【Kubernetes】centos安装Kubernetes集群

1、环境准备

系统centos7
配置yum源参考文章 Centos系统换yum源

步骤1-3是所有主机都要配置，主机名和hosts配置完后可以使用工具命令同步

1.1 主机

一主二从

主机名	ip
k8smaster	192.168.59.148
k8snode1	192.168.59.149
k8snode2	192.168.59.150

分别设置主机名并添加hosts映射

hostnamectl set-hostname k8smaster

vim /etc/hosts

192.168.59.148 k8smaster
192.168.59.149 k8snode1
192.168.59.150 k8snode2

配置参考，127.0.0.1 也要加上当前主机名

测试

1.2 关闭selinux和firewalld

systemctl stop firewalld
systemctl disable firewalld
sed -i 's/enforcing/disabled/' /etc/selinux/config
setenforce 0

1.3 禁止swap分区

swapoff -a

1.4 将桥接的IPv4流量传递到iptables的链

cat > /etc/sysctl.d/k8s.conf << EOF
net.ipv4.ip_forward = 1
net.ipv4.tcp_tw_recycle = 0
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF

sysctl --system

2、安装部署docker

安装推荐文章 Linux环境下docker安装

简单的docker安装

yum install ca-certificates curl -y
yum install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin -y

配置参考
vim /etc/docker/daemon.json

{
"registry-mirrors": ["https://hub-mirror.c.163.com","https://registry.aliyuncs.com","https://registry.docker-cn.com","https://docker.mirrors.ustc.edu.cn"],
"data-root": "/data/docker",
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": { "max-size": "300m","max-file": "3" },
"live-restore": true
}

#查看是否启动
service docker status
service docker start #启动
#设置开机自启
systemctl enable docker && systemctl restart docker && systemctl status docker
 #基本信息
docker info

docker-compose安装 docker-compose版本要自己去github看

containerd 配置文件参考

vim /etc/containerd/conf.toml

disabled_plugins = []
imports = []
oom_score = 0
plugin_dir = ""
required_plugins = []
root = "/var/lib/containerd"
state = "/run/containerd"
temp = ""
version = 2
 
[cgroup]
  path = ""
 
[debug]
  address = ""
  format = ""
  gid = 0
  level = ""
  uid = 0
 
[grpc]
  address = "/run/containerd/containerd.sock"
  gid = 0
  max_recv_message_size = 16777216
  max_send_message_size = 16777216
  tcp_address = ""
  tcp_tls_ca = ""
  tcp_tls_cert = ""
  tcp_tls_key = ""
  uid = 0
 
[metrics]
  address = ""
  grpc_histogram = false
 
[plugins]
 
  [plugins."io.containerd.gc.v1.scheduler"]
    deletion_threshold = 0
    mutation_threshold = 100
    pause_threshold = 0.02
    schedule_delay = "0s"
    startup_delay = "100ms"
 
  [plugins."io.containerd.grpc.v1.cri"]
    device_ownership_from_security_context = false
    disable_apparmor = false
    disable_cgroup = false
    disable_hugetlb_controller = true
    disable_proc_mount = false
    disable_tcp_service = true
    enable_selinux = false
    enable_tls_streaming = false
    enable_unprivileged_icmp = false
    enable_unprivileged_ports = false
    ignore_image_defined_volumes = false
    max_concurrent_downloads = 3
    max_container_log_line_size = 16384
    netns_mounts_under_state_dir = false
    restrict_oom_score_adj = false
    sandbox_image = "registry.aliyuncs.com/google_containers/pause:3.6"
    selinux_category_range = 1024
    stats_collect_period = 10
    stream_idle_timeout = "4h0m0s"
    stream_server_address = "127.0.0.1"
    stream_server_port = "0"
    systemd_cgroup = false
    tolerate_missing_hugetlb_controller = true
    unset_seccomp_profile = ""
 
    [plugins."io.containerd.grpc.v1.cri".cni]
      bin_dir = "/opt/cni/bin"
      conf_dir = "/etc/cni/net.d"
      conf_template = ""
      ip_pref = ""
      max_conf_num = 1
 
    [plugins."io.containerd.grpc.v1.cri".containerd]
      default_runtime_name = "runc"
      disable_snapshot_annotations = true
      discard_unpacked_layers = false
      ignore_rdt_not_enabled_errors = false
      no_pivot = false
      snapshotter = "overlayfs"
 
