Linux System Administration Recipes: A Problem-Solution Approach

By David Berube, Nick Plante

The task of Linux structures administrator is interrupt-driven and calls for consistent studying in byte-wise chunks. This booklet supplies recommendations to fashionable problems—even a few you could no longer have heard of—such as scripting LDAP, making Mac consumers play great with Linux servers, and backup, safety, and restoration scripts. writer Juliet Kemp takes a large method of scripting utilizing Perl and bash, and all scripts paintings on Debian or purple Hat lineage distributions. Plus, she dispenses knowledge approximately time administration, facing determined colleagues, and the way to prevent reinventing the wheel!
• the way to love LDAP scripting and NFS tuning
• Make Perl serve you: don't be enslaved through Perl
• discover ways to swap, craft, and consider empowered via recipes that vary your lifestyles
<h3>What you’ll learn</h3> • Centralize your community utilizing LDAP and NFS
• communicate the language of other dossier structures
• be aware of while to exploit Perl or while to stay to sed and awk
• deal with safety matters with Perl, bash, and intelligence
• hint errant process calls and misbehaving colleagues
<h3>Who this e-book is for</h3>
approach directors short of quickly succor and counsel whilst interruptions hinder the graceful operating of a community.
<h3>Table of Contents</h3><ol> • Saving your self attempt
• Centralizing Your community: Kerberos, LDAP, and NFS
• tracking and Updating
• Taking Backups and coping with info
• operating with Filesystems
• Securing Your structures
• operating with Apache
• utilizing the Command Line greater
• operating with textual content in records
• issues getting in, issues Going Out
• monitoring Down insects
• coping with Time and other people

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Com Re-create the stash dossier (the dossier generated from the database password) at the slave server: kdb5_util -m stash input the password you used whilst growing the database in your grasp server. commence krb5-kdc at the slave server, and fee the logs for error. to verify that it’s operating, upload the slave access, eliminate the grasp access from /etc/krb5. conf on considered one of your consumers, and money that kdestroy; kinit works. Troubleshooting listed here are a few issues to envision if you happen to get an errors message: “Key desk access now not found”: a. fee the logs. Is localhost getting used rather than hostname? b. if this is the case, edit /etc/hosts adequately. “Key quantity mismatch”: a. evaluate kvno host/server. instance. com and klist -k /etc/krb5. keytab on either servers. b. in the event that they mismatch, you could have to damage and re-create principals. c. during this example, run kdestroy; kinit sooner than making an attempt back to transparent cached key numbers. “Cannot locate KDC”: a. this can be a number get to the bottom of challenge. try this through changing the identify with the IP deal with in /etc/krb5. keytab. b. If this solves the matter, money /etc/hosts for the inaccurate localhost entries. the ultimate step is to run kpropd usually to propagate any alterations in info from the grasp to the slave. this is often frequently performed with a two-line script (dump to dossier and propagate the dossier across), which runs from /etc/crontab with the output directed to /dev/null. the drawback to this can be that once you don’t are looking to get the SUCCEEDED message e-mailed to you each time it propagates effectively, you do need to know approximately it within the occasion of failure. This a bit enhanced script handles that: forty eight obtain at WoweBook. Com CHAPTER 2 ■ CENTRALIZING YOUR community: KERBEROS, LDAP, AND NFS #! /bin/sh # Script to run computerized Kerberos unload & move to slave server DUMPFILE=/etc/krb5kdc/slave_dump_file RESULT=/etc/krb5kdc/slave_dump_result SLAVE=server2. instance. com MAIL=sysadmin@example. com /usr/sbin/kdb5_util unload $DUMPFILE /usr/sbin/kprop -f $DUMPFILE $SLAVE > $RESULT if grep -vq SUCCEEDED $RESULT ; then mail -s "Kerberos replication challenge" $MAIL < $RESULT fi placed this within the /etc/cron. hourly listing. with the intention to run it extra usually, upload a line to /etc/ crontab at no matter what period you wish; you’ll may want to retain the dossier in /etc/cron. d/ hence. 2-10. including a brand new person to LDAP with a Script LDIF is a structure used to make alterations to the LDAP database, and it’s completely attainable so as to add, delete, and adjust documents simply by writing LDIF records and utilizing ldapadd, ldapmodify, and ldapdelete. in truth, occasionally that’s the most suitable choice. notwithstanding, it’s priceless as a way to script these interactions. perl-ldap is a truly precious selection of Perl modules delivering an OO interface to LDAP servers. to put in the Debian/Ubuntu package deal, run this: sudo apt-get set up libnet-ldap-perl otherwise you can set up it from CPAN via working this as root: perl -m CPAN -e "install perl-ldap" the subsequent script will upload a brand new person, with parameters taken from the command line. you would have to authenticate because the LDAP admin consumer prior to operating it in complete (the components that simply seek may still paintings as any user).

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