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man ip-netns: Notice about loose device when do 'del'

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Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
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Vadim Kochan 2015-03-15 17:49:16 +02:00 committed by Stephen Hemminger
parent 8ce21c6b93
commit ee9b34778c
1 changed files with 22 additions and 3 deletions
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25
man/man8/ip-netns.8
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@ -46,6 +46,9 @@ ip-netns \- process network namespace management
A network namespace is logically another copy of the network stack, A network namespace is logically another copy of the network stack,
with its own routes, firewall rules, and network devices. with its own routes, firewall rules, and network devices.
By default process inherits network namespace from its parent. Initially all
the processes share the same default network namespace from the init process.
By convention a named network namespace is an object at By convention a named network namespace is an object at
.BR "/var/run/netns/" NAME .BR "/var/run/netns/" NAME
that can be opened. The file descriptor resulting from opening that can be opened. The file descriptor resulting from opening
@ -88,14 +91,30 @@ network namespace and assigns NAME.
.sp .sp
If NAME is present in /var/run/netns it is umounted and the mount If NAME is present in /var/run/netns it is umounted and the mount
point is removed. If this is the last user of the network namespace the point is removed. If this is the last user of the network namespace the
network namespace will be freed, otherwise the network namespace network namespace will be freed and all physical devices will be moved to the
persists until it has no more users. ip netns delete may fail if default one, otherwise the network namespace persists until it has no more
the mount point is in use in another mount namespace. users. ip netns delete may fail if the mount point is in use in another mount
namespace.
If If
.B -all .B -all
option was specified then all the network namespace names will be removed. option was specified then all the network namespace names will be removed.
It is possible to lose the physical device when it was moved to netns and
then this netns was deleted with a running process:
$ ip netns add net0
$ ip link set dev eth0 netns net0
$ ip netns exec net0 SOME_PROCESS_IN_BACKGROUND
$ ip netns del net0
and eth0 will appear in the default netns only after SOME_PROCESS_IN_BACKGROUND
will exit or will be killed. To prevent this the processes running in net0
should be killed before deleting the netns:
$ ip netns pids net0 | xargs kill
$ ip netns del net0
.TP .TP
.B ip netns set NAME NETNSID - assign an id to a peer network namespace .B ip netns set NAME NETNSID - assign an id to a peer network namespace
.sp .sp