mirror of https://github.com/easzlab/kubeasz.git
167 lines
7.2 KiB
Markdown
167 lines
7.2 KiB
Markdown
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## 06-安装calico网络组件.md
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推荐阅读[calico kubernetes guide](https://docs.projectcalico.org/v3.0/getting-started/kubernetes/)
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本项目提供多种网络插件可选，如果需要安装calico，请在/etc/ansible/hosts文件中设置变量 `CLUSTER_NETWORK="calico"`，更多的calico设置在`roles/calico/defaults/main.yml`文件定义。
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- calico-node需要在所有master节点和node节点安装
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``` bash
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roles/calico/
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├── tasks
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│ └── main.yml
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└── templates
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├── calico-csr.json.j2
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├── calicoctl.cfg.j2
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├── calico-rbac.yaml.j2
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└── calico.yaml.j2
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```
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请在另外窗口打开[roles/calico/tasks/main.yml](../roles/calico/tasks/main.yml) 文件，对照看以下讲解内容。
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### 创建calico 证书申请
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``` bash
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{
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"CN": "calico",
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"hosts": [],
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"key": {
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"algo": "rsa",
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"size": 2048
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},
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"names": [
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{
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"C": "CN",
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"ST": "HangZhou",
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"L": "XS",
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"O": "k8s",
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"OU": "System"
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}
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]
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}
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```
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- calico 使用客户端证书，所以hosts字段可以为空；后续可以看到calico证书用在四个地方：
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- calico/node 这个docker 容器运行时访问 etcd 使用证书
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- cni 配置文件中，cni 插件需要访问 etcd 使用证书
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- calicoctl 操作集群网络时访问 etcd 使用证书
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- calico/kube-controllers 同步集群网络策略时访问 etcd 使用证书
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### 创建 calico DaemonSet yaml文件和rbac 文件
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请对照 roles/calico/templates/calico.yaml.j2文件注释和以下注意内容
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+ 详细配置参数请参考[calico官方文档](https://docs.projectcalico.org/v2.6/reference/node/configuration)
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+ calico-node是以docker容器运行在host上的，因此需要把之前的证书目录 /etc/calico/ssl挂载到容器中
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+ 配置ETCD_ENDPOINTS 、CA、证书等，所有{{ }}变量与ansible hosts文件中设置对应
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+ 配置集群POD网络 CALICO_IPV4POOL_CIDR={{ CLUSTER_CIDR }}
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+ **重要**本K8S集群运行在同网段kvm虚机上，虚机间没有网络ACL限制，因此可以设置`CALICO_IPV4POOL_IPIP=off`，如果你的主机位于不同网段，或者运行在公有云上需要打开这个选项 `CALICO_IPV4POOL_IPIP=always`
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+ 配置FELIX_DEFAULTENDPOINTTOHOSTACTION=ACCEPT 默认允许Pod到Node的网络流量，更多[felix配置选项](https://docs.projectcalico.org/v2.6/reference/felix/configuration)
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+ 多网卡服务器运行kube-controller可能会出现问题，本项目已通过增加设置环境变量`KUBERNETES_SERVICE_HOST`和`KUBERNETES_SERVICE_PORT`解决
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### 安装calico 网络
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+ 安装前检查主机名不能有大写字母，只能由`小写字母` `-` `.` 组成 (name must consist of lower case alphanumeric characters, '-' or '.' (regex: [a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*))(calico-node v3.0.6以上已经解决主机大写字母问题)
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+ **安装前必须确保各节点主机名不重复** ，calico node name 由节点主机名决定，如果重复，那么重复节点在etcd中只存储一份配置，BGP 邻居也不会建立。
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+ 安装之前必须确保`kube-master`和`kube-node`节点已经成功部署
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+ 只需要在任意装有kubectl客户端的节点运行 `kubectl create `安装即可
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+ 等待15s后(视网络拉取calico相关镜像速度)，calico 网络插件安装完成，删除之前kube-node安装时默认cni网络配置
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### [可选]配置calicoctl工具 [calicoctl.cfg.j2](roles/calico/templates/calicoctl.cfg.j2)
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``` bash
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apiVersion: v1
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kind: calicoApiConfig
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metadata:
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spec:
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datastoreType: "etcdv2"
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etcdEndpoints: {{ ETCD_ENDPOINTS }}
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etcdKeyFile: /etc/calico/ssl/calico-key.pem
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etcdCertFile: /etc/calico/ssl/calico.pem
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etcdCACertFile: /etc/calico/ssl/ca.pem
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```