      [plugins."io.containerd.grpc.v1.cri".containerd.default_runtime]
        base_runtime_spec = ""
        cni_conf_dir = ""
        cni_max_conf_num = 0
        container_annotations = []
        pod_annotations = []
        privileged_without_host_devices = false
        runtime_engine = ""
        runtime_path = ""
        runtime_root = ""
        runtime_type = ""
 
        [plugins."io.containerd.grpc.v1.cri".containerd.default_runtime.options]
 
      [plugins."io.containerd.grpc.v1.cri".containerd.runtimes]
 
        [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc]
          base_runtime_spec = ""
          cni_conf_dir = ""
          cni_max_conf_num = 0
          container_annotations = []
          pod_annotations = []
          privileged_without_host_devices = false
          runtime_engine = ""
          runtime_path = ""
          runtime_root = ""
          runtime_type = "io.containerd.runc.v2"
 
          [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc.options]
            BinaryName = ""
            CriuImagePath = ""
            CriuPath = ""
            CriuWorkPath = ""
            IoGid = 0
            IoUid = 0
            NoNewKeyring = false
            NoPivotRoot = false
            Root = ""
            ShimCgroup = ""
            SystemdCgroup = true
 
      [plugins."io.containerd.grpc.v1.cri".containerd.untrusted_workload_runtime]
        base_runtime_spec = ""
        cni_conf_dir = ""
        cni_max_conf_num = 0
        container_annotations = []
        pod_annotations = []
        privileged_without_host_devices = false
        runtime_engine = ""
        runtime_path = ""
        runtime_root = ""
        runtime_type = ""
 
        [plugins."io.containerd.grpc.v1.cri".containerd.untrusted_workload_runtime.options]
 
    [plugins."io.containerd.grpc.v1.cri".image_decryption]
      key_model = "node"
 
    [plugins."io.containerd.grpc.v1.cri".registry]
      config_path = ""
 
      [plugins."io.containerd.grpc.v1.cri".registry.auths]
 
      [plugins."io.containerd.grpc.v1.cri".registry.configs]
        [plugins."io.containerd.grpc.v1.cri".registry.configs."k8smaster:5000".tls]
          insecure_skip_verify = true
 
      [plugins."io.containerd.grpc.v1.cri".registry.headers]
 
      [plugins."io.containerd.grpc.v1.cri".registry.mirrors]
        [plugins."io.containerd.grpc.v1.cri".registry.mirrors."k8smaster:5000"]
          endpoint = ["http://k8smaster:5000"]
 
    [plugins."io.containerd.grpc.v1.cri".x509_key_pair_streaming]
      tls_cert_file = ""
      tls_key_file = ""
 
  [plugins."io.containerd.internal.v1.opt"]
    path = "/opt/containerd"
 
  [plugins."io.containerd.internal.v1.restart"]
    interval = "10s"
 
  [plugins."io.containerd.internal.v1.tracing"]
    sampling_ratio = 1.0
    service_name = "containerd"
 
  [plugins."io.containerd.metadata.v1.bolt"]
    content_sharing_policy = "shared"
 
  [plugins."io.containerd.monitor.v1.cgroups"]
    no_prometheus = false
 
  [plugins."io.containerd.runtime.v1.linux"]
    no_shim = false
    runtime = "runc"
    runtime_root = ""
    shim = "containerd-shim"
    shim_debug = false
 
  [plugins."io.containerd.runtime.v2.task"]
    platforms = ["linux/amd64"]
    sched_core = false
 
  [plugins."io.containerd.service.v1.diff-service"]
    default = ["walking"]
 
  [plugins."io.containerd.service.v1.tasks-service"]
    rdt_config_file = ""
 
  [plugins."io.containerd.snapshotter.v1.aufs"]
    root_path = ""
 
  [plugins."io.containerd.snapshotter.v1.btrfs"]
    root_path = ""
 
  [plugins."io.containerd.snapshotter.v1.devmapper"]
    async_remove = false
    base_image_size = ""
    discard_blocks = false
    fs_options = ""
    fs_type = ""
    pool_name = ""
    root_path = ""
 
  [plugins."io.containerd.snapshotter.v1.native"]
    root_path = ""
 
  [plugins."io.containerd.snapshotter.v1.overlayfs"]
    root_path = ""
    upperdir_label = false
 
