About
An Unix domain socket is a socket implementation used mostly for internal inter-process communication (same server)
A UNIX domain socket can be secured using the filesystem (i.e., with user or group permissions), but cannot be reached from other machines that might want to share the service.
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Management
Set
For a UNIX domain socket, you must:
- pick a location within your filesystem that the process will be able to access in which the socket will be created where another internal process would be able to connect,
- set file permissions accordingly.
List
With netstat and the -x option of the socket argument
netstat -all -p -x
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags Type State I-Node PID/Program name Path
unix 2 [ ] DGRAM 11270 1/systemd /run/systemd/shutdownd
unix 2 [ ] DGRAM 13344 505/chronyd /var/run/chrony/chronyd.sock
unix 2 [ ACC ] STREAM LISTENING 10585962 30548/master private/rewrite
unix 2 [ ACC ] STREAM LISTENING 12884387 22550/netdata /tmp/netdata-ipc
unix 2 [ ACC ] STREAM LISTENING 10585948 21578/pickup public/pickup
unix 2 [ ACC ] STREAM LISTENING 9057 1/systemd /run/systemd/private
unix 2 [ ACC ] STREAM LISTENING 14946 534/NetworkManager /var/run/NetworkManager/private-dhcp
unix 2 [ ACC ] STREAM LISTENING 10585952 30548/master public/cleanup
unix 2 [ ACC ] STREAM LISTENING 10585965 30548/master private/bounce
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