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[Kubernetes[K8S]集群:Slaver从节点初始化和Join]：添加到主节点集群内

news 2025/7/7 10:25:06

文章目录

操作流程：
上篇主节初始化地址：
前置：Docker和K8S安装版本匹配查看
- 0.1：安装指定docker版本
**[1 — 8] ** [ 这些步骤主从节点前置操作一样的 ]
一：主节点操作查看主机域名->编辑域名->域名配置
二：安装自动填充，虚拟机默认没有
三：关闭防火墙
四：关闭交换空间
五：禁用 Selinux
六：允许 ip tables 检查桥接流量
七：设置K8S相关系统参数
- 7.0：镜像加速
- 7.1：K8S仓库国内源
- 7.2：配置 sysctl 参数，网桥和地址转发，重新启动后配置不变
- - 7.2.1：配置sysctl 内核参数而不重新启动
八：安装K8S -- kubelet，kubeadm，kubectl核心组件
- 8.1：安装命令
九：kubeadm init生成Node
- 9.1: 当前从节点
- - 9.1.1：区别：从节点主要根据主节点生成的join命令进行join操作，不用init操作
- 9.2: 上述会生成如下日志说明成功
10：后续异常Node not ready
- 10.1: 查看异常命令：journalctl -f -u kubelet
- - 10.1.1:[root@10 ~]# 异常查看：journalctl -f -u kubelet 日志如下，cni下的net.d配置找不到
- 10.2: 分析：K8S集群搭建Calico安装先后顺序问题
- 10.3: 解决：调整安装顺序，或拷贝主节点配置到从节点
- 10-(2---3）: 通用需要操作步骤

操作流程：

主节点：安装coredns -> init初始化主节点（此时还没有安装calico）
从节点：基于主节点生成join命令加入集群
主节点：安装calico：apply 生成pod，此时没有调整yaml网卡
coredns 和calico pod 运行成功
但是 calico-node-cl8f2 运行失败
查看解决链接
在这里插入图片描述

上篇主节初始化地址：

前置：Docker和K8S安装版本匹配查看

因为之前写过一篇，calico一直异常，步骤一样所以怀疑是版本不匹配，这次看都是成功的

 Kubernetes 版本	Docker 版本1.20	19.031.21	20.101.22	20.101.23	20.101.24	20.10

0.1：安装指定docker版本

sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

sudo: yum-config-manager：找不到命令 -> 执行

sudo yum install yum-utils

yum list docker-ce --showduplicates | sort -r

[root@10 ~]# yum list docker-ce --showduplicates | sort -r
已加载插件：fastestmirror
已安装的软件包
可安装的软件包* updates: mirrors.ustc.edu.cn
Loading mirror speeds from cached hostfile* extras: mirrors.ustc.edu.cn
docker-ce.x86_64            3:26.0.0-1.el7                     docker-ce-stable
。。。。
docker-ce.x86_64            3:20.10.8-3.el7                    docker-ce-stable
docker-ce.x86_64            3:20.10.5-3.el7                    docker-ce-stable

 yum install docker-ce20.10.8-3.el7 -y

[1 — 8] [ 这些步骤主从节点前置操作一样的 ]

一：主节点操作查看主机域名->编辑域名->域名配置

[root@localhost ~]# hostname
localhost.localdomain
[root@localhost ~]# hostnamectl set-hostname adam-init-slaver-one
[root@localhost ~]# hostname
adam-init-master
[root@localhost ~]#

[root@vbox-master-01-vbox-01 ~]# vi /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
# 以下添加
192.168.56.104  adam-init-master
192.168.56.105  adam-init-slaver-one

二：安装自动填充，虚拟机默认没有

[root@vbox-master-01-vbox-01 ~]# yum -y install bash-completion
已加载插件：fastestmirror, product-id, search-disabled-repos, subscription-managerThis system is not registered with an entitlement server. You can use subscription-manager to register.Determining fastest mirrors* base: ftp.sjtu.edu.cn* extras: mirrors.nju.edu.cn* updates: mirrors.aliyun.com

