How to create 50000 tcp connection in single linux machine?

@georgiana.senger 

Creating such a large number of TCP connections on a single Linux machine can be challenging due to system resource limitations. Here's a general approach to achieve it:

1. Increase system limits: Open the /etc/security/limits.conf file and add the following lines: * soft nofile 100000 * hard nofile 100000 Modify the /etc/sysctl.conf file and add the following lines: net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_tw_recycle = 1 net.ipv4.ip_local_port_range = 1024 65000 Apply the changes using the command sudo sysctl -p.
2. Disable reverse DNS lookup: Open the /etc/ssh/sshd_config file and add the following line: UseDNS no Restart the SSH service with the command sudo service sshd restart.
3. Modify TCP configuration: Open the /etc/sysctl.conf file and add the following lines: net.ipv4.tcp_max_syn_backlog = 16384 net.core.somaxconn = 16384 Apply the changes using the command sudo sysctl -p.
4. Writing a script: Use a programming language (e.g., Python, C) to write a script that establishes TCP connections. Use a loop to create and maintain connections. For example, in Python: import socket for _ in range(50000): sock = socket.socket() try: sock.connect(('127.0.0.1',
5. Run the script: Execute the script with appropriate configurations. Monitor system resource usage and adjust the script if necessary.

Note: Creating and maintaining a large number of TCP connections may have implications on system performance and resource availability. Ensure that your system is capable of handling such a high load.

@georgiana.senger 

It is important to note that creating 50000 TCP connections on a single Linux machine can have various implications on system performance and resource utilization. It is essential to carefully consider the impact and ensure that the system has enough resources to handle such a large number of connections.

Here is a general outline of how you may approach creating a high number of TCP connections on a Linux machine:

1. Increase System Limits: Adjust system limits in /etc/security/limits.conf and /etc/sysctl.conf files to allow for a large number of file descriptors and TCP connections.
2. Disable Reverse DNS Lookup: Turning off reverse DNS lookup in the SSH configuration can help reduce latency in establishing connections.
3. Modify TCP Configuration: Fine-tune TCP and networking parameters in /etc/sysctl.conf such as tcp_max_syn_backlog and somaxconn to optimize for a high number of connections.
4. Writing a Script: Utilize a programming language like Python, C, etc. to create a script that can establish and maintain multiple TCP connections concurrently.
5. Testing and Monitoring: Test the script in a controlled environment and monitor system resource utilization to ensure that the machine can handle the load effectively without hitting bottlenecks.
6. Optimizing Script: Optimize the script, handle errors gracefully, and include mechanisms for managing connection timeouts, reconnections, etc.

Remember, creating and managing a large number of TCP connections can be resource-intensive and may affect system stability. It is crucial to assess the system's capabilities and performance under such conditions before proceeding with a large-scale deployment.