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增加替换集群网络插件的脚本和文档
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# 替换k8s集群的网络插件
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有时候我们在测试环境的k8s集群中希望试用多种网络插件(calico/flannel/kube-router),又不希望每测试一次就全部清除集群然后重建,那么你就需要这个文档。
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- WARNNING:重新安装k8s网络插件会短暂中断已有运行在k8s上的服务
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- 请在熟悉kubeasz的安装流程和k8s网络插件安装流程的基础上谨慎操作
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- 如果k8s集群已经运行庞大业务pod,重装网络插件时会引起所有pod的删除、重建,短时间内将给apiserver带来压力,可能引起master节点夯住
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## 替换流程
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kubeasz使用标准cni方式安装k8s集群的网络插件;cni负载创建容器网卡和IP分配(IPAM),不同的网络插件(calico,flannel等)创建容器网卡和IP分配方式不一样,所以在替换网络插件时候需要现有pod全部删除,然后自动按照新网络插件的方式重建pod网络;请参考[k8s网络插件章节](../06-安装网络组件.md)。
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- 1.清除现有集群网络插件
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``` bash
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ansible-playbook /etc/ansible/tools/clean_k8s_network.yml
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```
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对照脚本`clean_k8s_network.yml` 大致流程为:
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- 根据实际运行情况,删除现有网络组件的daemonset pod
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- 如果现有组件是kube-router 需要进行一些额外清理和可能需要恢复默认kube-proxy服务
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- 清理cni网络配置和具体插件的运行、配置文件
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- 清理生成的容器网络组件(bridge,tunl等)
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- 如果现有组件是calico 需要额外清理bgp路由
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- 最后删除所有k8s上已运行的pod(会由controller负责重建)
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- 2.修改ansible hosts文件指定新网络插件后,然后重新执行安装
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``` bash
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ansible-playbook /etc/ansible/06.network.yml
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```
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## 验证新网络插件
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参照[calico](../06.calico.md) [flannel](../06.flannel.md) [kube-router](../06.kube-router.md)
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## 已知BUG
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如果现有网络是kube-router, 按上述步骤完成替换成其他网络时,需要额外执行一次pod重建:
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``` bash
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ansible-playbook /etc/ansible/tools/clean_k8s_network.yml -t reload_pods
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```
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@ -6,3 +6,4 @@
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- [修改多主集群VIP地址](ChangeVIP.md)
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- [修改AIO部署的系统IP](change_ip_allinone.md)
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- [集群删除单个节点](del_one_node.md)
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- [替换集群使用的网络插件](clean_k8s_network.md)
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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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tasks:
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- name: 获取所有已经创建的POD信息
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command: "{{ bin_dir }}/kubectl get daemonset -n kube-system"
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register: pod_info
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run_once: true
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- name: 删除原network插件calico部署
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shell: "{{ bin_dir }}/kubectl delete -f /opt/kube/kube-system/calico/ || \
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{{ bin_dir }}/kubectl delete -f /root/local/kube-system/calico/"
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ignore_errors: true
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run_once: true
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when: '"calico" in pod_info.stdout'
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- name: 删除原network插件flannel部署
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shell: "{{ bin_dir }}/kubectl delete -f /opt/kube/kube-system/flannel/ || \
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{{ bin_dir }}/kubectl delete -f /root/local/kube-system/flannel/"
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ignore_errors: true
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run_once: true
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when: '"flannel" in pod_info.stdout'
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- name: 删除原network插件kube-router部署
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shell: "{{ bin_dir }}/kubectl delete -f /opt/kube/kube-system/kube-router/ || \
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{{ bin_dir }}/kubectl delete -f /root/local/kube-system/kube-router/"
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ignore_errors: true
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run_once: true
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when: '"kube-router" in pod_info.stdout'
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- name: 清理kube-router相关
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shell: "{{ bin_dir }}/docker run --privileged --net=host cloudnativelabs/kube-router --cleanup-config"
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ignore_errors: true
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when: '"kube-router" in pod_info.stdout'
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# 如果使用了kube-router的service-proxy,删除kube-router后还需开启kube-proxy
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- name: 恢复默认的kube-proxy服务
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shell: "systemctl start kube-proxy.service; systemctl enable kube-proxy.service"
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ignore_errors: true
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when: "'kube-router' in pod_info.stdout and SERVICE_PROXY == 'IPVS'"
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- name: 清理目录和文件
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file: name={{ item }} state=absent
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with_items:
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- "/etc/cni/"
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- "/run/flannel/"
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- "/etc/calico/"
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- "/var/run/calico/"
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- "/var/log/calico/"
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- "/var/lib/cni/"
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- "/var/lib/kube-router/"
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- "/opt/kube/kube-system/"
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- name: 清理网络
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shell: "ip link del tunl0; \
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ip link del flannel.1; \
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ip link del cni0; \
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ip link del mynet0; \
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ip link del kube-bridge; \
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ip link del dummy0; \
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systemctl restart networking; \
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systemctl restart network"
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ignore_errors: true
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- name: 清理calico残留路由
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shell: "for rt in `ip route|grep bird|sed 's/blackhole//'|awk '{print $1}'`;do ip route del $rt;done;"
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when: '"calico" in pod_info.stdout'
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ignore_errors: true
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# 删除所有运行pod,由controller自动重建
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- name: 重启所有pod
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shell: "for NS in $({{ bin_dir }}/kubectl get ns|awk 'NR>1{print $1}'); \
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do {{ bin_dir }}/kubectl delete pod --all -n $NS; done;"
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ignore_errors: true
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run_once: true
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tags: reload_pods
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