三：关闭防火墙

systemctl stop firewalld
systemctl disable firewalld

四：关闭交换空间

free -h
swapoff -a
sed -i 's/.*swap.*/#&/' /etc/fstab
free -h

五：禁用 Selinux

sed -i “s/^SELINUX=enforcing/SELINUX=disabled/g” /etc/sysconfig/selinux

[root@nodemaster /]# sed -i "s/^SELINUX=enforcing/SELINUX=disabled/g" /etc/sysconfig/selinux

六：允许 ip tables 检查桥接流量

iptables -F && iptables -X && iptables -F -t nat && iptables -X -t nat && iptables -P FORWARD ACCEPT

七：设置K8S相关系统参数

7.0：镜像加速

第一行驱动

tee /etc/docker/daemon.json <<-'EOF'
{"registry-mirrors": ["https://hnkfbj7x.mirror.aliyuncs.com"],"exec-opts": ["native.cgroupdriver=systemd"]
}
EOF

7.1：K8S仓库国内源

cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
# 是否开启本仓库
enabled=1
# 是否检查 gpg 签名文件
gpgcheck=0
# 是否检查 gpg 签名文件
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpgEOF

7.2：配置 sysctl 参数，网桥和地址转发，重新启动后配置不变

cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-iptables  = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.ipv4.ip_forward                 = 1
EOF

7.2.1：配置sysctl 内核参数而不重新启动

sysctl --system

八：安装K8S – kubelet，kubeadm，kubectl核心组件

8.1：安装命令

[root@master local]# sudo yum install -y kubelet-1.23.0 kubeadm-1.23.0 kubectl-1.23.0 --disableexcludes=kubernetes --nogpgcheck

已安装:kubeadm.x86_64 0:1.23.0-0            kubectl.x86_64 0:1.23.0-0            kubelet.x86_64 0:1.23.0-0作为依赖被安装:conntrack-tools.x86_64 0:1.4.4-7.el7                    cri-tools.x86_64 0:1.26.0-0kubernetes-cni.x86_64 0:1.2.0-0                         libnetfilter_cthelper.x86_64 0:1.0.0-11.el7libnetfilter_cttimeout.x86_64 0:1.0.0-7.el7             libnetfilter_queue.x86_64 0:1.0.2-2.el7_2socat.x86_64 0:1.7.3.2-2.el7完毕！

九：kubeadm init生成Node

9.1: 当前从节点

9.1.1：区别：从节点主要根据主节点生成的join命令进行join操作，不用init操作

9.2: 上述会生成如下日志说明成功

kubeadm join 192.168.56.104:6443 --token zxnok7.i6i4b4id4y5q1nsa --discovery-token-ca-cert-hash

[root@10 ~]# kubeadm join 192.168.56.104:6443 --token zxnok7.i6i4b4id4y5q1nsa         --discovery-token-ca-cert-hash sha256:7760cfca134b2df5ef7757e7a6756a13e66415665dd48ae94a20d98b812c277d
[preflight] Running pre-flight checks[WARNING Service-Docker]: docker service is not enabled, please run 'systemctl enable docker.service'[WARNING Service-Kubelet]: kubelet service is not enabled, please run 'systemctl enable kubelet.service'
[preflight] Reading configuration from the cluster...
[preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -o yaml'
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Starting the kubelet
[kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...This node has joined the cluster:
* Certificate signing request was sent to apiserver and a response was received.
* The Kubelet was informed of the new secure connection details.Run 'kubectl get nodes' on the control-plane to see this node join the cluster.

