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System Administration Guide: Advanced Administration     Oracle Solaris 10 8/11 Information Library
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Document Information

About This Book

1.  Managing Terminals and Modems (Overview)

2.  Setting Up Terminals and Modems (Tasks)

3.  Managing Serial Ports With the Service Access Facility (Tasks)

4.  Managing System Resources (Overview)

5.  Displaying and Changing System Information (Tasks)

6.  Managing Disk Use (Tasks)

7.  Managing UFS Quotas (Tasks)

8.  Scheduling System Tasks (Tasks)

9.  Managing System Accounting (Tasks)

10.  System Accounting (Reference)

11.  Managing System Performance (Overview)

12.  Managing System Processes (Tasks)

13.  Monitoring System Performance (Tasks)

14.  Troubleshooting Software Problems (Overview)

15.  Managing System Messages

Viewing System Messages

How to View System Messages

System Log Rotation

Customizing System Message Logging

How to Customize System Message Logging

Enabling Remote Console Messaging

Using Auxiliary Console Messaging During Run Level Transitions

Using the consadm Command During an Interactive Login Session

How to Enable an Auxiliary (Remote) Console

How to Display a List of Auxiliary Consoles

How to Enable an Auxiliary (Remote) Console Across System Reboots

How to Disable an Auxiliary (Remote) Console

16.  Managing Core Files (Tasks)

17.  Managing System Crash Information (Tasks)

18.  Troubleshooting Miscellaneous Software Problems (Tasks)

19.  Troubleshooting File Access Problems (Tasks)

20.  Resolving UFS File System Inconsistencies (Tasks)

21.  Troubleshooting Software Package Problems (Tasks)


System Log Rotation

System log files are rotated by the logadm command from an entry in the root crontab file. The /usr/lib/newsyslog script is no longer used.

The system log rotation is defined in the /etc/logadm.conf file. This file includes log rotation entries for processes such as syslogd. For example, one entry in the /etc/logadm.conf file specifies that the /var/log/syslog file is rotated weekly unless the file is empty. The most recent syslog file becomes syslog.0, the next most recent becomes syslog.1, and so on. Eight previous syslog log files are kept.

The /etc/logadm.conf file also contains time stamps of when the last log rotation occurred.

You can use the logadm command to customize system logging and to add additional logging in the /etc/logadm.conf file as needed.

For example, to rotate the Apache access and error logs, use the following commands:

# logadm -w /var/apache/logs/access_log -s 100m
# logadm -w /var/apache/logs/error_log -s 10m

In this example, the Apache access_log file is rotated when it reaches 100 MB in size, with a .0, .1, (and so on) suffix, keeping 10 copies of the old access_log file. The error_log is rotated when it reaches 10 MB in size with the same suffixes and number of copies as the access_log file.

The /etc/logadm.conf entries for the preceding Apache log rotation examples look similar to the following:

# cat /etc/logadm.conf
/var/apache/logs/error_log -s 10m
/var/apache/logs/access_log -s 100m

For more information, see logadm(1M).

You can use the logadm command as superuser or by assuming an equivalent role (with Log Management rights). With role-based access control (RBAC), you can grant non-root users the privilege of maintaining log files by providing access to the logadm command.

For example, add the following entry to the /etc/user_attr file to grant user andy the ability to use the logadm command:

andy::::profiles=Log Management

Or, you can set up a role for log management by using the Solaris Management Console. For more information about setting up a role, see Role-Based Access Control (Overview) in System Administration Guide: Security Services.