kubernetes - Ufw 防火墙阻止 kubernetes(使用 calico)

Question

我正在尝试在我的服务器(Debian 10)上安装一个 kubernetes 集群。在我的服务器上，我使用 ufw 作为防火墙。
在创建集群之前，我在 ufw 上允许这些端口:

179/tcp, 4789/udp, 5473/tcp, 443 /tcp, 6443/tcp, 2379/tcp, 4149/tcp, 10250/tcp, 10255/tcp, 10256/tcp, 9099/tcp, 6443/tcp

正如 calico doc 所建议的( https://docs.projectcalico.org/getting-started/kubernetes/requirements )和这个关于 kubernetes 安全性的 git repo( https://github.com/freach/kubernetes-security-best-practice )。

但是当我想创建集群时，由于 Felix 未上线，calico/node pod 无法启动(我在 ufw 上允许 9099/tcp):

Liveness probe failed: calico/node is not ready: Felix is not live: Get http://localhost:9099/liveness: dial tcp [::1]:9099: connect: connection refused

如果我禁用 ufw，则创建集群并且没有错误。

所以我想知道我应该如何配置 ufw 以便 kubernetes 工作。
如果有人可以帮助我，那就太好了，谢谢!

编辑:我的 ufw 状态

To                         Action      From
6443/tcp                   ALLOW       Anywhere
9099                       ALLOW       Anywhere
179/tcp                    ALLOW       Anywhere
4789/udp                   ALLOW       Anywhere
5473/tcp                   ALLOW       Anywhere
2379/tcp                   ALLOW       Anywhere
8181                       ALLOW       Anywhere
8080                       ALLOW       Anywhere
###### (v6)                LIMIT       Anywhere (v6)              # allow ssh connections in
Postfix (v6)               ALLOW       Anywhere (v6)
KUBE (v6)                  ALLOW       Anywhere (v6)
6443 (v6)                  ALLOW       Anywhere (v6)
6783/udp (v6)              ALLOW       Anywhere (v6)
6784/udp (v6)              ALLOW       Anywhere (v6)
6783/tcp (v6)              ALLOW       Anywhere (v6)
443/tcp (v6)               ALLOW       Anywhere (v6)
80/tcp (v6)                ALLOW       Anywhere (v6)
4149/tcp (v6)              ALLOW       Anywhere (v6)
10250/tcp (v6)             ALLOW       Anywhere (v6)
10255/tcp (v6)             ALLOW       Anywhere (v6)
10256/tcp (v6)             ALLOW       Anywhere (v6)
9099/tcp (v6)              ALLOW       Anywhere (v6)
6443/tcp (v6)              ALLOW       Anywhere (v6)
9099 (v6)                  ALLOW       Anywhere (v6)
179/tcp (v6)               ALLOW       Anywhere (v6)
4789/udp (v6)              ALLOW       Anywhere (v6)
5473/tcp (v6)              ALLOW       Anywhere (v6)
2379/tcp (v6)              ALLOW       Anywhere (v6)
8181 (v6)                  ALLOW       Anywhere (v6)
8080 (v6)                  ALLOW       Anywhere (v6)

53                         ALLOW OUT   Anywhere                   # allow DNS calls out
123                        ALLOW OUT   Anywhere                   # allow NTP out
80/tcp                     ALLOW OUT   Anywhere                   # allow HTTP traffic out
443/tcp                    ALLOW OUT   Anywhere                   # allow HTTPS traffic out
21/tcp                     ALLOW OUT   Anywhere                   # allow FTP traffic out
43/tcp                     ALLOW OUT   Anywhere                   # allow whois
SMTPTLS                    ALLOW OUT   Anywhere                   # open TLS port 465 for use with SMPT to send e-mails
10.32.0.0/12               ALLOW OUT   Anywhere on weave
53 (v6)                    ALLOW OUT   Anywhere (v6)              # allow DNS calls out
123 (v6)                   ALLOW OUT   Anywhere (v6)              # allow NTP out
80/tcp (v6)                ALLOW OUT   Anywhere (v6)              # allow HTTP traffic out
443/tcp (v6)               ALLOW OUT   Anywhere (v6)              # allow HTTPS traffic out
21/tcp (v6)                ALLOW OUT   Anywhere (v6)              # allow FTP traffic out
43/tcp (v6)                ALLOW OUT   Anywhere (v6)              # allow whois
SMTPTLS (v6)               ALLOW OUT   Anywhere (v6)              # open TLS port 465 for use with SMPT to send e-mails

