kubeadm安装k8s v1.13.1 HA详细教程之一:环境准备
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2022-03-07 13:22:36
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本文首发自个人博客:https://blog.smile13.com/articles/2019/01/13/1547376380025.html
环境准备(所有节点都需要操作)
1.服务器信息
server count: 7
server version: Centos7.4
2.节点规划
192.168.158.131 k8s01 etcd、Master、Node、keepalived
192.168.158.132 k8s02 etcd、Master、Node、keepalived
192.168.158.133 k8s03 etcd、Master、Node、keepalived
192.168.158.134 k8s04 node
192.168.158.135 k8s05 node
192.168.158.136 k8s06 node
192.168.158.137 k8s07 node
192.168.158.138 k8s08 k8s-cluster.smile13.com (VIP)
3.关闭防火墙
sudo systemctl stop firewalld && sudo systemctl disable firewalld
4.关闭Sexlinux
sed -i ‘/SELINUX=enforcing/d’ /etc/selinux/config
sed -i ‘/SELINUX=disabled/d’ /etc/selinux/config
echo “SELINUX=disabled” >> /etc/selinux/config
重启后生效。
5.安装ntp同步时间
# yum -y install ntp 修改配置文件/etc/ntp.conf 注释掉原有的server指向把时间服务器的域名地址指向一个靠谱可连的时间服务器,我选择的是ntp1.aliyun.com. # vi /etc/ntp.conf …… #server 0.centos.pool.ntp.org iburst #server 1.centos.pool.ntp.org iburst #server 2.centos.pool.ntp.org iburst #server 3.centos.pool.ntp.org iburst server ntp1.aliyun.com iburst ...... 启动ntp并加入开机启动 # systemctl start ntpd # systemctl enable ntpd Created symlink from /etc/systemd/system/multi-user.target.wants/ntpd.service to /usr/lib/systemd/system/ntpd.service. 注意:在启动之前,先使用ntpdate手动同步一下时间,免得本机与对时中心时间差距太大,使得ntpd不能正常同步。这里选用ntp1.aliyun.com作为对时中心:sudo ntpdate -u ntp1.aliyun.com
6.配置ssh,实现节点见的无秘密登录
6.1生成**
ssh-****** -t rsa #输入之后一直选择enter即可。生成的秘钥位于 ~/.ssh文件夹下。可用cd 命令进入查看。
6.2 导入authorized_keys
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
6.3 远程无密码登录(把各个主机上的authorized_keys拷贝到其他主机的相应目录下)
cat ~/.ssh/id_rsa.pub | ssh -p 22 [email protected] 'cat >> ~/.ssh/authorized_keys'
6.4 修改authorized_keys文件的权限(必须为600,否则不能免密码登陆)
chmod 600 ~/.ssh/authorized_keys
7.关闭swap
swapoff -a 然后再打开文件/etc/fstab,找到swap有关的一行,如下图红框所示,在这一行的最左边加上"#",将该行注释掉: # # /etc/fstab # Created by anaconda on Fri Jul 20 23:01:49 2018 # # Accessible filesystems, by reference, are maintained under '/dev/disk' # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info # UUID=f5f7670b-9aaf-414c-8e5e-50cb33e81d48 / xfs defaults 0 0 UUID=8ef45b9a-a906-40a9-a51c-af05d3d13766 /boot xfs defaults 0 0 #UUID=26981930-f538-4a6f-a055-6ca7a5a51112 swap swap defaults 0 0 执行free -m命令检查,swap值应该都为0了 [[email protected] ~]# free -m . total used free shared buff/cache available Mem: 29443 181 28985 8 276 28865 Swap: 0 0 0
8.配置ipvs支持
[[email protected] ~]# cat /etc/sysconfig/modules/ipvs.modules #!/bin/bash modprobe -- ip_vs modprobe -- ip_vs_rr modprobe -- ip_vs_wrr modprobe -- ip_vs_sh modprobe -- nf_conntrack_ipv4 上面脚本创建了的/etc/sysconfig/modules/ipvs.modules文件,保证在节点重启后能自动加载所需模块。 查看是否已经正确加载所需的内核模块: [[email protected] ~]# lsmod | grep -e ip_vs -e nf_conntrack_ipv4 nf_conntrack_ipv4 16384 2 nf_defrag_ipv4 16384 1 nf_conntrack_ipv4 ip_vs_sh 16384 0 ip_vs_wrr 16384 0 ip_vs_rr 16384 0 ip_vs 151552 6 ip_vs_rr,ip_vs_sh,ip_vs_wrr nf_conntrack 135168 8 xt_conntrack,nf_nat_masquerade_ipv4,nf_conntrack_ipv4,nf_nat,ipt_MASQUERADE,nf_nat_ipv4,nf_conntrack_netlink,ip_vs libcrc32c 16384 4 nf_conntrack,nf_nat,xfs,ip_vs 接下来还需要确保各个节点上已经安装了ipset软件包yum install ipset。 为了便于查看ipvs的代理规则,最好安装一下管理工具ipvsadm yum install ipvsadm。 如果以上前提条件如果不满足,则即使kube-proxy的配置开启了ipvs模式,也会退回到iptables模式。
9.安装docker
------详细教程请查看: docker安装完成后,配置为阿里云的源 yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
10.配置kubernetes的yum源
[[email protected] ~]# cat /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
11.iptable设置
[[email protected] sysctl.d]# cat /etc/sysctl.d/k8s.conf net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 net.ipv4.ip_forward = 1 net.ipv4.ip_nonlocal_bind = 1
12.kubeadm、kubectl、kubelet安装
yum install -y kubelet-1.13.1 kubeadm-1.13.1 kubectl-1.13.1 systemctl enable kubelet.service # 配置kubelet使用国内阿里pause镜像,官方的镜像被墙,kubelet启动不了 [[email protected] kubernetes]# cat /etc/sysconfig/kubelet KUBELET_EXTRA_ARGS="--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.1"
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