高可用containerd搭建K8s集群【v1.25】

#默认是没有配置文件的，可以像k8s一样获取到一些默认配置。
mkdir -p /etc/containerd
containerd config default > /etc/containerd/config.toml

#配置systemd cgroup驱动（在配置文件中如下位置添加SystemdCgroup = true）
sed -i 's/SystemdCgroup = false/SystemdCgroup = true/g' /etc/containerd/config.toml
grep 'SystemdCgroup = true' -B 7 /etc/containerd/config.toml
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cat << EOF >> /etc/crictl.yaml
runtime-endpoint: unix:///var/run/containerd/containerd.sock
image-endpoint: unix:///var/run/containerd/containerd.sock
timeout: 10 
debug: false
EOF
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#修改pause容器为阿里云的地址：
sed -i 's#sandbox_image = "registry.k8s.io/pause:3.6"#sandbox_image = "registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.8"#g' /etc/containerd/config.toml
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#编辑Containerd的配置文件 /etc/containerd/config.toml， 在 [plugins."io.containerd.grpc.v1.cri".registry] 下方添加 config_path
    [plugins."io.containerd.grpc.v1.cri".registry]
      config_path = "/etc/containerd/certs.d"

#替换
sed -i 's#config_path = ""#config_path = "/etc/containerd/certs.d"#g' /etc/containerd/config.toml 
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#创建目录 /etc/containerd/certs.d/docker.io，在其中添加包含下面内容的 hosts.toml 文件
mkdir -pv /etc/containerd/certs.d/docker.io
cat >/etc/containerd/certs.d/docker.io/hosts.toml <

#启动服务
systemctl daemon-reload
systemctl enable --now containerd

#重启containerd
systemctl restart containerd

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#如果你的环境中网络代理去访问外网，containerd也需要单独添加代理：
mkdir /etc/systemd/system/containerd.service.d
cat > /etc/systemd/system/containerd.service.d/http_proxy.conf << EOF
[Service]
Environment="HTTP_PROXY=http://:/"
Environment="HTTPS_PROXY=http://:/"
Environment="NO_PROXY=x.x.x.x,x.x.x.x"
EOF
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yum install keepalived psmisc -y
mv /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak
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cat>/etc/keepalived/keepalived.conf<

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• 上述问题存在故障，暂时使用下方文件

[root@k8s-master2 ~]# cat /etc/keepalived/keepalived.conf
global_defs {
 router_id keepalive-master
}

vrrp_script check_apiserver {
 # 检测脚本路径
 script "/etc/keepalived/check_k8s.sh"
 # 多少秒检测一次
 interval 3
 # 失败的话权重-2
 weight -2
}

vrrp_instance VI-kube-master {
   state MASTER  # 定义节点角色
   interface ens160 # 网卡名称
   virtual_router_id 68
   priority 90
   dont_track_primary
   advert_int 3
   virtual_ipaddress {
     # 自定义虚拟ip
     192.168.4.100
   }
   track_script {
       check_k8s.sh
   }
}
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3）创建判断脚本

#创建check_k8s.sh检测脚本
[root@master1 ~]# vim /etc/keepalived/check_k8s.sh
#!/bin/bash
#获取操作系统盘、数据盘的磁盘容量百分比、K8S服务运行情况
root_percent=`df -h |grep root |awk '{ print $5 }'|awk -F % '{ print $1 }'`
data_percent=`df -h |grep /data$ |awk '{ print $5 }'|awk -F % '{ print $1 }'`
ID0=`ps -ef |grep -E "kube-proxy|kube-apiserver|kubelet|kube-scheduler|kube-scheduler|kube-scheduler" |wc -l`
curl -s 127.0.0.1:6443 >> /dev/null
ID1=`echo $?`

if [ $root_percent -gt 95 ] || [ $data_percent -gt 95 ];then
        exit 1; 
elif [ "$ID0" -ne 5 ] || [ "$ID1" -ne 0 ];then
        exit 2;
else
        exit 0;
fi
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#加载keepalived.conf配置文件
keepalived -D -f /etc/keepalived/keepalived.conf

