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Improving load balancer performance

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IPVS module used for swarm load balancer had a performance issue
under a high load situation. conn_reuse_mode=0 sysctl variable can
be set to handle the high load situation by reusing existing
connection entries in the IPVS table.

Under a high load, IPVS module was dropping tcp SYN packets whenever
a port reuse is detected with a connection in TIME_WAIT status forcing
clients to re-initiate tcp connections after request timeout events.
By setting conn_reuse_mode=0, IPVS module avoids special handling of
existing entries in the IPVS connection table.
Along with expire_nodest_conn=1, swarm load balancer can handle
a high load of requests and forward connections to newly joining
backend services.

Signed-off-by: Andrew Kim <taeyeonkim90@gmail.com>
This commit is contained in:
Andrew Kim 2019-12-16 07:16:40 -08:00
parent 1473794fb5
commit 8899d916c0
1 changed files with 3 additions and 0 deletions
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3
libnetwork/osl/namespace_linux.go
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@ -38,6 +38,9 @@ var (
gpmChan = make(chan chan struct{})
prefix = defaultPrefix
loadBalancerConfig = map[string]*kernel.OSValue{
// disables any special handling on port reuse of existing IPVS connection table entries
// more info: https://github.com/torvalds/linux/blob/master/Documentation/networking/ipvs-sysctl.txt#L25:1
"net.ipv4.vs.conn_reuse_mode": {Value: "0", CheckFn: nil},
// expires connection from the IPVS connection table when the backend is not available
// more info: https://github.com/torvalds/linux/blob/master/Documentation/networking/ipvs-sysctl.txt#L126:1
"net.ipv4.vs.expire_nodest_conn": {Value: "1", CheckFn: nil},