Linux - K8S - Calico
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 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528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 | # 网络calico## BGP进阶```shcd /usr/local/bin/curl -o calicoctl -O -L https://github.com/projectcalico/calicoctl/releases/download/v3.20.2/calicoctl[00:41:57 root@master1 bin]#chmod +x calicoctl [22:39:36 root@master1 calico]#cat /etc/calico/calicoctl.cfg apiVersion: projectcalico.org/v3kind: CalicoAPIConfigmetadata:spec: datastoreType: "kubernetes" kubeconfig: "/etc/kubernetes/admin.conf"# 测试[22:40:04 root@master1 calico]#calicoctl get nodesNAME master1 master2.noisedu.cn master3.noisedu.cn node1.noisedu.cn node2.noisedu.cn# 关联kubectl[22:42:05 root@master1 calico]#cd /usr/local/bin/[22:42:25 root@master1 bin]#cp -p calicoctl kubectl-calico[00:43:00 root@master1 bin]#kubectl calico node statusCalico process is running.IPv4 BGP status+--------------+-------------------+-------+----------+-------------+| PEER ADDRESS | PEER TYPE | STATE | SINCE | INFO |+--------------+-------------------+-------+----------+-------------+| 10.0.0.51 | node-to-node mesh | up | 16:41:21 | Established || 10.0.0.52 | node-to-node mesh | up | 16:41:20 | Established || 10.0.0.53 | node-to-node mesh | up | 16:41:20 | Established || 10.0.0.54 | node-to-node mesh | up | 16:41:20 | Established |+--------------+-------------------+-------+----------+-------------+IPv6 BGP statusNo IPv6 peers found.```## 更改ipip model从always到CrossSubnet。```sh# 当前通信我们是双层嵌套IP，即ipip模式，会自动生成一个tune0网卡，所有的流量都从这个网卡通信[22:48:57 root@master1 cmd]#ifconfigtunl0: flags=193<UP,RUNNING,NOARP> mtu 1480 inet 10.244.0.1 netmask 255.255.255.255 tunnel txqueuelen 1000 (IPIP Tunnel) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0[22:54:58 root@master1 cmd]#ip route listdefault via 10.0.0.2 dev eth0 proto static 10.0.0.0/24 dev eth0 proto kernel scope link src 10.0.0.50 blackhole 10.244.0.0/24 proto bird 10.244.0.5 dev calif478a5ea502 scope link 10.244.0.6 dev cali260b8463b8f scope link 10.244.0.7 dev cali21f5341d0ac scope link 10.244.3.0/24 via 10.0.0.53 dev tunl0 proto bird onlink 10.244.4.0/24 via 10.0.0.54 dev tunl0 proto bird onlink 172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown [22:45:00 root@master1 cmd]#kubectl calico get ipPools default-ipv4-ippool -o yamlapiVersion: projectcalico.org/v3kind: IPPoolmetadata: creationTimestamp: "2021-12-11T15:49:12Z" name: default-ipv4-ippool resourceVersion: "2012" uid: 894ee240-f66d-47a0-96ca-b634d20f2803spec: blockSize: 24 cidr: 10.244.0.0/16 ipipMode: Always natOutgoing: true nodeSelector: all() vxlanMode: Never # 更改网卡模式到CrossSubnet，即通过实际的物理网卡eth0通信[22:51:05 root@master1 cmd]#cat default-ipv4-ippool.yaml apiVersion: projectcalico.org/v3kind: IPPoolmetadata: name: default-ipv4-ippoolspec: blockSize: 24 cidr: 10.244.0.0/16 ipipMode: CrossSubnet natOutgoing: true nodeSelector: all() vxlanMode: Never[22:55:39 root@master1 cmd]#kubectl calico apply -f default-ipv4-ippool.yaml Successfully applied 1 'IPPool' resource(s)[22:55:41 root@master1 cmd]#ip route listdefault via 10.0.0.2 dev eth0 proto static 10.0.0.0/24 dev eth0 proto kernel scope link src 10.0.0.50 blackhole 10.244.0.0/24 proto bird 10.244.0.5 dev calif478a5ea502 scope link 10.244.0.6 dev cali260b8463b8f scope link 10.244.0.7 dev cali21f5341d0ac scope link 10.244.3.0/24 via 10.0.0.53 dev eth0 proto bird 10.244.4.0/24 via 10.0.0.54 dev eth0 proto bird 172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown ```## 反射器角色 - 从BGP peer到BGP reflecter### 0 查看现在的node网络状态，是点对点模式```sh[00:44:06 