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Use system's ephemeral port range for port allocation 

Read `/proc/sys/net/ipv4/ip_local_port_range` kernel parameter to obtain
ephemeral port range that now sets the boundaries of port allocator
which finds free host ports for those exported by containers.

Signed-off-by: Michal Minar <miminar@redhat.com>
This commit is contained in:
Michal Minar 2015-01-21 13:40:59 +01:00 committed by Tibor Vass
parent 0be893a352
commit 6098d0f443
1 changed files with 5 additions and 4 deletions
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9
docs/sources/reference/run.md
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@ -651,10 +651,11 @@ developer, the operator has three choices: start the server container
with `-P` or `-p,` or start the client container with `--link`.
If the operator uses `-P` or `-p` then Docker will make the exposed port
accessible on the host and the ports will be available to any client
that can reach the host. When using `-P`, Docker will bind the exposed
ports to a random port on the host between 49153 and 65535. To find the
mapping between the host ports and the exposed ports, use `docker port`.
accessible on the host and the ports will be available to any client that can
reach the host. When using `-P`, Docker will bind the exposed port to a random
port on the host within an *ephemeral port range* defined by
`/proc/sys/net/ipv4/ip_local_port_range`. To find the mapping between the host
ports and the exposed ports, use `docker port`.
If the operator uses `--link` when starting the new client container,
then the client container can access the exposed port via a private