抱歉，我的 ufw 规则有点乱，我尝试了太多方法来让 kubernetes 正常工作。

Answer 1

I'm trying to install a kubernetes cluster on my server (Debian 10). On my server I used ufw as firewall. Before creating the cluster I allowed these ports on ufw: 179/tcp, 4789/udp, 5473/tcp, 443 /tcp, 6443/tcp, 2379/tcp, 4149/tcp, 10250/tcp, 10255/tcp, 10256/tcp, 9099/tcp, 6443/tcp

注意:所有可执行命令都以 $ 开头

按照此初始说明，我在 Debian 10 上安装了 ufw 并启用了您提到的相同端口:

$ sudo apt update && sudo apt-upgrade -y
$ sudo apt install ufw -y
$ sudo ufw allow ssh
Rule added
Rule added (v6)

$ sudo ufw enable
Command may disrupt existing ssh connections. Proceed with operation (y|n)? y
Firewall is active and enabled on system startup

$ sudo ufw allow 179/tcp
$ sudo ufw allow 4789/tcp
$ sudo ufw allow 5473/tcp
$ sudo ufw allow 443/tcp
$ sudo ufw allow 6443/tcp
$ sudo ufw allow 2379/tcp
$ sudo ufw allow 4149/tcp
$ sudo ufw allow 10250/tcp
$ sudo ufw allow 10255/tcp
$ sudo ufw allow 10256/tcp
$ sudo ufw allow 9099/tcp

$ sudo ufw status
Status: active
To                         Action      From
--                         ------      ----
22/tcp                     ALLOW       Anywhere                  
179/tcp                    ALLOW       Anywhere                  
4789/tcp                   ALLOW       Anywhere                  
5473/tcp                   ALLOW       Anywhere                  
443/tcp                    ALLOW       Anywhere                  
6443/tcp                   ALLOW       Anywhere                  
2379/tcp                   ALLOW       Anywhere                  
4149/tcp                   ALLOW       Anywhere                  
10250/tcp                  ALLOW       Anywhere                  
10255/tcp                  ALLOW       Anywhere                  
10256/tcp                  ALLOW       Anywhere                  
22/tcp (v6)                ALLOW       Anywhere (v6)             
179/tcp (v6)               ALLOW       Anywhere (v6)             
4789/tcp (v6)              ALLOW       Anywhere (v6)             
5473/tcp (v6)              ALLOW       Anywhere (v6)             
443/tcp (v6)               ALLOW       Anywhere (v6)             
6443/tcp (v6)              ALLOW       Anywhere (v6)             
2379/tcp (v6)              ALLOW       Anywhere (v6)             
4149/tcp (v6)              ALLOW       Anywhere (v6)             
10250/tcp (v6)             ALLOW       Anywhere (v6)             
10255/tcp (v6)             ALLOW       Anywhere (v6)             
10256/tcp (v6)             ALLOW       Anywhere (v6)       

现在我要安装 Docker :

$ sudo apt-get update
$ sudo apt-get install -y apt-transport-https ca-certificates curl gnupg2 software-properties-common=

添加 Docker 存储库:

$ curl -fsSL https://download.docker.com/linux/debian/gpg | sudo apt-key add -
$ sudo apt-key fingerprint 0EBFCD88
$ sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/debian buster stable"