#检查keepalived.conf配置文件是否加载成功
keepalived -l

#脚本授权
chmod o+x /etc/keepalived/check_k8s.sh

#开放Keepalived防火墙规则
# firewall-cmd --direct --permanent --add-rule ipv4 filter INPUT 0 --in-interface ens160 --destination 0.0.0.0/0 --protocol vrrp -j ACCEPT
# firewall-cmd --reload
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4）配置keepalived日志

#配置keepalived
[root@lb02 ~]# vim /etc/sysconfig/keepalived
KEEPALIVED_OPTIONS="-D -d -S 0"
 
#配置rsyslog
[root@lb02 ~]# vim /etc/rsyslog.conf
local0.*               /var/log/keepalived.log
 
#重启服务
[root@lb02 ~]# systemctl restart rsyslog 
[root@lb02 ~]# systemctl restart keepalived
 
#查看日志
[root@lb02 ~]# tail -f /var/log/keepalived.log
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五、部署kubeadm/kubelet

1）添加kubernetes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
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2）安装kubeadm

由于版本更新频繁，这里指定版本号部署：

yum install -y kubelet-1.25.0 kubeadm-1.25.0 kubectl-1.25.0
systemctl statrt  kubelet
systemctl enable  kubelet
kubelet --version
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3）测试（部署kubeadm可测）

#下载镜像检测containerd是否正常：
crictl  pull docker.io/library/nginx:alpine
crictl  images ls
crictl  rmi docker.io/library/nginx:alpine 

#查看是否生效(如果显示了镜像加速地址（路径）则代表生效)
crictl info|grep  -A 5 registry
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六、部署Kubernetes Master

1）部署kubeadm

kubeadm init \
    --kubernetes-version v1.25.0 \
    --image-repository registry.aliyuncs.com/google_containers \
    --service-cidr=172.18.0.0/16      \
    --pod-network-cidr=10.244.0.0/16 \
    --control-plane-endpoint=192.168.4.100:6443 \
    --cri-socket=/run/containerd/containerd.sock \
    --upload-certs \
    --v=5
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选项说明：

• –image-repository：选择用于拉取镜像的镜像仓库（默认为“k8s.gcr.io” ）
• –kubernetes-version：选择特定的Kubernetes版本（默认为“stable-1”）
• –service-cidr：为服务的VIP指定使用的IP地址范围（默认为“10.96.0.0/12”）
• –pod-network-cidr：指定Pod网络的IP地址范围。如果设置，则将自动为每个节点分配CIDR。
• –cri-socket：指定cri为containerd

# 要开始使用集群，您需要以常规用户身份运行以下命令
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

# 或者，如果您是root用户，则可以运行允许命令
export KUBECONFIG=/etc/kubernetes/admin.conf

# 加入.bashrc，方便以后连接服务器自动执行
echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >>/root/.bashrc
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• master2和master3添加

kubeadm join 192.168.4.100:6443 --token dggl7z.ghw4vace28dranzt \
	--discovery-token-ca-cert-hash sha256:256d6629de1416cddefe77fd4e3a12147d23ee391213b726949cf52975082fd1 \
	--control-plane --certificate-key c84c4161c3895904819fb457280da98a3bac58ed389cde14e8825b45d4741b89
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2）安装自动补全

# 配置自动补全命令（三台都需要操作）
 yum -y install bash-completion
# 设置kubectl与kubeadm命令补全，下次login生效
 kubectl completion bash > /etc/bash_completion.d/kubectl
 kubeadm completion bash > /etc/bash_completion.d/kubeadm
#退出重新登录生效
 exit
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3）数据目录修改

• https://blog.csdn.net/qq_39826987/article/details/126473129?spm=1001.2014.3001.5502

七、添加Node节点

• 在192.168.4.114/115/118（Node）执行。

#向集群添加新节点，执行在kubeadm init输出的kubeadm join命令
kubeadm join 192.168.4.100:6443 --token dggl7z.ghw4vace28dranzt \
	--discovery-token-ca-cert-hash sha256:256d6629de1416cddefe77fd4e3a12147d23ee391213b726949cf52975082fd1 
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[root@k8s-master1 ~]# kubectl get nodes
NAME          STATUS     ROLES           AGE     VERSION
k8s-master1   NotReady   control-plane   2m31s   v1.25.0
k8s-master2   NotReady             28s     v1.25.0
k8s-master3   NotReady             25s     v1.25.0
k8s-node1     NotReady             87s     v1.25.0
k8s-node2     NotReady             97s     v1.25.0
k8s-node3     NotReady             95s     v1.25.0

