flannel的集群、POD访问内网rds、slb实例的网络过程？

Flannel是一个开源的网络编程库，主要用于Kubernetes集群中的网络拓扑和IP地址规划。它可以将多个Pod聚合到一个虚拟的网络中，使得这些Pod可以像单个节点一样访问网络资源。
下面是使用Flannel进行集群、POD访问内网RDS和SLB实例的网络过程：

部署Flannel：在Kubernetes集群中部署Flannel，可以通过kubectl命令进行部署。例如，使用以下命令部署Flannel：
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kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.12.0/Documentation/kube-flannel.yml
创建网络：使用Flannel创建一个网络，可以通过以下命令进行创建：
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kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.12.0/Documentation/advanced-networking.yml
配置Pod访问内网RDS和SLB实例：在Pod配置文件中添加Flannel的命名空间和网络接口信息，以便Pod可以访问内网RDS和SLB实例。例如，可以使用以下命令配置Pod访问内网RDS：
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kubectl edit pod/my-pod -n my-network
在Pod配置文件中添加以下内容：

yaml
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apiVersion: v1
kind: Pod
metadata:
name: my-pod
spec:
containers:

• name: my-container
  image: my-image
  command: ["/bin/bash"]
  args: ["-c", "sleep 1000"]
  networks:
• name: my-network
  ipam:
  config:

  - subnet: 10.0.0.0/16
    cidr: 10.0.0.0/24
    gateway: 10.0.0.1
  - subnet: 10.0.1.0/16
    cidr: 10.0.1.0/24
    gateway: 10.0.1.1
  

  volumeMounts:
• mountPath: /var/run/docker.sock
  name: docker-sock
• mountPath: /etc/resolv.conf
  name: resolv.conf
• mountPath: /etc/hosts
  name: hosts
• mountPath: /etc/netplan
  name: netplan.conf
• mountPath: /etc/NetworkManager/NetworkManager.conf
  name: network-manager.conf
• mountPath: /etc/iptables/rules
  name: iptables-rules
• mountPath: /etc/iptables/chain
  name: iptables-chain
• mountPath: /etc/iptables/ipv6
  name: iptables-ipv6
• mountPath: /etc/netfilter/iptables/iptables
  name: iptablesiptables
• mountPath: /etc/netfilter/iptables/ipv6
  name: iptablesipv6iptables
• mountPath: /etc/netfilter/nf_nat
  name: nf_nat
• mountPath: /etc/netfilter/nf_conntrack
  name: nf_conntrack
• mountPath: /etc/netfilter/nf_tables
  name: nf_tables
• mountPath: /etc/netfilter/nf_conntrack
  name: nf_conntrack
• mountPath: /etc/netfilter/nf_nat
  name: nf_nat
• mountPath: /etc/netfilter/nf_conntrack
  name: nf_conntrack
• mountPath: /etc/netfilter/nf_tables
  name: nf_tables
• mountPath: /etc/netfilter/nf_conntrack
  name: nf_conntrack
• mountPath: /etc/netfilter/nf_nat
  name: nf_nat
• mountPath: /etc/netfilter/nf_conntrack
  name: nf_conntrack
• mountPath: /etc/netfilter/nf_tables
  name: nf_tables
• mountPath: /etc/netfilter/nf_conntrack
  name: nf_conntrack
• mountPath: /etc/netfilter/nf_nat
  name: nf_nat
• mountPath: /etc/netfilter/nf_conntrack
  name: nf_conntrack
• mountPath: /etc/netfilter/nf_tables
  name: nf_tables
• mountPath: /etc/netfilter/nf_conntrack
  name: nf_conntrack
• mountPath: /etc/netfilter/nf_nat
  name: nf_nat
• mountPath: /etc/netfilter/nf_conntrack
  name: nf_conntrack
• mountPath: /etc/netfilter/nf_tables
  name: nf_tables
• mountPath: /etc/netfilter/nf_conntrack
  name: nf_conntrack
• mountPath: /etc/netfilter/nf_nat
  name: nf_nat
• mountPath: /etc/netfilter/nf_conntrack
  name: nf_conntrack
• mountPath: /etc/netfilter/nf_tables
  name: nf_tables
• mountPath: /etc/netfilter/nf_conntrack
  name: nf_conntrack
• mountPath: /etc/netfilter/nf_nat
  name: nf_nat
• mountPath: /etc/netfilter/nf_conntrack
  name: nf_conntrack
• mountPath: /etc/netfilter/nf_tables
  name: nf_tables
• mountPath: /etc/netfilter/nf_conntrack
  name: nf_conntrack
• mountPath: /etc/netfilter/nf_nat
  name: nf_nat
• mountPath: /etc/netfilter/nf_conntrack
  name: nf_conntrack
• mountPath: /etc/netfilter/nf_tables
  name: nf_tables
• mountPath: /etc/netfilter/nf_conntrack
  name: nf_conntrack
• mountPath: /etc/netfilter/nf_nat
  name: nf_nat
• mountPath: /etc/netfilter/nf_conntrack
  name: nf_conntrack
• mountPath: /etc/netfilter/nf_tables
  name: nf_tables
• mountPath: /etc/netfilter/nf_conntrack
  name: nf_conntrack
• mountPath: /etc/netfilter/nf_nat
  name: nf_nat
• mountPath: /etc/netfilter/nf_conntrack
  name: nf_conntrack
• mountPath: /etc/netfilter/nf_tables
  name: nf_tables
• mountPath: /etc/netfilter/nf_conntrack
  name: nf_conntrack
• mountPath: /etc/netfilter

我们可以假设slb是在集群外的slb。flannel总共包括应用层、传输层、网络层以及网卡四个部分。

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