da0ac31182
Add flags to control max connections (set to 256k vs 64k default) and TCP established timeout (set to 1 day vs 5 day default). Flags can be set to 0 to mean "don't change it". This is only set at startup, and not wrapped in a rectifier loop. Tested manually.
49 lines
1.5 KiB
Go
49 lines
1.5 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package app
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import (
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"io/ioutil"
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"strconv"
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"github.com/golang/glog"
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"k8s.io/kubernetes/pkg/util/sysctl"
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)
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type Conntracker interface {
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SetMax(max int) error
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SetTCPEstablishedTimeout(seconds int) error
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}
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type realConntracker struct{}
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func (realConntracker) SetMax(max int) error {
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glog.Infof("Setting nf_conntrack_max to %d", max)
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if err := sysctl.SetSysctl("net/netfilter/nf_conntrack_max", max); err != nil {
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return err
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}
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// TODO: generify this and sysctl to a new sysfs.WriteInt()
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glog.Infof("Setting conntrack hashsize to %d", max/4)
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return ioutil.WriteFile("/sys/module/nf_conntrack/parameters/hashsize", []byte(strconv.Itoa(max/4)), 0640)
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}
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func (realConntracker) SetTCPEstablishedTimeout(seconds int) error {
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glog.Infof("Setting nf_conntrack_tcp_timeout_established to %d", seconds)
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return sysctl.SetSysctl("net/netfilter/nf_conntrack_tcp_timeout_established", seconds)
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}
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