目标:建立一套可持续集成的环境,日常开发以及维护。分几节讲:
初级篇
1、k8s+docker集成
2、jenkins安装和应用( https://www.jianshu.com/p/16fc6cc8ec03)
3、建立私有仓库Registry(https://www.jianshu.com/p/e79e37b34abb)
4、发布部署应用(https://www.jianshu.com/p/64bda4b7899c)
进阶篇
5、安装Gitlab和应用(https://www.jianshu.com/p/340e60d61903)
6、利用GitLab webhook来实现触发Jenkins自动操作(https://www.jianshu.com/p/303e15fc11bd)
7、 Jenkins pipeline自动化运行发布部署(https://www.jianshu.com/p/256181be306a)
8、发布前自动测试+静态扫描(Sonar)的检测(待更新)
....
一、下载安装虚拟工具VirtualBox
地址:https://www.virtualbox.org/wiki/Downloads (选择对应的系统安装包)
二、安装ubuntu系统(Ubuntu 16.04.6 LTS)
镜像地址:http://releases.ubuntu.com/ (先择iso镜像)
三、安装环境
1、打开桥接模式,可以上网
2、打开open-ssh,可以远程连接
安装ssh:
sudo apt-get update
sudo apt-get install ssh
更改配置:
vim /etc/ssh/sshd_config ==> PermitEmptyPasswords yes
将PermitRootLogin 的值改为yes
重启
systemctl restart sshd
设置root密码
sudo passwd root
ssh root@xxx.xxx.xxx.xxx
关闭防火
sudo ufw disable
3、主机分别准备docker & kubernetes环境(3台分别执行)
主机:10.20.17.177
node: 10.20.16.146
node2: 10.20.16.162
安装k8s的时候先把网络设成科学上网,安装包的时候不会报错
# docker安装
sudo apt-get update && sudo apt-get install -y apt-transport-https
sudo apt install -y docker.io
sudo systemctl start docker
sudo systemctl enable docker
# kubernetes安装
sudo curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add
(如果有问题,可以先浏览器下载完后传到该对应的机器上,执行:sudo apt-key add apt-key.gpg)
sudo echo "deb http://apt.kubernetes.io/ kubernetes-xenial main" > /etc/apt/sources.list.d/kubernetes.list
(可以自己编辑文件输入源)
增加源:
vim /etc/apt/sources.list
# 系统安装源
deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted
deb http://mirrors.aliyun.com/ubuntu/ xenial universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates universe
deb http://mirrors.aliyun.com/ubuntu/ xenial multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
# kubeadm及kubernetes组件安装源
deb https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial main
sudo apt-get update
sudo apt-get install -y kubelet kubeadm kubectl kubernetes-cni
备注:
如果上述源连不上,可以用ustc的:
vim /etc/apt/sources.list
deb http://mirrors.ustc.edu.cn/kubernetes/apt kubernetes-xenial main
4、配置Master机器的配置
在/etc/profile 下面增加如下环境变量
export KUBECONFIG=/etc/kubernetes/admin.conf
# 重起kubelet
systemctl daemon-reload
systemctl restart kubelet
在master节点上执行
kubeadm init --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=10.20.16.203 --kubernetes-version=v1.15.0 --ignore-preflight-errors=Swap
--pod-network-cidr是指配置节点中的pod的可用IP地址,此为内部IP
--apiserver-advertise-address 为master的IP地址
--kubernetes-version 通过kubectl version 可以查看到
不幸的是报错, k8s.gcr.io 被墙了,镜像下载失败
根据报错信息,在国内网站站上找到相关的镜像(docker需要配置阿里云的镜像仓库)
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.15.0
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.15.0
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.15.0
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.1
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.3.10
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.3.1
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.15.0
把这些images重新tag一下。
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.15.0 k8s.gcr.io/kube-controller-manager:v1.15.0
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.15.0 k8s.gcr.io/kube-scheduler:v1.15.0
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.15.0 k8s.gcr.io/kube-proxy:v1.15.0
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.1 k8s.gcr.io/pause:3.1
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.3.10 k8s.gcr.io/etcd:3.3.10
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.3.1 k8s.gcr.io/coredns:1.3.1
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.15.0 k8s.gcr.io/kube-apiserver:v1.15.0
重新执行
sudo kubeadm init --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=10.20.16.203 --kubernetes-version=v1.15.0 --ignore-preflight-errors=NumCPU --ignore-preflight-errors=Swap
安装成功,最后一行输出
kubeadm join 10.20.17.177:6443 --token l8iehg.p6yo7ktd0cfbb2d7 \
--discovery-token-ca-cert-hash sha256:bacd932a406e3ee48e024dae631726fb9ffe3cc07071e334be6f5650e0353331
在安装完Master节点后,查看节点信息( kubectl get nodes)会发现节点的状态为noready。查看noready的原因发现是由于cni插件没有配置。其实这是由于还没有配置网络。可以配置多种网络,这里作者选用最长远的fannel网络进行配置。
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
执行命令:
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
安装k8s网络配置(只在Master上执行)
sudo sysctl net.bridge.bridge-nf-call-iptables=1
下载kube-flannel.yml
sudo curl -O https://raw.githubusercontent.com/coreos/flannel/v0.10.0/Documentation/kube-flannel.yml
在-key上面增加一个
- key: node.kubernetes.io/not-ready
operator: Exists
effect: NoSchedule
启动
sudo kubectl apply -f kube-flannel.yml
查看结点运行是否正常:
sudo kubectl get node
sudo kubectl get po --all-namespaces
5、增加Node(只在node上执行)
sudo swapoff -a
执行上面的加入结点
kubeadm join 10.20.17.177:6443 --token l8iehg.p6yo7ktd0cfbb2d7 --discovery-token-ca-cert-hash sha256:bacd932a406e3ee48e024dae631726fb9ffe3cc07071e334be6f5650e0353331
sudo sysctl net.bridge.bridge-nf-call-iptables=1
检查所有结点状态
sudo kubectl get po --all-namespaces -o wide
查看pod错误信息
sudo kubectl describe po xxxx -n kube-system
查看到报了failed pulling image "k8s.gcr.io/pause:3.1的错误
也是上面的方法docker pull 然后打上tag
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.1
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.1 k8s.gcr.io/pause:3.1
过一会自己会刷新就可以了,如果不行就手动自己删除掉
删除命令:
sudo kubectl delete pod kube-flannel-ds-wg6wb -n kube-system
在node 执行,断开node命令:
在master上执行后可以重新init命令:
kubeadm reset
重新启动后,要执行如下命令
swapoff -a
systemctl daemon-reload
system restart kubelet
6、k8s基本使用命令
sudo kubectl get deployments --all-namespaces
sudo kubectl delete -f /root/kube.yaml
sudo kubectl apply -f /root/kube.yaml
sudo kubectl get services --all-namespaces
sudo kubectl get pod --all-namespaces -o wide
sudo kubectl describe pod xxxx -n kube-system
sudo kubectl delete pod xxxx -n kube-system
问题:
1、如果k8sMaster的IP换了怎么办?
把vim /etc/kubernetes/admin.conf 里的ip改成现在IP
然后执行
$ mkdir -p $HOME/.kube
$ sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
$ sudo chown $(id -u):$(id -g) $HOME/.kube/config
重启后需要关闭掉
swapoff -a
kubectl get nodes
sudo vi /etc/kubernetes/manifests/kube-apiserver.yaml 改成现在IP
sudo sysctl net.bridge.bridge-nf-call-iptables=1
systemctl disable firewald.service
网络提示:
The connection to the server localhost:8080 was refused - did you specify the right host or port?
网友评论