Install Dynamsoft License Server on Linux

Example Environment

• CPU: 2 Core
• Memory:2 GB
• Disk Space
  • System: 8 GB
  • Data: 20 GB
• OS:CentOs7.4

Installation

The following shows all the commands and steps required to set up the Dynamsoft License Server

Download the Dynamsoft License Server v2.4.1 installer, or just copy it over to a proper location

cd /a-proper-location
wget https://tst.dynamsoft.com/public/download/dls/2.4.1/dynamsoft_dls-linux_x64-v2.4.1.tar.gz

Unzip and start the Dynamsoft License Server

# Unzip the installer
tar zxvf dynamsoft_dls-linux_x64-v2.4.1.tar.gz
# Set permissions
chmod -R 755 ./dls-linux
# Start the server
cd ./dls-linux
./startup.sh

If you use Ubuntu, to start the server, try the following instead.

# [optional] Install net-tools if it is not available (Ubuntu 20.04 may not come with it)
sudo apt install net-tools
./startup.sh

Check the status to make sure the server is up

ps -ef |grep dynamsoft

Now, if you visit http://127.0.0.1:48080/page/index.html#/ in the browser, you should be able to see the management portal of the Dynamsoft License Server.

You can edit startup.sh to change the listening ports.

Upon the first visit, you will be asked to set an admin password. A few things to note:

1. The default password is empty;
2. The user name is admin and it can not be changed;
3. Currently, there isn’t a way to retrieve the password should it get lost. Therefore, please keep the password secure.

After that, you will land on the home page where you can find the UUID of this DLS .

This UUID is require when activating your licenses.

If you see the above page, DLS is installed correctly and is ready to process requests. In order to better integrate with your original service, and make the service more secure on the Internet, the next step is to configure the network environment - (set up a reverse proxy) - for it with the help of nginx. See Configure Reverse Proxy Using Nginx on how to redirect requests for https://www.yoursite.com/dls/* to https://127.0.0.1:48080/*.

NOTE

1. “proxy” and “https” are only required if you use one of the following products:

   • SDKs for Javascript without a local service (like Dynamsoft BarcodeReader Javascript Edition).
   • SDKs for iOS (unless the user makes an exception for the application). (Reference: https://stackoverflow.com/questions/31254725/transport-security-has-blocked-a-cleartext-http#answer-33712228)

   If “proxy” and “https” are not configured, please use http://ip:port/ in the following steps.

2. For Docker Users

   DLS binds the physical information of a machine. After DLS runs for the first time, you can not change the host machine. Since it is difficult to ensure that a service is deployed on a fixed physical machine on k8s, we do not recommend deploying DLS on k8s.

   Some data in the DLS installation directory requires persistent storage. One way is to use the container like a virtual machine. If docker stop <containerID> was executed, use docker restart <containerID> to restart. Another way is to use volume mounts or bind mounts.

Configuration

With the above steps, DLS will be listening on requests sent to this URL https://www.yoursite.com/dls/. You can set up another DLS on another machine as the standby server just in case the main server is temporarily unavailable due to network and other reasons.

Configure a Standby DLS

For maximum up time, a standby DLS is necessary. Assume you have installed two copies of DLS, the following are the steps to configure them

• Find the file dls.json.sample in the DLS directory, copy and rename it to dls.json

• In the configuration, there are two settings: “serverMode” and “servers”. We only need to change “servers”. It accepts two values, the first specifies the main DLS URL and the second, the standby URL.

  • For the main DLS: "servers": ["self", "https://standby.yoursite.com/dls/"]

  • For the standby DLS: "servers": ["https://www.yoursite.com/dls/", "self"]

NOTE that you need to configure both the main DLS and the standby DLS separately.

Configure Server URLs

In order for the license client to know where to find DLS, the server URLs need to be embedded in the license string.

By default, when you first import a license and create a project, the license string for the project will already contain a server URL which is simply the host of the website. For example, if DLS is being visited like shown in the following image, then the license string will contain server URL as http://127.0.0.1:48080/.

Since the client devices may visit the DLS through a proxy, the automatically detected URL can be incorrect. We can click the button “Set Server URL” and correct it:

Input the actual server URLs and save:

Once saved, all license strings will be updated to contain the server URLs.