  [plugins."io.containerd.snapshotter.v1.zfs"]
    root_path = ""
 
  [plugins."io.containerd.tracing.processor.v1.otlp"]
    endpoint = ""
    insecure = false
    protocol = ""
 
[proxy_plugins]
 
[stream_processors]
 
  [stream_processors."io.containerd.ocicrypt.decoder.v1.tar"]
    accepts = ["application/vnd.oci.image.layer.v1.tar+encrypted"]
    args = ["--decryption-keys-path", "/etc/containerd/ocicrypt/keys"]
    env = ["OCICRYPT_KEYPROVIDER_CONFIG=/etc/containerd/ocicrypt/ocicrypt_keyprovider.conf"]
    path = "ctd-decoder"
    returns = "application/vnd.oci.image.layer.v1.tar"
 
  [stream_processors."io.containerd.ocicrypt.decoder.v1.tar.gzip"]
    accepts = ["application/vnd.oci.image.layer.v1.tar+gzip+encrypted"]
    args = ["--decryption-keys-path", "/etc/containerd/ocicrypt/keys"]
    env = ["OCICRYPT_KEYPROVIDER_CONFIG=/etc/containerd/ocicrypt/ocicrypt_keyprovider.conf"]
    path = "ctd-decoder"
    returns = "application/vnd.oci.image.layer.v1.tar+gzip"
 
[timeouts]
  "io.containerd.timeout.bolt.open" = "0s"
  "io.containerd.timeout.shim.cleanup" = "5s"
  "io.containerd.timeout.shim.load" = "5s"
  "io.containerd.timeout.shim.shutdown" = "3s"
  "io.containerd.timeout.task.state" = "2s"
 
[ttrpc]
  address = ""
  gid = 0
  uid = 0

3、部署k8s基础命令

3.1 添加k8s阿里云的yum源

cat > /etc/yum.repos.d/kubernetes.repo << EOF[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

或者用vim

vim /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg

3.2 查看最新可安装的软件

yum --disablerepo="*" --enablerepo="kubernetes" list available

3.3 安装kubeadm、kubectl、kubelet

我这里装的版本是1.28.2

yum install -y kubelet-1.28.2 kubeadm-1.28.2 kubectl-1.28.2
systemctl start kubelet
systemctl enable kubelet

#查看错误日志
journalctl -u kubelet

4、部署集群

查询各个组件的版本

kubeadm config images list

4.1 初始化master

只要在主节点上执行

kubeadm init --kubernetes-version=1.28.13 \
--apiserver-advertise-address=192.168.59.148 \
--image-repository registry.aliyuncs.com/google_containers \
--service-cidr=10.140.0.0/16 \
--pod-network-cidr=10.244.0.0/16

参数注释：
–apiserver-advertise-address
指明用Master的哪个interface与Cluster 的其他节点通信。 如果Master有多个interface， 建议明确指定， 如果 不指定， kubeadm会自动选择有默认网关的interface。

–pod-network-cidr
选择一个Pod网络插件，并检查它是否需要在初始化Master时指定一些参数，它的值取决于你在下一步选择的哪个网络网络插件，这里选择Flannel的网络插件参数为 10.244.0.0/16。Calico网络为192.168.0.0/16。参考：Installing a pod network add-on

-service-cidr
​ 选择service网络

–image-repository
使用kubeadm config images pull来预先拉取初始化需要用到的镜像，用来检查是否能连接到Kubenetes的Registries。Kubenetes默认Registries地址是k8s.gcr.io，很明显，在国内并不能访问gcr.io，因此在kubeadm v1.13之前的版本，安装起来非常麻烦，但是在1.13版本中终于解决了国内的痛点，其增加了一个–image-repository参数，默认值是k8s.gcr.io，我们将其指定为国内镜像地址：registry.aliyuncs.com/google_containers。

–kubernetes-version
默认值是stable-1，会导致从https://dl.k8s.io/release/stable-1.txt下载最新的版本号，我们可以将其指定为固定版本来跳过网络请求。

