二. k8s安装过程

男娘i 2023-08-17 16:33 115阅读 0赞

*  k8s安装过程
    
     *  关掉selinux firewalld iptables
     *  修改hosts文件主机名解析
     *  修改docker参数
     *  编辑kubelet的配置文件/etc/sysconfig/kubelet
     *  修改内核参数
     *  设置docker和kubelet为自启动
     *  集群初始化以及加入新节点
     *  安装网络组件flannel

## k8s安装过程 ##

### 关掉selinux firewalld iptables ###

yum install docker-ce kubelet kubeadm kubectl \#kubectl在node端可以不装

source <(kubectl completion bash)
    echo "source <(kubectl completion bash)" >> ~/.bashrc

### 修改hosts文件主机名解析 ###

10.0.0.50 master
    10.0.0.51 node01
    10.0.0.52 node02

### 修改docker参数 ###

cat > /etc/docker/daemon.json << EOF
    {
      "exec-opts": ["native.cgroupdriver=systemd"],
      "registry-mirrors": ["https://wxarz6o9.mirror.aliyuncs.com"]
    }
    EOF
    
    systemctl daemon-reload
    systemctl restart docker

### 编辑kubelet的配置文件/etc/sysconfig/kubelet ###

KUBELET_EXTRA_ARGS="--fail-swap-on=false"
    KUBE_PROXY_MODE=ipvs

cat > /etc/sysconfig/modules/ipvs.modules <<EOF
    #!/bin/bash
    modprobe -- ip_vs
    modprobe -- ip_vs_rr
    modprobe -- ip_vs_wrr
    modprobe -- ip_vs_sh
    modprobe -- nf_conntrack_ipv4
    EOF
    chmod 755 /etc/sysconfig/modules/ipvs.modules
    bash /etc/sysconfig/modules/ipvs.modules
    lsmod|egrep "ip_vs|nf_conntrack_ipv4"

### 修改内核参数 ###

[root@master ~]# tail -3 /etc/sysctl.conf
    net.bridge.bridge-nf-call-ip6tables = 1
    net.bridge.bridge-nf-call-iptables = 1
    net.ipv4.ip_forward = 1
    
    modprobe br_netfilter
    sysctl -p

### 设置docker和kubelet为自启动 ###

systemctl enable kubelet #初始化工作完成前 kubelet不能启动
    systemctl enable docker.service

images=(
    kube-apiserver:v1.15.3
    kube-controller-manager:v1.15.3
    kube-scheduler:v1.15.3
    kube-proxy:v1.15.3
    pause:3.1
    etcd:3.3.10
    coredns:1.3.1
    )
    
    for imageName in ${images[@]} ; do
        docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/$imageName
        docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/$imageName k8s.gcr.io/$imageName
    done
    
    
    # kubeadm config images list 命令执行输出结果
    # I0822 07:35:50.276507   11371 version.go:240] remote version is much newer: v1.15.3; falling back to: stable-1.14
    # k8s.gcr.io/kube-apiserver:v1.14.6
    # k8s.gcr.io/kube-controller-manager:v1.14.6
    # k8s.gcr.io/kube-scheduler:v1.14.6
    # k8s.gcr.io/kube-proxy:v1.14.6
    # k8s.gcr.io/pause:3.1
    # k8s.gcr.io/etcd:3.3.10
    # k8s.gcr.io/coredns:1.3.1

### 集群初始化以及加入新节点 ###

# 初始化k8s集群, 同时初始化pod网络和集群网络. 在master执行
    kubeadm init --kubernetes-version=v1.15.3 --pod-network-cidr=10.244.0.0/16 --service-cidr=10.96.0.0/12 --ignore-preflight-errors=Swap
    # node节点加入集群, 在node节点执行
     kubeadm join 10.0.0.50:6443 --token l8niuw.wbgf792esxrslffi     --discovery-token-ca-cert-hash sha256:bc1c330ec3618d5424e404b6e458a462ad44fc61b70883102f4dc8cd56043cc0  --ignore-preflight-errors=Swap
     
    # master节点执行
    mkdir -p $HOME/.kube
    cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
    chown $(id -u):$(id -g) $HOME/.kube/config

### 安装网络组件flannel ###

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
    
    # node节点执行
    systemctl enable docker.service kubelet.service
    systemctl start docker.service
    
    # node节点需要pause kube-proxy和flannel三个镜像
    
    kubectl get pods -n kube-system -o wide

# 如果发现不能正常拉取flannel，可以参考以下方法
    docker pull quay-mirror.qiniu.com/coreos/flannel:v0.11.0-amd64
    docker tag quay-mirror.qiniu.com/coreos/flannel:v0.11.0-amd64 quay.io/coreos/flannel:v0.11.0-amd64
    kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

***需要保证每个节点都有pause和kube-proxy镜像***

转载于:https://www.cnblogs.com/peitianwang/p/11395034.html