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6.4. 路由公告设置示例

作为集群管理员，您可以为集群配置以下示例路由公告设置。此配置旨在作为演示如何配置路由广告的示例。

6.4.1. 路由公告设置示例
复制链接

作为集群管理员，您可以为集群启用边框网关协议(BGP)路由支持。此配置旨在作为演示如何配置路由广告的示例。配置使用路由反映而不是完整的网格设置。

注意

BGP 路由只在裸机基础架构上被支持。

先决条件

  • 已安装 OpenShift CLI（oc）。
  • 以具有 cluster-admin 权限的用户身份登录集群。
  • 集群安装在裸机基础架构上。
  • 您有一个裸机系统，可访问集群，在其中计划运行 FRR 守护进程容器。

流程

  1. 运行以下命令确认启用了 RouteAdvertisements 功能门： 

    $ oc get featuregate -oyaml | grep -i routeadvertisement

    输出示例

          - name: RouteAdvertisements

  2. 运行以下命令配置 Cluster Network Operator (CNO)： 

    $ oc patch Network.operator.openshift.io cluster --type=merge \
  -p='
    {"spec":{
      "additionalRoutingCapabilities": {
        "providers": ["FRR"]},
        "defaultNetwork":{"ovnKubernetesConfig"{
          "routeAdvertisements":"Enabled"
          }}}}'

    CNO 重启所有节点可能需要几分钟时间。

  3. 运行以下命令，获取节点的 IP 地址： 

    $ oc get node -owide

    输出示例

    NAME                                       STATUS   ROLES                  AGE   VERSION   INTERNAL-IP      EXTERNAL-IP   OS-IMAGE                                                KERNEL-VERSION                 CONTAINER-RUNTIME
master-0                                   Ready    control-plane,master   27h   v1.31.3   192.168.111.20   <none>        Red Hat Enterprise Linux CoreOS 418.94.202501062026-0   5.14.0-427.50.1.el9_4.x86_64   cri-o://1.31.4-2.rhaos4.18.git33d7598.el9
master-1                                   Ready    control-plane,master   27h   v1.31.3   192.168.111.21   <none>        Red Hat Enterprise Linux CoreOS 418.94.202501062026-0   5.14.0-427.50.1.el9_4.x86_64   cri-o://1.31.4-2.rhaos4.18.git33d7598.el9
master-2                                   Ready    control-plane,master   27h   v1.31.3   192.168.111.22   <none>        Red Hat Enterprise Linux CoreOS 418.94.202501062026-0   5.14.0-427.50.1.el9_4.x86_64   cri-o://1.31.4-2.rhaos4.18.git33d7598.el9
worker-0                                   Ready    worker                 27h   v1.31.3   192.168.111.23   <none>        Red Hat Enterprise Linux CoreOS 418.94.202501062026-0   5.14.0-427.50.1.el9_4.x86_64   cri-o://1.31.4-2.rhaos4.18.git33d7598.el9
worker-1                                   Ready    worker                 27h   v1.31.3   192.168.111.24   <none>        Red Hat Enterprise Linux CoreOS 418.94.202501062026-0   5.14.0-427.50.1.el9_4.x86_64   cri-o://1.31.4-2.rhaos4.18.git33d7598.el9
worker-2                                   Ready    worker                 27h   v1.31.3   192.168.111.25   <none>        Red Hat Enterprise Linux CoreOS 418.94.202501062026-0   5.14.0-427.50.1.el9_4.x86_64   cri-o://1.31.4-2.rhaos4.18.git33d7598.el9

  4. 运行以下命令，获取每个节点的默认 pod 网络： 

    $ oc get node <node_name> -o=jsonpath={.metadata.annotations.k8s\\.ovn\\.org/node-subnets}

    输出示例

    {"default":["10.129.0.0/23"],"ns1.udn-network-primary-layer3":["10.150.6.0/24"]}

  5. 在裸机虚拟机监控程序上，运行以下命令来获取要使用的外部 FRR 容器的 IP 地址： 

    $ ip -j -d route get <a cluster node's IP> | jq -r '.[] | .dev' | xargs ip -d -j address show | jq -r '.[] | .addr_info[0].local'

