Linux cli command ipc_namespaces

➡ A Linux man page (short for manual page) is a form of software documentation found on Linux and Unix-like operating systems. This man-page explains the command ipc_namespaces and provides detailed information about the command ipc_namespaces, system calls, library functions, and other aspects of the system, including usage, options, and examples of _. You can access this man page by typing man followed by the ipc_namespaces.

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NAME 🖥️ ipc_namespaces 🖥️

overview of Linux IPC namespaces

DESCRIPTION

IPC namespaces isolate certain IPC resources, namely, System V IPC objects (see sysvipc(7)) and (since Linux 2.6.30) POSIX message queues (see mq_overview(7)). The common characteristic of these IPC mechanisms is that IPC objects are identified by mechanisms other than filesystem pathnames.

Each IPC namespace has its own set of System V IPC identifiers and its own POSIX message queue filesystem. Objects created in an IPC namespace are visible to all other processes that are members of that namespace, but are not visible to processes in other IPC namespaces.

The following /proc interfaces are distinct in each IPC namespace:

  • The POSIX message queue interfaces in /proc/sys/fs/mqueue.

  • The System V IPC interfaces in /proc/sys/kernel, namely: msgmax, msgmnb, msgmni, sem, shmall, shmmax, shmmni, and shm_rmid_forced.

  • The System V IPC interfaces in /proc/sysvipc.

When an IPC namespace is destroyed (i.e., when the last process that is a member of the namespace terminates), all IPC objects in the namespace are automatically destroyed.

Use of IPC namespaces requires a kernel that is configured with the CONFIG_IPC_NS option.

SEE ALSO

nsenter(1), unshare(1), clone(2), setns(2), unshare(2), mq_overview(7), namespaces(7), sysvipc(7)

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