目录：（可以按w快捷键切换大纲视图）
部署 k3s （禁用 k3s 默认的网络策略控制器和flannel 的后端（默认是 VXLAN））
为了节省资源，也可以禁用 traefik Ingress 控制器。
[root@centos7 ~]# export INSTALL_K3S_VERSION=v1.23.8+k3s1
[root@centos7 ~]# curl -sfL https://get.k3s.io | sh -s - --flannel-backend=none --disable-network-policy --disable=traefik --write-kubeconfig-mode 644 --write-kubeconfig ~/.kube/config
[INFO] Using v1.23.8+k3s1 as release
[INFO] Downloading hash https://github.com/k3s-io/k3s/releases/download/v1.23.8+k3s1/sha256sum-amd64.txt
[INFO] Downloading binary https://github.com/k3s-io/k3s/releases/download/v1.23.8+k3s1/k3s
[INFO] Verifying binary download
[INFO] Installing k3s to /usr/local/bin/k3s
Loaded plugins: fastestmirror, langpacks, product-id, search-disabled-repos, subscription-manager
This system is not registered with an entitlement server. You can use subscription-manager to register.
Loading mirror speeds from cached hostfile
* base: mirrors.cqu.edu.cn
* epel: mirror.01link.hk
* extras: mirrors.huaweicloud.com
* updates: ftp.sjtu.edu.cn
Package yum-utils-1.1.31-54.el7_8.noarch already installed and latest version
Nothing to do
Loaded plugins: fastestmirror, langpacks, product-id, subscription-manager
This system is not registered with an entitlement server. You can use subscription-manager to register.
Loaded plugins: fastestmirror, langpacks, product-id, search-disabled-repos, subscription-manager
This system is not registered with an entitlement server. You can use subscription-manager to register.
Loading mirror speeds from cached hostfile
* base: mirrors.cqu.edu.cn
* epel: mirror.01link.hk
* extras: mirrors.huaweicloud.com
* updates: mirrors.huaweicloud.com
rancher-k3s-common-stable | 2.9 kB 00:00:00
Resolving Dependencies
--> Running transaction check
---> Package k3s-selinux.noarch 0:1.2-2.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
============================================================================================================================================================================================================================================================================ Package Arch Version Repository Size
============================================================================================================================================================================================================================================================================Installing:
k3s-selinux noarch 1.2-2.el7 rancher-k3s-common-stable 16 k
Transaction Summary
============================================================================================================================================================================================================================================================================Install 1 Package
Total download size: 16 k
Installed size: 94 k
Downloading packages:
k3s-selinux-1.2-2.el7.noarch.rpm | 16 kB 00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : k3s-selinux-1.2-2.el7.noarch 1/1
Verifying : k3s-selinux-1.2-2.el7.noarch 1/1
Installed:
k3s-selinux.noarch 0:1.2-2.el7
Complete!
[INFO] Skipping /usr/local/bin/kubectl symlink to k3s, command exists in PATH at /usr/bin/kubectl
[INFO] Creating /usr/local/bin/crictl symlink to k3s
[INFO] Creating /usr/local/bin/ctr symlink to k3s
[INFO] Creating killall script /usr/local/bin/k3s-killall.sh
[INFO] Creating uninstall script /usr/local/bin/k3s-uninstall.sh
[INFO] env: Creating environment file /etc/systemd/system/k3s.service.env
[INFO] systemd: Creating service file /etc/systemd/system/k3s.service
[INFO] systemd: Enabling k3s unit
Created symlink from /etc/systemd/system/multi-user.target.wants/k3s.service to /etc/systemd/system/k3s.service.