4.2 报错以及问题处理

查看报错命令
journalctl -xeu kubelet

问题一

node节点也要注释掉

[init] Using Kubernetes version: v1.28.13
[preflight] Running pre-flight checks
error execution phase preflight: [preflight] Some fatal errors occurred:
[ERROR CRI]: container runtime is not running: output: time=“2024-09-12T14:01:03+08:00” level=fatal msg=“validate service connection: CRI v1 runtime API is not implemented for endpoint “unix:///var/run/containerd/containerd.sock”: rpc error: code = Unimplemented desc = unknown service runtime.v1.RuntimeService”
, error: exit status 1
[preflight] If you know what you are doing, you can make a check non-fatal with --ignore-preflight-errors=...
To see the stack trace of this error execute with --v=5 or higher
查看版本没问题，看看有没有启动
[root@localhost home]# containerd -v
containerd containerd.io 1.6.33 d2d58213f83a351ca8f528a95fbd145f5654e957
[root@localhost home]# docker -v
Docker version 26.1.4, build 5650f9b
编辑以下文件，将下面一行内容注释掉
vim /etc/containerd/config.toml
#disabled_plugins = [“cri”]
原因：containerd安装的默认禁用（重点）
使用安装包安装的containerd会默认禁用作为容器运行时的功能，即安装包安装containerd后默认禁用containerd作为容器运行时
这个时候使用k8s就会报错了，因为没有容器运行时可以用
开启方法就是将/etc/containerd/config.toml文件中的disabled_plugins的值的列表中不包含cri
修改后重启containerd才会生效
systemctl restart containerd

问题二

如果kubernets初始化时失败后，第二次再次执行会初始化命令会报错，这时需要进行重置

[root@localhost home]# kubeadm init --kubernetes-version=1.28.13 --apiserver-advertise-address=192.168.59.148 --image-repository registry.aliyuncs.com/google_containers --service-cidr=10.140.0.0/16 --pod-network-cidr=10.244.0.0/16
[init] Using Kubernetes version: v1.28.13
[preflight] Running pre-flight checks
error execution phase preflight: [preflight] Some fatal errors occurred:
[ERROR Port-6443]: Port 6443 is in use
[ERROR Port-10259]: Port 10259 is in use
[ERROR Port-10257]: Port 10257 is in use
[ERROR FileAvailable–etc-kubernetes-manifests-kube-apiserver.yaml]: /etc/kubernetes/manifests/kube-apiserver.yaml already exists
[ERROR FileAvailable–etc-kubernetes-manifests-kube-controller-manager.yaml]: /etc/kubernetes/manifests/kube-controller-manager.yaml already exists
[ERROR FileAvailable–etc-kubernetes-manifests-kube-scheduler.yaml]: /etc/kubernetes/manifests/kube-scheduler.yaml already exists
[ERROR FileAvailable–etc-kubernetes-manifests-etcd.yaml]: /etc/kubernetes/manifests/etcd.yaml already exists
[ERROR Port-10250]: Port 10250 is in use
[ERROR Port-2379]: Port 2379 is in use
[ERROR Port-2380]: Port 2380 is in use
[ERROR DirAvailable–var-lib-etcd]: /var/lib/etcd is not empty
[preflight] If you know what you are doing, you can make a check non-fatal with --ignore-preflight-errors=...
To see the stack trace of this error execute with --v=5 or higher

解决方法

kubeadm reset

问题三

驱动加载 这个问题我没遇到
执行下面这两个命令

modprobe br_netfilter 
bridge

问题四

Unfortunately, an error has occurred:
timed out waiting for the condition

This error is likely caused by:
- The kubelet is not running
- The kubelet is unhealthy due to a misconfiguration of the node in some way (required cgroups disabled)
If you are on a systemd-powered system, you can try to troubleshoot the error with the following commands:
- ‘systemctl status kubelet’
- ‘journalctl -xeu kubelet’
Additionally, a control plane component may have crashed or exited when started by the container runtime.
To troubleshoot, list all containers using your preferred container runtimes CLI.
Here is one example how you may list all running Kubernetes containers by using crictl:
- ‘crictl --runtime-endpoint unix:///var/run/containerd/containerd.sock ps -a | grep kube | grep -v pause’
Once you have found the failing container, you can inspect its logs with:
- ‘crictl --runtime-endpoint unix:///var/run/containerd/containerd.sock logs CONTAINERID’
error execution phase wait-control-plane: couldn’t initialize a Kubernetes cluster
To see the stack trace of this error execute with --v=5 or higher

使用 journalctl -xeu kubelet 查看报错
failed to resolve reference \"registry.k8s.io/pause:3.6

解决方法：
#生成 containerd 的默认配置文件
containerd config default > /etc/containerd/config.toml
#查看 sandbox 的默认镜像仓库在文件中的第几行
cat /etc/containerd/config.toml | grep -n “sandbox_image”
#使用 vim 编辑器 定位到 sandbox_image，将 仓库地址修改成 registry.aliyuncs.com/google_containers/pause:3.6
vim /etc/containerd/config.toml
sandbox_image = “registry.aliyuncs.com/google_containers/pause:3.6”
#重启 containerd 服务
systemctl daemon-reload
systemctl restart containerd.service

记得要
kubeadm reset

4.3执行成功

Your Kubernetes control-plane has initialized successfully!

