How do I configure netconsole under Red Hat Enterprise Linux?

Solution Verified - Updated

Environment

  • Red Hat Enterprise Linux 5, 6, 7

    • kernel
    • initscripts

  • Red Hat Enterprise Linux 3, 4

    • kernel
    • netdump

Issue

  • How to configure netconsole ?

Resolution

netconsole allows dmesg output to be transmitted via the network through the use of syslog. It implements kernel-level network logging via UDP port 514.

It is necessary to have a syslog server on the network with syslogd listening on port 514/udp. To configure syslogd to listen to port 514/udp and receive messages from the network, configure the /etc/sysconfig/syslog file with the following options:

SYSLOGD_OPTIONS="-m 0 -r -x"

And restart the syslogd daemon for the changes to take effect.

# service syslog restart

To verify that syslogd is listening on 514/udp, enter:

# lsof -nn -p `pidof syslogd` | grep UDP
syslogd 2885 root 13u IPv4 6417 UDP *:syslog

In this case it is listening on UDP *:syslog, where syslog is the port 514/udp as defined in /etc/services.

For RHEL6/7, syslogd package is replaced by rsyslog. This content is not included.This content is not included.https://access.redhat.com/site/solutions/54363

For Red Hat Enterprise Linux 3 and 4

The configuration file of netconsole is /etc/sysconfig/netdump, which is provided by netdump. You need to change the SYSLOGADDR variable in the file /etc/sysconfig/netdump and this variable contains the IP address of the syslogd server.

SYSLOGADDR=192.168.0.1

Then it is necessary to restart the netdump service to make the changes take effect because netconsole is started on the same script as netdump:

# service netdump restart

Make it run on the next reboot:

# chkconfig netdump on
For Red Hat Enterprise Linux 5 and 6

netconsole is configured via the file /etc/sysconfig/netconsole, which is part of the initscripts package. In the file /etc/sysconfig/netconsole, set the variable SYSLOGADDR to the IP address of the syslogd server:

SYSLOGADDR=192.168.0.1

Restart the netconsole service so the changes take effect, and run it on next reboot with the following command:

# service netconsole restart
# chkconfig netconsole on
For Red Hat Enterprise Linux 7

netconsole is configured via the file /etc/sysconfig/netconsole, which is part of the initscripts package. In the file /etc/sysconfig/netconsole, set the variable SYSLOGADDR to the IP address of the syslogd server:

SYSLOGADDR=192.168.0.1

Restart the netconsole service so the changes take effect, and run it on next reboot with the following command:

# systemctl restart netconsole.service
# chkconfig netconsole on

By default, the syslogd server writes the netconsole messages from the client on /var/log/messages or on the file specified in syslog.conf.

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