K8S-基础环境

1.

hostnamectl set-hostname k8s-master01

2.

yum install -y conntrack ntpdate ntp ipvsadm ipset jq iptables curl sysstat libseccomp wgetvimnet-tools git

3.

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

 

4.
关闭虚拟机内存和安全阻止

swapoff -a && sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
setenforce 0 && sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/selinux/config

cat > /etc/hosts << EOF
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.120.101 k8s-master01
192.168.120.102 k8s-master02
192.168.120.103 k8s-master03
EOF

 

cat > /etc/sysctl.d/k8s.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

 

sysctl -p /etc/sysctl.d/k8s.conf

5.调整时区

timedatectl set-timezone Asia/Shanghai
timedatectl set-local-rtc 0
systemctl restart rsyslog
systemctl restart crond

systemctl stop postfix && systemctl disable postfix

6.
关闭系统不需要服务设置 rsyslogd 和 systemd journald

mkdir /var/log/journal # 持久化保存日志的目录
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

Compress=yes

SyncIntervalSec=5m
RateLimitInterval=30s
RateLimitBurst=1000

SystemMaxUse=10G
SystemMaxFileSize=200M
MaxRetentionSec=2week
ForwardToSyslog=no
EOF

 

systemctl restart systemd-journald

7.升级系统内核为 4.44

rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
yum --enablerepo=elrepo-kernel install -y kernel-lt
grub2-set-default "CentOS Linux (4.4.182-1.el7.elrepo.x86_64) 7 (Core)"
yum --enablerepo=elrepo-kernel install kernel-lt-devel-$(uname -r) kernel-lt-headers-$(uname -r)

8.
关闭numa

cp /etc/default/grub{,.bak}
vim /etc/default/grub # 在 GRUB_CMDLINE_LINUX 一行添加 `numa=off` 参数，如下所示：

diff /etc/default/grub.bak /etc/default/grub
6c6< GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos/root rhgb quiet"
---> GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos/root rhgb quiet numa=off"

cp /boot/grub2/grub.cfg{,.bak}
grub2-mkconfig -o /boot/grub2/grub.cfg