root@master1 cmd]#kubectl calico node statusCalico process is running.IPv4 BGP status+--------------+-------------------+-------+----------+-------------+| PEER ADDRESS | PEER TYPE | STATE | SINCE | INFO |+--------------+-------------------+-------+----------+-------------+| 10.0.0.51 | node-to-node mesh | up | 16:41:21 | Established || 10.0.0.52 | node-to-node mesh | up | 16:41:20 | Established || 10.0.0.53 | node-to-node mesh | up | 16:41:20 | Established || 10.0.0.54 | node-to-node mesh | up | 16:41:20 | Established |+--------------+-------------------+-------+----------+-------------+IPv6 BGP statusNo IPv6 peers found.```### 1 定义反射器角色```sh[23:10:14 root@master1 calico]#cat 01-calico-reflector-master.yaml apiVersion: projectcalico.org/v3kind: Nodemetadata: labels: route-reflector: true name: master1spec: bgp: ipv4Address: 10.0.0.50/16 ipv4IPIPTunnelAddr: 10.244.0.1 routeReflectorClusterID: 1.1.1.1[23:10:55 root@master1 calico]#kubectl calico apply -f 01-calico-reflector-master.yaml Successfully applied 1 'Node' resource(s)```### 2 后端节点使用反射器```sh# 更改到BGP reflecter网络模型[23:11:04 root@master1 calico]#cat 02-calico-reflector-bgppeer.yaml kind: BGPPeerapiVersion: projectcalico.org/v3metadata: name: bgppeer-demospec: nodeSelector: all() peerSelector: route-reflector=="true"[23:12:09 root@master1 calico]#kubectl calico apply -f 02-calico-reflector-bgppeer.yaml Successfully applied 1 'BGPPeer' resource(s)# 查看node状态，同时存在点对点和反射网络模型[00:44:58 root@master1 calico]#kubectl calico node statusCalico process is running.IPv4 BGP status+--------------+-------------------+-------+----------+-------------+| PEER ADDRESS | PEER TYPE | STATE | SINCE | INFO |+--------------+-------------------+-------+----------+-------------+| 10.0.0.51 | node-to-node mesh | up | 16:41:22 | Established || 10.0.0.52 | node-to-node mesh | up | 16:41:21 | Established || 10.0.0.53 | node-to-node mesh | up | 16:41:21 | Established || 10.0.0.54 | node-to-node mesh | up | 16:41:21 | Established || 10.0.0.51 | node specific | start | 16:44:58 | Idle || 10.0.0.52 | node specific | start | 16:44:58 | Idle || 10.0.0.53 | node specific | start | 16:44:58 | Idle || 10.0.0.54 | node specific | start | 16:44:58 | Idle |+--------------+-------------------+-------+----------+-------------+IPv6 BGP statusNo IPv6 peers found.```### 3 关闭默认的网格效果```sh[23:13:19 root@master1 calico]#cat 03-calico-reflector-defaultconfig.yaml apiVersion: projectcalico.org/v3kind: BGPConfigurationmetadata: name: defaultspec: logSeverityScreen: Info nodeToNodeMeshEnabled: false asNumber: 63400[23:13:50 root@master1 calico]#kubectl calico apply -f 03-calico-reflector-defaultconfig.yaml Successfully applied 1 'BGPConfiguration' resource(s)# 查看node状态，检查是否删除了点对点网络[00:45:25 root@master1 calico]#kubectl calico node statusCalico process is running.IPv4 BGP status+--------------+---------------+-------+----------+-------------+| PEER ADDRESS | PEER TYPE | STATE | SINCE | INFO |+--------------+---------------+-------+----------+-------------+| 10.0.0.51 | node specific | up | 16:45:26 | Established || 10.0.0.52 | node specific | up | 16:45:25 | Established || 10.0.0.53 | node specific | up | 16:45:26 | Established || 10.0.0.54 | node specific | up | 16:45:26 | Established |+--------------+---------------+-------+----------+-------------+IPv6 BGP statusNo IPv6 peers found.