CentOS 7 – Water's Home

Calling a C Function From Lua

Posted on August 16, 2019 by admin

Prepare So

```
#include <math.h>
```
```
#include <lua.h>
```
```
#include <lauxlib.h>
```
```
#include <lualib.h>
```
```
 
```
```
static int my_sum(lua_State *L){
```
```
    int d1 = luaL_checknumber(L, 1);
```
```
    int d2 = luaL_checknumber(L, 2);
```
```
    lua_pushnumber(L, d1+d2);
```
```
    return 1;
```
```
}
```
```
 
```
```
static int my_info(lua_State *L){
```
```
    lua_pushstring(L, "qinuu");
```
```
    return 1;
```
```
}
```
```
 
```

static const struct luaL_Reg test_lib[] = {

```
    {"my_sum" , my_sum},
```
```
    {"my_info" , my_info},
```
```
    {NULL, NULL}
```
```
};
```
```
 
```
```
int luaopen_test_lib(lua_State *L){
```
```
    //luaL_newlib(L, test_lib); // 5.2
```

    luaL_register(L, "test_lib",test_lib); // lua 5.1

```
    return 1;
```
```
}
```

Test

```
local my_lib = require "test_lib"
```
```
 
```
```
print(type(test_lib))
```
```
 
```
```
print(test_lib.my_sum(23,17))
```
```
 
```
```
print(test_lib.my_info())
```

How to expose a local server behind a NAT or firewall to the internet

Posted on April 3, 2019April 3, 2019 by admin

Download FRP Server & Client

Modify frps.ini

[root@VM_0_5_centos frp_0.25.3_linux_amd64]# cat frps.ini

```
[common]
```
```
bind_port = xxxxxx
```
```
dashboard_port = xxxxxx
```
```
dashboard_user = xxxxxxxxxxxxxxxx
```
```
dashboard_pwd = xxxxxxxxxxxxxxxx
```
```
allow_ports = xxxxx-xxxxx
```
```
token = xxxxxxxxxxxxxxxx
```
```
max_pool_count = 10
```
```
pool_count = 3
```

Start frps

[root@VM_0_5_centos frp_0.25.3_linux_amd64]# ./frps -c ./frps.ini

Modify frpc.ini

```
root@imx6ul7d:~/frp# cat frpc.ini 
```
```
[common]
```
```
server_addr = qinuu.com
```
```
server_port = xxxxxx
```
```
token = xxxxxxxxxxxxxxxx
```
```
[ssh]
```
```
type = tcp
```
```
local_ip = 127.0.0.1
```
```
local_port = 22
```
```
remote_port = xxxxxx
```

Start frpc

root@imx6ul7d:~/frp# ./frpc -c ./frpc.ini

Start a systemd service

[root@VM_0_5_centos frp_0.25.3_linux_amd64]# cat /lib/systemd/system/frps.service
[Unit]
Description=Frp Server Service
After=network.target
 
[Service]
Type=simple
User=nobody
Restart=on-failure
RestartSec=5s
ExecStart=/usr/local/frp/frp_0.25.3_linux_amd64/frps -c /usr/local/frp/frp_0.25.3_linux_amd64/frps.ini
 
[Install]
WantedBy=multi-user.targethis
 
[root@VM_0_5_centos frp_0.25.3_linux_amd64]# systemctl start frps
[root@VM_0_5_centos frp_0.25.3_linux_amd64]# systemctl enable frps
[root@VM_0_5_centos frp_0.25.3_linux_amd64]# systemctl status frps

Node.js C++ Addons

Posted on May 10, 2018 by admin

Install node-gyp

```
npm install -g node-gyp
```

Prepare SourceCode

```
[root@localhost test_nodejs]# ls
```
```
binding.gyp  hello.cc  hello.js
```

hello.cc

```
#include <node.h>
```
```
 
```
```
namespace demo {
```
```
 
```
```
using v8::FunctionCallbackInfo;
```
```
using v8::Isolate;
```
```
using v8::Local;
```
```
using v8::Object;
```
```
using v8::String;
```
```
using v8::Value;
```
```
 
