Luci fails to start via init scripts on Red Hat Enterprise Linux 6?

# service luci start
Start luci...                                              [  OK  ]
Point your web browser to https://127.0.0.1:8084 (or equivalent) to access luci

• But when trying to access the url of luci site, its not available.  And luci status reports:
  

  # service luci status
  No PID file /var/run/luci/luci.pid
  

• Red Hat can't change the version of packages provided by EPEL.
• There are no plans for Red Hat to upgrade python-webob to a version compatible with python-repoze-who-friendlyform provided by EPEL
• This is being tracked via Red Hat Bugzilla: BZ#751202

• Downgrade the package version to python-repoze-who-friendlyform-1.0-0.3.b3.el6:
  

  # yum downgrade python-repoze-who-friendlyform-1.0-0.3.b3.el6
  Loaded plugins: product-id, refresh-packagekit, rhnplugin, subscription-manager
  Updating Red Hat repositories.
  Setting up Downgrade Process
  Resolving Dependencies
  --> Running transaction check
  ---> Package python-repoze-who-friendlyform.noarch 0:1.0-0.3.b3.el6 will be a downgrade
  ---> Package python-repoze-who-friendlyform.noarch 0:1.0.8-2.el6 will be erased
  --> Finished Dependency Resolution
  
  Dependencies Resolved
  
  ====================================================================================================================================
   Package                                    Arch               Version                    Repository                           Size
  ====================================================================================================================================
  Downgrading:
   python-repoze-who-friendlyform             noarch             1.0-0.3.b3.el6             rhel-x86_64-server-ha-6              13 k
  
  Transaction Summary
  ====================================================================================================================================
  Downgrade     1 Package(s)
  
  Total download size: 13 k
  Is this ok [y/N]: y
  Downloading Packages:
  python-repoze-who-friendlyform-1.0-0.3.b3.el6.noarch.rpm                                                     |  13 kB     00:00     
  Running rpm_check_debug
  Running Transaction Test
  Transaction Test Succeeded
  Running Transaction
    Installing : python-repoze-who-friendlyform-1.0-0.3.b3.el6.noarch                                                             1/2 
    Cleanup    : python-repoze-who-friendlyform-1.0.8-2.el6.noarch                                                                2/2 
  duration: 225(ms)
  Installed products updated.
  
  Removed:
    python-repoze-who-friendlyform.noarch 0:1.0.8-2.el6                                                                               
  
  Installed:
    python-repoze-who-friendlyform.noarch 0:1.0-0.3.b3.el6                                                                            
  
  Complete!
  

• To prevent this package being accidentally updated again, one of the following two actions can be taken:

  1. Remove the EPEL repository from the system.  This will prevent the system from accessing any EPEL packages which may not be desirable.
  2. Add an "excludes" line to /etc/yum/yum.conf so that the package is ignored by yum when looking for upgrades:
     

     # cat /etc/yum.conf
     [main]
     cachedir=/var/cache/yum/$basearch/$releasever
     keepcache=0
     debuglevel=2
     logfile=/var/log/yum.log
     exactarch=1
     obsoletes=1
     gpgcheck=1
     plugins=1
     installonly_limit=3
     exclude=python-repoze-who-friendlyform
     

• Remove luci and python-repoze-who-friendlyform:
  

  # yum remove luci python-repoze-who-friendlyform
  

• Disable EPEL repository by removing epel-release, by disabling the repository, or just temporarily disabling the repository for this command:

  # yum remove epel-release
  # yum install luci
  or:
  # vi /etc/yum.repos.d/epel.repo    (change all "enabled=1" to "enabled=0")
  # yum install luci
  or:
  # yum install luci --disablerepo=epel
  

• In this case, the python-repoze-info-friendlyform package provided by epel is version 1.0.8-2.el6, whereas the RHEL6 version is 1.0-0.3.b3.el6.  This means yum will believe the epel version is an upgrade and attempt to upgrade it.

1. No such package cannot occur in EPEL as it would collide with base    RHEL 6 package
2. RHEL 6 does not provide python-webob in a sufficient version (0.9.6.1)

pkg_resources.VersionConflict: (WebOb 0.9.6.1 (/usr/lib/python2.6/site-packages), Requirement.parse('WebOb>=0.9.7'))

# service luci start
Start luci... [ OK ]
Point your web browser to https://127.0.0.1:8084 (or equivalent) to access luci
# service luci status
No PID file /var/run/luci/luci.pid

Check versions of luci, python-webob and python-repoze-who-friendlyform:

# rpm -q luci python-webob python-repoze-who-friendlyform
luci-0.23.0-13.el6.x86_64
python-webob-0.9.6.1-3.el6.noarch
python-repoze-who-friendlyform-1.0.8-2.el6.noarch

Check /var/log/luci/luci.log for a backtrace similar to the following:

Traceback (most recent call last):
  File "/usr/bin/paster", line 9, in <module>
    load_entry_point('PasteScript==1.7.3', 'console_scripts', 'paster')()
  File "/usr/lib/python2.6/site-packages/paste/script/command.py", line 84, in run
    invoke(command, command_name, options, args[1:])
  File "/usr/lib/python2.6/site-packages/paste/script/command.py", line 123, in invoke
    exit_code = runner.run(args)
  File "/usr/lib/python2.6/site-packages/paste/script/command.py", line 218, in run
    result = self.command()
  File "/usr/lib/python2.6/site-packages/paste/script/serve.py", line 276, in command
    relative_to=base, global_conf=vars)
  File "/usr/lib/python2.6/site-packages/paste/script/serve.py", line 313, in loadapp
    **kw)
  File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 204, in loadapp
    return loadobj(APP, uri, name=name, **kw)
  File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 224, in loadobj
    global_conf=global_conf)
  File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 248, in loadcontext
    global_conf=global_conf)
  File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 278, in _loadconfig
    return loader.get_context(object_type, name, global_conf)
  File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 409, in get_context
    section)
  File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 431, in _context_from_use
    object_type, name=use, global_conf=global_conf)
  File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 361, in get_context
    global_conf=global_conf)
  File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 248, in loadcontext
    global_conf=global_conf)
  File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 278, in _loadconfig
    return loader.get_context(object_type, name, global_conf)
  File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 409, in get_context
    section)
  File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 431, in _context_from_use
    object_type, name=use, global_conf=global_conf)
  File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 361, in get_context
    global_conf=global_conf)
  File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 248, in loadcontext
    global_conf=global_conf)
  File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 278, in _loadconfig
    return loader.get_context(object_type, name, global_conf)
  File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 409, in get_context
    section)
  File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 431, in _context_from_use
    object_type, name=use, global_conf=global_conf)
  File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 361, in get_context
    global_conf=global_conf)
  File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 248, in loadcontext
    global_conf=global_conf)
  File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 285, in _loadegg
    return loader.get_context(object_type, name, global_conf)
  File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 561, in get_context
    object_type, name=name)
  File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 581, in find_egg_entry_point
    pkg_resources.require(self.spec)
  File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 648, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 550, in resolve
    raise VersionConflict(dist,req) # XXX put more info here
pkg_resources.VersionConflict: (WebOb 0.9.6.1 (/usr/lib/python2.6/site-packages), Requirement.parse('WebOb>=0.9.7'))
Removing PID file /var/run/luci/luci.pid