K8S系统环境初始化

/etc/hosts

[root@localhost ~]# cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 172.16.0.192 master1 172.16.0.193 node1

关闭防火墙 \selinux\swap\dnsmasq

systemctl disable --now firewalld systemctl disable --now dnsmasq systemctl disable --now NetworkManager setenforce 0 sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/sysconfig/selinux sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/selinux/config swapoff -a sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab

时间同步

rpm -ivh http://mirrors.wlnmp.com/centos/wlnmp-release-centos.noarch.rpm yum install ntpdate -y ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime echo 'Asia/Shanghai' >/etc/timezone ntpdate time2.aliyun.com # 加入到crontab */5 * * * * /usr/sbin/ntpdate time2.aliyun.com

limit配置

ulimit -SHn 65535 vim /etc/security/limits.conf # 末尾添加如下内容 * soft nofile 655360 * hard nofile 131072 * soft nproc 655350 * hard nproc 655350 * soft memlock unlimited * hard memlock unlimited

yum源修改

curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo yum install -y yum-utils device-mapper-persistent-data lvm2 yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo cat <<EOF > /etc/yum.repos.d/kubernetes.repo [kubernetes] name=Kubernetes baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/ enabled=1 gpgcheck=1 repo_gpgcheck=1 gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg EOF sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo

必备工具安装

yum install wget jq psmisc vim net-tools telnet yum-utils device-mapper-persistent-data lvm2 git -y

升级节点系统并重启

yum update -y --exclude=kernel* && reboot

内核配置

最新内核地址

https://elrepo.org/linux

下载最新内核

cd /root && wget -c https://elrepo.org/linux/kernel/el7/x86_64/RPMS/kernel-ml-5.12.2-1.el7.elrepo.x86_64.rpm && wget -c https://elrepo.org/linux/kernel/el7/x86_64/RPMS/kernel-ml-devel-5.12.2-1.el7.elrepo.x86_64.rpm

安装配置

cd root && yum localinstall -y kernel-ml* grub2-set-default 0 && grub2-mkconfig -o /etc/grub2.cfg grubby --args="user_namespace.enable=1" --update-kernel="$(grubby --default-kernel)"

安装ipvsadm

yum install ipvsadm ipset sysstat conntrack libseccomp -y modprobe -- ip_vs modprobe -- ip_vs_rr modprobe -- ip_vs_wrr modprobe -- ip_vs_sh modprobe -- nf_conntrack vim /etc/modules-load.d/ipvs.conf # 加入以下内容 ip_vs ip_vs_lc ip_vs_wlc ip_vs_rr ip_vs_wrr ip_vs_lblc ip_vs_lblcr ip_vs_dh ip_vs_sh ip_vs_fo ip_vs_nq ip_vs_sed ip_vs_ftp ip_vs_sh nf_conntrack ip_tables ip_set xt_set ipt_set ipt_rpfilter ipt_REJECT ipip systemctl enable --now systemd-modules-load.service

内核参数修改

cat <<EOF > /etc/sysctl.d/k8s.conf net.ipv4.ip_forward = 1 net.bridge.bridge-nf-call-iptables = 1 net.bridge.bridge-nf-call-ip6tables = 1 fs.may_detach_mounts = 1 net.ipv4.conf.all.route_localnet = 1 vm.overcommit_memory=1 vm.panic_on_oom=0 fs.inotify.max_user_watches=89100 fs.file-max=52706963 fs.nr_open=52706963 net.netfilter.nf_conntrack_max=2310720 net.ipv4.tcp_keepalive_time = 600 net.ipv4.tcp_keepalive_probes = 3 net.ipv4.tcp_keepalive_intvl =15 net.ipv4.tcp_max_tw_buckets = 36000 net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_max_orphans = 327680 net.ipv4.tcp_orphan_retries = 3 net.ipv4.tcp_syncookies = 1 net.ipv4.tcp_max_syn_backlog = 16384 net.ipv4.ip_conntrack_max = 65536 net.ipv4.tcp_max_syn_backlog = 16384 net.ipv4.tcp_timestamps = 0 net.core.somaxconn = 16384 EOF sysctl --system

所有节点配置完内核后，重启服务器，保证重启后内核依旧加载reboot

reboot lsmod | grep --color=auto -e ip_vs -e nf_conntrack