```

void Method(const FunctionCallbackInfo<Value>& args) {

```
  Isolate* isolate = args.GetIsolate();
```

  args.GetReturnValue().Set(String::NewFromUtf8(isolate, "world"));

```
}
```
```
 
```
```
void init(Local<Object> exports) {
```

  NODE_SET_METHOD(exports, "hello", Method);

```
}
```
```
 
```
```
NODE_MODULE(NODE_GYP_MODULE_NAME, init)
```
```
 
```
```
}  // namespace demo
```

hello.js

```
// hello.js
```

const addon = require('./build/Release/addon');

```
 
```
```
console.log(addon.hello());
```
```
// Prints: 'world'
```

binding.gyp

```
{
```
```
  "targets": [
```
```
    {
```
```
      "target_name": "addon",
```
```
      "sources": [ "hello.cc" ]
```
```
    }
```
```
  ]
```
```
}
```

Compile & Test

[root@localhost test_nodejs]# node-gyp configure

```
gyp info it worked if it ends with ok
```
```
gyp info using node-gyp@3.6.2
```

gyp info using node@8.11.1 | linux | x64

```
gyp info spawn /usr/bin/python2
```

gyp info spawn args [ '/usr/local/node-v8.11.1-linux-x64/lib/node_modules/node-gyp/gyp/gyp_main.py',

```
gyp info spawn args   'binding.gyp',
```
```
gyp info spawn args   '-f',
```
```
gyp info spawn args   'make',
```
```
gyp info spawn args   '-I',
```

gyp info spawn args   '/mnt/hgfs/linux_tmp/test_nodejs/build/config.gypi',

```
gyp info spawn args   '-I',
```

gyp info spawn args   '/usr/local/node-v8.11.1-linux-x64/lib/node_modules/node-gyp/addon.gypi',

```
gyp info spawn args   '-I',
```

gyp info spawn args   '/root/.node-gyp/8.11.1/include/node/common.gypi',

gyp info spawn args   '-Dlibrary=shared_library',

gyp info spawn args   '-Dvisibility=default',

gyp info spawn args   '-Dnode_root_dir=/root/.node-gyp/8.11.1',

gyp info spawn args   '-Dnode_gyp_dir=/usr/local/node-v8.11.1-linux-x64/lib/node_modules/node-gyp',

gyp info spawn args   '-Dnode_lib_file=/root/.node-gyp/8.11.1/<(target_arch)/node.lib',

gyp info spawn args   '-Dmodule_root_dir=/mnt/hgfs/linux_tmp/test_nodejs',

gyp info spawn args   '-Dnode_engine=v8',

```
gyp info spawn args   '--depth=.',
```
```
gyp info spawn args   '--no-parallel',
```

gyp info spawn args   '--generator-output',

```
gyp info spawn args   'build',
```

gyp info spawn args   '-Goutput_dir=.' ]

```
gyp info ok 
```
```
[root@localhost test_nodejs]# 
```
```
[root@localhost test_nodejs]# ls
```
```
binding.gyp  build  hello.cc  hello.js
```
```
[root@localhost test_nodejs]# ls build/
```

addon.target.mk  binding.Makefile  config.gypi  Makefile

```
 
```

[root@localhost test_nodejs]# node-gyp build

```
gyp info it worked if it ends with ok
```
```
gyp info using node-gyp@3.6.2
```

gyp info using node@8.11.1 | linux | x64

```
gyp info spawn make
```

gyp info spawn args [ 'BUILDTYPE=Release', '-C', 'build' ]

make: Entering directory `/mnt/hgfs/linux_tmp/test_nodejs/build'

  CXX(target) Release/obj.target/addon/hello.o

  SOLINK_MODULE(target) Release/obj.target/addon.node

```
  COPY Release/addon.node
```

make: Leaving directory `/mnt/hgfs/linux_tmp/test_nodejs/build'

```
gyp info ok 
```
```
 
```
```
[root@localhost test_nodejs]# ls build/
```

addon.target.mk  binding.Makefile  config.gypi  Makefile  Release

[root@localhost test_nodejs]# ls build/Release/

```
addon.node  obj.target
```
```
 
```

[root@localhost test_nodejs]# node hello.js

```
world
```

How to Install Node.js On CentOS 7

Posted on May 10, 2018 by admin

Unpack node.xxx.tar.xxx

cp node-v8.11.1-linux-x64.tar.gz /usr/local/

```
cd /usr/local/
```
```
tar zxvf node-v8.11.1-linux-x64.tar.gz
```