[root@k8s-master1 ~]# kubectl get cs
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME                 STATUS    MESSAGE                         ERROR
controller-manager   Healthy   ok                              
scheduler            Healthy   ok                              
etcd-0               Healthy   {"health":"true","reason":""}   
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#默认token有效期为24小时，当过期之后，该token就不可用了。这时就需要重新创建token，可以直接使用命令快捷生成：
kubeadm token create --print-join-command
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【参考添加节点】

• https://kubernetes.io/docs/reference/setup-tools/kubeadm/kubeadm-join/

八、部署容器网络（CNI）

1）官网

https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/#pod-network

注意：只需要部署下面其中一个，推荐Calico。

Calico是一个纯三层的数据中心网络方案，Calico支持广泛的平台，包括Kubernetes、OpenStack等。

Calico 在每一个计算节点利用 Linux Kernel 实现了一个高效的虚拟路由器（ vRouter） 来负责数据转发，而每个 vRouter 通过 BGP 协议负责把自己上运行的 workload 的路由信息向整个 Calico 网络内传播。

此外，Calico 项目还实现了 Kubernetes 网络策略，提供ACL功能。

【官方说明】

• https://docs.projectcalico.org/getting-started/kubernetes/quickstart

【git地址】

• https://github.com/projectcalico/calico

【部署地址】

• https://docs.tigera.io/archive/v3.25/manifests/calico.yaml

【说明】

• https://blog.csdn.net/ma_jiang/article/details/124962352

2）部署修改

# --no-check-certificate
wget https://docs.tigera.io/archive/v3.25/manifests/calico.yaml --no-check-certificate
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下载完后还需要修改里面定义Pod网络（CALICO_IPV4POOL_CIDR），与前面kubeadm init指定的一样

修改完后应用清单：

#修改为：
            - name: CALICO_IPV4POOL_CIDR
              value: "10.244.0.0/16"


                  key: calico_backend
            # Cluster type to identify the deployment type
            - name: CLUSTER_TYPE
              value: "k8s,bgp"
            # 下方新增
            - name: IP_AUTODETECTION_METHOD
              value: "interface=ens160"
    # ens160为本地网卡名字             
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3）更换模式为bgp

#修改CALICO_IPV4POOL_IPIP为Never，不过这种方式只适用于第一次部署，也就是如果已经部署了IPIP模式，这种方式就不奏效了，除非把calico删除，修改。
#更改IPIP模式为bgp模式，可以提高网速，但是节点之前相互不能通信。
            - name: CALICO_IPV4POOL_IPIP
              value: "Always"
#修改yaml
            - name: CALICO_IPV4POOL_IPIP
              value: "Never"
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【报错】Warning: policy/v1beta1 PodDisruptionBudget is deprecated in v1.21+, unavailable in v1.25+; use policy/v1 PodDisruptionBudget

【原因】api版本已经过期，需要修改下。
将apiVersion: policy/v1beta1 修改为apiVersion: policy/v1
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【报错】
 Failed to create pod sandbox: rpc error: code = Unknown desc = failed to setup network for sandbox "0b2f62ae0e97048b9d2b94bd5b2642fd49d1bc977c8db06493d66d1483c6cf45": plugin type="calico" failed (add): stat /var/lib/calico/nodename: no such file or directory: check that the calico/node container is running and has mounted /var/lib/calico/
 【解决】
 # 下方熙增新增
  - name: IP_AUTODETECTION_METHOD
    value: "interface=ens160"
    # ens160为本地网卡名字
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#更换镜像
#:%s/docker.io/docker.m.daocloud.io/g

#拉取镜像
crictl pull docker.io/calico/cni:v3.25.0
crictl pull docker.io/calico/node:v3.25.0
crictl pull docker.io/calico/kube-controllers:v3.25.0

#生效
kubectl apply -f calico.yaml
kubectl get pods -n kube-system
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4）更改网络模式为ipvs

• 升级之前先确定内核版本为5

#修改网络模式为IPVS
[root@k8s-master ~]# kubectl edit -n kube-system cm kube-proxy
修改：将mode: " "
修改为mode: “ipvs”
:wq保存退出

