snout

sniff bad smell about performance

What is snout

snout is command line tool to collect system metrics and give you some advice about performance

Usage

Download snout with command wget https://snout.oss-cn-beijing.aliyuncs.com/snout,run chmod +x snout and then run snout with sudo

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  snout is tool to improve your system performance
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Usage:
	snout [commands|flags]

The commands & flags are:
	help 				print snout help
	version 			print the version to stdout
	--debug 			switch on debug mode

Examples:
	# start in normal mode
	snout

	# start in debug mode
	snout  --debug

TIME_WAIT DEMO

+--------------------+--------------------------------+----------------------------------------------------------------------------------+
|      SYMPTOM       |          DESCRIPTION           |                                     ADVISES                                      |
+--------------------+--------------------------------+----------------------------------------------------------------------------------+
| TIME_WAIT_TOO_MUCH | tcp connection state           | You can reuse tcp connection by set `keepalive` in http client,set               |
|                    | `TIME_WAIT` is too much,       | `fastcgi_keep_conn` in php-fpm settings                                          |
|                    | current amount is 23           |                                                                                  |
+                    +                                +----------------------------------------------------------------------------------+
|                    |                                | You can accelerate the `TIME_WAIT` connection recycle by sysctl: sysclt -w       |
|                    |                                | net.ipv4.tcp_syncookies = 1;sysclt -w net.ipv4.tcp_tw_reuse = 1;sysclt -w        |
|                    |                                | net.ipv4.tcp_tw_recycle = 1;sysclt -w net.ipv4.tcp_fin_timeout = 30              |
+--------------------+--------------------------------+----------------------------------------------------------------------------------+

Symptom Support

tcp stack analysis
disk usage analysis
inode usage analysis
network ports usage analysis

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