[INFO] systemd: Starting k3s
[root@centos7 ~]# kubectl get po -A
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system local-path-provisioner-6c79684f77-6gr8q 0/1 Pending 0 3s
kube-system coredns-d76bd69b-hqtf8 0/1 Pending 0 3s
kube-system metrics-server-7cd5fcb6b7-prxm7 0/1 Pending 0 3s
[root@centos7 ~]# kubectl get no
NAME STATUS ROLES AGE VERSION
centos7 NotReady control-plane,master 14s v1.23.8+k3s1此时检查 pod 和 node 会发现都处于 Pending 状态，这是因为还没安装 CNI。
安装 Kube-OVN
[root@centos7 ~]# wget https://raw.githubusercontent.com/kubeovn/kube-ovn/release-1.10/dist/images/install.sh
--2022-09-14 09:37:29-- https://raw.githubusercontent.com/kubeovn/kube-ovn/release-1.10/dist/images/install.sh
Resolving raw.githubusercontent.com (raw.githubusercontent.com)... 185.199.108.133
Connecting to raw.githubusercontent.com (raw.githubusercontent.com)|185.199.108.133|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 120793 (118K) [text/plain]
Saving to: ‘install.sh’
100%[==================================================================================================================================================================================================================================>] 120,793 --.-K/s in 0.1s
2022-09-14 09:37:30 (1.08 MB/s) - ‘install.sh’ saved [120793/120793]
[root@centos7 ~]# bash install.sh
-------------------------------
Kube-OVN Version: v1.10.6
Default Network Mode: geneve
Default Subnet CIDR: 10.16.0.0/16
Join Subnet CIDR: 100.64.0.0/16
Enable SVC LB: true
Enable Networkpolicy: true
Enable EIP and SNAT: true
Enable Mirror: false
-------------------------------
[Step 1/6] Label kube-ovn-master node and label datapath type
node/centos7 labeled
-------------------------------
[Step 2/6] Install OVN components
Install OVN DB in 192.168.190.133,
customresourcedefinition.apiextensions.k8s.io/vpc-nat-gateways.kubeovn.io created
customresourcedefinition.apiextensions.k8s.io/iptables-eips.kubeovn.io created
customresourcedefinition.apiextensions.k8s.io/iptables-fip-rules.kubeovn.io created
customresourcedefinition.apiextensions.k8s.io/iptables-dnat-rules.kubeovn.io created
customresourcedefinition.apiextensions.k8s.io/iptables-snat-rules.kubeovn.io created
customresourcedefinition.apiextensions.k8s.io/vpcs.kubeovn.io created
customresourcedefinition.apiextensions.k8s.io/ips.kubeovn.io created
customresourcedefinition.apiextensions.k8s.io/vips.kubeovn.io created
customresourcedefinition.apiextensions.k8s.io/subnets.kubeovn.io created
customresourcedefinition.apiextensions.k8s.io/vlans.kubeovn.io created
customresourcedefinition.apiextensions.k8s.io/provider-networks.kubeovn.io created
customresourcedefinition.apiextensions.k8s.io/security-groups.kubeovn.io created
customresourcedefinition.apiextensions.k8s.io/htbqoses.kubeovn.io created
serviceaccount/ovn created
clusterrole.rbac.authorization.k8s.io/system:ovn created
clusterrolebinding.rbac.authorization.k8s.io/ovn created
service/ovn-nb created
service/ovn-sb created
service/ovn-northd created
deployment.apps/ovn-central created
daemonset.apps/ovs-ovn created
Waiting for deployment "ovn-central" rollout to finish: 0 of 1 updated replicas are available...
deployment "ovn-central" successfully rolled out
-------------------------------
[Step 3/6] Install Kube-OVN
deployment.apps/kube-ovn-controller created
daemonset.apps/kube-ovn-cni created
daemonset.apps/kube-ovn-pinger created
deployment.apps/kube-ovn-monitor created
service/kube-ovn-monitor created
service/kube-ovn-pinger created
service/kube-ovn-controller created
service/kube-ovn-cni created
Waiting for deployment "kube-ovn-controller" rollout to finish: 0 of 1 updated replicas are available...
deployment "kube-ovn-controller" successfully rolled out
Waiting for daemon set "kube-ovn-cni" rollout to finish: 0 of 1 updated pods are available...
