1、本文主要说明kubernetes集群的准备工作和安装的架构图。
集群架构图：
服务器清单：
2、服务器准备工作
升级内核：
代码语言：javascript复制yum -y install kernel-ml-5.7.8-1.el7.elrepo.x86_64.rpm kernel-ml-devel-5.7.8-1.el7.elrepo.x86_64.rpm
调整默认启动内核
cat /boot/grub2/grub.cfg | grep menuentry
查看是否设置成功
grub2-editenv list
重启服务器reboot3、开启ipvs支持
代码语言：javascript复制cat > /etc/sysconfig/modules/ipvs.modules <<EOF
#!/bin/bash
ipvs_modules="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"
for kernel_module in ${ipvs_modules}; do
/sbin/modinfo -F filename ${kernel_module} > /dev/null 2>&1
if [ $? -eq 0 ]; then
/sbin/modprobe ${kernel_module}
fi
done
EOF
chmod 755 /etc/sysconfig/modules/ipvs.modules
bash /etc/sysconfig/modules/ipvs.modules
lsmod | grep ip_vs关闭防火墙：
代码语言：javascript复制systemctl stop firewalld && systemctl disable firewalld关闭swap分区：
代码语言：javascript复制swapoff -a && sed -i '/ swap / s/^(.*)$/#1/g' /etc/fstab关闭SELinux
代码语言：javascript复制setenforce 0
sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config修改文件句柄数
代码语言：javascript复制vim /etc/security/limits.conf
* soft nofile 65536
* hard nofile 65536
* soft nproc 65536
* hard nproc 65536
* soft memlock unlimited
* hard memlock unlimited修改系统参数
代码语言：javascript复制vim /etc/sysctl.d/k8s.conf
net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp_keepalive_intvl = 30
net.ipv4.tcp_keepalive_probes = 10
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
net.ipv4.neigh.default.gc_stale_time = 120
net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_announce = 2
net.ipv4.ip_forward = 1
net.ipv4.tcp_max_tw_buckets = 5000
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 1024
net.ipv4.tcp_synack_retries = 2
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.netfilter.nf_conntrack_max = 2310720
fs.inotify.max_user_watches=89100
fs.may_detach_mounts = 1
fs.file-max = 52706963
fs.nr_open = 52706963
net.bridge.bridge-nf-call-arptables = 1
vm.swappiness = 0
vm.overcommit_memory=1
vm.panic_on_oom=0
sysctl --system在生产环境建议预留内存,避免内存耗尽导致ssh连不上主机： （32G的机器留2G，251的留3G, 500G的留5G）。下面是预留3G
代码语言：javascript复制echo 'vm.min_free_kbytes=3000000' >> /etc/sysctl.conf
sysctl -phost文件编写：（后面多的事预留的）
代码语言：javascript复制[root@k8s-master1 nginx-web]# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 local-alhost.localdomain localhost6 localhost6.localdomain6
192.168.206.31 k8s-master1
192.168.206.32 k8s-master2
192.168.206.33 k8s-master3
192.168.206.41 k8s-node1
192.168.206.42 k8s-node2
192.168.206.43 k8s-node3
192.168.206.44 k8s-node4
192.168.206.45 k8s-node5
192.168.206.46 k8s-node6
192.168.206.47 k8s-node7
192.168.206.48 k8s-node8
192.168.206.49 k8s-node9服务器时间同步：
代码语言：javascript复制yum -y install ntp ntpdate
ntpdate 0.asia.pool.ntp.org
hwclock --systohc
systemctl enable ntpd
systemctl start ntpd
systemctl status ntpd
