K8S安装笔记（一）—— master节点完整安装配置
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一、基础环境配置
1.1 关闭防火墙
systemctl stop firewalld && systemctl disable firewalld
1.2 关闭selinux
sed -i 's/enforcing/disabled/' /etc/selinux/config # 永久
setenforce 0 # 临时
1.3 关闭swap
# 临时
swapoff -a
# 永久
echo vm.swappiness=0 >> /etc/sysctl.conf
sysctl -p
1.4 关设置主机名
hostname # 查看本机hostname
hostnamectl set-hostname k8s-master # 把本机名设置成k8s-master
hostnamectl status # 查看修改结果
1.5 添加hosts
echo "127.0.0.1 $(hostname)" >> /etc/hosts # 修改hosts文件
1.6 允许 iptables 检查桥接流量
cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
br_netfilter
EOF
cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sudo sysctl --system
二、安装及配置Docker
2.1 安装Docker
yum install wget -y
wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo
yum -y install docker-ce
systemctl enable docker && systemctl start docker
2.2 配置Docker
cat > /etc/docker/daemon.json << EOF
{
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": {
"max-size": "100m"
},
"storage-driver": "overlay2",
"registry-mirrors": ["https://vydiw6v2.mirror.aliyuncs.com"]
}
EOF
systemctl restart docker
三、安装kubeadm，kubelet和kubectl
3.1 添加阿里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
sudo yum install -y kubelet-1.23.0 kubeadm-1.23.0 kubectl-1.23.0 --disableexcludes=kubernetes
sudo systemctl enable --now kubelet
3.2 查看kubelet状态
systemctl status kubelet
通过journalctl制定上图的PID进行查看
journalctl _PID=955 | vim -
此时需初始化master，请进行3.3 步骤操作。
3.3 初始化master
查看网络IP：
执行初始化
kubeadm init \
--apiserver-advertise-address=10.0.24.12 \
--image-repository registry.aliyuncs.com/google_containers \
--kubernetes-version v1.23.0 \
--service-cidr=10.96.0.0/12 \
--pod-network-cidr=10.244.0.0/16 \
--ignore-preflight-errors=all
注意事项：
- 修改
apiserver-advertise-address为自己的master节点IP。
按照提示进行操作：
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
vi /etc/profile
export KUBECONFIG=/etc/kubernetes/admin.conf
source /etc/profile
3.4 集群检查
kubectl get pod -A
3.4.1 0/1 nodes are available: 1 node(s) had taint
kubectl describe pod coredns-6d8c4cb4d-52p88 -n kube-system
警告详情：
Warning FailedScheduling 16s (x10 over 10m) default-scheduler 0/1 nodes are available: 1 node(s) had taint {node.kubernetes.io/not-ready: }, that the pod didn't tolerate.
原因：当创建单机版的
k8s时，这个时候master节点是默认不允许调度pod。
解决方案：直接删除
master节点的污点设置
kubectl taint nodes --all node-role.kubernetes.io/master-
然后就可以正常创建pod了
kubectl get nodes
3.4.2 Unable to update cni config: no networks found in /etc/cni/net.d
systemctl status kubelet
异常详情：
May 17 16:41:20 k8s-master kubelet[3536]: E0517 16:41:20.156256 3536 kubelet.go:2347] "Container runtime network not ready" networkReady="NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin i...ig uninitialized"
May 17 16:41:22 k8s-master kubelet[3536]: I0517 16:41:22.946145 3536 cni.go:240] "Unable to update cni config" err="no networks found in /etc/cni/net.d"
原因：有安装网络插件，导致
coredns是Pending状态
官网介绍：https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/troubleshooting-kubeadm/
解决方案：下载 kube-flannel.yml进行安装
- 安装Calico网络插件
#下载yaml文件
curl https://docs.projectcalico.org/manifests/calico.yaml -O
#使用kubectl apply应用刚刚下载好的calico.yaml文件。
kubectl apply -f calico.yaml
#查看当前k8s集群得pods
kubectl get pods -o wide -n kube-system