Add Node Path

```
vim /etc/profile
```

export NODE_HOME=/usr/local/node-v8.11.1-linux-x64

```
export PATH=$NODE_HOME/bin:$PATH
```
```
 
```
```
source /etc/profile
```

Cross Compiler Toolchain (arm-linux-gcc 32bit & CentOS 7 64 Bit)

Posted on January 12, 2018 by admin

Install GLIBC & ZLIB

```
yum install glibc.i686 zlib.i686 -y
```

Install GLIBC & ZLIB

tar jxvf arm-linux-fsl-4.6.2-20170721.tar.bz2 -C /

How to Use KVM to Create Virtual Machine

Posted on December 25, 2017 by admin

Configure Firewall

```
systemctl stop firewalld.service
```
```
systemctl disable firewalld.service
```
```
firewall-cmd --state
```
```
 
```

sed -i '/^SELINUX=.*/c SELINUX=disabled' /etc/selinux/config

sed -i 's/^SELINUXTYPE=.*/SELINUXTYPE=disabled/g' /etc/selinux/config

grep --color=auto '^SELINUX' /etc/selinux/config

```
setenforce 0
```

Install KVM & Virt

```
yum install qemu-kvm libvirt -y
```
```
yum install virt-install -y
```

Start Virt Service

systemctl start libvirtd && systemctl enable libvirtd

```
 
```
```
[root@localhost ~]# ifconfig
```

ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500

        inet 192.168.220.202  netmask 255.255.255.0  broadcast 192.168.220.255

        inet6 fe80::c269:7c04:a06b:dce7  prefixlen 64  scopeid 0x20<link>

        ether 00:0c:29:4e:32:2a  txqueuelen 1000  (Ethernet)

        RX packets 3394211  bytes 4731781088 (4.4 GiB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 264816  bytes 35363147 (33.7 MiB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

```
 
```

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536

        inet 127.0.0.1  netmask 255.0.0.0

        inet6 ::1  prefixlen 128  scopeid 0x10<host>

        loop  txqueuelen 1  (Local Loopback)

        RX packets 68  bytes 5920 (5.7 KiB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 68  bytes 5920 (5.7 KiB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

```
 
```

virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500

        inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255

        ether 52:54:00:a5:ea:48  txqueuelen 1000  (Ethernet)

```
        RX packets 0  bytes 0 (0.0 B)
```

        RX errors 0  dropped 0  overruns 0  frame 0

```
        TX packets 0  bytes 0 (0.0 B)
```

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Create Disk

[root@localhost ~]# qemu-img create -f raw /opt/CentOS-7-x86_64.raw 10G

Formatting '/opt/CentOS-7-x86_64.raw', fmt=raw size=10737418240

Upload System ISO

```
[root@localhost ~]# ls /ISO
```
```
CentOS-7-x86_64-DVD-1708.iso
```

Begin Install OS

[root@localhost ~]# virt-install --virt-type kvm --name CentOS-7-x86_64 --ram 1024 --cdrom=/ISO/CentOS-7-x86_64-DVD-1708.iso --disk path=/opt/CentOS-7-x86_64.raw --network network=default --graphics vnc,listen=0.0.0.0 --noautoconsole

```
 
```
```
Starting install...
```

Domain installation still in progress. You can reconnect to

the console to complete the installation process.

Connect With VNC

List Virtual Machine

```
[root@localhost ~]# virsh list --all
```

 Id    Name                           State

----------------------------------------------------

 -     CentOS-7-x86_64                shut off

Start Virtual Machine

[root@localhost ~]# virsh start CentOS-7-x86_64

```
Domain CentOS-7-x86_64 started
```
```
 
```
```
[root@localhost ~]# virsh list --all
```

 Id    Name                           State

----------------------------------------------------

 3     CentOS-7-x86_64                running

Test Virtual Machine

List Virbr

```
[root@localhost ~]# brctl show
```

bridge name     bridge id               STP enabled     interfaces

virbr0          8000.525400a5ea48       yes             virbr0-nic

                                                        vnet0

List br0 Status

```
[root@localhost ~]# vi create-br0.sh
```
```
 
```
```
[root@localhost ~]# cat create-br0.sh
```
```
brctl addbr br0
```
```
brctl addif br0 ens33
```

ip addr del dev ens33 192.168.220.202/24

```
ifconfig br0 192.168.220.202/24 up
```
```
route add default gw 192.168.220.2
```
```
 