```## 网络策略### 准备环境```sh[22:06:09 root@master1 calico]#cat 04-calico-deployment-test.yaml apiVersion: v1kind: Namespacemetadata: name: develop labels: kubernetes.io/metadata.name: develop---apiVersion: apps/v1kind: Deploymentmetadata: labels: app: pod-deployment1 name: pod-deployment1 namespace: developspec: replicas: 3 selector: matchLabels: app: pod-deployment1 template: metadata: labels: app: pod-deployment1 spec: containers: - image: 10.0.0.55:80/mykubernetes/pod_test:v0.1 name: pod-test---apiVersion: v1kind: Servicemetadata: labels: app: pod-deployment1 name: pod-deployment1 namespace: developspec: ports: - port: 80 protocol: TCP targetPort: 80 selector: app: pod-deployment1 type: ClusterIP[22:12:35 root@master1 calico]#kubectl get pods -n develop -o wideNAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATESpod-deployment1-85bd7684f6-grsw9 1/1 Running 0 32s 10.244.3.4 node1.noisedu.cn <none> <none>pod-deployment1-85bd7684f6-njn6x 1/1 Running 0 32s 10.244.3.5 node1.noisedu.cn <none> <none>pod-deployment1-85bd7684f6-p9plh 1/1 Running 0 32s 10.244.4.5 node2.noisedu.cn <none> <none># 皆能正常访问[22:12:47 root@master1 calico]#curl 10.244.3.4kubernetes pod-test v0.1!! ClientIP: 10.0.0.50, ServerName: pod-deployment1-85bd7684f6-grsw9, ServerIP: 10.244.3.4![22:13:01 root@master1 calico]#curl 10.244.3.5kubernetes pod-test v0.1!! ClientIP: 10.0.0.50, ServerName: pod-deployment1-85bd7684f6-njn6x, ServerIP: 10.244.3.5![22:13:09 root@master1 calico]#curl 10.244.4.5kubernetes pod-test v0.1!! ClientIP: 10.0.0.50, ServerName: pod-deployment1-85bd7684f6-p9plh, ServerIP: 10.244.4.5!```### 默认策略```sh# 采用默认规则，虽然policy type定义了ingress和egress，但是未定义任何的ingress字段[22:13:12 root@master1 calico]#cat 05-calico-networkpolicy-denyall.yaml apiVersion: networking.k8s.io/v1kind: NetworkPolicymetadata: name: deny-all-ingress namespace: developspec: podSelector: {} policyTypes: ["Ingress", "Egress"][22:20:08 root@master1 calico]#kubectl apply -f 05-calico-networkpolicy-denyall.yaml networkpolicy.networking.k8s.io/deny-all-ingress created# 测试，皆ping不通[22:20:20 root@master1 calico]#curl 10.244.3.4^C[22:21:51 root@master1 calico]#curl 10.244.3.5 ^C[22:22:01 root@master1 calico]#curl 10.244.4.5^C# 设置默认的允许pod管控策略，ingress和egress未写字段，默认允许所有字段[22:23:01 root@master1 calico]#cat 06-calico-networkpolicy-denyall.yaml apiVersion: networking.k8s.io/v1kind: NetworkPolicymetadata: name: deny-all-ingress namespace: developspec: podSelector: {} policyTypes: ["Ingress", "Egress"] egress: - {} ingress: - {}[22:23:06 root@master1 calico]#kubectl apply -f 06-calico-networkpolicy-denyall.yaml networkpolicy.networking.k8s.io/deny-all-ingress created# 测试[22:23:20 root@master1 calico]#curl 10.244.3.4kubernetes pod-test v0.1!! ClientIP: 10.0.0.50, ServerName: pod-deployment1-85bd7684f6-grsw9, ServerIP: 10.244.3.4![22:23:28 root@master1 calico]#curl 10.244.3.5kubernetes pod-test v0.1!! ClientIP: 10.0.0.50, ServerName: pod-deployment1-85bd7684f6-njn6x, ServerIP: 10.244.3.5![22:23:30 root@master1 calico]#curl 10.244.4.5 kubernetes pod-test v0.1!! ClientIP: 10.0.0.50, ServerName: pod-deployment1-85bd7684f6-p9plh, ServerIP: 10.244.4.5!# 仅当前命名空间的所有节点可访问[22:27:31 root@master1 calico]#cat 07-calico-networkpolicy-denyall.yaml apiVersion: networking.k8s.io/v1kind: NetworkPolicymetadata: name: deny-all-ingress namespace: developspec: podSelector: {} policyTypes: ["Ingress", "Egress"] egress: - to: - podSelector: {} ingress: - from: - podSelector: {}[22:27:33 root@master1 calico]#kubectl apply -f 07-calico-networkpolicy-denyall.yaml networkpolicy.networking.k8s.io/deny-all-ingress created[22:28:03 root@master1 calico]#curl 10.244.3.4^C[22:28:37 root@master1 calico]#kubectl get svc -n developNAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGEpod-deployment1 ClusterIP 10.101.254.69 <none> 80/TCP 16m# 测试，在主机ping不通[22:29:00 root@master1 calico]#curl 10.101.254.69^C# 在一个同命名空间可通[22:29:28 root@master1 calico]#kubectl run pod-test --image=10.0.0.55:80/mykubernetes/nginx:1.21.3 -n develop --rm -it --command -- shIf you don't see a command prompt, try pressing enter.