- cmssw/cc7:latest : This contain CMSSW CentOS7 build time environment. Used by CMSSW Release and Integration builds.
 - cmssw/slc6:latest : This contain CMSSW SLc6 build time environment. Used by CMSSW Release and Integration builds.
 - cmssw/slc7-installer:latest : Same as cmssw/cc7 but contain only the env needed for installing CMSSW SW.
 - cmssw/cms:rhel7 : This provides CMSSW runtime EL7 environment for grid jobs
 - cmssw/cms:rhel6 : This provides CMSSW runtime EL6 environment for grid jobs