k8s部署之系统初始化(一)

初始化

1.安装依赖包

yum -y install tree lrzsz nmap nc telnet vim wget lsof network-tools bash-completion bash-completion-extras net-tools  epel-release  createrepo  conntrack ntpdate ntp ipvsadm ipset jq iptables curl sysstat libseccomp wget vim net-tools git net-tools

 

2.更新yum

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

 

wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo

 

 

3.设置系统主机名以及 Host 文件的相互解析

vim /etc/hosts

 

192.168.0.156 k8s-master01

192.168.0.45 k8s-node01

192.168.0.44 k8s-node02

 

4.设置防火墙为 Iptables 并设置空规则

systemctl stop firewalld && systemctl disable firewalld

yum -y install iptables-services && systemctl start iptables && systemctl enable iptables && iptables -F && service iptables save

 

5. 关闭SELINUX

#关闭swap分区虚拟内存

swapoff -a && sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab

setenforce 0 && sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/selinux/config

 

6.调整内核参数,对于 K8S

 

cat > kubernetes.conf <<EOF

net.bridge.bridge-nf-call-iptables=1

net.bridge.bridge-nf-call-ip6tables=1

net.ipv4.ip_forward=1

net.ipv4.tcp_tw_recycle=0

vm.swappiness=0 # 禁止使用 swap 空间,只有当系统 OOM 时才允许使用它

vm.overcommit_memory=1 # 不检查物理内存是否够用

vm.panic_on_oom=0 # 开启 OOM

fs.inotify.max_user_instances=8192

fs.inotify.max_user_watches=1048576

fs.file-max=52706963

fs.nr_open=52706963

net.ipv6.conf.all.disable_ipv6=1

net.netfilter.nf_conntrack_max=2310720

EOF

 

cp kubernetes.conf /etc/sysctl.d/kubernetes.conf

sysctl -p /etc/sysctl.d/kubernetes.conf

 

 

 

7.关闭系统不需要服务

 systemctl stop postfix && systemctl disable postfix

 

8. 设置 rsyslogd systemd journald(日志方案改为journald

# 持久化保存日志的目录

mkdir /var/log/journal

mkdir /etc/systemd/journald.conf.d

 

 

cat > /etc/systemd/journald.conf.d/99-prophet.conf <<EOF

[Journal]

# 持久化保存到磁盘

Storage=persistent

 

# 压缩历史日志

Compress=yes

 

SyncIntervalSec=5m

RateLimitInterval=30s

RateLimitBurst=1000

 

# 最大占用空间 10G

SystemMaxUse=10G

 

# 单日志文件最大 200M

SystemMaxFileSize=200M

 

# 日志保存时间 2 周

MaxRetentionSec=2week

 

# 不将日志转发到 syslog

ForwardToSyslog=no

EOF

 

systemctl restart systemd-journald

 

 

9. 升级系统内核为4.44

 

内核软件包地址备用:

https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/linux-4.4.189.tar.gz

 

CentOS 7.x 系统自带的 3.10.x 内核存在一些 Bugs,导致运行的 DockerKubernetes 不稳定,例如: rpm -Uvh  http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm

 

 

rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm

yum --enablerepo=elrepo-kernel install -y kernel-lt

 

#查看都有哪些内核

awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg

 

grub2-set-default 'CentOS Linux (4.4.217-1.el7.elrepo.x86_64) 7 (Core)'



 
#重启主机
reboot

 
#查看内核
uname -r

本文章为我自己的学习笔记,难免有些遗漏,欢迎指正。遇事不慌,大隆来帮,也请大家关注我,支持我,谢谢!

 

posted @ 2020-07-29 14:42  亿千万  阅读(665)  评论(0编辑  收藏  举报