  6. 为 FRR 创建一个 frr.conf 文件，其中包含每个节点的 IP 地址，如下例所示：

    frr.conf 配置文件示例

    router bgp 64512
 no bgp default ipv4-unicast
 no bgp default ipv6-unicast
 no bgp network import-check
 neighbor 192.168.111.20 remote-as 64512
 neighbor 192.168.111.20 route-reflector-client
 neighbor 192.168.111.21 remote-as 64512
 neighbor 192.168.111.21 route-reflector-client
 neighbor 192.168.111.22 remote-as 64512
 neighbor 192.168.111.22 route-reflector-client
 neighbor 192.168.111.40 remote-as 64512
 neighbor 192.168.111.40 route-reflector-client
 neighbor 192.168.111.47 remote-as 64512
 neighbor 192.168.111.47 route-reflector-client
 neighbor 192.168.111.23 remote-as 64512
 neighbor 192.168.111.23 route-reflector-client
 neighbor 192.168.111.24 remote-as 64512
 neighbor 192.168.111.24 route-reflector-client
 neighbor 192.168.111.25 remote-as 64512
 neighbor 192.168.111.25 route-reflector-client
 address-family ipv4 unicast
  network 192.168.1.0/24
  network 192.169.1.1/32
 exit-address-family
 address-family ipv4 unicast
  neighbor 192.168.111.20 activate
  neighbor 192.168.111.20 next-hop-self
  neighbor 192.168.111.21 activate
  neighbor 192.168.111.21 next-hop-self
  neighbor 192.168.111.22 activate
  neighbor 192.168.111.22 next-hop-self
  neighbor 192.168.111.40 activate
  neighbor 192.168.111.40 next-hop-self
  neighbor 192.168.111.47 activate
  neighbor 192.168.111.47 next-hop-self
  neighbor 192.168.111.23 activate
  neighbor 192.168.111.23 next-hop-self
  neighbor 192.168.111.24 activate
  neighbor 192.168.111.24 next-hop-self
  neighbor 192.168.111.25 activate
  neighbor 192.168.111.25 next-hop-self
 exit-address-family
 neighbor  remote-as 64512
 neighbor  route-reflector-client
 address-family ipv6 unicast
  network 2001:db8::/128
 exit-address-family
 address-family ipv6 unicast
  neighbor  activate
  neighbor  next-hop-self
 exit-address-family

  7. 创建名为 daemons 的文件，其中包含以下内容：

    daemons 配置文件示例

    # This file tells the frr package which daemons to start.
#
# Sample configurations for these daemons can be found in
# /usr/share/doc/frr/examples/.
#
# ATTENTION:
#
# When activating a daemon for the first time, a config file, even if it is
# empty, has to be present *and* be owned by the user and group "frr", else
# the daemon will not be started by /etc/init.d/frr. The permissions should
# be u=rw,g=r,o=.
# When using "vtysh" such a config file is also needed. It should be owned by
# group "frrvty" and set to ug=rw,o= though. Check /etc/pam.d/frr, too.
#
# The watchfrr and zebra daemons are always started.
#
bgpd=yes
ospfd=no
ospf6d=no
ripd=no
ripngd=no
isisd=no
pimd=no
ldpd=no
nhrpd=no
eigrpd=no
babeld=no
sharpd=no
pbrd=no
bfdd=yes
fabricd=no
vrrpd=no

#
# If this option is set the /etc/init.d/frr script automatically loads
# the config via "vtysh -b" when the servers are started.
# Check /etc/pam.d/frr if you intend to use "vtysh"!
#
vtysh_enable=yes
zebra_options="  -A 127.0.0.1 -s 90000000"
bgpd_options="   -A 127.0.0.1"
ospfd_options="  -A 127.0.0.1"
ospf6d_options=" -A ::1"
ripd_options="   -A 127.0.0.1"
ripngd_options=" -A ::1"
isisd_options="  -A 127.0.0.1"
pimd_options="   -A 127.0.0.1"
ldpd_options="   -A 127.0.0.1"
nhrpd_options="  -A 127.0.0.1"
eigrpd_options=" -A 127.0.0.1"
babeld_options=" -A 127.0.0.1"
sharpd_options=" -A 127.0.0.1"
pbrd_options="   -A 127.0.0.1"
staticd_options="-A 127.0.0.1"
bfdd_options="   -A 127.0.0.1"
fabricd_options="-A 127.0.0.1"
vrrpd_options="  -A 127.0.0.1"

# configuration profile
#
#frr_profile="traditional"
#frr_profile="datacenter"

#
# This is the maximum number of FD's that will be available.
# Upon startup this is read by the control files and ulimit
# is called. Uncomment and use a reasonable value for your
# setup if you are expecting a large number of peers in
# say BGP.
#MAX_FDS=1024

# The list of daemons to watch is automatically generated by the init script.
#watchfrr_options=""

# for debugging purposes, you can specify a "wrap" command to start instead
# of starting the daemon directly, e.g. to use valgrind on ospfd:
#   ospfd_wrap="/usr/bin/valgrind"
# or you can use "all_wrap" for all daemons, e.g. to use perf record:
#   all_wrap="/usr/bin/perf record --call-graph -"
# the normal daemon command is added to this at the end.

