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Monitoring Syslog Server from DCNM-SAN

Cisco DCNM-SAN registers itself as a logging server and receives syslog messages and stores them in separate files for each switch.

With Cisco NX-OS Release 5.0(1a) and later, the DCNM-SAN stores the syslog messages from all the switches in a fabric to a database, and displays only the aggregated syslog information from the web client. This feature can be enabled or disabled. The syslog stored in the database is filtered by a configurable severity level.

Once the DCNM-SAN receives the syslog messages through the syslog receiver, the raw messages are parsed and the flag for persisting the message in the database is checked. The severity carried by this message is checked from the parsed fields, and the syslog messages are sent to the database.

The raw syslog messages are parsed into the following fields: switch time, facility, severity, event, and Vsan Id. The description is stored in the database and filtered by the severity level.

The following fields are added to server.properties:

• syslog.dblog.enable = false

This field is used to turn on the feature for storing the syslog messages into the database. By turning on this flag, the syslog messages are also written into the database.

• syslog.dblog.severity = warnings

This field is used to filter the syslog messages based on the severity. By configuring this property, syslog messages are filtered on the severity level.

System Message Logging

The system message logging software saves the messages in a log file or directs the messages to other devices. This feature has the following capabilities:

• Provides logging information for monitoring and troubleshooting.
• Allows the user to select the types of captured logging information.
• Allows the user to select the destination server to forward the captured logging information.

By default, the switch logs normal but significant system messages to a log file and sends these messages to the system console. You can specify which system messages should be saved based on the type of facility and the severity level. Messages are time-stamped to enhance real-time debugging and management.

You can access the logged system messages using the CLI or by saving them to a correctly configured system message logging server. The switch software saves system messages in a file that can save up to 1200 entries. You can monitor system messages remotely by accessing the switch through Telnet, SSH, the console port, or by viewing the logs on a system message logging server.

SFP Diagnostics

The error message related to SFP failures is written to the syslog. You can listen to the syslog for events related to SFP failures. The values, low or high alarm, and the warning are checked for the following parameters:

• TX Power
• RX Power
• Temperature
• Voltage
• Current

The SFP notification trap indicates the current status of the alarm and warning monitoring parameters for all the sensors based on the digital diagnostic monitoring information. This notification is generated whenever there is a change in the status of at least one of the monitoring parameters of the sensors on the transceiver in an interface.

The CISCO-INTERFACE-XCVR-MONITOR-MIB contains the SFP notification trap information. Refer to the Cisco MDS 9000 Family MIB Quick Reference for more information on this MIB.

Outgoing System Message Logging Server Facilities

All system messages have a logging facility and a level. The logging facility can be thought of as where and the level can be thought of as what .

The single system message logging daemon (syslogd) sends the information based on the configured facility option. If no facility is specified, local7 is the default outgoing facility.

The internal facilities are listed in Table 51-1 and the outgoing logging facilities are listed in Table 51-3.

System Message Logging Servers

Device Manager allows you to view event logs on your local PC as well as those on the switch. For a permanent record of all events that occur on the switch, you should store these messages off the switch. To do this the Cisco MDS 9000 Family switch must be configured to send syslog messages to your local PC and a syslog server must be running on that PC to receive those messages. These messages can be categorized into four classes:

• Hardware—Line card or power supply problems
• Link Incidents—FICON port condition changes
• Accounting—User change events
• Events—All other events

Note You should avoid using PCs that have IP addresses randomly assigned to them by DHCP. The switch continues to use the old IP address unless you manually change it; however, the Device Manager prompts you if it does detect this situation. UNIX workstations have a built-in syslog server. You must have root access (or run the Cisco syslog server as setuid to root) to stop the built-in syslog daemon and start the Cisco syslog server.

System Message Logging Configuration Distribution

You can enable fabric distribution for all Cisco MDS 9000 Family switches in the fabric. When you perform system message logging configurations, and distribution is enabled, that configuration is distributed to all the switches in the fabric.

You automatically acquire a fabric-wide lock when you issue the first configuration command after you enabled distribution in a switch. The system message logging server uses the effective and pending database model to store or commit the commands based on your configuration. When you commit the configuration changes, the effective database is overwritten by the configuration changes in the pending database and all the switches in the fabric receive the same configuration. After making the configuration changes, you can choose to discard the changes by aborting the changes instead of committing them. In either case, the lock is released. See Chapter 13, “Using the CFS Infrastructure” for more information on the CFS application.

Fabric Lock Override

If you have performed a system message logging task and have forgotten to release the lock by either committing or discarding the changes, an administrator can release the lock from any switch in the fabric. If the administrator performs this task, your changes to the pending database are discarded and the fabric lock is released.

Tip The changes are only available in the volatile directory and are subject to being discarded if the switch is restarted.