- 安装kube-flannel网络插件
#下载yaml文件
wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
#使用kubectl apply应用刚刚下载好的calico.yaml文件。
kubectl apply -f kube-flannel.yml
#查看当前k8s集群的pods(一个pod内运行了多个docker容器，-n表命名空间)
kubectl get pods -o wide -n kube-system
kubectl get pods -n kube-system
此时查看集群节点状态
kubectl get nodes
四、安装
4.1 执行 Kuboard v3 在 K8S 中的安装
kubectl apply -f https://addons.kuboard.cn/kuboard/kuboard-v3.yaml
# 您也可以使用下面的指令，唯一的区别是，该指令使用华为云的镜像仓库替代 docker hub 分发 Kuboard 所需要的镜像
# kubectl apply -f https://addons.kuboard.cn/kuboard/kuboard-v3-swr.yaml
参照官网地址：https://kuboard.cn/install/v3/install-in-k8s.html#%E5%AE%89%E8%A3%85
等待 Kuboard v3 就绪，执行指令 watch kubectl get pods -n kuboard，等待 kuboard 名称空间中所有的 Pod 就绪，如下所示：
[root@VM-24-12-centos ~]# kubectl get pods -n kuboard
NAME READY STATUS RESTARTS AGE
kuboard-agent-2-5c5f64fbbb-8scbk 1/1 Running 0 2m37s
kuboard-agent-7cf96956c8-wjnjs 1/1 Running 1 (2m11s ago) 2m37s
kuboard-etcd-7k8mw 1/1 Running 0 3m36s
kuboard-questdb-77f4c698cc-2w5jq 1/1 Running 0 2m36s
kuboard-v3-56b4b954c9-72kqh 1/1 Running 0 3m36s
[root@VM-24-12-centos ~]# kubectl describe pod kuboard-v3-56b4b954c9-72kqh -n kuboard
Name: kuboard-v3-56b4b954c9-72kqh
Namespace: kuboard
Priority: 0
Node: k8s-master/10.0.24.12
Start Time: Tue, 17 May 2022 17:05:23 +0800
Labels: k8s.kuboard.cn/name=kuboard-v3
pod-template-hash=56b4b954c9
Annotations: <none>
Status: Running
IP: 10.244.0.4
IPs:
IP: 10.244.0.4
Controlled By: ReplicaSet/kuboard-v3-56b4b954c9
Containers:
kuboard:
Container ID: docker://8f7928f326027e1b227d45f22b648aade2f075d38a970fecb6dd76092fe06e05
Image: eipwork/kuboard:v3
Image ID: docker-pullable://eipwork/kuboard@sha256:0ea7d38afa2bb31ae178f8dc32feeccd480376097a2e3b7423750d02f123fa8c
Ports: 80/TCP, 443/TCP, 10081/TCP, 10081/UDP
Host Ports: 0/TCP, 0/TCP, 0/TCP, 0/UDP
State: Running
Started: Tue, 17 May 2022 17:06:04 +0800
Ready: True
Restart Count: 0
Liveness: http-get http://:80/kuboard-resources/version.json delay=30s timeout=1s period=10s #success=1 #failure=3
Readiness: http-get http://:80/kuboard-resources/version.json delay=30s timeout=1s period=10s #success=1 #failure=3
Environment Variables from:
kuboard-v3-config ConfigMap Optional: false
Environment:
HOSTIP: (v1:status.hostIP)
HOSTNAME: (v1:spec.nodeName)
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-zl646 (ro)
Conditions:
Type Status
Initialized True
Ready True
ContainersReady True
PodScheduled True
Volumes:
kube-api-access-zl646:
Type: Projected (a volume that contains injected data from multiple sources)
TokenExpirationSeconds: 3607
ConfigMapName: kube-root-ca.crt
ConfigMapOptional: <nil>
DownwardAPI: true
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node-role.kubernetes.io/master op=Exists
node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 3m40s default-scheduler Successfully assigned kuboard/kuboard-v3-56b4b954c9-72kqh to k8s-master
Normal Pulling 3m39s kubelet Pulling image "eipwork/kuboard:v3"
Normal Pulled 2m59s kubelet Successfully pulled image "eipwork/kuboard:v3" in 39.749208341s
Normal Created 2m59s kubelet Created container kuboard
Normal Started 2m59s kubelet Started container kuboard
[root@VM-24-12-centos ~]#
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