daemon set "kube-ovn-cni" successfully rolled out
-------------------------------
[Step 4/6] Delete pod that not in host network mode
pod "local-path-provisioner-6c79684f77-6gr8q" deleted
pod "metrics-server-7cd5fcb6b7-prxm7" deleted
pod "coredns-d76bd69b-hqtf8" deleted
pod "kube-ovn-pinger-mrd4l" deleted
daemon set "kube-ovn-pinger" successfully rolled out
deployment "coredns" successfully rolled out
-------------------------------
[Step 5/6] Install kubectl plugin
-------------------------------
[Step 6/6] Run network diagnose
NAME CREATED AT
vpcs.kubeovn.io 2022-09-14T01:38:14Z
NAME CREATED AT
vpc-nat-gateways.kubeovn.io 2022-09-14T01:38:14Z
NAME CREATED AT
subnets.kubeovn.io 2022-09-14T01:38:14Z
NAME CREATED AT
ips.kubeovn.io 2022-09-14T01:38:14Z
NAME CREATED AT
vlans.kubeovn.io 2022-09-14T01:38:14Z
NAME CREATED AT
provider-networks.kubeovn.io 2022-09-14T01:38:14Z
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kube-dns ClusterIP 10.43.0.10 <none> 53/UDP,53/TCP,9153/TCP 7m11s
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.43.0.1 <none> 443/TCP 7m15s
NAME SECRETS AGE
ovn 1 2m4s
NAME CREATED AT
system:ovn 2022-09-14T01:38:14Z
NAME ROLE AGE
ovn ClusterRole/system:ovn 2m4s
NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
centos7 Ready control-plane,master 7m4s v1.23.8+k3s1 192.168.190.133 <none> CentOS Linux 7 (Core) 3.10.0-1160.76.1.el7.x86_64 containerd://1.5.13-k3s1
switch 67e3aeee-9fe2-4722-9778-27b4e382f1f0 (join)
port join-ovn-cluster
type: router
router-port: ovn-cluster-join
port node-centos7
addresses: ["00:00:00:72:12:B7 100.64.0.2"]
switch 66aa7f8b-5526-44cc-8edc-9a1b010ea684 (ovn-default)
port metrics-server-7cd5fcb6b7-58xj7.kube-system
addresses: ["00:00:00:5A:2A:2F 10.16.0.7"]
port local-path-provisioner-6c79684f77-zr9fx.kube-system
addresses: ["00:00:00:02:11:03 10.16.0.6"]
port kube-ovn-pinger-s7cjv.kube-system
addresses: ["00:00:00:BA:EF:7C 10.16.0.9"]
port ovn-default-ovn-cluster
type: router
router-port: ovn-cluster-ovn-default
port coredns-d76bd69b-7t9jb.kube-system
addresses: ["00:00:00:DE:F7:A4 10.16.0.8"]
router 3ead6079-d708-46d3-98d8-b43312e128ae (ovn-cluster)
port ovn-cluster-ovn-default
mac: "00:00:00:E8:28:1F"
networks: ["10.16.0.1/16"]
port ovn-cluster-join
mac: "00:00:00:77:7C:5C"
networks: ["100.64.0.1/16"]
Routing Policies
31000 ip4.dst == 10.16.0.0/16 allow
31000 ip4.dst == 100.64.0.0/16 allow
30000 ip4.dst == 192.168.190.133 reroute 100.64.0.2
29000 ip4.src == $ovn.default.centos7_ip4 reroute 100.64.0.2
IPv4 Routes
Route Table <main>:
0.0.0.0/0 100.64.0.1 dst-ip
UUID LB PROTO VIP IPs
34df7fe2-ca0e-4060-8b3e-dd7c6fc2b29a cluster-tcp-load tcp 10.43.0.10:53 10.16.0.8:53
tcp 10.43.0.10:9153 10.16.0.8:9153
tcp 10.43.0.1:443 192.168.190.133:6443
tcp 10.43.20.90:8080 10.16.0.9:8080
tcp 10.43.209.155:6642 192.168.190.133:6642
tcp 10.43.251.8:10660 192.168.190.133:10660
tcp 10.43.255.251:6643 192.168.190.133:6643
tcp 10.43.84.40:6641 192.168.190.133:6641
tcp 10.43.85.116:10665 192.168.190.133:10665
tcp 10.43.85.245:10661 192.168.190.133:10661
83dd5107-466a-4983-add6-da49b8e39b2f cluster-udp-load udp 10.43.0.10:53 10.16.0.8:53
_uuid : 5337495c-008e-43fb-b463-fe5298f0234f
action : drop