To start using your cluster, you need to run the following as a regular user:

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

Alternatively, if you are the root user, you can run:

  export KUBECONFIG=/etc/kubernetes/admin.conf

You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
  https://kubernetes.io/docs/concepts/cluster-administration/addons/

Then you can join any number of worker nodes by running the following on each as root:

kubeadm join 192.168.59.148:6443 --token 3otopj.v2r7x7gcpa4j1tv3 \
	--discovery-token-ca-cert-hash sha256:b881ce5117a2ed28cb4f86963b462cc77976194c33c9314dbf4647f011354dc1

初始化完成后会生成一串命令用于node节点的加入

4.4关于token

token一般24小时候就会过期

查看当前token

[root@localhost home]# kubeadm token list
TOKEN                     TTL         EXPIRES                USAGES                   DESCRIPTION                                                EXTRA GROUPS
3otopj.v2r7x7gcpa4j1tv3   23h         2024-09-13T06:41:42Z   authentication,signing   The default bootstrap token generated by 'kubeadm init'.   system:bootstrappers:kubeadm:default-node-token

查看本机sha256值

openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der

重新生成token

kubeadm token create

重新生成token并打印出join命令

kubeadm token create --print-join-command

如果要加入master节点，需要先生成certificate-key（1.16版本前参数为–experimental-upload-certs，1.16及1.16版本以后为–upload-certs）

kubeadm init phase upload-certs --upload-certs

结合上面join和certs的（同样，1.16版本前参数为–experimental-control-plane --certificate-key ，1.16及1.16版本以后为–control-plane --certificate-key）

kubeadm join 192.168.59.148:6443 --token fpjwdf.p9bnbqf7cpvf1amc --discovery-token-ca-cert-hash sha256:dd3cb5208a4ca032e85a5a30b9b02f963aff2fece13045cf8c74d7b9ed7f6098 --control-plane --certificate-key 820908fa5d83b9a7314a58147b80d0dc81b4f7469c9c8f72fb49b4fba2652c29

4.5配置kubectl

执行上面返回的命令

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

root用户执行永久生效

echo "export KUBECONFIG=/etc/kubernetes/admin.conf" > /etc/profile.d/kubeconfig.sh
source /etc/profile.d/kubeconfig.sh

不然就临时生效

export KUBECONFIG=/etc/kubernetes/admin.conf

将admin.conf拷贝到其他需要使用kunectl命令的node节点

scp /etc/kubernetes/admin.conf root@192.168.59.149:/etc/kubernetes/
scp /etc/kubernetes/admin.conf root@192.168.59.150:/etc/kubernetes/

一样执行生效
export KUBECONFIG=/etc/kubernetes/admin.conf
或者
echo “export KUBECONFIG=/etc/kubernetes/admin.conf” > /etc/profile.d/kubeconfig.sh
source /etc/profile.d/kubeconfig.sh

4.6加入节点

在除master外其他node节点执行上面的join命令，加入k8s集群

kubeadm join 192.168.59.148:6443 --token 3otopj.v2r7x7gcpa4j1tv3 --discovery-token-ca-cert-hash sha256:b881ce5117a2ed28cb4f86963b462cc77976194c33c9314dbf4647f011354dc1

加入成功

[root@localhost home]# kubeadm join 192.168.59.148:6443 --token 3otopj.v2r7x7gcpa4j1tv3 --discovery-token-ca-cert-hash sha256:b881ce5117a2ed28cb4f86963b462cc77976194c33c9314dbf4647f011354dc1
[preflight] Running pre-flight checks
[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.

