mirror of https://github.com/kubernetes/kops.git
133 lines
3.6 KiB
Go
133 lines
3.6 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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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 model
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import (
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"strings"
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"k8s.io/kops/pkg/apis/kops"
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"k8s.io/kops/upup/pkg/fi"
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"k8s.io/kops/upup/pkg/fi/nodeup/nodetasks"
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)
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// SysctlBuilder set up our sysctls
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type SysctlBuilder struct {
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*NodeupModelContext
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}
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var _ fi.ModelBuilder = &SysctlBuilder{}
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// Build is responsible for configuring sysctl settings
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func (b *SysctlBuilder) Build(c *fi.ModelBuilderContext) error {
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var sysctls []string
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// Common settings
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{
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sysctls = append(sysctls,
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"# Kubernetes Settings",
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"")
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// A higher vm.max_map_count is great for elasticsearch, mongo, or other mmap users
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// See https://github.com/kubernetes/kops/issues/1340
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sysctls = append(sysctls, "vm.max_map_count = 262144",
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"")
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// See https://github.com/kubernetes/kubernetes/pull/38001
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sysctls = append(sysctls,
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"kernel.softlockup_panic = 1",
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"kernel.softlockup_all_cpu_backtrace = 1",
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"")
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// See https://github.com/kubernetes/kube-deploy/issues/261
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sysctls = append(sysctls,
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"# Increase the number of connections",
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"net.core.somaxconn = 32768",
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"",
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"# Maximum Socket Receive Buffer",
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"net.core.rmem_max = 16777216",
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"",
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"# Default Socket Send Buffer",
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"net.core.wmem_max = 16777216",
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"",
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"# Increase the maximum total buffer-space allocatable",
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"net.ipv4.tcp_wmem = 4096 12582912 16777216",
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"net.ipv4.tcp_rmem = 4096 12582912 16777216",
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"",
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"# Increase the number of outstanding syn requests allowed",
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"net.ipv4.tcp_max_syn_backlog = 8096",
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"",
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"# For persistent HTTP connections",
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"net.ipv4.tcp_slow_start_after_idle = 0",
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"",
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"# Increase the tcp-time-wait buckets pool size to prevent simple DOS attacks",
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"net.ipv4.tcp_tw_reuse = 1",
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"",
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// We can't change the local_port_range without changing the NodePort range
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//"# Allowed local port range",
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//"net.ipv4.ip_local_port_range = 10240 65535",
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//"",
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"# Max number of packets that can be queued on interface input",
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"# If kernel is receiving packets faster than can be processed",
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"# this queue increases",
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"net.core.netdev_max_backlog = 16384",
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"",
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"# Increase size of file handles and inode cache",
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"fs.file-max = 2097152",
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"",
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"# Max number of inotify instances and watches for a user",
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"# Since dockerd runs as a single user, the default instances value of 128 per user is too low",
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"# e.g. uses of inotify: nginx ingress controller, kubectl logs -f",
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"fs.inotify.max_user_instances = 8192",
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"fs.inotify.max_user_watches = 524288",
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"",
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)
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}
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if b.Cluster.Spec.CloudProvider == string(kops.CloudProviderAWS) {
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sysctls = append(sysctls,
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"# AWS settings",
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"",
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"# Issue #23395",
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"net.ipv4.neigh.default.gc_thresh1=0",
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"")
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}
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sysctls = append(sysctls,
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"# Prevent docker from changing iptables: https://github.com/kubernetes/kubernetes/issues/40182",
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"net.ipv4.ip_forward=1",
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"")
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c.AddTask(&nodetasks.File{
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Path: "/etc/sysctl.d/99-k8s-general.conf",
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Contents: fi.NewStringResource(strings.Join(sysctls, "\n")),
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Type: nodetasks.FileType_File,
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OnChangeExecute: [][]string{{"sysctl", "--system"}},
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})
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return nil
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}
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