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    Centos 7 / RHEL 7 : SSSD couldn't load the configuration database [5]: Input/output error.

    Issue : 

    Cannot start ssd on rhel7 server.

    In /var/log/messages:


    sssd: SSSD couldn't load the configuration database [5]: Input/output error


    Issue Description: 

    In our case, This error comes in a centos 7 server where SSSD sevice can no be started. Following Error comes when starting the Service.



      [root@exampleserver log]# service sssd status
    Redirecting to /bin/systemctl status sssd.service
    ● sssd.service - System Security Services Daemon
       Loaded: loaded (/usr/lib/systemd/system/sssd.service; disabled; vendor preset: disabled)
       Active: failed (Result: exit-code) since Thu 2018-10-04 20:06:41 CEST; 3s ago
      Process: 86361 ExecStart=/usr/sbin/sssd -i ${DEBUG_LOGGER} (code=exited, status=4)
     Main PID: 86361 (code=exited, status=4)

    Oct 04 20:06:41 exampleserver.local systemd[1]: Starting System Security Services Daemon...
    Oct 04 20:06:41 exampleserver.local sssd[86361]: SSSD couldn't load the configuration database [5]: Input/output error.
    Oct 04 20:06:41 exampleserver.local systemd[1]: sssd.service: main process exited, code=exited, status=4/NOPERMISSION
    Oct 04 20:06:41 exampleserver.local systemd[1]: Failed to start System Security Services Daemon.
    Oct 04 20:06:41 exampleserver.local systemd[1]: Unit sssd.service entered failed state.
    Oct 04 20:06:41 exampleserver.local systemd[1]: sssd.service failed.


    Cause:

    The file /var/lib/sss/db/config.ldb provided by the package 'sssd-common' may be missing.
      

    Solution:
    The file /var/lib/sss/*  provided by the package 'sssd-common' may be missing. To Solve this issue we need to follow below steps:

    1. Stop the SSSD Service.
    # systemctl stop sssd
    2. Reinstall the sssd-common package:
    yum reinstall sssd-common
    3. Then Start the SSSD service.
    systemctl start sssd


    For CentOS6:


    1. Stop the SSSD Service.
    # service sssd stop
    2. Reinstall the sssd-common package:
    yum reinstall sssd-common
    3. Then Start the SSSD service.
    service sssd start



     SSSD failed to start with error could not stat file [/etc/resolv.conf]. Error [13:Permission denied]

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