查看节点

[root@localhost home]# kubectl get nodes
NAME        STATUS     ROLES           AGE   VERSION
k8smaster   NotReady   control-plane   32m   v1.28.2
k8snode1    NotReady   <none>          13s   v1.28.2
k8snode2    NotReady   <none>          5s    v1.28.2

4.7移除节点node

不移除的可以直接下一步

[root@localhost flanneld]# kubectl drain k8snode2 --delete-local-data --force --ignore-daemonsets
Flag --delete-local-data has been deprecated, This option is deprecated and will be deleted. Use --delete-emptydir-data.
node/k8snode2 cordoned
Warning: ignoring DaemonSet-managed Pods: kube-system/kube-proxy-p8cxh
evicting pod tigera-operator/tigera-operator-748c69cf45-9clh2

pod/tigera-operator-748c69cf45-9clh2 evicted
node/k8snode2 drained
[root@localhost flanneld]# kubectl get nodes
NAME        STATUS                        ROLES           AGE     VERSION
k8smaster   Ready                         control-plane   3h13m   v1.28.2
k8snode1    NotReady                      <none>          161m    v1.28.2
k8snode2    NotReady,SchedulingDisabled   <none>          161m    v1.28.2
[root@localhost flanneld]# 

[root@localhost flanneld]# kubectl delete node k8snode2
node "k8snode2" deleted
[root@localhost flanneld]# pwd
/data/flanneld
[root@localhost flanneld]# cd /etc/kubernetes/
[root@localhost kubernetes]# ll
总用量 32
-rw-------. 1 root root 5650 9月  12 14:41 admin.conf
-rw-------. 1 root root 5682 9月  12 14:41 controller-manager.conf
-rw-------. 1 root root 1982 9月  12 14:41 kubelet.conf
drwxr-xr-x. 2 root root  113 9月  12 14:41 manifests
drwxr-xr-x. 3 root root 4096 9月  12 14:41 pki
-rw-------. 1 root root 5626 9月  12 14:41 scheduler.conf
[root@localhost kubernetes]# kubeadm reset -f
[reset] Reading configuration from the cluster...
[reset] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -o yaml'
[preflight] Running pre-flight checks
[reset] Deleted contents of the etcd data directory: /var/lib/etcd
[reset] Stopping the kubelet service
[reset] Unmounting mounted directories in "/var/lib/kubelet"
[reset] Deleting contents of directories: [/etc/kubernetes/manifests /var/lib/kubelet /etc/kubernetes/pki]
[reset] Deleting files: [/etc/kubernetes/admin.conf /etc/kubernetes/kubelet.conf /etc/kubernetes/bootstrap-kubelet.conf /etc/kubernetes/controller-manager.conf /etc/kubernetes/scheduler.conf]

The reset process does not clean CNI configuration. To do so, you must remove /etc/cni/net.d

The reset process does not reset or clean up iptables rules or IPVS tables.
If you wish to reset iptables, you must do so manually by using the "iptables" command.

If your cluster was setup to utilize IPVS, run ipvsadm --clear (or similar)
to reset your system's IPVS tables.

The reset process does not clean your kubeconfig files and you must remove them manually.
Please, check the contents of the $HOME/.kube/config file.
[root@localhost kubernetes]# ls
manifests  pki

# 重新加入
上面的 kubeadm join 

5、安装CNI网络插件

master上执行，安装flannel 网络插件

下载yaml文件，网咯会有波动，可以多wget几次

wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

注意，net-conf.json的Network配置 要是上面init pod-network-cidr的网段地址

vim kube-flannel.yml

安装插件

kubectl apply -f kube-flannel.yml

kubectl get pods -n kube-flannel
kubectl get nodes

出现问题

网络实际没连上

k8s flannel网络插件国内镜像docker拉取不到 docker.io/flannel/flannel:v0.25.6
解决方案：手动到github下载，然后docker构建
下载这两个 根据kube-flannel.yml里面的版本去找
flannel:v0.25.6
flannel-cni-plugin:v1.5.1-flannel2

[root@localhost flanneld]# docker import flannel-v0.25.6-linux-amd64.tar.gz flannel/flannel:v0.25.6
sha256:5c76b00ff15dfc6d452f1dcce31d7508e13363c9ab9beeddd90dd1a6204fcab8
[root@localhost flanneld]# docker import cni-plugin-flannel-linux-amd64-v1.5.1-flannel2.tgz flannel/flannel-cni-plugin:v1.5.1-flannel2
sha256:fd42d9ebb5885a5889bb0211e560b04b18dab401e3b63e777d4d1f358a847df6