  8. 将 frr.conf 和 daemons 文件保存在同一目录中，如 /tmp/frr。

  9. 运行以下命令来创建外部 FRR 容器： 

    $ sudo podman run -d --privileged --network host --rm --ulimit core=-1 --name frr --volume /tmp/frr:/etc/frr quay.io/frrouting/frr:9.1.0

  10. 创建以下 FRRConfiguration 和 RouteAdvertisements 配置：

    1. 创建一个包含以下内容的 receive_all.yaml 文件：

      receive_all.yaml 配置文件示例

      apiVersion: frrk8s.metallb.io/v1beta1
kind: FRRConfiguration
metadata:
  name: receive-all
  namespace: openshift-frr-k8s
spec:
  bgp:
    routers:
    - asn: 64512
      neighbors:
      - address: 192.168.111.1
        asn: 64512
        toReceive:
          allowed:
            mode: all

    2. 创建一个包含以下内容的 ra.yaml 文件：

      ra.yaml 配置文件示例

      apiVersion: k8s.ovn.org/v1
kind: RouteAdvertisements
metadata:
  name: default
spec:
  nodeSelector: {}
  frrConfigurationSelector: {}
  networkSelectors:
  - networkSelectionType: DefaultNetwork
  advertisements:
  - "PodNetwork"
  - "EgressIP"

  11. 运行以下命令应用 receive_all.yaml 和 ra.yaml 文件： 

    $ for f in receive_all.yaml ra.yaml; do oc apply -f $f; done

验证

  1. 验证配置是否已应用：

    1. 运行以下命令验证 FRRConfiguration 配置是否已创建： 

      $ oc get frrconfiguration -A

      输出示例

      NAMESPACE           NAME                   AGE
openshift-frr-k8s   ovnk-generated-6lmfb   4h47m
openshift-frr-k8s   ovnk-generated-bhmnm   4h47m
openshift-frr-k8s   ovnk-generated-d2rf5   4h47m
openshift-frr-k8s   ovnk-generated-f958l   4h47m
openshift-frr-k8s   ovnk-generated-gmsmw   4h47m
openshift-frr-k8s   ovnk-generated-kmnqg   4h47m
openshift-frr-k8s   ovnk-generated-wpvgb   4h47m
openshift-frr-k8s   ovnk-generated-xq7v6   4h47m
openshift-frr-k8s   receive-all            4h47m

    2. 运行以下命令验证 RouteAdvertisements 配置是否已创建： 

      $ oc get ra -A

      输出示例

      NAME      STATUS
default   Accepted

  2. 运行以下命令来获取外部 FRR 容器 ID： 

    $ sudo podman ps | grep frr

    输出示例

    22cfc713890e  quay.io/frrouting/frr:9.1.0              /usr/lib/frr/dock...  5 hours ago   Up 5 hours ago               frr

  3. 使用您在上一步中获取的容器 ID 检查外部 FRR 容器的 vtysh 会话中的 BGP 邻居和路由。运行以下命令: 

    $ sudo podman exec -it <container_id> vtysh -c "show ip bgp"

    输出示例

    BGP table version is 10, local router ID is 192.168.111.1, vrf id 0
Default local pref 100, local AS 64512
Status codes:  s suppressed, d damped, h history, * valid, > best, = multipath,
               i internal, r RIB-failure, S Stale, R Removed
Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self
Origin codes:  i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

    Network          Next Hop            Metric LocPrf Weight Path
 *>i10.128.0.0/23    192.168.111.22           0    100      0 i
 *>i10.128.2.0/23    192.168.111.23           0    100      0 i
 *>i10.129.0.0/23    192.168.111.20           0    100      0 i
 *>i10.129.2.0/23    192.168.111.24           0    100      0 i
 *>i10.130.0.0/23    192.168.111.21           0    100      0 i
 *>i10.130.2.0/23    192.168.111.40           0    100      0 i
 *>i10.131.0.0/23    192.168.111.25           0    100      0 i
 *>i10.131.2.0/23    192.168.111.47           0    100      0 i
 *> 192.168.1.0/24   0.0.0.0                  0         32768 i
 *> 192.169.1.1/32   0.0.0.0                  0         32768 i

