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C++ Programmer, 2024 Electronic Information Graduate
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overview
1. Build apache
2. Install cpolar intranet penetration
3. Public network access configuration
4. Fixed public network address
5. Add a site
Overview
Termux is an Android terminal emulation application, which is used to build a complete Linux environment on Android mobile phones. It can realize many basic operations under Linux, and Termux can run normally without root permissions.
Apache is an open source web server software that is widely used due to its cross-platform and security, and is one of the most popular web server software. We can use Termux to build a web server on an Android phone, and at the same time do intranet penetration, so that users on the public network can also access it, turning Android into a small cloud server.
The following describes how to build an apache service on Android Termux to create a personal site and combine it with the cpolar intranet penetration tool to achieve public network access.
1. Build apache
Execute the command to install apache, the installation is relatively simple, one-click installation
pkg install apache2
Then start apache
apachectl start
When starting up, if the following problems occur
The solution is to modify the configuration file. If vim
is not installed, execute the command to install it
pkg install vim
Edit and modify the configuration file
vim $PREFIX/etc/apache2/httpd.conf
Find ServerName
to untie the comment, change www.example.com
to 127.0.0.1:8080
, you can change the port number to your favorite
Start again after modification, you can
Open the browser, enter http://127.0.0.1:8080
, you can see the apahe welcome page,
stop apache
apachectl stop
restart apache
apachectl restart
2. Install cpolar intranet penetration
cpolar official website: https://www.cpolar.com
After successfully creating an apache container running the site, we then use cpolar to penetrate the internal network to achieve access in the public network environment.
cpolar is a secure intranet penetration cloud service, supports http/https/tcp protocols, can be used permanently for free without restricting traffic, and supports port 80/443 mapping. It can expose local services to the public network by creating a secure tunnel, so that public network users can also access intranet services normally, without the need for a public network IP or setting up a router.
Create a sources.list.d
folder:
mkdir -p $PREFIX/etc/apt/sources.list.d
Add cpolar to download source files
echo "deb [trusted=yes] http://termux.cpolar.com termux extras" >> $PREFIX/etc/apt/sources.list.d/cpolar.list
update warehouse
pkg update
install cpolar
pkg install cpolar
Install termux service
Note: After the installation is complete, remember to close and restart termux to take effect!!
pkg install termux-services
After restarting termux, then start cpolar
sv up cpolar
Set up autostart
sv-enable cpolar
This is to stop the cpola service
sv down cpolar
cpolar.yml main configuration file path location
$PREFIX/etc/cpolar/cpolar.yml
Then enter http://localhost:9200
in the mobile browser to see the cpolar management interface, and log in with the email account registered on the cpolar official website
3. Public network access configuration
The mobile browser opens the cpolar web ui management interface, we click the tunnel management on the left dashboard – create a tunnel, because we modify the configuration file on apache to port 8080
(the article is 8080, the specific port number is Your own port prevails), so we need to create an http tunnel pointing to port 8080:
-
Tunnel name: customizable, be careful not to repeat
-
protocol: http
-
Local address: 8080
-
Domain Type: Choose a random domain name
-
Region: Select China VIP
Click Create
After the creation is successful, open the online tunnel list, and you can see the address accessed by the public network. There are two access methods, one is http, the other is https
We use the http method, enter the public network address in the browser, and the access is successful
4. Fixed public network address
Since the above is a free random tunnel, the generated public network address will change randomly within 24 hours. In order to facilitate long-term and stable connection, we can fix this public network address and configure a fixed second-level subdomain name of cpolar [no filing required] , or you can configure to use your own domain name to access, here we take configuring a fixed second-level subdomain name as an example.
You need to upgrade to the basic package or above to support the configuration of second-level subdomains
Log in to the background of the cpolar official website, click Reserved
on the left dashboard, find Reserve the second-level subdomain name
, and reserve a second-level subdomain name for the http tunnel.
-
Region: select server region
-
Name: Fill in the second-level subdomain name you want to reserve (customizable)
-
Description: Remarks, which can be customized
In this example, a second-level subdomain named mywebsitetest
is reserved. After the subdomain name is successfully reserved, we copy the subdomain name, and then we need to configure it in the tunnel.
Log in to the cpolar web ui management interface, click Tunnel Management
on the left dashboard–Tunnel List
, find the tunnel that needs to be configured with a second-level subdomain name, and click edit
Modify the tunnel information and configure the second-level subdomain name into the tunnel:
-
Domain name type: choose
secondary subdomain name
instead -
Sub Domain: Fill in the second-level subdomain we just reserved (in this case
mywebsitetest
)
After modification, click Update
After the tunnel is successfully updated, click Status
on the left dashboard–Online Tunnel List
, and you can see the public network address of the tunnel, which has been updated to a second-level subdomain.
After fixing, we use the fixed public network address, open it in the browser, and you can see the apache default page, so that a fixed public network address access is set up
5. Add a site
The page we visited above is the default page of apache, not the page we want. We can put the page we like on it and enter the apache htdocs folder
cd $PREFIX/share/apache2/default-site/htdocs
Install the download tool wget
pkg install wget
To demonstrate here, we download a test site
wget https://www.cpolar.com/static/downloads/meditation-app-master.tar.gz
Unzip after downloading
tar xzf meditation-app-master.tar.gz
Then we enter our public network address above plus the resource path /meditation-app-master/index.html
on the browser, and we can see our personal site.
Now as long as the tunnel is kept online, public network users can access the web site we built on termux through this fixed public network address.