# curl 10.101.254.69kubernetes pod-test v0.1!! ClientIP: 10.244.3.6, ServerName: pod-deployment1-85bd7684f6-grsw9, ServerIP: 10.244.3.4!```### 同ns策略```sh# 创建两个测试pod[22:39:10 root@master1 ~]#cd ~[22:39:10 root@master1 ~]#kubectl run pod-test1 --image=10.0.0.55:80/mykubernetes/nginx:1.21.3 -n develop --rm -it --command -- shIf you don't see a command prompt, try pressing enter.#[22:39:12 root@master1 ~]#cd ~[22:39:12 root@master1 ~]#kubectl run pod-test --image=10.0.0.55:80/mykubernetes/nginx:1.21.3 -n develop --rm -it --command -- shIf you don't see a command prompt, try pressing enter.# [22:40:04 root@master1 calico]#kubectl get pod -n develop -o wideNAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATESpod-test 1/1 Running 0 26s 10.244.4.6 node2.noisedu.cn <none> <none>pod-test1 1/1 Running 0 21s 10.244.3.7 node1.noisedu.cn <none> <none># 应用策略，仅当前命名空间的所有节点可访问，并且拒绝10.244.4.6的访问[22:41:56 root@master1 calico]#cat 08-calico-networkpolicy-denyall.yaml apiVersion: networking.k8s.io/v1kind: NetworkPolicymetadata: name: deny-all-ingress namespace: developspec: podSelector: {} policyTypes: ["Ingress", "Egress"] egress: - to: - podSelector: {} ingress: - from: - ipBlock: cidr: 10.244.0.0/16 except: - 10.244.4.6/32 - podSelector: matchLabels: run: pod-test1 ports: - protocol: TCP port: 80# 测试应用前[22:39:12 root@master1 ~]#kubectl run pod-test --image=10.0.0.55:80/mykubernetes/nginx:1.21.3 -n develop --rm -it --command -- shIf you don't see a command prompt, try pressing enter.# curl 10.101.254.69kubernetes pod-test v0.1!! ClientIP: 10.244.4.6, ServerName: pod-deployment1-85bd7684f6-grsw9, ServerIP: 10.244.3.4!# [22:39:10 root@master1 ~]#kubectl run pod-test1 --image=10.0.0.55:80/mykubernetes/nginx:1.21.3 -n develop --rm -it --command -- shIf you don't see a command prompt, try pressing enter.# curl 10.101.254.69kubernetes pod-test v0.1!! ClientIP: 10.244.3.7, ServerName: pod-deployment1-85bd7684f6-njn6x, ServerIP: 10.244.3.5!# # 应用策略[22:41:59 root@master1 calico]#kubectl apply -f 08-calico-networkpolicy-denyall.yaml networkpolicy.networking.k8s.io/deny-all-ingress created# 测试应用后，pod-test1成功，pod-test失败[22:39:10 root@master1 ~]#kubectl run pod-test1 --image=10.0.0.55:80/mykubernetes/nginx:1.21.3 -n develop --rm -it --command -- shIf you don't see a command prompt, try pressing enter.# curl 10.101.254.69kubernetes pod-test v0.1!! ClientIP: 10.244.3.7, ServerName: pod-deployment1-85bd7684f6-njn6x, ServerIP: 10.244.3.5!# curl 10.101.254.69kubernetes pod-test v0.1!! ClientIP: 10.244.3.7, ServerName: pod-deployment1-85bd7684f6-p9plh, ServerIP: 10.244.4.5!# [22:39:12 root@master1 ~]#kubectl run pod-test --image=10.0.0.55:80/mykubernetes/nginx:1.21.3 -n develop --rm -it --command -- shIf you don't see a command prompt, try pressing enter.# curl 10.101.254.69kubernetes pod-test v0.1!! ClientIP: 10.244.4.6, ServerName: pod-deployment1-85bd7684f6-grsw9, ServerIP: 10.244.3.4!