k8s优化-前置环境配置centos7

http://mirror.centos.org/centos/7/os/x86_64/Packages/socat-1.7.3.2-2.el7.x86_64.rpm
https://blog.csdn.net/qq_41472891/article/details/123016824
•安装步骤
yum -y install ntpdate
ntpdate time.windows.com
systemctl stop firewalld
systemctl disable firewalld
sed -i ‘s/enforcing/disabled/’ /etc/selinux/config
setenforce 0
sed -ri ‘s/.swap./#&/’ /etc/fstab
cat > /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF
sudo sysctl --system

rpm -ivh socat-1.7.3.2-2.el7.x86_64.rpm

++++++++++++++++

step 1: 安装必要的一些系统工具

sudo yum install -y yum-utils device-mapper-persistent-data lvm2

sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

sudo yum makecache fast
sudo yum -y install docker-ce

sudo systemctl start docker
sudo systemctl enable docker
sed -i “13i ExecStartPost=/usr/sbin/iptables -P FORWARD ACCEPT” /usr/lib/systemd/system/docker.service

一般在国内无法访问k8s.gcr.io，所以需要配置国内镜像托管站点

Kubernetes 默认设置cgroup驱动位为 “systemd” ，而 Docker 服务的cgroup驱动默认为 “cgroupfs”, 建议将其修改为 “systemd", 与 Kubernetes 保持一致

tee /etc/docker/daemon.json <<-‘EOF’
{
“registry-mirrors”: [“https://bk6kzfqm.mirror.aliyuncs.com”],
“exec-opts”: [“native.cgroupdriver=systemd”],
“log-driver”: “json-file”,
“log-opts”: {
“max-size”: “100m”
},
“storage-driver”: “overlay2”,
“storage-opts”: [
“overlay2.override_kernel_check=true”
]
}
EOF
systemctl daemon-reload
systemctl restart docker

配置yum源（国内）,根据需要选择合适的源

cat < /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
exclude=kubelet kubeadm kubectl
EOF