Download E-books Automating Linux and Unix System Administration (Expert's Voice in Linux) PDF

The writer focuses completely on how UNIX and Linux method directors can use famous instruments to automate initiatives, even throughout a number of systems.

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Doing Real-Time Log Reporting we are going to make the most of our centralized syslog loghost to alert the SA employees whilst really vital or impressive syslog messages seem. those may be alert messages despatched to a pager approximately DNS server difficulties or complete disks, or they could easily be informational messages despatched to the administrator’s inbox approximately what percentage SSH logins happened that day. the straightforward occasion Correlator (SEC) can do all of that and extra. it really is an open resource application meant to accomplish event-correlation tasks with network-management platforms resembling HP OpenView or Micromuse (now IBM) OMNIbus. SEC permits you to use messages to set a selected nation, and therefore different states, reckoning on extra occasions or the passage of time. At anybody of those country adjustments, SEC can ship electronic mail or execute different instructions, or just drop the present nation. (Visit SEC’s domestic web page at http://www. estpak. ee/~risto/sec/. ) SEC Will simply deal with our easy log-alerting wishes, comparable to e-mailing while it sees a specific occasion. it's going to additionally deal with extra complicated reporting comparable to monitoring the method identifier (PID) of a technique servicing a specific user’s FTP login, recording all log messages from that approach, and at last e-mailing all these occasions while the person logs out. we are going to name SEC at once from syslog-ng at the loghost, by way of piping all messages at once into it. notice that the SEC software itself is found in /usr/bin simply because we put in the Debian SEC package deal at install time (using FAI), and that’s the place Debian areas it. First, We’ll desire a configuration dossier. Let’s position a dossier at PROD/repl/root/usr/pkg/sec/etc/ sec. conf with those contents: The type=single strains execute an motion according to a match-in this example, sending the message to the mail command—and the guideline easily ends there. the kind= SingleWithSuppress line is extra attention-grabbing, in that it’s essentially a throttling mechanism. It makes use of a different key to spot the individuality of the message that it’s throttling. the bottom line is composed of the rule of thumb dossier identify, the guideline identification, and the event-description string derived from the desc parameter of the guideline definition. which means on the way to throttle a message throughout assorted hosts, or throughout a number of messages that may vary in fields except the hostname, you’ll have to manage the desc box which will normalize the major. learn the SEC guy web page for additional information. position a role at PROD/inputs/tasks/app/sec/cf. sync-sec-config with those contents to repeat the SEC configuration listing: upload this activity to the PROD/inputs/hostgroups/cf. sysloghost dossier with this access: Make the syslog host make the most of SEC through including those strains to PROD/repl/root/etc/syslog-ng /syslog-ng. conf sysloghost: Now you’ll get e mail indicators while any of these “bad” messages come via. learn the SEC guy web page to benefit extra approximately What it might do, and think about the numerous instance principles which are disbursed with the package deal from the website. Seeing the sunshine initially of this bankruptcy, We had an infrastructure With many purposes operating in it, similar to mail, cfengine, Apache, DHCP, DNS, and extra, yet We had no visibility into any log messages despatched from any of these purposes.

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