# curl 10.101.254.69# 增加出栈规则，允许udp 53端口和tcp80端口[22:45:14 root@master1 calico]#cat 09-calico-networkpolicy-egress.yaml apiVersion: networking.k8s.io/v1kind: NetworkPolicymetadata: name: egress-controller namespace: developspec: podSelector: matchLabels: run: pod-test1 policyTypes: ["Egress"] egress: - to: ports: - protocol: UDP port: 53 - to: - podSelector: matchLabels: run: pod-test1 ports: - protocol: TCP port: 80 ```### 跨ns策略```sh# 允许不是default的ns访问，其他拒绝[22:46:50 root@master1 calico]#cat 10-calico-networkpolicy-ingress.yaml apiVersion: networking.k8s.io/v1kind: NetworkPolicymetadata: name: ingress-controller namespace: developspec: podSelector: {} policyTypes: ["Ingress"] ingress: - from: - namespaceSelector: matchExpressions: - key: kubernetes.io/metadata.name operator: In values: [develop, kube-system, logs] - from: - namespaceSelector: matchExpressions: - {key: kubernetes.io/metadata.name, operator: NotIn, values: ["default"]}[22:46:53 root@master1 calico]#kubectl apply -f 10-calico-networkpolicy-ingress.yaml networkpolicy.networking.k8s.io/ingress-controller created# 测试[22:49:01 root@master1 ~]#kubectl run pod-test --image=10.0.0.55:80/mykubernetes/nginx:1.21.3 -n develop --rm -it --command -- shIf you don't see a command prompt, try pressing enter.# curl 10.101.254.69kubernetes pod-test v0.1!! ClientIP: 10.244.4.7, ServerName: pod-deployment1-85bd7684f6-grsw9, ServerIP: 10.244.3.4!# [22:49:07 root@master1 ~]#kubectl run pod-test1 --image=10.0.0.55:80/mykubernetes/nginx:1.21.3 --rm -it --command -- shIf you don't see a command prompt, try pressing enter.# curl 10.101.254.69^C# # networkpolcy```### NetworkPolicy```sh[22:51:22 root@master1 calico]#cat 11-calico-networkpolicy-global.yaml apiVersion: crd.projectcalico.org/v1kind: GlobalNetworkPolicymetadata: name: namespaces-defaultspec: order: 0.0 namespaceSelector: name not in {"kube-system","kubernetes-dashboard","logs","monitoring"} types: ["Ingress", "Egress"] ingress: - action: Allow source: namespaceSelector: name in {"kube-system","kubernetes-dashboard","logs","monitoring"} egress: - action: Allow[22:51:24 root@master1 calico]#kubectl apply -f 11-calico-networkpolicy-global.yaml globalnetworkpolicy.crd.projectcalico.org/namespaces-default created[22:52:00 root@master1 calico]#kubectl get globalnetworkpolicies.crd.projectcalico.org NAME AGEnamespaces-default 8s[22:52:08 root@master1 calico]#kubectl get globalnetworkpolicyNAME AGEnamespaces-default 17s[22:52:17 root@master1 calico]#kubectl describe globalnetworkpolicies.crd.projectcalico.org namespaces-default Name: namespaces-defaultNamespace: Labels: <none>Annotations: <none>API Version: crd.projectcalico.org/v1Kind: GlobalNetworkPolicyMetadata: Creation Timestamp: 2022-01-02T14:52:00Z Generation: 1 Managed Fields: API Version: crd.projectcalico.org/v1 Fields Type: FieldsV1 fieldsV1: f:metadata: f:annotations: .: f:kubectl.kubernetes.io/last-applied-configuration: f:spec: .: f:egress: f:ingress: f:namespaceSelector: f:order: f:types: Manager: kubectl-client-side-apply Operation: Update Time: 2022-01-02T14:52:00Z Resource Version: 126481 UID: 31210e0b-b665-4a82-bafb-c400d3d0b248Spec: Egress: Action: Allow Ingress: Action: Allow Source: Namespace Selector: name in {"kube-system","kubernetes-dashboard","logs","monitoring"} Namespace Selector: name not in {"kube-system","kubernetes-dashboard","logs","monitoring"} Order: 0 Types: Ingress EgressEvents: <none># 测试，都是超时，因为是defaul的ns，这个global设置不允许default的pod访问。[22:49:07 root@master1 ~]#kubectl run pod-test1 --image=10.0.0.55:80/mykubernetes/nginx:1.21.3 --rm -it --command -- shIf you don't see a command prompt, try pressing enter.# curl 10.101.254.69^C[22:49:01 root@master1 ~]#kubectl run pod-test --image=10.0.0.55:80/mykubernetes/nginx:1.21.3 -n develop --rm -it --command -- shIf you don't see a command prompt, try pressing enter.# curl 10.101.254.69^C# ``` |
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