mirror of https://github.com/easzlab/kubeasz.git
更新升级集群相关脚本和文档
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# to install docker service
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- hosts:
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- kube-master
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- new-master
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- kube-node
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- new-node
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roles:
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- docker
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# Read the guide: 'op/upgrade.md' .
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# update kubectl binary
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- hosts:
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- kube-master
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- kube-node
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- deploy
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roles:
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- prepare
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# update etcd
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- hosts: etcd
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roles:
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- etcd
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# update docker binary
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- hosts:
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- kube-master
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- new-master
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- kube-node
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- new-node
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- deploy
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roles:
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- docker
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- prepare
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# update masters
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- hosts:
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@ -1,13 +1,13 @@
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## 升级注意事项
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## k8s 集群升级
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集群更新存在一定风险,请谨慎操作。
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集群升级存在一定风险,请谨慎操作。
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- 项目分支`master`安装的集群可以在k8s 1.8/1.9/1.10/1.11/1.12 任意小版本、大版本间升级(特别注意如果跨大版本升级需要修改/etc/ansible/hosts文件中的参数K8S_VER)
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- 项目分支`closed`(已停止更新)安装的集群目前只能进行小版本1.8.x的升级
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### 备份etcd数据
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- 升级前手动对 etcd数据做镜像备份,在任意 etcd节点上执行:
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- 升级前对 etcd数据做备份,在任意 etcd节点上执行:
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``` bash
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# snapshot备份
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@ -17,18 +17,31 @@ $ ETCDCTL_API=3 etcdctl --write-out=table snapshot status backup.db
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```
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- `kubeasz`项目也可以方便执行 `ansible-playbook /etc/ansible/23.backup.yml`,详情阅读文档[备份恢复](cluster_restore.md)
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### 升级步骤
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### 快速k8s版本升级
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- 1.下载新的二进制解压并替换 `/etc/ansible/bin/` 目录下文件
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快速升级是指只升级`k8s`版本,比较常见如`Bug修复` `重要特性发布`时使用。
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- 2a.如果不需要升级 docker版本:执行 `ansible-playbook -t upgrade_k8s 22.upgrade.yml` 即可完成k8s 升级,不会中断业务应用
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- 注:建议使用稳定版本 docker
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- 首先去官网release下载待升级的k8s版本,例如`https://dl.k8s.io/v1.11.5/kubernetes-server-linux-amd64.tar.gz`
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- 解压下载的tar.gz文件,找到如下`kube*`开头的二进制,复制替换deploy节点目录`/etc/ansible/bin`对应文件
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- kube-apiserver
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- kube-controller-manager
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- kubectl
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- kubelet
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- kube-proxy
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- kube-scheduler
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- 在deploy节点执行`ansible-playbook -t upgrade_k8s 22.upgrade.yml`即可完成k8s 升级,不会中断业务应用
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- 2b.如果可以接受短暂业务中断,执行 `ansible-playbook -t upgrade_k8s,upgrade_docker 22.upgrade.yml` 即可升级 k8s和 docker(如果有新的docker二进制)
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### 其他升级说明
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- 2c.如果要求零中断升级 k8s和 docker
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- i 执行 `ansible-playbook -t upgrade_k8s,download_docker 22.upgrade.yml` (该步骤不会影响k8s上的业务应用)
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- ii 逐个升级重启每个node节点的dockerd服务
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- 待重启节点,先应用`kubectl cordon`和`kubectl drain`命令迁移业务pod
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- 待重启节点执行 `systemctl restart docker`
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其他升级是指升级k8s组件包括:`etcd版本` `docker版本`,一般不需要用到,以下仅作说明。
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- 1.下载所有组件相关新的二进制解压并替换 `/etc/ansible/bin/` 目录下文件
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- 2.升级 etcd: `ansible-playbook -t upgrade_etcd 02.etcd.yml`
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- 3.升级 docker (建议使用k8s官方支持的docker稳定版本)
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- 如果可以接受短暂业务中断,执行 `ansible-playbook -t upgrade_docker 03.docker.yml`
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- 如果要求零中断升级,执行 `ansible-playbook -t download_docker 03.docker.yml`,然后手动执行如下
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- 待升级节点,先应用`kubectl cordon`和`kubectl drain`命令迁移业务pod
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- 待升级节点执行 `systemctl restart docker`
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- 恢复节点可调度 `kubectl uncordon`
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@ -3,7 +3,7 @@
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with_items:
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- etcd
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- etcdctl
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tags: upgrade_k8s
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tags: upgrade_etcd
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- name: 创建etcd证书目录
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file: name=/etc/etcd/ssl state=directory
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- name: 创建etcd的systemd unit文件
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template: src=etcd.service.j2 dest=/etc/systemd/system/etcd.service
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tags: upgrade_etcd
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- name: 开机启用etcd服务
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shell: systemctl enable etcd
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- name: 开启etcd服务
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shell: systemctl daemon-reload && systemctl restart etcd
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tags: upgrade_k8s
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tags: upgrade_etcd
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- "{{ ca_dir }}"
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- /root/.kube
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- name: 下载证书工具 CFSSL和 kubectl
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- name: 分发证书工具 CFSSL
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copy: src={{ base_dir }}/bin/{{ item }} dest={{ bin_dir }}/{{ item }} mode=0755
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with_items:
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- cfssl
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- cfssl-certinfo
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- cfssljson
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- kubectl
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- name: 分发 kubectl
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copy: src={{ base_dir }}/bin/kubectl dest={{ bin_dir }}/kubectl mode=0755
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tags: upgrade_k8s
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- name: 分发 kubeconfig配置文件
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