Building a cloud-native DevOps environment

Docker安装

1.移除以前docker相关包

sudo yum remove docker \
docker-client \
docker-client-latest \
docker-common \
docker-latest \
docker-latest-logrotate \
docker-engine

2.配置yum源

sudo yum install -y yum-utils
sudo yum-config-manager \
--add-repo \
https://download.docker.com/linux/centos/docker-ce.repo

3.安装docker

sudo yum install -y docker-ce docker-ce-cli containerd.io

4.启动

systemctl enable docker --now

5.配置加速

sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF' { "registry-mirrors": ["https://82m9ar63.mirror.aliyuncs.com"], "exec-opts": ["native.cgroupdriver=systemd"], "log-driver": "json-file", "log-opts": { "max-size": "100m" }, "storage-driver": "overlay2" } EOF
sudo systemctl daemon-reload
sudo systemctl restart docker

Dockerfile构建Java应用镜像

FROM openjdk:8-jdk-slim
#作者
LABEL maintainer=xxx
#复制targer目录下的jarsmall to mediumlinux系统里
COPY target/*jar /app.jar
#应用启动命令
ENTRYPOINT ["java","-jar","/app.jar"]

Kubernetes集群搭建

1. All machine networks in the cluster can connect to each other
2. All node hostnames cannot be duplicated
3. 禁用交换分区

#各个机器设置自己的域名
hostnamectl set-hostname xxxx


# 将 SELinux 设置为 permissive 模式（相当于将其禁用）
sudo setenforce 0
sudo sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config

#关闭swap
swapoff -a  
sed -ri 's/.*swap.*/#&/' /etc/fstab

#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