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How to enable core dumps on UCS systems
To enable system wide core dumps: Version 4 To analyse segfaults in processes it might be of need to allow them to dump their state into a core file. To enable system wide core dumps you may use the...
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Recreate listener cache
UCS 4 Problem: The univention directory listener fails with I/O errors in the /var/log/univention/listener.log - no further replication is done (see also sdb #1303). The reason is corrupt listener...
View ArticleConfigure SAML Single Sign-On as single server solution
Problem The default UCS Single Sign-On setup consists of an additional DNS Record that is shared between master and backup servers to provide a failsafe setup. That default DNS Record is...
View ArticleSingle Sign On setup failed or Single Sign On link on UMC login page is...
Problem The hyperlink 'Single Sign On' on the Univention Management Console login page is crossed out. It does not take the browser to the single sign-on login page. Solution overview The hyperlink...
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Fail-safe domain setup
UCS 4 Ways to establish a fail-safe domain setup and to increase reliability UCS can be used for single server environments as well as for a domain with hundreds of UCS servers. So, the default...
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How to deal with s4-connector rejects
UCS 4 S4-Connector Rejects Rejects You can use the following command to have a look at the current S4-Connector replication status: univention-s4connector-list-rejected If you see rejected objects...
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Samba 4 Troubleshooting
UCS 4 Samba 4 Troubleshooting Guide DRS Replication samba-tool drs showrepl To get an overview of the current drs replication status you can use this command at every UCS Samba 4 DC which is...
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Re-Provisioning Samba4 on a UCS@school DC Master
UCS 4 This article describes the re-provision of a Samba 4 on a UCS@school DC Master. For a non-UCS@school environment http://sdb.univention.de/1282 should be used. Problem: Several Samba 4 data...
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Re-Provisioning Samba4 on a DC Master
UCS 4 This article describes the re-provision of a Samba 4 DC Master. Please see http://sdb.univention.de/1353 if a UCS@school environment is used. Problem: Several Samba 4 data is either lost or...
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Timeout Änderung für den Univention Directory Manager bzw. für die Univention...
Version 4.x Problem: Standardmäßig beträgt der Timeout für den Univention Directory Manager und für die Univention Management Console 300 Sekunden. Wie kann der Timeout verändert werden?...
View ArticleGRUB Error: "Disk filter writes are not supported in boot"
UCS 4.1 Erratum #82 and UCS 4.0 Erratum #396 added/activated the "savedefault" option by default. This requires GRUB to write to the disk, which is not supported for every type of device (e.g....
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Configure SAML Single Sign-On as single server solution
UCS 4 Problem The default UCS Single Sign-On setup consists of an additional DNS Record that is shared between master and backup servers to provide a failsafe setup. That default DNS Record is...
View ArticleBoot UCS system via Super GRUB2 Disk
UCS uses GRUB2 as bootloader. If the installation of GRUB2 is inconsistent, the UCS system might not boot or GRUB2 shows a rescue shell. In some cases the UCS system can be started by booting the Super...
View ArticleBooting from the wrong device, GRUB displays "symbol...
If GRUB is installed on a different device than the one that the BIOS boots from, the system may still boot as long as the device-installed GRUB is compatible with the OS-installed GRUB.But once they...
View ArticleUpdate of UCS 3.2 UEFI systems to UCS 4.0
With UCS 4.0 the UEFI components of UCS have been updated. After updating UCS 3.2 UEFI systems a number of steps have to be performed as user root to make sure the UCS system remains bootable:A few new...
View ArticleDisable console blanking
By default, the kernel activates a console blanking timeout of 600 seconds. After reaching the timeout, the hardware terminal turns black. In case of a kernel OOPS, important debugging information may...
View ArticleManagement Console Login not possible - Leap Year
It is possible, that the Login in the Management Console is not possible at the 29th of February (that is a "leap day"). In the management-console-log the following traceback appears (solution below):...
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Analyze boot problems
UCS 4 Problem: A system does not boot and seems to freeze at bootsplash. Solution: It is possbile to edit the boot options for the UCS system within GRUB. You can disable the splashscreen and raise...
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Migration of Cyrus 2.4 to Dovecot
UCS 4 Disclaimer Due to the vast variety of mail appliances and differing structures of environments, we recommend to analyze the feasibility of this migration process in your very own environment...
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Migration von Cyrus 2.4 nach Dovecot
UCS 4 Disclaimer Aufgrund der Vielfalt an verschiedenen Mail-Appliances und strukturell unterschiedlichen Umgebungen, geben wir keine Gewähr auf den folgenden Artikel. Wir empfehlen die Migration...
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