#看kube-system命名空间下的kube-proxy并删除，删除后，k8s会自动再次生成，新生成的kube-proxy会采用刚刚配置的ipvs模式
kubectl get pod -n kube-system |grep kube-proxy |awk '{system("kubectl delete pod "$1" -n kube-system")}'

#清除防火墙规则
iptables -t filter -F; iptables -t filter -X; iptables -t nat -F; iptables -t nat -X;
systemctl restart containerd

#查看日志，确认使用的是ipvs，下面的命令，将proxy的名字换成自己查询出来的名字即可
[root@k8s-master ~]# kubectl get pod -n kube-system | grep kube-proxy
kube-proxy-2bvgz                           1/1     Running   0              34s
kube-proxy-hkctn                           1/1     Running   0              35s
kube-proxy-pjf5j                           1/1     Running   0              38s
kube-proxy-t5qbc                           1/1     Running   0              36s
[root@k8s-master ~]# kubectl logs -n kube-system kube-proxy-pjf5j
I0303 04:32:34.613408       1 node.go:163] Successfully retrieved node IP: 192.168.50.116
I0303 04:32:34.613505       1 server_others.go:138] "Detected node IP" address="192.168.50.116"
I0303 04:32:34.656137       1 server_others.go:269] "Using ipvs Proxier"
I0303 04:32:34.656170       1 server_others.go:271] "Creating dualStackProxier for ipvs"

#通过ipvsadm命令查看是否正常，判断ipvs开启了
[root@k8s-master ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  172.17.0.1:32684 rr
  -> 10.244.36.65:80              Masq    1      0          0         
TCP  192.168.50.114:32684 rr
  -> 10.244.36.65:80              Masq    1      0          0         
TCP  10.96.0.1:443 rr
  -> 192.168.50.114:6443          Masq    1      0          0         
TCP  10.96.0.10:53 rr
  -> 10.244.36.64:53              Masq    1      0          0         
  -> 10.244.169.128:53            Masq    1      0          0         
TCP  10.96.0.10:9153 rr
  -> 10.244.36.64:9153            Masq    1      0          0         
  -> 10.244.169.128:9153          Masq    1      0          0         
TCP  10.105.5.170:80 rr
  -> 10.244.36.65:80              Masq    1      0          0         
UDP  10.96.0.10:53 rr
  -> 10.244.36.64:53              Masq    1      0          0         
  -> 10.244.169.128:53            Masq    1      0          0         
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5）kube-promethues坑

服务暴露分为两种方式，可以使用ingress或NodePort的方式将服务暴露出去使宿主机可以进行访问。注意如果集群使用的如果是calico网络的话会默认创建出若干条网络规则导致服务暴露后也无法在客户端进行访问。可将网络策略修改或直接删除。

root@master01:~# kubectl get networkpolicies.networking.k8s.io -n monitoring 
NAME                  POD-SELECTOR                                                                                                                                             AGE
alertmanager-main     app.kubernetes.io/component=alert-router,app.kubernetes.io/instance=main,app.kubernetes.io/name=alertmanager,app.kubernetes.io/part-of=kube-prometheus   14h
blackbox-exporter     app.kubernetes.io/component=exporter,app.kubernetes.io/name=blackbox-exporter,app.kubernetes.io/part-of=kube-prometheus                                  14h
grafana               app.kubernetes.io/component=grafana,app.kubernetes.io/name=grafana,app.kubernetes.io/part-of=kube-prometheus                                             14h
kube-state-metrics    app.kubernetes.io/component=exporter,app.kubernetes.io/name=kube-state-metrics,app.kubernetes.io/part-of=kube-prometheus                                 14h
node-exporter         app.kubernetes.io/component=exporter,app.kubernetes.io/name=node-exporter,app.kubernetes.io/part-of=kube-prometheus                                      14h
prometheus-adapter    app.kubernetes.io/component=metrics-adapter,app.kubernetes.io/name=prometheus-adapter,app.kubernetes.io/part-of=kube-prometheus                          14h
prometheus-operator   app.kubernetes.io/component=controller,app.kubernetes.io/name=prometheus-operator,app.kubernetes.io/part-of=kube-prometheus                              14h
root@master01:~# kubectl delete networkpolicies.networking.k8s.io  grafana -n monitoring 
networkpolicy.networking.k8s.io "grafana" deleted
root@master01:~# kubectl delete networkpolicies.networking.k8s.io alertmanager-main -n monitoring 
networkpolicy.networking.k8s.io "alertmanager-main" deleted
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• 注：在release-0.11版本之后新增了NetworkPolicy
• 默认是允许自己访问，如果了解NetworkPolicy可以修改一下默认的规则，可以用查看 ls networkPolicy，如果不修改的话则会影响到修改NodePort类型也无法访问
• 如果不会Networkpolicy可以直接删除就行