构建成功会有两个包

将这两个打成tar包

[root@localhost flanneld]# docker images
REPOSITORY                   TAG               IMAGE ID       CREATED          SIZE
flannel/flannel-cni-plugin   v1.5.1-flannel2   fd42d9ebb588   12 minutes ago   2.54MB
flannel/flannel              v0.25.6           5c76b00ff15d   12 minutes ago   42.8MB
[root@localhost flanneld]# docker save flannel/flannel:v0.25.6 
cowardly refusing to save to a terminal. Use the -o flag or redirect
[root@localhost flanneld]# docker save flannel/flannel:v0.25.6 -o flannel-v0.25.6.tar
[root@localhost flanneld]# ll
总用量 55832
-rw-r--r--. 1 root root  1080975 9月  12 16:30 cni-plugin-flannel-linux-amd64-v1.5.1-flannel2.tgz
-rw-r--r--. 1 root root 13305488 9月  12 16:15 flannel-v0.25.6-linux-amd64.tar.gz
-rw-------. 1 root root 42772992 9月  12 16:55 flannel-v0.25.6.tar
-rw-r--r--. 1 root root     4345 9月  12 15:41 kube-flannel.yml
[root@localhost flanneld]# docker save flannel/flannel-cni-plugin:v1.5.1-flannel2 -o cni-plugin-flannel-linux-amd64-v1.5.1-flannel2.tar
[root@localhost flanneld]# docker images
REPOSITORY                   TAG               IMAGE ID       CREATED          SIZE
flannel/flannel-cni-plugin   v1.5.1-flannel2   fd42d9ebb588   14 minutes ago   2.54MB
flannel/flannel              v0.25.6           5c76b00ff15d   15 minutes ago   42.8MB
[root@localhost flanneld]# ll
总用量 58336
-rw-------. 1 root root  2560512 9月  12 16:56 cni-plugin-flannel-linux-amd64-v1.5.1-flannel2.tar
-rw-r--r--. 1 root root  1080975 9月  12 16:30 cni-plugin-flannel-linux-amd64-v1.5.1-flannel2.tgz
-rw-r--r--. 1 root root 13305488 9月  12 16:15 flannel-v0.25.6-linux-amd64.tar.gz
-rw-------. 1 root root 42772992 9月  12 16:55 flannel-v0.25.6.tar
-rw-r--r--. 1 root root     4345 9月  12 15:41 kube-flannel.yml
[root@localhost flanneld]# 

将tar镜像压缩包，导入到containerd的k8s.io命名空间中

[root@localhost flanneld]# ll
总用量 58336
-rw-------. 1 root root  2560512 9月  12 16:56 cni-plugin-flannel-linux-amd64-v1.5.1-flannel2.tar
-rw-r--r--. 1 root root  1080975 9月  12 16:30 cni-plugin-flannel-linux-amd64-v1.5.1-flannel2.tgz
-rw-r--r--. 1 root root 13305488 9月  12 16:15 flannel-v0.25.6-linux-amd64.tar.gz
-rw-------. 1 root root 42772992 9月  12 16:55 flannel-v0.25.6.tar
-rw-r--r--. 1 root root     4345 9月  12 15:41 kube-flannel.yml
[root@localhost flanneld]# sudo ctr -n k8s.io images import cni-plugin-flannel-linux-amd64-v1.5.1-flannel2.tar 
unpacking docker.io/flannel/flannel-cni-plugin:v1.5.1-flannel2 (sha256:2e67e1ceda143a11deca57c0bd3145c9a1998d78d1084e3028c26ae6ceea233f)...done
[root@localhost flanneld]# sudo ctr -n k8s.io images import flannel-v0.25.6.tar 
unpacking docker.io/flannel/flannel:v0.25.6 (sha256:7dcf8fbbc9e9acbe2e5e3e7321b74aa357a5f4246152f6539da903370fc3f999)...done
[root@localhost flanneld]# 