10：后续异常Node not ready

10.1: 查看异常命令：journalctl -f -u kubelet

10.1.1:[root@10 ~]# 异常查看：journalctl -f -u kubelet 日志如下，cni下的net.d配置找不到

[root@10 ~]# journalctl -f -u kubelet
-- Logs begin at 三 2024-04-10 00:24:03 CST. --
4月 10 02:33:33 adam-init-slaver-one kubelet[9282]: E0410 02:33:33.734603    9282 kubelet.go:2347] "Container runtime network not ready" networkReady="NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized"
4月 10 02:33:38 adam-init-slaver-one kubelet[9282]: I0410 02:33:38.160774    9282 cni.go:240] "Unable to update cni config" err="no networks found in /etc/cni/net.d"
4月 10 02:33:38 adam-init-slaver-one kubelet[9282]: E0410 02:33:38.742263    9282 kubelet.go:2347] "Container runtime network not ready" networkReady="NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized"
4月 10 02:33:40 adam-init-slaver-one kubelet[9282]: E0410 02:33:40.168399    9282 pod_workers.go:918] "Error syncing pod, skipping" err="failed to \"StartContainer\" for \"install-cni\" with CrashLoopBackOff: \"back-off 20s restarting failed container=install-cni pod=calico-node-bdbjk_kube-system(21340f35-c5e1-4e42-a006-3ad6ee4c8a09)\"" pod="kube-system/calico-node-bdbjk" podUID=21340f35-c5e1-4e42-a006-3ad6ee4c8a09
4月 10 02:33:43 adam-init-slaver-one kubelet[9282]: I0410 02:33:43.161188    9282 cni.go:240] "Unable to update cni config" err="no networks found in /etc/cni/net.d"
4月 10 02:33:43 adam-init-slaver-one kubelet[9282]: E0410 02:33:43.750005    9282 kubelet.go:2347] "Container runtime network not ready" networkReady="NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized"

10.2: 分析：K8S集群搭建Calico安装先后顺序问题

当前操作为先安装Master接着安装Calico有net.d文件，安装完Calico再对从节点机器初始化K8S相关操作，net.d没有同步到从机器；

10.3: 解决：调整安装顺序，或拷贝主节点配置到从节点

主节点操作

[root@10 ~]# scp /etc/cni/net.d/* root@sss-slaver-two:/etc/cni/net.d/

此slaver-one为主节点

[root@sv-slaver-one ~]# kubectl get pods -A
NAMESPACE     NAME                                       READY   STATUS    RESTARTS        AGE
kube-system   calico-kube-controllers-64cc74d646-4z8zf   1/1     Running   2 (9h ago)      9h
kube-system   calico-node-cl8f2                          1/1     Running   0               9h
kube-system   calico-node-pfxnd                          1/1     Running   0               9h
kube-system   coredns-6d8c4cb4d-8q7tb                    1/1     Running   2 (9h ago)      9h
kube-system   coredns-6d8c4cb4d-m2gz2                    1/1     Running   2 (9h ago)      9h
kube-system   etcd-sv-slaver-one                         1/1     Running   3 (9h ago)      9h
kube-system   kube-apiserver-sv-slaver-one               1/1     Running   3 (9h ago)      9h
kube-system   kube-controller-manager-sv-slaver-one      1/1     Running   4 (3h59m ago)   9h
kube-system   kube-proxy-6kfnf                           1/1     Running   2 (9h ago)      9h
kube-system   kube-proxy-s9pzm                           1/1     Running   3 (9h ago)      9h
kube-system   kube-scheduler-sv-slaver-one               1/1     Running   4 (3h59m ago)   9h
[root@sv-slaver-one ~]# kubectl get nodes
NAME            STATUS   ROLES                  AGE   VERSION
sv-master       Ready    <none>                 9h    v1.23.0
sv-slaver-one   Ready    control-plane,master   9h    v1.23.0
[root@sv-slaver-one ~]#

10-(2—3）: 通用需要操作步骤

执行
[root@10 docker]# systemctl restart docker
[root@10 docker]# systemctl daemon-reload
[root@10 docker]# systemctl restart kubelet
编辑calico 网卡信息
重新运行calico

如果还没用，重启虚拟机，重复 10-(2—3）操作