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### 验证calico网络
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执行calico安装成功后可以验证如下：(需要等待镜像下载完成，有时候即便上一步已经配置了docker国内加速，还是可能比较慢，请确认以下容器运行起来以后，再执行后续验证步骤)
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``` bash
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kubectl get pod --all-namespaces
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NAMESPACE NAME READY STATUS RESTARTS AGE
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kube-system calico-kube-controllers-5c6b98d9df-xj2n4 1/1 Running 0 1m
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kube-system calico-node-4hr52 2/2 Running 0 1m
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kube-system calico-node-8ctc2 2/2 Running 0 1m
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kube-system calico-node-9t8md 2/2 Running 0 1m
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```
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**查看网卡和路由信息**
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先在集群创建几个测试pod: `kubectl run test --image=busybox --replicas=3 sleep 30000`
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``` bash
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# 查看网卡信息
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ip a
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```
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+ 可以看到包含类似cali1cxxx的网卡，是calico为测试pod生成的
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+ tunl0网卡现在不用管，是默认生成的，当开启IPIP 特性时使用的隧道
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``` bash
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# 查看路由
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route -n
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Kernel IP routing table
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Destination Gateway Genmask Flags Metric Ref Use Iface
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0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 ens3
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192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 ens3
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172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 docker0
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172.20.3.64 192.168.1.34 255.255.255.192 UG 0 0 0 ens3
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172.20.33.128 0.0.0.0 255.255.255.192 U 0 0 0 *
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172.20.33.129 0.0.0.0 255.255.255.255 UH 0 0 0 caliccc295a6d4f
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172.20.104.0 192.168.1.35 255.255.255.192 UG 0 0 0 ens3
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172.20.166.128 192.168.1.63 255.255.255.192 UG 0 0 0 ens3
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```
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**查看所有calico节点状态**
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``` bash
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calicoctl node status
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Calico process is running.
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IPv4 BGP status
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+--------------+-------------------+-------+----------+-------------+
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| PEER ADDRESS | PEER TYPE | STATE | SINCE | INFO |
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+--------------+-------------------+-------+----------+-------------+
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| 192.168.1.34 | node-to-node mesh | up | 12:34:00 | Established |
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| 192.168.1.35 | node-to-node mesh | up | 12:34:00 | Established |
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| 192.168.1.63 | node-to-node mesh | up | 12:34:01 | Established |
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+--------------+-------------------+-------+----------+-------------+
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```
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**BGP 协议是通过TCP 连接来建立邻居的，因此可以用netstat 命令验证 BGP Peer**
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``` bash
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netstat -antlp|grep ESTABLISHED|grep 179
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tcp 0 0 192.168.1.66:179 192.168.1.35:41316 ESTABLISHED 28479/bird
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tcp 0 0 192.168.1.66:179 192.168.1.34:40243 ESTABLISHED 28479/bird
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tcp 0 0 192.168.1.66:179 192.168.1.63:48979 ESTABLISHED 28479/bird
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```
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**查看etcd中calico相关信息**
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因为这里calico网络使用etcd存储数据，所以可以在etcd集群中查看数据
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+ calico 3.x 版本默认使用 etcd v3存储，**登陆集群的一个etcd 节点**，查看命令：
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``` bash
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# 查看所有calico相关数据
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ETCDCTL_API=3 etcdctl --endpoints="http://127.0.0.1:2379" get --prefix /calico
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# 查看 calico网络为各节点分配的网段
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ETCDCTL_API=3 etcdctl --endpoints="http://127.0.0.1:2379" get --prefix /calico/ipam/v2/host
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```
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+ calico 2.x 版本默认使用 etcd v2存储，**登陆集群的一个etcd 节点**，查看命令：
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``` bash
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# 查看所有calico相关数据
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etcdctl --endpoints=http://127.0.0.1:2379 --ca-file=/etc/kubernetes/ssl/ca.pem ls /calico
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```
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