## # 制作标准机镜像

通过使用标准机镜像，可以

- 避免重复执行对测试机安装必要软件的过程
- 以一种相对标准化的过程管理测试机的维护

标准机镜像中预装了如下内容：

- docker
- gitlab-runner
- kubernetes images

本文档描述的安装过程已基于 centos 7.6 验证

标准机镜像的制作过程描述如下：

### # 安装docker

卸载旧版本

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

下载依赖包及安装包

    wget https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm

    wget https://download.docker.com/linux/centos/7/x86_64/stable/Packages/docker-ce-cli-18.09.7-3.el7.x86_64.rpm

    wget https://download.docker.com/linux/centos/7/x86_64/stable/Packages/docker-ce-18.09.7-3.el7.x86_64.rpm

安装

    sudo yum install -y containerd.io-1.2.6-3.3.el7.x86_64.rpm
    sudo yum install -y docker-ce-cli-18.09.7-3.el7.x86_64.rpm
    sudo yum install -y docker-ce-18.09.7-3.el7.x86_64.rpm
    sudo systemctl enable docker

启动 docker 服务

    sudo systemctl start docker

检查 docker 版本

    docker version

参考文档

https://docs.docker.com/install/linux/docker-ce/centos/

https://docs.docker.com/install/linux/linux-postinstall/

### # 安装 nfs-utils

执行安装命令

    sudo yum install nfs-utils

必须先安装 nfs-utils 才能挂载 nfs 网络存储

### # K8S基本配置

配置K8S的yum源

    cat <<EOF > /etc/yum.repos.d/kubernetes.repo
    [kubernetes]
    name=Kubernetes
    baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
    enabled=1
    gpgcheck=0
    repo_gpgcheck=0
    gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
            http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
    EOF

关闭swap、防火墙

    swapoff -a

关闭SeLinux

    setenforce 0

修改 /etc/sysctl.conf

`vim /etc/sysctl.conf`

向其中添加

    net.ipv4.ip_forward = 1
    net.bridge.bridge-nf-call-ip6tables = 1
    net.bridge.bridge-nf-call-iptables = 1

如下图所示

安装kubelet、kubeadm、kubectl

    yum install -y kubelet-1.15.0 kubeadm-1.15.0 kubectl-1.15.0

修改docker Cgroup Driver为systemd

`vim /usr/lib/systemd/system/docker.service`

向其中他添加

`--exec-opt native.cgroupdriver=systemd`

如下图所示

重启 docker

    systemctl daemon-reload
    systemctl restart docker

启动kubelet

    systemctl enable kubelet && systemctl start kubelet

加载 kubernetes 镜像

由于k8s服务相关镜像在国外镜像源，国内无法访问

执行以下命令添加docker k8s国内镜像源

    curl -sSL https://get.daocloud.io/daotools/set_mirror.sh | sh -s http://f1361db2.m.daocloud.io

    systemctl restart docker

拉取k8s相关镜像

    docker pull mirrorgooglecontainers/kube-apiserver:v1.15.0
    docker pull mirrorgooglecontainers/kube-controller-manager:v1.15.0
    docker pull mirrorgooglecontainers/kube-scheduler:v1.15.0
    docker pull mirrorgooglecontainers/kube-proxy:v1.15.0
    docker pull mirrorgooglecontainers/pause:3.1
    docker pull mirrorgooglecontainers/etcd:3.3.10
    docker pull coredns/coredns:1.3.1

更改镜像名为k8s官网镜像

    docker tag d235b23c3570 k8s.gcr.io/kube-proxy:v1.15.0
    docker tag 201c7a840312 k8s.gcr.io/kube-apiserver:v1.15.0
    docker tag 2d3813851e87 k8s.gcr.io/kube-scheduler:v1.15.0
    docker tag 8328bb49b652 k8s.gcr.io/kube-controller-manager:v1.15.0
    docker tag da86e6ba6ca1 k8s.gcr.io/pause:3.1
    docker tag eb516548c180 k8s.gcr.io/coredns:1.3.1
    docker tag 2c4adeb21b4f k8s.gcr.io/etcd:3.3.10

制作镜像

请参考阿里云基于ECS 制作虚拟机镜像
的文档