  4. 运行以下命令，为每个集群节点查找 frr-k8s pod： 

    $ oc -n openshift-frr-k8s get pod -owide

    输出示例

    NAME                                      READY   STATUS    RESTARTS   AGE   IP               NODE                                       NOMINATED NODE   READINESS GATES
frr-k8s-86wmq                             6/6     Running   0          25h   192.168.111.20   master-0                                   <none>           <none>
frr-k8s-h2wl6                             6/6     Running   0          25h   192.168.111.21   master-1                                   <none>           <none>
frr-k8s-jlbgs                             6/6     Running   0          25h   192.168.111.40   node1.example.com   <none>           <none>
frr-k8s-qc6l5                             6/6     Running   0          25h   192.168.111.25   worker-2                                   <none>           <none>
frr-k8s-qtxdc                             6/6     Running   0          25h   192.168.111.47   node2.example.com   <none>           <none>
frr-k8s-s5bxh                             6/6     Running   0          25h   192.168.111.24   worker-1                                   <none>           <none>
frr-k8s-szgj9                             6/6     Running   0          25h   192.168.111.22   master-2                                   <none>           <none>
frr-k8s-webhook-server-6cd8b8d769-kmctw   1/1     Running   0          25h   10.131.2.9       node3.example.com   <none>           <none>
frr-k8s-zwmgh                             6/6     Running   0          25h   192.168.111.23   worker-0                                   <none>           <none>

  5. 在 OpenShift Container Platform 集群中，运行以下命令来检查 FRR 容器中集群节点 frr-k8s pod 上的 BGP 路由： 

    $ oc -n openshift-frr-k8s -c frr rsh frr-k8s-86wmq

  6. 运行以下命令，检查集群节点的 IP 路由： 

    sh-5.1# vtysh

    输出示例

    Hello, this is FRRouting (version 8.5.3).
Copyright 1996-2005 Kunihiro Ishiguro, et al.

  7. 运行以下命令检查 IP 路由： 

    worker-2# show ip bgp

    输出示例

    BGP table version is 10, local router ID is 192.168.111.25, vrf id 0
Default local pref 100, local AS 64512
Status codes:  s suppressed, d damped, h history, * valid, > best, = multipath,
               i internal, r RIB-failure, S Stale, R Removed
Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self
Origin codes:  i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

    Network          Next Hop            Metric LocPrf Weight Path
 *>i10.128.0.0/23    192.168.111.22           0    100      0 i
 *>i10.128.2.0/23    192.168.111.23           0    100      0 i
 *>i10.129.0.0/23    192.168.111.20           0    100      0 i
 *>i10.129.2.0/23    192.168.111.24           0    100      0 i
 *>i10.130.0.0/23    192.168.111.21           0    100      0 i
 *>i10.130.2.0/23    192.168.111.40           0    100      0 i
 *> 10.131.0.0/23    0.0.0.0                  0         32768 i
 *>i10.131.2.0/23    192.168.111.47           0    100      0 i
 *>i192.168.1.0/24   192.168.111.1            0    100      0 i
 *>i192.169.1.1/32   192.168.111.1            0    100      0 i

Displayed  10 routes and 10 total paths

  8. 在 OpenShift Container Platform 集群中，运行以下命令来调试节点： 

    $ oc debug node/<node_name>

    输出示例

    Temporary namespace openshift-debug-lbtgh is created for debugging node...
Starting pod/worker-2-debug-zrg4v ...
To use host binaries, run `chroot /host`
Pod IP: 192.168.111.25
If you don't see a command prompt, try pressing enter.

  9. 运行以下命令确认 BGP 路由正在公告： 

    sh-5.1# ip route show | grep bgp

    输出示例

    10.128.0.0/23 nhid 268 via 192.168.111.22 dev br-ex proto bgp metric 20
10.128.2.0/23 nhid 259 via 192.168.111.23 dev br-ex proto bgp metric 20
10.129.0.0/23 nhid 260 via 192.168.111.20 dev br-ex proto bgp metric 20
10.129.2.0/23 nhid 261 via 192.168.111.24 dev br-ex proto bgp metric 20
10.130.0.0/23 nhid 266 via 192.168.111.21 dev br-ex proto bgp metric 20
10.130.2.0/23 nhid 262 via 192.168.111.40 dev br-ex proto bgp metric 20
10.131.2.0/23 nhid 263 via 192.168.111.47 dev br-ex proto bgp metric 20
192.168.1.0/24 nhid 264 via 192.168.111.1 dev br-ex proto bgp metric 20
192.169.1.1 nhid 264 via 192.168.111.1 dev br-ex proto bgp metric 20

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