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EDR: Cannot Upgrade Server nor Install the Sensor Installer Package on CentOS 6.x

EDR: Cannot Upgrade Server nor Install the Sensor Installer Package on CentOS 6.x


  • EDR Server: All Versions (previously CB Response Server)
  • CentOS: 6.x


  • Using the commands "yum upgrade cb-enterprise" and "yum install cb-linux-sensor-installer" on CentOS 6 from the EDR Application Server gives the error:
    YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
     Eg. Invalid release/repo/arch combination/
    removing mirrorlist with no valid mirrors: /var/cache/yum/x86_64/6/base/mirrorlist.txt
    Error: Cannot find a valid baseurl for repo: base


  • CentOS 6 has reached End of Life for all Maintenance updates.
  • Need to temporarily disable all repos for upgrades and installs and just use the Carbon Black repo.


  1. Open Terminal.
  2. Switch to root user
    #: su root
  3. Run: 
    # yum clean all
  4. Run the Server Upgrade or Sensor Installer Package Setup on the EDR Application Server:
    1. EDR Server Upgrade:
      #: yum update cb-enterprise --disablerepo=* --enablerepo=CarbonBlack
    2. Sensor Installer Package Setup:
      #: yum install cb-linux-sensor-installer --disablerepo=* --enablerepo=CarbonBlack
  5. If the above does not work try to swap vaults by running the command below and attempt upgrade again: 
    sed -i.old -e 's/^mirrorlist/#mirrorlist/g' -e 's/^#baseurl=http:\/\/mirror.centos.org\/centos\/$releasever\//baseurl=http:\/\/vault.centos.org\/centos\/6\//g' /etc/yum.repos.d/CentOS-Base.repo

Additional Notes

  • The parameter, "--disablerepo=*", temporarily disables all repos while the command is run so that the CarbonBlack repo can be used.
    • This does not permanently disable all repos; it is simply a bypass command.
  • If the temporary command is not wanted, but a more permanent command is required then use a different command.
    • This will apply to everything on the Application Server as opposed to simply an individual command.
    • If installing the Linux sensor on the endpoint throws the same YumRepo error then disable the repos permanently.

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