Linux Server Hacks (Vol. 2) by William von Hagen, Brian K. Jones
By William von Hagen, Brian K. Jones
O'Reilly's unique Linux Server Hacks gave sysadmins a hundred essential timesavers, information, and recommendations. This new quantity 2 deals a hundred extra: them all stylish, enjoyable, good confirmed, and intensely useful.To commence, there is a complete bankruptcy on authentication in heterogeneous environments, a favourite subject of coauthor invoice von Hagen. you are going to additionally locate up to date collections of pointers on distant connectivity, method companies, garage administration, protection, troubleshooting, functionality optimization, tracking, method rescue, and more.A few of our favorites: spotting rising difficulties in logfiles; booting crippled platforms for analysis; scaling down on restoration requests; utilizing script to coach junior admins; integrating home windows printing with CUPS; synchronizing a number of servers' root environments; utilizing journaling to speed up restarts; utilizing your desktop as a makeshift console. that is only a style. Your favorites may perhaps fluctuate, yet relaxation guaranteed, you will discover lots of them.
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If you've installed OpenLDAP from packages, these scripts may be located on your system in the directory /usr/share/openldap/migration. If you have multiple password, shadow, and group files on different systems that you want to merge into a single LDAP repository, you can copy them all to your LDAP server system, concatenate them, and sort them to produce single files. You can then edit these files so that they have only single entries for each user and group and install them as the master password, shadow, and group files on your server before running the migration scripts.
Local utility to add each of your system administrators to the Kerberos database. local is a Kerberos-aware version of the standard kadmin utility that does not first authenticate to a Kerberos database and is therefore used for bootstrapping Kerberos on a KDC. Entries in the Kerberos database are known as principals. ORG" created 6. ORG" created. local: quit Adding a standard principal enables default authentication by the associated entity. You will eventually need to create a principal for each user that you want to be able to authenticate using Kerberos.
The primary system for granting tickets (which houses the master copy of the Kerberos database) is known as the Kerberos Key Distribution Center (KDC). The timestamps contained within Kerberos tokens (and tickets) can be verified only if the time and date are synchronized across Kerberos clients and servers. Kerberos authentication will fail if client and server clocks become skewed by more than five minutes. You should always run NTP (Network Time Protocol) daemons on all Kerberos clients and servers to guarantee that their clocks remain in sync [Hack #22].