Centos7安装k8s(基于kubeadm)

• Centos7安装k8s(基于kubeadm)
  • 下载相关包
  • Master与Work节点共同步骤
  • 接着Master执行
  • 接着Work节点执行
  • 其他
    • CentOS 7 内核升级
    • 问题

下载相关包

链接：https://pan.baidu.com/s/1H9MuZsf28f_3uyVHBUS8jQ
提取码：w9tv

Master与Work节点共同步骤

先看看ip，然后确定Master与Work节点相通的ip是哪个

ifconfig

修改hosts

hostnamectl set-hostname k8s-1
systemctl restart network
# 把master与work节点都添加到hosts中
echo "172.16.1.65 k8s-1" >> /etc/hosts
echo "172.16.1.66 k8s-2" >> /etc/hosts
ping k8s-1 -c 3
# 没翻墙
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
# 翻墙了的
cat <<EOF > /etc/yum.repos.d/google-kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
EOF
# 关防火墙
systemctl stop firewalld
systemctl disable firewalld
# 设置selinux的参数
sed -ie 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
setenforce 0
# 设置系统具体参数
echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf
echo "net.bridge.bridge-nf-call-ip6tables = 1" >>/etc/sysctl.conf
echo "net.bridge.bridge-nf-call-iptables = 1" >>/etc/sysctl.conf
echo "net.bridge.bridge-nf-call-arptables = 1" >>/etc/sysctl.conf
swapoff -a
sysctl  -p
# 更新
yum update -y
# 安装docker-ce
yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
yum -y install docker-ce
mkdir -p /etc/docker/
cat <<EOF > /etc/docker/daemon.json
{
  "registry-mirrors": ["https://cu2yw19m.mirror.aliyuncs.com"]
}
EOF
# 重启
systemctl daemon-reload
systemctl restart docker
systemctl enable docker
# 安装 kubeadm kubectl kubelet
yum -y install kubeadm-1.20.0 kubectl-1.20.0 kubelet-1.20.0
systemctl restart network
systemctl enable kubelet && systemctl restart kubelet
cat /proc/sys/net/bridge/bridge-nf-call-iptables
cat /proc/sys/net/bridge/bridge-nf-call-ip6tables
# 关闭swap
echo "KUBELET_EXTRA_ARGS="--fail-swap-on=false"" > /etc/sysconfig/kubelet
systemctl restart kubelet
# 到我们解压后的目录下
cd /root/1.20.0/
docker load -i kube-controller-manager.tar
docker load -i kube-apiserver.tar
docker load -i kube-proxy.tar
docker load -i kube-scheduler.tar
docker load -i coredns.tar
docker load -i etcd.tar
docker load -i flannel.tar
docker load -i pause.tar
docker load -i nettoolbox.tar

接着Master执行

# 初始化后，保存join因为需要Work端执行
kubeadm init --kubernetes-version=v1.20.0 --pod-network-cidr=10.244.0.0/16 --service-cidr=10.96.0.0/16 --ignore-preflight-errors=Swap
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
kubectl taint nodes --all node-role.kubernetes.io/master-
# 安装flannel
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
kubectl get nodes -o wide
kubectl get pods  -o wide -n=kube-system
kubectl run nettoolbox --image=burlyluo/nettoolbox --restart=Never
kubectl get pods  -o wide

接着Work节点执行

# 执行复制的join

其他

CentOS 7 内核升级

uname -r
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
yum --enablerepo=elrepo-kernel install kernel-ml-devel kernel-ml -y
grub2-set-default 0
reboot
uname -r

问题

遇到该问题：[Errno -1] repomd.xml signature could not be verified for kubernetes Trying other mirror
解决方法：

#去掉kubernetes.repo文件中的下列两项
gpgcheck=1
repo_gpgcheck=1

遇到Errors during downloading metadata for repository 'base':

# 进入yum目录
cd /etc/yum.repos.d
# 删除目录下所有文件(注意完整复制，不要漏了那个点)
rm -rf ./*
# 安装正确的源
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo
# 生成缓存
yum makecache

Problem: package containers-common-2:1-2.module_el8.5.0 890 6b136101.noarch requires runc, but none of the providers can be installed

dnf -y module disable container-tools

Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist

cd /etc/yum.repos.d
vi CentOS-Linux-BaseOS.repo
vi CentOS-Linux-AppStream.repo

[baseos]
name=CentOS Linux $releasever - BaseOS
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=BaseOS&infra=$infra
#baseurl=http://mirror.centos.org/$contentdir/$releasever/BaseOS/$basearch/os/
baseurl=https://vault.centos.org/centos/$releasever/BaseOS/$basearch/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

[appstream]
name=CentOS Linux $releasever - AppStream
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=AppStream&infra=$infra
#baseurl=http://mirror.centos.org/$contentdir/$releasever/AppStream/$basearch/os/
baseurl=https://vault.centos.org/centos/$releasever/AppStream/$basearch/os/ 
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

RPM: error: db5 error(-30969) from dbenv->open: BDB0091 DB_VERSION_MISMATCH: Database environment version mismatch

cd /var/lib/rpm
ls -a
rm -rf __db.*
rpm --rebuilddb
dnf update