```

[root@localhost ~]# chmod +x create-br0.sh

```
[root@localhost ~]# ./create-br0.sh
```

Create br0

[root@localhost network-scripts]# ifconfig

br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500

        inet 192.168.220.202  netmask 255.255.255.0  broadcast 192.168.220.255

        inet6 fe80::20c:29ff:fe4e:322a  prefixlen 64  scopeid 0x20<link>

        ether 00:0c:29:4e:32:2a  txqueuelen 1000  (Ethernet)

        RX packets 144  bytes 12890 (12.5 KiB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 96  bytes 17020 (16.6 KiB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

```
 
```

ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500

        inet6 fe80::c269:7c04:a06b:dce7  prefixlen 64  scopeid 0x20<link>

        ether 00:0c:29:4e:32:2a  txqueuelen 1000  (Ethernet)

        RX packets 3432987  bytes 4745607852 (4.4 GiB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 297978  bytes 44267836 (42.2 MiB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

```
 
```

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536

        inet 127.0.0.1  netmask 255.0.0.0

        inet6 ::1  prefixlen 128  scopeid 0x10<host>

        loop  txqueuelen 1  (Local Loopback)

        RX packets 68  bytes 5920 (5.7 KiB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 68  bytes 5920 (5.7 KiB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

```
 
```

virbr0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500

        inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255

        ether 52:54:00:a5:ea:48  txqueuelen 1000  (Ethernet)

        RX packets 3970  bytes 167470 (163.5 KiB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 4261  bytes 11695250 (11.1 MiB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

```
 
```

vnet0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500

        inet6 fe80::fc54:ff:feaf:a499  prefixlen 64  scopeid 0x20<link>

        ether fe:54:00:af:a4:99  txqueuelen 1000  (Ethernet)

        RX packets 3970  bytes 223050 (217.8 KiB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 5218  bytes 11745246 (11.2 MiB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Vir Edit to Bridge Network

[root@localhost ~]# virsh edit CentOS-7-x86_64

Domain CentOS-7-x86_64 XML configuration edited.

Before Edit

After Edit

Restart Virtual Machine

[root@localhost ~]# virsh shutdown CentOS-7-x86_64

Domain CentOS-7-x86_64 is being shutdown

```
 
```

[root@localhost ~]# virsh start CentOS-7-x86_64

```
Domain CentOS-7-x86_64 started
```

Look at the Virtual Machine IP

How to Secure Tunnels to Localhost

Posted on December 23, 2017 by admin

Install Golang 1.4

tar -C /usr/local -xzf go1.4.3.linux-amd64.tar.gz

```
mkdir $HOME/go
```

echo 'export GOROOT=/usr/local/go'>> ~/.bashrc

echo 'export GOPATH=$HOME/go'>> ~/.bashrc

echo 'export PATH=$PATH:$GOROOT/bin'>> ~/.bashrc

```
source /root/.bashrc
```

Install Git

yum install mercurial git bzr subversion -y

Install Ngrok

```
cd /usr/local/src/
```

git clone https://github.com/inconshreveable/ngrok.git

Generate CERT

```
export NGROK_DOMAIN="qinuu.com"
```
```
 
```
```
cd ngrok/
```
```
openssl genrsa -out rootCA.key 2048
```

openssl req -x509 -new -nodes -key rootCA.key -subj "/CN=$NGROK_DOMAIN" -days 5000 -out rootCA.pem

```
openssl genrsa -out device.key 2048
```

openssl req -new -key device.key -subj "/CN=$NGROK_DOMAIN" -out device.csr

openssl x509 -req -in device.csr -CA rootCA.pem -CAkey rootCA.key -CAcreateserial -out device.crt -days 5000

```
 
```

cp rootCA.pem assets/client/tls/ngrokroot.crt

cp device.crt assets/server/tls/snakeoil.crt

cp device.key assets/server/tls/snakeoil.key

Make Linux Server

```
GOOS=linux GOARCH=amd64
```
```
make release-server release-client
```

Make Windows Client

```
cd /usr/local/go/src
```

GOOS=windows GOARCH=amd64 CGO_ENABLED=0 ./make.bash

```
cd  /usr/local/src/ngrok/
```

