![]() ![]() They cannot be registered with IANA and they are used for automatically allocating ephemeral ports. They can be opened on a system without superuser privileges.ĭynamic or private ports. These ports are assigned by IANA for specific applications (e.g. Only processes with superuser privileges can open a port in this range on a Linux system. Used by system processes to provide standard network services. The following table shows the meaning of different port ranges: Port Range Ports are represented by numbers from 0 to 65535. When started, Apache opens ports (usually 80 or 443) that allow users to access static content or web pages hosted on our Linux system. I see often that the concept of port is not easy to grasp for those who start learning about Linux.Ī port is a communication channel opened on a Linux system when a process starts, ports allow users or programs outside of the Linux system to communicate with it.Īll the examples in this tutorial are based on a common application running on Linux systems, an Apache Web Server. Let’s go for it! What Ports Are Listening on Linux? We will also go through alternatives to netstat like lsof, ss and fuser. You will learn which netstat flags to use to show the port opened by a process on Linux and other tricks that can be very useful to manage a Linux system. You can also see which ports are opened on a Linux system using the lsof, ss and fuser commands. In the netstat output you can also see the port opened by a specific process. The netstat command allows to see the connections from and to our current Linux systems and it provides flags that also show which process a specific connection is related to. How do you find the port of a process running on Linux? This is a very common thing we need to know when we manage applications on Linux, especially if they have been configured by someone else. There is also a prettylist command to have beautified printing of the process list in JSON format using the command line.In this tutorial you will learn how to find the port of a process running on a Linux system. If you need parsable output, you can use PM2’s jlist command to receive the process list in JSON format. Most of the time, this basic information is sufficient to see if all servers run correctly or if there are any issues to solve. The output shows basic information about the running processes like app name and id, the mode ( fork or cluster), status, uptime, memory footprint, etc. ![]() │ App name │ id │ mode │ pid │ status │ restart │ uptime │ memory │ watching │ The list of processes will look like this: $ pm2 list ![]() Pm2 ls|l|status will print the same information als pm2 list and you can use whatever you prefer. To get an overview of the processes currently managed by PM2, you can print out a comprehensive list using the command line utility. The previous article shows how to start app servers with PM2. Start Multiple Apps With A Single Process File (JSON/JS/YAML) Start Node.js App With Increased Memory Limit From JSON Configuration Start Node.js App With Increased Memory Limit From Command Line How to Start Your App With Node.js V8 Arguments ![]()
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