九、测试kubernetes集群

• 验证Pod工作
• 验证Pod网络通信
• 验证DNS解析

在Kubernetes集群中创建一个pod，验证是否正常运行：

kubectl create deployment nginx --image=nginx:
kubectl expose deployment nginx --port=80 --type=NodePort
kubectl get pod,svc
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访问地址：http://NodeIP:Port

#查看日志
journalctl -u kube-scheduler 
journalctl -xefu kubelet #实时刷新
journalctl -u kube-apiserver 
journalctl -u kubelet |tail
journalctl -xe
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【参考】https://blog.csdn.net/agonie201218/article/details/127878279

十、部署 Dashboard

wget https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.3/aio/deploy/recommended.yaml
1

默认Dashboard只能集群内部访问，修改Service为NodePort类型，暴露到外部：

$ vi recommended.yaml
...
kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  ports:
    - port: 443
      targetPort: 8443
      nodePort: 30000
  selector:
    k8s-app: kubernetes-dashboard
  type: NodePort
...

$ kubectl apply -f recommended.yaml
$ kubectl get pods -n kubernetes-dashboard
NAME                                         READY   STATUS    RESTARTS   AGE
dashboard-metrics-scraper-6b4884c9d5-gl8nr   1/1     Running   0          13m
kubernetes-dashboard-7f99b75bf4-89cds        1/1     Running   0          13m
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访问地址：https://NodeIP:30000

创建service account并绑定默认cluster-admin管理员集群角色：

# 创建用户
kubectl create serviceaccount dashboard-admin -n kube-system
# 用户授权
kubectl create clusterrolebinding dashboard-admin --clusterrole=cluster-admin --serviceaccount=kube-system:dashboard-admin
#解决WEB页面报错
kubectl create clusterrolebinding system:anonymous   --clusterrole=cluster-admin  --user=system:anonymous
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#访问：https://node节点:30000/

https://192.168.4.115:30000/

# 获取用户Token
kubectl describe secrets -n kube-system $(kubectl -n kube-system get secret | awk '/dashboard-admin/{print $1}')
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使用输出的token登录Dashboard。

十一、解决谷歌不能登录dashboard

#查看
kubectl get secrets  -n  kubernetes-dashboard

#删除默认的secret，用自签证书创建新的secret
kubectl delete secret kubernetes-dashboard-certs -n kubernetes-dashboard

#创建ca
openssl genrsa -out ca.key 2048
openssl req -new -x509 -key ca.key -out ca.crt -days 3650 -subj "/C=CN/ST=HB/L=WH/O=DM/OU=YPT/CN=CA"
openssl x509 -in ca.crt -noout -text

#签发Dashboard证书
openssl genrsa -out dashboard.key 2048
openssl req -new -key dashboard.key -out dashboard.csr -subj "/O=white/CN=dasnboard"
openssl x509 -req -in dashboard.csr  -CA ca.crt -CAkey ca.key -CAcreateserial -out dashboard.crt -days 3650


#生成新的secret
kubectl create secret generic kubernetes-dashboard-certs  --from-file=dashboard.crt=/opt/dashboard/dashboard.crt --from-file=dashboard.key=/opt/dashboard/dashboard.key -n kubernetes-dashboard

# 删除默认的secret，用自签证书创建新的secret
#kubectl create secret generic #kubernetes-dashboard-certs \
#--from-file=/etc/kubernetes/pki/apiserver.key \
#--from-file=/etc/kubernetes/pki/apiserver.crt \ 
#-n kubernetes-dashboard

