安装socat
网络允许的话，可以使用yum install -y socat进行安装。
如果是在容器里面运行，建议使用静态链接的socat:
可以从此处下载： Release socat-v1.7.4.4 · ernw/static-toolbox · GitHub
确定网络接口地址和组播地址
#kubectl exec -it pod-node2 -- ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:00:00:F6:DE:E2
inet addr:101.16.0.118 Bcast:101.16.255.255 Mask:255.255.0.0
inet6 addr: fe80::200:ff:fef6:dee2/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1400 Metric:1
RX packets:117 errors:0 dropped:0 overruns:0 frame:0
TX packets:74 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:8063 (7.8 KiB) TX bytes:4308 (4.2 KiB)
#kubectl exec -it pod-node3 -- ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:00:00:60:52:4B
inet addr:101.16.0.119 Bcast:101.16.255.255 Mask:255.255.0.0
inet6 addr: fe80::200:ff:fe60:524b/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1400 Metric:1
RX packets:118 errors:0 dropped:0 overruns:0 frame:0
TX packets:50 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:8090 (7.9 KiB) TX bytes:2925 (2.8 KiB)验证组播multicast
server侧运行命令行：
kubectl exec -it pod-node2 -- /usr/bin/socat-1.7.4.4-x86_64 -d UDP4-RECVFROM:6666,ip-add-membership=224.1.0.1:101.16.0.118,fork EXEC:hostname
client侧运行命令行：
kubectl exec -it pod-node3 -- /usr/bin/socat-1.7.4.4-x86_64 STDIO UDP4-DATAGRAM:224.1.0.1:6666,range=101.16.0.119/24
ip地址和rang需要从ifconfig命令中获取
实机运行效果
验证广播broadcast
server侧运行命令行：
kubectl exec -it pod-node2 -- /usr/bin/socat-1.7.4.4-x86_64 -dd UDP4-RECVFROM:6666,broadcast,fork EXEC:hostname
client侧运行命令行：
kubectl exec -it pod-node3 -- /usr/bin/socat-1.7.4.4-x86_64 -dd STDIO UDP4-DATAGRAM:101.16.255.255:6666,broadcast,range=101.16.0.119/16
ip地址和rang需要从ifconfig命令中获取
实机运行效果
server
client
官方操作文档
IP Multicasting with Socat
