blogng/blog/2015-02-21-syslog-on-mac-os-x-cheat-sheet.markdown

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2017-01-22 21:30:42 +00:00
---
comments: true
date: 2015-02-21 00:41
layout: post
tags: mac, osx, syslog, cheatsheet
title: 'Syslog on Mac OS X: Cheat Sheet'
2017-01-22 21:30:42 +00:00
---
This is a quick cheatsheet to work with [`syslog(1)`](https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man1/syslog.1.html) implementation OS X uses.
`Console.app` provides a nice UI to access logs in mac, you can do some basic filtering and search, but its limited in terms of raw control a terminal gives you.
`/usr/bin/syslog` can be used to both send and receive logs. Alternatively [`logger(1)`](https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man1/logger.1.html) can be used to send logs to syslog.
## Print logs from a specific facilitiy
```bash
# -w: similar to tailf
syslog -k Facility local1 -w
```
## Sending logs
```bash
# -l severity level
syslog -s "message"
```
## Sending logs upstream to another syslog server
Syslog can forward your logs too. The configuration resides in `/etc/syslog.conf`. You can append forwarding rules in this file, format is
```
# Tab separated
Facility.Level @IPADDR:PORT
```
After this reload syslog daemon.
```
sudo launchctl unload /System/Library/LaunchDaemons/com.apple.syslogd.plist
sudo launchctl load /System/Library/LaunchDaemons/com.apple.syslogd.plistp
```
# Extra reading
1. [`asl.conf(5)`](https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man5/asl.conf.5.html) - Configuration file for Apple Syslog Log (A syslog superset apple implements), this is where all the logic to route logs are set
facility.level