Task Flow for Configuring System Message Logging

Follow these steps to configure system message logging:

Step 1 Enable or disable message logging.

Step 2 Configure console severity level.

Step 3 Configure monitor severity level.

Step 4 Configure module logging.

Step 5 Configure facility severity levels.

Step 6 Send log files.

Step 7 Configure system message logging servers.

Step 8 Configure system message logging distribution.

Follow these steps to configure system message logging:

Step 1 Enable or disable message logging.

Step 2 Configure monitor severity level.

Step 3 Configure facility severity levels.

Step 4 Send log files.

Step 5 Configure system message logging servers.

Enabling or Disabling Message Logging

You can disable logging to the console or enable logging to a specific Telnet or SSH session.

• When you disable or enable logging to a console session, that state is applied to all future console sessions. If you exit and log in again to a new session, the state is preserved.
• When you enable or disable logging to a Telnet or SSH session, that state is applied only to that session. If you exit and log in again to a new session, the state is not preserved.

To enable or disable the logging state for a Telnet or SSH session, follow these steps:

To enable or disable the logging state for a Telnet or SSH session, follow these steps:

Step 1 Select a switch in the Fabric pane.

Step 2 Expand Events and select SysLog in the Physical Attributes pane.

You see the SysLog information in the Information pane.

Step 3 Click the Switch Logging tab.

You see the switch information.

Step 4 Select a switch in the Information pane.

Step 5 Check (enable) or uncheck (disable) the Console Enable check box.

Step 6 Click the Apply Changes icon.

Configuring Console Severity Level

When logging is enabled for a console session (default), you can configure the severity levels of messages that appear on the console. The default severity for console logging is 2 (critical).

Restrictions

The current critical (default) logging level is maintained if the console baud speed is 9600 baud (default). All attempts to change the console logging level generates an error message. To increase the logging level (above critical), you must change the console baud speed to 38400 baud.

To configure the severity level for the console session, follow these steps:

Configuring Monitor Severity Level

When logging is enabled for a monitor session (default), you can configure the severity levels of messages that appear on the monitor. The default severity for monitor logging is 5 (notifications).

To configure the severity level for a monitor session, follow these steps:

To configure the severity level for a logging facility, follow these steps:

Step 1 Select a switch in the Fabric pane.

Step 2 Expand Events and select SysLog in the Physical Attributes pane.

You see the SysLog information in the Information pane.

Step 3 Click the Switch Logging tab.

You see the switch information.

Step 4 Select a switch in the Information pane.

Step 5 Select a severity level from the Console Severity drop-down list in the row for that switch.

Step 6 Click the Apply Changes icon.

Configuring Module Logging

By default, logging is enabled at level 7 for all modules. You can enable or disable logging for each module at a specified level.

To enable or disable the logging for modules and configure the severity level, follow these steps:

Configuring Facility Severity Levels

To configure the severity level for a logging facility (see Table 51-1 ), follow these steps:

To configure the severity level for a logging facility, follow these steps:

Step 1 Expand Events and select SysLog in the Physical Attributes pane.

In Device Manager, choose Logs > Syslog > Setup and click the Switch Logging tab in the Syslog dialog box.

You see the switch information.

Step 2 Check the check boxes where you want message logging to occur ( ConsoleEnable , TerminalEnable , LineCardEnable ).

Step 3 Choose the message severity threshold from the Console Severity drop-down box for each switch in DCNM-SAN or click the appropriate message severity level radio button in Device Manager.

Step 4 Click the Apply Changes icon in DCNM-SAN, or click Apply in Device Manager to save and apply your changes.

Sending Log Files

By default, the switch logs normal but significant system messages to a log file and sends these messages to the system console. Log messages are not saved across system reboots.The logging messages that are generated may be saved to a log file. You can configure the name of this file and restrict its size as required. The default log file name is messages.

The file name can have up to 80 characters and the file size ranges from 4096 bytes to 4194304 bytes.

Restrictions

The configured log file is saved in the /var/log/external directory. The location of the log file cannot be changed.

To send log messages to a file, follow these steps:

You can rename the log file using the logging logfile command.

The configured log file is saved in the /var/log/external directory. The location of the log file cannot be changed. You can use the show logging logfile and clear logging logfile commands to view and delete the contents of this file. You can use the dir log: command to view logging file statistics. You can use the delete log: command to remove the log file.

You can copy the logfile to a different location using the copy log: command using additional copy syntax.

To send log messages to a file, follow these steps:

Step 1 Select a switch in the Fabric pane.

Step 2 Expand Events and select SysLog in the Physical Attributes pane.

You see the SysLog information in the Information pane.

Step 3 Select a switch in the Information pane.

Step 4 Click the Switch Logging tab.

