optman’s gists

optman / lsof -p 825

Created August 25, 2016 07:46

	~$ sudo lsof -p 825 \| tail
	dockerd 825 root 12u REG 252,0 432522 56103087 /var/lib/docker/graph/b18d0a2076a121ed25bee8188661264efb4703910ab84c67b1b1ebe12144c15b/.migration-tardata
	dockerd 825 root 13r REG 252,0 695 54133782 /var/lib/docker/aufs/diff/d8851364eca83f2295ccd6e057541f9a3a3b89ffb6f83710339db35c84679c73/usr/share/perl/5.14.2/unicore/lib/Bc/R.pl
	dockerd 825 root 14r REG 252,0 2230 56234092 /var/lib/docker/aufs/diff/b18d0a2076a121ed25bee8188661264efb4703910ab84c67b1b1ebe12144c15b/usr/share/man/man8/ip-address.8.gz
	dockerd 825 root 15r REG 252,0 2222 55314199 /var/lib/docker/aufs/diff/f8e17990ec724fdffcdb350ca60509edc76beb3d877d4d38cbb16e2acaddf491/usr/include/rdma/ib_user_sa.h
	dockerd 825 root 16r REG 252,0 74541 59771445 /var/lib/docker/aufs/diff/2bd180a8c434513f02859665f95a5e412dd9467540abd3d0fb99931b464b3fd7/usr/lib/python2.7/pickletools.py
	dockerd 825 root 17r DIR 252,0 4096

optman / iostat -x

Created August 25, 2016 07:54

	$ iostat -x
	Linux 3.13.0-93-generic (ubuntu) Thursday, August 25, 2016 _x86_64_ (4 CPU)

	avg-cpu: %user %nice %system %iowait %steal %idle
	1.88 0.00 0.48 76.50 0.00 21.14

	Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
	sda 20.30 26.46 128.67 4.47 3439.67 140.19 53.78 9.99 75.03 68.82 253.87 6.47 86.10
	dm-0 0.00 0.00 148.70 30.36 3437.92 140.18 39.97 16.03 89.49 71.80 176.17 4.81 86.07
	dm-1 0.00 0.00 0.13 0.00 0.51 0.00 8.00 0.01 55.88 55.88 0.00 42.59 0.54

optman / picshare.go

Last active October 19, 2016 06:52

simple pic host

optman / conntrack -L

Created November 11, 2016 14:24

netstat-nat /proc/net/ip_conntrack /proc/net/pf_conntrack

	$ sudo conntrack -L \|head
	conntrack v1.4.1 (conntrack-tools): 213 flow entries have been shown.
	tcp 6 404458 ESTABLISHED src=172.18.0.8 dst=172.18.0.5 sport=46900 dport=50051 src=172.18.0.5 dst=172.18.0.8 sport=50051 dport=46900 [ASSURED] mark=0 use=1
	udp 17 179 src=172.18.0.6 dst=115.54.184.202 sport=9909 dport=9909 src=115.54.184.202 dst=192.168.1.15 sport=9909 dport=9909 [ASSURED] mark=0 use=1
	udp 17 179 src=172.18.0.6 dst=61.52.121.141 sport=9909 dport=9909 src=61.52.121.141 dst=192.168.1.15 sport=9909 dport=9909 [ASSURED] mark=0 use=1
	udp 17 167 src=172.18.0.6 dst=27.42.189.212 sport=9909 dport=9909 src=27.42.189.212 dst=192.168.1.15 sport=9909 dport=9909 [ASSURED] mark=0 use=1
	udp 17 120 src=172.18.0.6 dst=221.218.229.187 sport=9909 dport=13573 src=221.218.229.187 dst=192.168.1.15 sport=13573 dport=9909 [ASSURED] mark=0 use=1
	...

optman / iotop -oP

Created November 11, 2016 14:28

	Total DISK READ : 214.84 K/s \| Total DISK WRITE : 337.08 K/s
	Actual DISK READ: 214.84 K/s \| Actual DISK WRITE: 848.27 K/s
	PID PRIO USER DISK READ DISK WRITE SWAPIN IO> COMMAND
	152 be/3 root 0.00 B/s 0.00 B/s 0.00 % 94.28 % [jbd2/sda1-8]
	10138 be/4 root 214.84 K/s 0.00 B/s 0.00 % 1.57 % bf_server -rep=/bfp2p/cache -tcp=:9998
	10359 be/4 root 0.00 B/s 337.08 K/s 0.00 % 0.12 % python3 /bfp2p/bin/rpc_server.py -nsqd_addr nsqd:4150

optman / xargs

Last active December 16, 2016 02:57

tail and grep the latest log files

ls *.log -t | head -n 1 | xargs tail -f |grep xxxx

optman / libevent-https.cpp

Last active February 13, 2020 16:21

libevent https demo

	#include <event2/bufferevent_ssl.h>
	#include <event2/bufferevent.h>
	#include <event2/buffer.h>
	#include <event2/event.h>
	#include <event2/dns.h>

	#include <openssl/ssl.h>

	#include <iostream>
	using namespace std;

optman / ws-client.cpp

Last active December 20, 2021 05:06

libevent websocket client test

optman / vlc command line

Created February 4, 2017 10:50

start vlc with rc interface

"C:\Program Files (x86)\VideoLAN\VLC\vlc.exe" --extraintf rc --rc-host 0.0.0.0:999

optman / ngrep

Created February 24, 2017 07:03

ngrep -i "google" -d any -q