direction : to-lport
external_ids : {}
label : 0
log : false
match : "outport==@ovn.sg.kubeovn_deny_all && ip"
meter : []
name : []
options : {}
priority : 2003
severity : []
_uuid : 418cb28c-aa4f-47b5-96f0-3d42f0bbdb35
action : drop
direction : from-lport
external_ids : {}
label : 0
log : false
match : "inport==@ovn.sg.kubeovn_deny_all && ip"
meter : []
name : []
options : {}
priority : 2003
severity : []
Chassis "44d5e7fb-c137-4aad-865e-c02e429fc913"
hostname: centos7
Encap geneve
ip: "192.168.190.133"
options: {csum="true"}
Port_Binding kube-ovn-pinger-s7cjv.kube-system
Port_Binding node-centos7
Port_Binding coredns-d76bd69b-7t9jb.kube-system
Port_Binding metrics-server-7cd5fcb6b7-58xj7.kube-system
Port_Binding local-path-provisioner-6c79684f77-zr9fx.kube-system
Defaulted container "cni-server" out of: cni-server, install-cni (init)
command terminated with exit code 7
centos7 kube-proxy's health check failed检查状态
[root@centos7 ~]# kubectl get no -o wide
NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
centos7 Ready control-plane,master 15m v1.23.8+k3s1 192.168.190.133 <none> CentOS Linux 7 (Core) 3.10.0-1160.76.1.el7.x86_64 containerd://1.5.13-k3s1
[root@centos7 ~]# kubectl get po -A
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system ovs-ovn-k4rlg 1/1 Running 0 10m
kube-system kube-ovn-controller-db7d548b5-6h5c5 1/1 Running 0 10m
kube-system kube-ovn-monitor-5f8f5dbfc-5qsh2 1/1 Running 0 9m59s
kube-system ovn-central-979fc8d55-w8zm5 1/1 Running 0 10m
kube-system kube-ovn-cni-nf5gb 1/1 Running 0 10m
kube-system local-path-provisioner-6c79684f77-zr9fx 1/1 Running 0 9m24s
kube-system coredns-d76bd69b-7t9jb 1/1 Running 0 8m45s
kube-system kube-ovn-pinger-s7cjv 1/1 Running 0 8m43s
kube-system metrics-server-7cd5fcb6b7-58xj7 1/1 Running 0 8m47s
[root@centos7 ~]# kubectl get Subnet
NAME PROVIDER VPC PROTOCOL CIDR PRIVATE NAT DEFAULT GATEWAYTYPE V4USED V4AVAILABLE V6USED V6AVAILABLE EXCLUDEIPS
join ovn ovn-cluster IPv4 100.64.0.0/16 distributed 1 65532 0 0 ["100.64.0.1"]
ovn-default ovn ovn-cluster IPv4 10.16.0.0/16 true true distributed 4 65529 0 0 ["10.16.0.1"]
[root@centos7 ~]# cat install.sh
...
REGISTRY="kubeovn"
VERSION="v1.10.6"
IMAGE_PULL_POLICY="IfNotPresent"
POD_CIDR="10.16.0.0/16" # Do NOT overlap with NODE/SVC/JOIN CIDR
POD_GATEWAY="10.16.0.1"
SVC_CIDR="10.96.0.0/12" # Do NOT overlap with NODE/POD/JOIN CIDR
JOIN_CIDR="100.64.0.0/16" # Do NOT overlap with NODE/POD/SVC CIDR
...发现装好Kube-OVN后默认有一个subnet，且该subnet的CIDR范围和部署脚本中的配置一致。
至此 k3s 和 kube-ovn 就安装完成了，下面简单体验下 kube-ovn 的功能。
Kube-OVN 的简单使用 - 创建一个子网并在该子网上创建一个pod
创建一个新的namespace：another，并让该namespace归属于新创建的子网another-subnet 10.66.0.0/16 下。
[root@centos7 ~]# kubectl apply -f - <<EOF
apiVersion: v1
kind: Namespace
metadata:
creationTimestamp: null
name: another
---
apiVersion: kubeovn.io/v1
kind: Subnet
metadata:
name: another-subnet
spec:
protocol: IPv4
cidrBlock: 10.66.0.0/16
excludeIps:
- 10.66.0.1
gateway: 10.66.0.1
gatewayType: distributed
natOutgoing: true
namespaces:
- another
EOF
namespace/another created
subnet.kubeovn.io/another-subnet created
[root@centos7 ~]# kubectl get Subnet
NAME PROVIDER VPC PROTOCOL CIDR PRIVATE NAT DEFAULT GATEWAYTYPE V4USED V4AVAILABLE V6USED V6AVAILABLE EXCLUDEIPS
