Fixes#10387
Without TCP keep-alive set on socket connections to the daemon, any
long-running container with std{out,err,in} attached that doesn't
read/write for a minute or longer will end in ECONNTIMEDOUT (depending
on network settings/OS defaults, etc.), leaving the docker client side
believing it is still waiting on data with no actual underlying socket
connection.
This patch turns on TCP keep-alive for the underlying TCP connection
for both TLS and standard HTTP hijacked daemon connections from the
docker client, with a keep-alive timeout of 30 seconds.
Docker-DCO-1.1-Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com>
Upstream-commit: f73a6b3845a498107cfb22e4d962f0a30870e7c6
Component: engine
9430b451d3