# vim recommended.yaml 加入证书路径
          args:
            - --auto-generate-certificates
            - --tls-key-file=dashboard.key
            - --tls-cert-file=dashboard.crt
#           - --tls-key-file=apiserver.key
#           - --tls-cert-file=apiserver.crt

#重新生效
kubectl apply  -f recommended.yaml 

#删除pods重新生效
kubectl get pod -n kubernetes-dashboard | grep -v NAME | awk '{print "kubectl delete po " $1 " -n kubernetes-dashboard"}' | sh
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访问：https://192.168.4.116:30000/#/login

# 获取用户Token
kubectl describe secrets -n kube-system $(kubectl -n kube-system get secret | awk '/dashboard-admin/{print $1}')
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十二、安装metrics

#下载
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/metrics-server:v0.5.0
#改名
docker tag   registry.cn-hangzhou.aliyuncs.com/google_containers/metrics-server:v0.5.0 k8s.gcr.io/metrics-server/metrics-server:v0.5.0
#删除已经改名镜像
docker rmi -f registry.cn-hangzhou.aliyuncs.com/google_containers/metrics-server:v0.5.0
#创建目录
mkdir -p /opt/k8s/metrics-server
cd /opt/k8s/metrics-server
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apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    k8s-app: metrics-server
    rbac.authorization.k8s.io/aggregate-to-admin: "true"
    rbac.authorization.k8s.io/aggregate-to-edit: "true"
    rbac.authorization.k8s.io/aggregate-to-view: "true"
  name: system:aggregated-metrics-reader
rules:
- apiGroups:
  - metrics.k8s.io
  resources:
  - pods
  - nodes
  verbs:
  - get
  - list
  - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    k8s-app: metrics-server
  name: system:metrics-server
rules:
- apiGroups:
  - ""
  resources:
  - pods
  - nodes
  - nodes/stats
  - namespaces
  - configmaps
  verbs:
  - get
  - list
  - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server-auth-reader
  namespace: kube-system
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: extension-apiserver-authentication-reader
subjects:
- kind: ServiceAccount
  name: metrics-server
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server:system:auth-delegator
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:auth-delegator
subjects:
- kind: ServiceAccount
  name: metrics-server
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  labels:
    k8s-app: metrics-server
  name: system:metrics-server
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:metrics-server
subjects:
- kind: ServiceAccount
  name: metrics-server
  namespace: kube-system
---
apiVersion: v1
kind: Service
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server
  namespace: kube-system
spec:
  ports:
  - name: https
    port: 443
    protocol: TCP
    targetPort: https
  selector:
    k8s-app: metrics-server
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server
  namespace: kube-system
spec:
  selector:
    matchLabels:
      k8s-app: metrics-server
  strategy:
    rollingUpdate:
      maxUnavailable: 0
  template:
    metadata:
      labels:
        k8s-app: metrics-server
    spec:
      containers:
      - args:
        - --cert-dir=/tmp
        - --secure-port=443
        - --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
        - --kubelet-use-node-status-port
        - --metric-resolution=15s
        - --kubelet-insecure-tls
        image: k8s.gcr.io/metrics-server/metrics-server:v0.5.0
        imagePullPolicy: IfNotPresent
        livenessProbe:
          failureThreshold: 3
          httpGet:
            path: /livez
            port: https
            scheme: HTTPS
          periodSeconds: 10
        name: metrics-server
        ports:
        - containerPort: 443
          name: https
          protocol: TCP
        readinessProbe:
          failureThreshold: 3
          httpGet:
            path: /readyz
            port: https
            scheme: HTTPS
          initialDelaySeconds: 20
          periodSeconds: 10
        resources:
          requests:
            cpu: 100m
            memory: 200Mi
        securityContext:
          readOnlyRootFilesystem: true
          runAsNonRoot: true
          runAsUser: 1000
        volumeMounts:
        - mountPath: /tmp
          name: tmp-dir
      nodeSelector:
        kubernetes.io/os: linux
      priorityClassName: system-cluster-critical
      serviceAccountName: metrics-server
      volumes:
      - emptyDir: {}
        name: tmp-dir
---
apiVersion: apiregistration.k8s.io/v1
kind: APIService
metadata:
  labels:
    k8s-app: metrics-server
  name: v1beta1.metrics.k8s.io
spec:
  group: metrics.k8s.io
  groupPriorityMinimum: 100
  insecureSkipTLSVerify: true
  service:
    name: metrics-server
    namespace: kube-system
  version: v1beta1
  versionPriority: 100