GOOS=windows GOARCH=amd64 make release-server release-client

Start Ngrok Service

nohup bin/ngrokd -domain="qinuu.com" -httpAddr=":8080" -httpsAddr=":8443" &

Download Windows Client

```
ls -al bin/windows_amd64/
```

Configure CLient CFG File

Start Windows Client

Good DNS Server

Posted on December 13, 2017 by admin

China DNS

114.114.114.114
114.114.115.115

DNSPOD

119.29.29.29

CNIC

1.2.4.8

GOOGLE

8.8.8.8 8.8.4.4

How to Configure Static IP in VMware NAT Mode

Posted on December 13, 2017 by admin

Just Do It !

[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-ens33

```
TYPE=Ethernet
```
```
PROXY_METHOD=none
```
```
BROWSER_ONLY=no
```
```
BOOTPROTO=static
```
```
DEFROUTE=yes
```
```
IPV4_FAILURE_FATAL=no
```
```
IPV6INIT=yes
```
```
IPV6_AUTOCONF=yes
```
```
IPV6_DEFROUTE=yes
```
```
IPV6_FAILURE_FATAL=no
```
```
IPV6_ADDR_GEN_MODE=stable-privacy
```
```
NAME=ens33
```

UUID=4e333024-b8c8-45e4-baee-e46ece81432c

```
DEVICE=ens33
```
```
ONBOOT=yes
```
```
IPADDR=192.168.220.200
```
```
NETMASK=255.255.255.0
```
```
GATEWAY=192.168.220.2
```
```
DNS1=8.8.8.8
```

Create Local NTP

Posted on December 7, 2017 by admin

Controller node

Install Chrony

[root@localhost ~]# yum install chrony -y

Edit the /etc/chrony.conf file

[root@localntp ~]# diff /etc/chrony.conf /etc/chrony.conf_bak

```
3,7c3,6
```
```
< #server 0.centos.pool.ntp.org iburst
```
```
< #server 1.centos.pool.ntp.org iburst
```
```
< #server 2.centos.pool.ntp.org iburst
```
```
< #server 3.centos.pool.ntp.org iburst
```
```
< server 192.168.220.201 iburst
```
```
---
```
```
> server 0.centos.pool.ntp.org iburst
```
```
> server 1.centos.pool.ntp.org iburst
```
```
> server 2.centos.pool.ntp.org iburst
```
```
> server 3.centos.pool.ntp.org iburst
```
```
28d26
```
```
< allow 192.168.220.0/24
```

Start the NTP service

[root@localhost ~]# systemctl enable chronyd.service

[root@localhost ~]# systemctl start chronyd.service

[root@localhost ~]# systemctl restart chronyd.service

Other nodes

Install Chrony

[root@localhost ~]# yum install chrony -y

Edit the /etc/chrony.conf file

[root@localhost ~]# diff /etc/chrony.conf /etc/chrony.conf_bak

```
3,7c3,6
```
```
< #server 0.centos.pool.ntp.org iburst
```
```
< #server 1.centos.pool.ntp.org iburst
```
```
< #server 2.centos.pool.ntp.org iburst
```
```
< #server 3.centos.pool.ntp.org iburst
```
```
< server 192.168.220.201 iburst
```
```
---
```
```
> server 0.centos.pool.ntp.org iburst
```
```
> server 1.centos.pool.ntp.org iburst
```
```
> server 2.centos.pool.ntp.org iburst
```
```
> server 3.centos.pool.ntp.org iburst
```

Start the NTP service

[root@localhost ~]# systemctl enable chronyd.service

[root@localhost ~]# systemctl start chronyd.service

[root@localhost ~]# systemctl restart chronyd.service

Verify operation

controller node

```
[root@localhost ~]# chronyc sources
```
```
210 Number of sources = 1
```

MS Name/IP address         Stratum Poll Reach LastRx Last sample

===============================================================================

^? localhost.localdomain         0   8     0     -     +0ns[   +0ns] +/-    0ns

other nodes

```
[root@localhost ~]# chronyc sources
```
```
210 Number of sources = 1
```

MS Name/IP address         Stratum Poll Reach LastRx Last sample

===============================================================================

^? 192.168.220.201               0   8     0     -     +0ns[   +0ns] +/-    0ns