x86-021.build.eng.bos.redhat.com
Relocations :(not relocatable)
Packager    :Red Hat, Inc. <http://bugzilla.redhat.com/bugzilla>
Vendor      :Red Hat, Inc.
URL         : http://haproxy.1wt.eu/
Summary     :HA-Proxy is a TCP/HTTP reverse proxy for high availability environments
Description :
HA-Proxy is a TCP/HTTP reverse proxy which is particularly suited for high
availability environments.Indeed, it can:
- route HTTP requests depending on statically assigned cookies
- spread the load among several servers while assuring server persistence
  through the use of HTTP cookies
- switch to backup servers in the event a main one fails
- accept connections to special ports dedicated to service monitoring
- stop accepting connections without breaking existing ones
- add/modify/delete HTTP headers both ways
- block requests matching a particular pattern
bash-4.2#