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UNIX Domain Socket (UDS) over TCP communication

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Posted on 3/2/2026 2:03:34 PM | | | |
Requirements: Suppose a program on server A only has UDS listening enabled, what should server B do if it wants to call a program on server A? You can use UNIX Domain Socket (UDS) over TCP to forward a process from server A to server B.

review
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UNIX domain sockets are a mechanism for inter-process communication based on file paths, rather than files on the file system. Even with SFTP or SSHFS, UNIX domain sockets cannot be accessed over the network.

socat uses UNIX domain sockets

Installation commands:
Start the server

First, let's say a server process /tmp/example-server.sock listens for a server called "server-program". /tmp/example-server.sock If you can connect to this socket from another host and access it, then you can say that you have been able to outperform the network by using it as a UNIX domain socket.

If you just want to test it out, you can use socat.
Test call, the command is as follows:
As shown below:



Or connect using the socat command, as shown below:



Use TCP connections

Use the socat command on the host on which the server process is running.
Connect to TCP from the remote host

It listens for the UNIX domain socket of the same name and connects it to the host on which the server process runs.
Use the client on the remote host

Now that everything is ready, let's connect to the server process over the network. If you want to test it out too, you can use socat.

Use OpenSSH

If you have SSH access, there is an easier way. /tmp/example-server.sock First, start the server host (omitted). Use -L on the client host. The command is as follows:
It is now accessible from the client host.




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