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namespaces.7: Include manual page references in the summary table of namespace types 

Make the page more compact by removing the stub subsections that
list the manual pages for the namespace types. And while we're
here, add an explanation of the table columns.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2019-10-09 08:59:22 +02:00
parent 4d75df3711
commit ee81d7e418
1 changed files with 36 additions and 58 deletions
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94
man7/namespaces.7
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@ -35,24 +35,45 @@ Changes to the global resource are visible to other processes
that are members of the namespace, but are invisible to other processes.
One use of namespaces is to implement containers.
.PP
Linux provides the following namespaces:
.TS
lB lB lB
l lB l.
Namespace Constant Isolates
Cgroup CLONE_NEWCGROUP Cgroup root directory
IPC CLONE_NEWIPC System V IPC, POSIX message queues
Network CLONE_NEWNET Network devices, stacks, ports, etc.
Mount CLONE_NEWNS Mount points
PID CLONE_NEWPID Process IDs
User CLONE_NEWUSER User and group IDs
UTS CLONE_NEWUTS Hostname and NIS domain name
.TE
.PP
This page describes the various namespaces and the associated
This page provides pointers to information on the various namespace types,
describes the associated
.I /proc
files, and summarizes the APIs for working with namespaces.
.\"
.SS Namespace types
.PP
The following table shows the namespace types available on Linux.
The second column of the table shows the flag value that is used to specify
the namespace type in various APIs.
The third column identifies the manual page that provides details
on the namespace type.
The last column is a summary of the resources that are isolated by
the namespace type.
.TS
lB lB lB lB
l1 lB1 l1 l.
Namespace Flag Page Isolates
Cgroup CLONE_NEWCGROUP \fBcgroup_namespaces\fP(7) Cgroup root directory
IPC CLONE_NEWIPC \fBipc_namespaces\fP(7) T{
System V IPC,
.br
POSIX message queues
T}
Network CLONE_NEWNET \fBnetwork_namespaces\fP(7) T{
Network devices,
.br
stacks, ports, etc.
T}
Mount CLONE_NEWNS \fBmount_namespaces\fP(7) Mount points
PID CLONE_NEWPID \fBpid_namespaces\fP(7) Process IDs
User CLONE_NEWUSER \fBuser_namespaces\fP(7) User and group IDs
UTS CLONE_NEWUTS \fButs_namespaces\fP(7) T{
Hostname and NIS
.br
domain name
T}
.TE
.\"
.\" ==================== The namespaces API ====================
.\"
.SS The namespaces API
@ -319,49 +340,6 @@ for the creator UID in the ancestor namespace is not exceeded.
The aforementioned point ensures that creating a new user namespace
cannot be used as a means to escape the limits in force
in the current user namespace.
.RE
.\"
.\" ==================== Cgroup namespaces ====================
.\"
.SS Cgroup namespaces (CLONE_NEWCGROUP)
See
.BR cgroup_namespaces (7).
.\"
.\" ==================== IPC namespaces ====================
.\"
.SS IPC namespaces (CLONE_NEWIPC)
See
.BR ipc_namespaces (7).
.\"
.\" ==================== Network namespaces ====================
.\"
.SS Network namespaces (CLONE_NEWNET)
See
.BR network_namespaces (7).
.\"
.\" ==================== Mount namespaces ====================
.\"
.SS Mount namespaces (CLONE_NEWNS)
See
.BR mount_namespaces (7).
.\"
.\" ==================== PID namespaces ====================
.\"
.SS PID namespaces (CLONE_NEWPID)
See
.BR pid_namespaces (7).
.\"
.\" ==================== User namespaces ====================
.\"
.SS User namespaces (CLONE_NEWUSER)
See
.BR user_namespaces (7).
.\"
.\" ==================== UTS namespaces ====================
.\"
.SS UTS namespaces (CLONE_NEWUTS)
See
.BR uts_namespaces (7).
.\"
.SS Namespace lifetime
Absent any other factors,