更新源列表并安装 Docker-ce:

$ sudo apt-get update
$ sudo apt-get -y install docker-ce

注意:在生产系统上建议安装一个固定版本的 docker:

$ apt-cache madison docker-ce
$ sudo apt-get install docker-ce=<VERSION>

安装 Kube Tools - kubeadm、kubectl、kubelet:

$ curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -

配置 Kubernetes 存储库(复制 3 行并一次粘贴):

$ cat <<EOF | sudo tee /etc/apt/sources.list.d/kubernetes.list
deb https://apt.kubernetes.io/ kubernetes-xenial main
EOF

安装包:

$ sudo apt-get update
$ sudo apt-get install -y kubelet kubeadm kubectl

安装后标记这些包不自动更新:

$ sudo apt-mark hold kubelet kubeadm kubectl

Initialize the Cluster :

$ sudo kubeadm init --pod-network-cidr=192.168.0.0/16

为非 root 用户启用 kubectl:

$ mkdir -p $HOME/.kube
$ sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
$ sudo chown $(id -u):$(id -g) $HOME/.kube/config

Installing Calico :

$ kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml
configmap/calico-config created
customresourcedefinition.apiextensions.k8s.io/bgpconfigurations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/bgppeers.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/blockaffinities.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/clusterinformations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/felixconfigurations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/globalnetworkpolicies.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/globalnetworksets.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/hostendpoints.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipamblocks.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipamconfigs.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipamhandles.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ippools.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/networkpolicies.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/networksets.crd.projectcalico.org created
clusterrole.rbac.authorization.k8s.io/calico-kube-controllers created
clusterrolebinding.rbac.authorization.k8s.io/calico-kube-controllers created
clusterrole.rbac.authorization.k8s.io/calico-node created
clusterrolebinding.rbac.authorization.k8s.io/calico-node created
daemonset.apps/calico-node created
serviceaccount/calico-node created
deployment.apps/calico-kube-controllers created
serviceaccount/calico-kube-controllers created

查看状态:

$ kubectl get pods -n kube-system
NAME                                           READY   STATUS    RESTARTS   AGE
calico-kube-controllers-555fc8cc5c-wnnvq       1/1     Running   0          26m
calico-node-sngt8                              1/1     Running   0          26m
coredns-66bff467f8-2qqlv                       1/1     Running   0          55m
coredns-66bff467f8-vptpr                       1/1     Running   0          55m
etcd-kubeadm-ufw-debian10                      1/1     Running   0          55m
kube-apiserver-kubeadm-ufw-debian10            1/1     Running   0          55m
kube-controller-manager-kubeadm-ufw-debian10   1/1     Running   0          55m
kube-proxy-nx8cz                               1/1     Running   0          55m
kube-scheduler-kubeadm-ufw-debian10            1/1     Running   0          55m

注意事项:

Sorry my ufw rules are a bit messy, I tried too many things to get kubernetes working.

尝试很多事情来使某些事情奏效是很正常的，但有时最终会成为问题本身。

我正在向您发布我在与您相同的环境中部署它的步骤，以便您可以再次遵循它以实现相同的结果。

我的 felix 探针没有出现任何错误，只有当我尝试(故意)部署 kubernetes 而不在 ufw 上创建规则时才出现错误。

如果没有解决，下一步:

现在，如果在遵循本教程后仍然遇到类似问题，请使用以下信息更新问题:

kubectl describe <pod_name> -n kube-system

kubectl get pod <pod_name> -n kube-system

kubectl logs <pod_name> -n kube-system

始终建议从全新安装 Linux 开始，如果您正在运行 VM，请删除该 VM 并创建一个新的 VM。

如果您在裸机上运行，​​请考虑服务器上运行的其他内容，也许还有其他软件干扰了网络通信。

如果您按照这些故障排除步骤发现任何问题，请在评论中告诉我。