x2c3z4

#include <time.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>

int main(int argc, char *argv[])
{
    struct timespec         cur;
    struct timespec         prev;
    unsigned int            ticks;

x2c3z4

docker ps -q | xargs docker kill
stop docker
cd /var/lib/docker/devicemapper/mnt
umount ./*
mv /var/lib/docker $dest
ln -s $dest /var/lib/docker
start docker

x2c3z4

#!/bin/bash

# https://cloud.google.com/compute/docs/faq#ipranges

#nslookup -q=TXT _cloud-netblocks.googleusercontent.com  8.8.8.8

for LINE in `dig txt _cloud-netblocks.googleusercontent.com +short | tr " " "\n" | grep include | cut -f 2 -d :`
do
	dig txt $LINE +short
done | tr " " "\n" | grep ip4  | cut -f 2 -d : | sort -n

x2c3z4

#!/bin/sh
iptables -t nat -F
#create a new chain named SHADOWSOCKS
iptables -t nat -N SHADOWSOCKS

ips=(google.com www.google.com www.google.com.hk 74.125.203.0/24 64.233.188.0/24 114.134.80.0/24 64.18.0.0/20 64.233.160.0/19 66.102.0.0/20 66.249.80.0/20 72.14.192.0/18 74.125.0.0/16 108.177.8.0/21 173.194.0.0/16 207.126.144.0/20 209.85.128.0/17 216.58.192.0/19 216.239.32.0/19)
for ip in "${ips[@]}";do
	iptables -t nat -A SHADOWSOCKS -p tcp -d $ip -j REDIRECT --to-ports 1081
done

x2c3z4

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm
yum --enablerepo=elrepo-kernel install kernel-ml


sudo bash -c 'echo "net.core.default_qdisc=fq" >> /etc/sysctl.conf'
sudo bash -c 'echo "net.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf'
sysctl -p
lsmod | grep bbr

x2c3z4

一般查找域名对应的IP，可以用这个命令 nslookup <域名>，但这样找，返回的ip比较少，今天看到一条命令，可以批量查找Google当前的IP范围。

命令及返回的结果如下：

# nslookup -q=TXT _netblocks.google.com 8.8.8.8
Server:         8.8.8.8
Address:        8.8.8.8#53

Non-authoritative answer:
_netblocks.google.com   text = "v=spf1 ip4:64.18.0.0/20 ip4:64.233.160.0/19 ip4:66.102.0.0/20 ip4:66.249.80.0/20 ip4:72.14.192.0/18 ip4:74.125.0.0/16 ip4:108.177.8.0/21 ip4:173.194.0.0/16 ip4:207.126.144.0/20 ip4:209.85.128.0/17 ip4:216.58.192.0/19 ip4:216.239.32.0/19 ~all"

x2c3z4

[root]
   path = /root
   writable = yes
   read only = no
   create mask = 0644
   directory mask = 0755
   write list = root

x2c3z4

#include <execinfo.h>	// for backtrace
#include <dlfcn.h>		// for dladdr
#include <cxxabi.h>		// for __cxa_demangle

#include <cstdio>
#include <cstdlib>
#include <string>
#include <sstream>

// This function produces a stack backtrace with demangled function & method names.

x2c3z4

vnc4server -geometry 1920x1080 -geometry 800x600
#Xvnc4

x2c3z4

fio --name=test --ioengine=libaio --iodepth=128 --rw=rw --bs=4k --direct=1 --size=20g --numjobs=1 --filename=/dev/vdb --runtime 100 --time_based --thread=1
[global]
invalidate=1
direct=1
group_reporting=1
ramp_time=5
exitall=1
loops=1
log_avg_msec=5000
ioengine=libaio