检查是否成功

sudo ctr -n k8s.io i check | grep flannel

然后修改 kube-flannel.yml 文件

---
kind: Namespace
apiVersion: v1
metadata:
  name: kube-flannel
  labels:
    k8s-app: flannel
    pod-security.kubernetes.io/enforce: privileged
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  labels:
    k8s-app: flannel
  name: flannel
rules:
- apiGroups:
  - ""
  resources:
  - pods
  verbs:
  - get
- apiGroups:
  - ""
  resources:
  - nodes
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - ""
  resources:
  - nodes/status
  verbs:
  - patch
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  labels:
    k8s-app: flannel
  name: flannel
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: flannel
subjects:
- kind: ServiceAccount
  name: flannel
  namespace: kube-flannel
---
apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    k8s-app: flannel
  name: flannel
  namespace: kube-flannel
---
kind: ConfigMap
apiVersion: v1
metadata:
  name: kube-flannel-cfg
  namespace: kube-flannel
  labels:
    tier: node
    k8s-app: flannel
    app: flannel
data:
  cni-conf.json: |
    {
      "name": "cbr0",
      "cniVersion": "0.3.1",
      "plugins": [
        {
          "type": "flannel",
          "delegate": {
            "hairpinMode": true,
            "isDefaultGateway": true
          }
        },
        {
          "type": "portmap",
          "capabilities": {
            "portMappings": true
          }
        }
      ]
    }
  net-conf.json: |
    {
      "Network": "10.244.0.0/16",
      "EnableNFTables": false,
      "Backend": {
        "Type": "vxlan"
      }
    }
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: kube-flannel-ds
  namespace: kube-flannel
  labels:
    tier: node
    app: flannel
    k8s-app: flannel
spec:
  selector:
    matchLabels:
      app: flannel
  template:
    metadata:
      labels:
        tier: node
        app: flannel
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: kubernetes.io/os
                operator: In
                values:
                - linux
      hostNetwork: true
      priorityClassName: system-node-critical
      tolerations:
      - operator: Exists
        effect: NoSchedule
      serviceAccountName: flannel
      initContainers:
      - name: install-cni-plugin
        image: docker.io/flannel/flannel-cni-plugin:v1.5.1-flannel2
        imagePullPolicy: Never
        command:
        - cp
        args:
        - -f
        - /flannel
        - /opt/cni/bin/flannel
        volumeMounts:
        - name: cni-plugin
          mountPath: /opt/cni/bin
      - name: install-cni
        image: docker.io/flannel/flannel:v0.25.6
        imagePullPolicy: Never
        command:
        - cp
        args:
        - -f
        - /etc/kube-flannel/cni-conf.json
        - /etc/cni/net.d/10-flannel.conflist
        volumeMounts:
        - name: cni
          mountPath: /etc/cni/net.d
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      containers:
      - name: kube-flannel
        image: docker.io/flannel/flannel:v0.25.6
        imagePullPolicy: Never
        command:
        - /opt/bin/flanneld
        args:
        - --ip-masq
        - --kube-subnet-mgr
        resources:
          requests:
            cpu: "100m"
            memory: "50Mi"
        securityContext:
          privileged: false
          capabilities:
            add: ["NET_ADMIN", "NET_RAW"]
        env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        - name: EVENT_QUEUE_DEPTH
          value: "5000"
        volumeMounts:
        - name: run
          mountPath: /run/flannel
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
        - name: xtables-lock
          mountPath: /run/xtables.lock
      volumes:
      - name: run
        hostPath:
          path: /run/flannel
      - name: cni-plugin
        hostPath:
          path: /opt/cni/bin
      - name: cni
        hostPath:
          path: /etc/cni/net.d
      - name: flannel-cfg
        configMap:
          name: kube-flannel-cfg
      - name: xtables-lock
        hostPath:
          path: /run/xtables.lock
          type: FileOrCreate

先删除

kubectl delete -f kube-flannel.yml

再构建

kubectl apply -f kube-flannel.yml

我这里还是失败 换calico了 MD ，不然就是开科技
卸了

kubectl delete -f kube-flannel.yml

安装calico

我这里直接 kubeadm reset 了 重新来一遍，master和node节点都reset，init的时候–pod-network-cidr=192.168.0.0/16，calico是192.168.0.0

calico官方地址

kubectl create -f https://raw.gitmirror.com/projectcalico/calico/v3.27.2/manifests/tigera-operator.yaml

wget https://raw.gitmirror.com/projectcalico/calico/v3.27.2/manifests/custom-resources.yaml
vim custom-resources.yaml
#把里边cidr：ip 更换，根据你pod-network-cidr的参数更换 
cidr: 10.244.0.0/16

构建
kubectl create -f custom-resources.yaml
查看
kubectl get pod -A