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十三、crictl管理容器

crictl 是 CRI 兼容的容器运行时命令行接口。 你可以使用它来检查和调试 Kubernetes 节点上的容器运行时和应用程序。 crictl 和它的源代码在 cri-tools 代码库。

【视频】https://asciinema.org/a/179047

【使用网址】https://kubernetes.io/zh/docs/tasks/debug-application-cluster/crictl/

十四、常用命令

1、常用命令

#查看master组件状态：
kubectl get cs

#查看node状态：
kubectl get node

#查看Apiserver代理的URL：
kubectl cluster-info

#查看集群详细信息：
kubectl cluster-info dump

#查看资源信息：
kubectl describe <资源> <名称>

#查看K8S信息
kubectl api-resources
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2、命令操作+

[root@k8s-master ~]# kubectl get cs
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME                 STATUS      MESSAGE                                                                                       ERROR
scheduler            Unhealthy   Get "http://127.0.0.1:10251/healthz": dial tcp 127.0.0.1:10251: connect: connection refused
controller-manager   Unhealthy   Get "http://127.0.0.1:10252/healthz": dial tcp 127.0.0.1:10252: connect: connection refused
etcd-0               Healthy     {"health":"true"}
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#修改yaml，注释掉port
$ vim /etc/kubernetes/manifests/kube-scheduler.yaml
$ vim /etc/kubernetes/manifests/kube-controller-manager.yaml
#    - --port=0

#重启
systemctl restart kubelet

#查看master组件
[root@k8s-master ~]# kubectl get cs
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME                 STATUS    MESSAGE             ERROR
controller-manager   Healthy   ok
scheduler            Healthy   ok
etcd-0               Healthy   {"health":"true"}

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命令区别

十五、kube-promethues使用坑

服务暴露分为两种方式，可以使用ingress或NodePort的方式将服务暴露出去使宿主机可以进行访问。注意如果集群使用的如果是calico网络的话会默认创建出若干条网络规则导致服务暴露后也无法在客户端进行访问。可将网络策略修改或直接删除。

root@master01:~# kubectl get networkpolicies.networking.k8s.io -n monitoring 
NAME                  POD-SELECTOR                                                                                                                                             AGE
alertmanager-main     app.kubernetes.io/component=alert-router,app.kubernetes.io/instance=main,app.kubernetes.io/name=alertmanager,app.kubernetes.io/part-of=kube-prometheus   14h
blackbox-exporter     app.kubernetes.io/component=exporter,app.kubernetes.io/name=blackbox-exporter,app.kubernetes.io/part-of=kube-prometheus                                  14h
grafana               app.kubernetes.io/component=grafana,app.kubernetes.io/name=grafana,app.kubernetes.io/part-of=kube-prometheus                                             14h
kube-state-metrics    app.kubernetes.io/component=exporter,app.kubernetes.io/name=kube-state-metrics,app.kubernetes.io/part-of=kube-prometheus                                 14h
node-exporter         app.kubernetes.io/component=exporter,app.kubernetes.io/name=node-exporter,app.kubernetes.io/part-of=kube-prometheus                                      14h
prometheus-adapter    app.kubernetes.io/component=metrics-adapter,app.kubernetes.io/name=prometheus-adapter,app.kubernetes.io/part-of=kube-prometheus                          14h
prometheus-operator   app.kubernetes.io/component=controller,app.kubernetes.io/name=prometheus-operator,app.kubernetes.io/part-of=kube-prometheus                              14h
root@master01:~# kubectl delete networkpolicies.networking.k8s.io  grafana -n monitoring 
networkpolicy.networking.k8s.io "grafana" deleted
root@master01:~# kubectl delete networkpolicies.networking.k8s.io alertmanager-main -n monitoring 
networkpolicy.networking.k8s.io "alertmanager-main" deleted
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• 注：在release-0.11版本之后新增了NetworkPolicy
• 默认是允许自己访问，如果了解NetworkPolicy可以修改一下默认的规则，可以用查看 ls networkPolicy，如果不修改的话则会影响到修改NodePort类型也无法访问
• 如果不会Networkpolicy可以直接删除就行