Step 5 Enter the name of the log file in the LogFile Name column in the row for that switch.

Step 6 Click the Apply Changes icon.

Configuring System Message Logging Servers

You can configure a maximum of three system message logging servers. One of these syslog servers should be DCNM-SAN if you want to view system messages from the Event tab in DCNM-SAN.

To send log messages to a UNIX system message logging server, you must configure the system message logging daemon on a UNIX server. Log in as root, and follow these steps:

Step 1 Add the following line to the /etc/syslog.conf file.

Note Be sure to add five tab characters between local1.debug and /var/log/myfile.log. Refer to entries in the /etc/syslog.conf file for further examples.

The switch sends messages according to the specified facility types and severity levels. The local1 keyword specifies the UNIX logging facility used. The messages from the switch are generated by user processes. The debug keyword specifies the severity level of the condition being logged. You can set UNIX systems to receive all messages from the switch.

Step 2 Create the log file by entering these commands at the UNIX shell prompt:

Step 3 Make sure the system message logging daemon reads the new changes by entering this command:

Note Most tabs in the Information pane for features using CFS are dimmed until you click the CFS tab. The CFS tab shows which switches have CFS enabled and shows the master switch for this feature. Once you click the CFS tab, the other tabs in the Information pane that use CFS are activated.

To configure system message logging server IPv4 addresses, follow these steps:

To configure system message logging server IPv6 addresses, follow these steps:

To configure system message logging servers, follow these steps:

Step 1 Expand Events and select SysLog in the Physical Attributes pane.

Step 2 Click the Servers tab in the Information pane.

In Device Manager, choose Logs > Syslog > Setup and click the Servers tab in the syslog dialog box.

Step 3 Click the Create Row icon in DCNM-SAN, or click Create in Device Manager to add a new syslog server.

Step 4 Enter the name or IP address in dotted decimal notation (for example, 192.168.2.12) of the syslog server in the Name or IP Address field.

Step 5 Set the message severity threshold by clicking the MsgSeverity radio button and set the facility by clicking the Facility radio button.

Step 6 Click the Apply Changes icon in DCNM-SAN, or click Create in Device Manager to save and apply your changes.

Configuring System Message Logging Distribution

To enable fabric distribution for system message logging server configurations, follow these steps:

To commit the system message logging server configuration changes, follow these steps:

To discard the system message logging server configuration changes, follow these steps:

Fabric Lock Override

To use administrative privileges and release a locked system message logging session, use the clear logging session command.

Verifying Syslog Servers from DCNM-SAN Web Server

To verify the syslog servers remotely using DCNM-SAN Web Server, follow these steps:

Step 1 Point your browser at the DCNM-SAN Web Server.

Step 2 Choose Events > Syslog to view the syslog server information for each switch. The columns in the table are sortable.

Displaying System Message Logging Information

To display the system message logging information, perform one of the following tasks:

For detailed information about the fields in the output from these commands, refer to the Cisco MDS 9000 Family Command Reference .

Use the show logging command to display the current system message logging configuration . See Examples 51-1 to 51-10 .

Note When using the show logging command, output is displayed only when the configured logging levels for the switch are different from the default levels.

Example 51-1 Displays Current System Message Logging

Use the show logging nvram command to view the log messages saved in NVRAM. Only log messages with a severity level of critical and below (levels 0, 1, and 2) are saved in NVRAM.

Example 51-2 Displays NVRM Log Contents

Example 51-3 Displays the Log File

Example 51-4 Displays Console Logging Status

Example 51-5 Displays Logging Facility

Example 51-6 Displays Logging Information

Example 51-7 Displays Last Few Lines of a Log File

Example 51-8 Displays Switching Module Logging Status

Example 51-9 Displays Monitor Logging Status

Example 51-10 Displays Server Information

Viewing Logs from DCNM-SAN Web Server

To view system messages remotely using DCNM-SAN Web Server, follow these steps:

Step 1 Point your browser at the DCNM-SAN Web Server.

Step 2 Click the Events tab followed by the Details to view the system messages. The columns in the events table are sortable. In addition, you can use the Filter button to limit the scope of messages within the table.

Viewing Logs from Device Manager

You can view system messages from Device Manager if Device Manager is running from the same workstation as DCNM-SAN. Choose Logs > Events > current to view the system messages on Device Manager. The columns in the events table are sortable. In addition, you can use the Find button to locate text within the table.

You can view switch-resident logs even if you have not set up your local syslog server or your local PC is not in the switch's syslog server list. Due to memory constraints, these logs will wrap when they reach a certain size. The switch syslog has two logs: an NVRAM log that holds a limited number of critical and greater messages and a nonpersistent log that contains notice or greater severity messages. Hardware messages are part of these logs.

MIBs