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[Enterprise SONiC] Syslog Follow

andyyl_chen 陳英倫

August 23, 2024 14:37
Updated

Local syslog
Send out syslog to remote syslog server
Adjust severity level for remote syslog server
Frequently Asked Question
- How to prevent a lot of LLDP logs in syslog.

Tested model & firmware version:

Switch model name:

DCS203 (AS7362-56X)

Edgecore SONiC version:

202006 ~ 202006.4

202012.0 ~ 202012.4

202111.0 ~ 202111.8

Restriction:

By default switch sends out syslog to syslog server with all severity levels.
Before 202012.3 version, SYSLOG trap packet does not contain facility and severity.
After 202012.4 version or later, SYSLOG trap packet contains facility and severity.

Local syslog

Procedure:

This command displays all the currently stored log messages. All the latest processes and corresponding transactions are stored in the "syslog" file. This file is saved in the path /var/log and can be viewed by giving the command sudo cat syslog as this requires root login.

admin@sonic:~$ show logging

Optionally, you can follow the log live as entries are written to it by specifying the -f or --follow flag

admin@sonic:~$ show logging --follow

Send out syslog to remote syslog server

Topology:

Pre-configuration:

Make sure switch IP address and connectivity works well. (refer to [Edgecore SONiC] Management and front port IPv4/IPv6 Address)

Procedure :

Step 1. Add the remote syslog

admin@sonic:~$ sudo config syslog add 192.168.1.1
Syslog server 188.188.99.10 added to configuration
Restarting rsyslog-config service...

To specify the use of the management VRF, please include the '-r' or '--vrf' option

admin@sonic:~$ sudo config syslog add 192.168.1.1 -r mgmt

Adjust severity level for remote syslog server

Topology:

Pre-configuration:

Make sure switch IP address and connectivity works well. (refer to [Edgecore SONiC] Management and front port IPv4/IPv6 Address)
Remote syslog server can get switch's syslog( refer to Send out syslog to remote syslog server)

Procedure:

Step 1. Edit the file /usr/share/sonic/templates/rsyslog.conf.j2

Warning and below. (Level 0 ~ 4)

admin@sonic:~$ sudo vi /usr/share/sonic/templates/rsyslog.conf.j2 
{% for server in SYSLOG_SERVER %}    
*.warning @{{ server }}:514;SONiCFileFormat
{% endfor %}

The 202111 branch contains some modifications. You should apply the changes before 'action'(as in version 202111.0).

Send with using management VRF

*.warning action(type="omfwd" target="{{server}}" port="514" protocol="udp" Template="SONiCFileFormat_RFC3164" Device="eth0")

Send without using management VRF

*.warning @[{{ server }}]:514;SONiCFileFormat_RFC3164

Only warning level. (Only Level 4)

admin@sonic:~$ sudo vi /usr/share/sonic/templates/rsyslog.conf.j2
{% for server in SYSLOG_SERVER %}
*.=warning @{{ server }}:514;SONiCFileFormat
{% endfor %}

All severity levels except warning. (Level 0 ~ 7 except Level 4)

admin@sonic:~$ sudo vi /usr/share/sonic/templates/rsyslog.conf.j2
{% for server in SYSLOG_SERVER %}
*.debug;*.!=warning @{{ server }}:514;SONiCFileFormat
{% endfor %}

Note:

Here's the Severity level by the standard.

Value	Severity	Keyword
0	Emergency	emerg
1	Alert	alert
2	Critical	crit
3	Error	err
4	Warning	warning
5	Notice	notice
6	Informational	info
7	Debug	debug

Step 2: Restart syslog service

admin@sonic:~$ sudo systemctl restart rsyslog-config

Frequently Asked Question

How to prevent a lot of LLDP logs in syslog.

Tested model & firmware version:

Switch model name:
DCS204 (AS7726-32X)
Edgecore SONiC version:
202012.4

Problem description:

There are a lot of log LLDP logs in syslog.

Solution:

Users could separate the LLDP log from "/var/log/syslog" to "/var/log/lldp.log".

Step 1: Please add the configuration in "/etc/rsyslog.d/00-sonic.conf".

## LLDP rules
if $programname contains "lldp#" then {
   /var/log/lldp.log
   stop
}

Step 2: Reboot the switch to activate the setting.

Result:

Comments

1 comment

Ben Chen

February 08, 2022 02:50
```
*.debug;*.!=warning @{{ server }}:514;SONiCFileFormat
```
Facility.Servity; Facility.Servity
0

Comment actions Permalink

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Category

[Enterprise SONiC] Syslog Follow

Tested model & firmware version:

Restriction:

Local syslog

Procedure:

Send out syslog to remote syslog server

Topology:

Pre-configuration:

Procedure :

Adjust severity level for remote syslog server

Topology:

Pre-configuration:

Procedure:

Frequently Asked Question

How to prevent a lot of LLDP logs in syslog.

Comments

Articles in this section

Edgecore Networks Corporation

END USER LICENSE AGREEMENT

1) Trademarks:

2) License grant:

3) Open Source Software:

4) Ownership and Copyright:

5) Unauthorized Use:

6) No Warranties:

7) Limited Liability:

8) Compliance with laws:

9) Termination:

10) Governing Law and Jurisdiction:

11) General:

Category

Tested model & firmware version:

Restriction:

Local syslog

Procedure:

Send out syslog to remote syslog server

Topology:

Pre-configuration:

Procedure :

Adjust severity level for remote syslog server

Topology:

Pre-configuration:

Procedure:

Frequently Asked Question

How to prevent a lot of LLDP logs in syslog.

Related articles

Articles in this section