join ovn ovn-cluster IPv4 100.64.0.0/16 distributed 1 65532 0 0 ["100.64.0.1"]
ovn-default ovn ovn-cluster IPv4 10.16.0.0/16 true true distributed 4 65529 0 0 ["10.16.0.1"]
another-subnet ovn ovn-cluster IPv4 10.66.0.0/16 true distributed 0 65533 0 0 ["10.66.0.1"]可以查看到刚刚创建的子网，ipv4的使用数还是0，下面在该子网下创建一个pod（curl客户端）。并在default命名空间（对应着默认的子网ovn-default 10.16.0.0/16创建一个pod（python的httpd服务端））。
[root@centos7 ~]# kubectl run curl --image rancher/curl --command sleep 1d -n another
pod/curl created
[root@centos7 ~]# kubectl get po -o wide -n another
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
curl 1/1 Running 0 44s 10.66.0.2 centos7 <none> <none>
[root@centos7 ~]# kubectl run pipy --image flomesh/pipy:latest -n default
pod/pipy created
[root@centos7 ~]# kubectl get po -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
pipy 1/1 Running 0 27s 10.16.0.10 centos7 <none> <none>
[root@centos7 ~]# kubectl get Subnet
NAME PROVIDER VPC PROTOCOL CIDR PRIVATE NAT DEFAULT GATEWAYTYPE V4USED V4AVAILABLE V6USED V6AVAILABLE EXCLUDEIPS
join ovn ovn-cluster IPv4 100.64.0.0/16 distributed 1 65532 0 0 ["100.64.0.1"]
another-subnet ovn ovn-cluster IPv4 10.66.0.0/16 true distributed 1 65532 0 0 ["10.66.0.1"]
ovn-default ovn ovn-cluster IPv4 10.16.0.0/16 true true distributed 5 65528 0 0 ["10.16.0.1"]
[root@centos7 ~]# kubectl exec -it curl -n another -- curl -i 10.16.0.10:8080
HTTP/1.1 200 OK
content-length: 11
connection: keep-alive
Hi, there!查看子网信息，由于在两个子网分别创建了pod，ipv4使用数各自增加了1。客户端可以访问服务端。
Kube-OVN 的简单使用 - 使用 Kube-OVN 的 ACL 规则
在默认子网上创建一条ACL规则，drop掉来自10.66.0.0/16的数据包。发现客户端已不能访问服务端。
[root@centos7 ~]# kubectl edit subnet ovn-default
subnet.kubeovn.io/ovn-default edited
# 在sepc: 最后加上一段
acls:
- action: drop
direction: from-lport
match: ip4.src == 10.66.0.0/16 && ip
priority: 1002
[root@centos7 ~]# kubectl exec -it curl -n another -- curl -i 10.16.0.10:8080 --connect-timeout 2
curl: (28) Connection timed out after 2001 milliseconds
command terminated with exit code 28下面是edit后的子网信息：
apiVersion: kubeovn.io/v1
kind: Subnet
metadata:
creationTimestamp: "2022-09-14T01:39:01Z"
finalizers:
- kube-ovn-controller
generation: 1
name: ovn-default
resourceVersion: "2239"
uid: 18f4374f-bf83-44eb-b551-ada43af4bad8
spec:
cidrBlock: 10.16.0.0/16
default: true
excludeIps:
- 10.16.0.1
gateway: 10.16.0.1
gatewayType: distributed
natOutgoing: true
protocol: IPv4
provider: ovn
vpc: ovn-cluster
acls:
- action: drop
direction: from-lport
match: ip4.src == 10.66.0.0/16 && ip
priority: 1002
status:
activateGateway: ""
conditions:
- lastTransitionTime: "2022-09-14T01:39:07Z"
lastUpdateTime: "2022-09-14T01:39:08Z"
reason: ResetLogicalSwitchAclSuccess
status: "True"
type: Validated
- lastTransitionTime: "2022-09-14T01:39:07Z"
lastUpdateTime: "2022-09-14T01:39:07Z"
reason: ResetLogicalSwitchAclSuccess
status: "True"
type: Ready
- lastTransitionTime: "2022-09-14T01:39:07Z"
lastUpdateTime: "2022-09-14T01:39:07Z"
message: Not Observed
reason: Init
status: Unknown
type: Error
dhcpV4OptionsUUID: ""
dhcpV6OptionsUUID: ""
v4availableIPs: 65528
v4usingIPs: 5
v6availableIPs: 0
v6usingIPs: 0转载请注明来源，欢迎指出任何有错误或不够清晰的表达。可以邮件至 backendcloud@gmail.com
