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+---
+title: "Automatic ports allocation P2PRC"
+summary: Allocating ports to plugins P2PRC 
+date: 2021-10-03
+aliases: ["/P2PRC-Automatic-ports"]
+tags: ["P2PRC","Ports","TCP","Automatic"]
+author: "Akilan Selvacoumar"
+draft: false
+aliases: [//P2PRC-Automatic-ports]
+weight: 2
+---
+
+## Automatic port allocations
+P2PRC would be in-charge to set to the ports to various TCP ports 
+opened. Due to this implementation the plugin being executed is 
+copied to the tmp directory with a unique UUID. 
+```
+Command: ls /tmp
+output: Semantic <UUID>_<Plugin Name> 
+2e6d76c4-0ed1-4b55-9385-79a58d4f0492_p2prc-vscode-browser                
+7b631e08-62ee-4c1c-a2a4-c05857b9aa7d_p2prc-vscode-browser
+```
+Once the copy of the plugin is added to the /tmp directory 
+the site.yml file inside the appropriate yaml is modified 
+with the appropriate ports assigned to the container. 
+
+### Ex: 
+1. Create container called c1 with an automatic generated TCP port 
+   3313 (external) - 3313 (internal)
+2. Assumption of plugin p1 exists. p1 has one server which needs to 
+   be mapped to a free open TCP port in container c1. Below shows 
+   an implementation of a sample site.yml file. 
+```
+---
+- hosts: all
+  tasks:
+    - name: start vscode code server
+      shell: sh server.sh 0.0.0.0:{{index . 0}}
+```
+Notice there is the following {{index . 0}}. {{index . 0}} does not belong to 
+Ansible but rather is a way to mention where to add the external free port 
+of the container. We use the golang [template library](https://pkg.go.dev/text/template) 
+to parse and populate the site.yml with the appropriate open ports. An array of ints 
+which consists of open free ports are sent to the site.yml. 0 in {{index . 0}} refers 
+to the index in the int array passed on. 
+
+After the port is automatically it's ready to run !
+```
+---
+- hosts: all
+  tasks:
+    - name: start vscode code server
+      shell: sh server.sh 0.0.0.0:3313
+```
+
+### Sample plugins implemented: 
+- [VSCode Plugin](https://github.com/Akilan1999/p2prc-vscode-browser)
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