如何通过CentOS Overlay实现高效网络配置优化？

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: 基于 VXLAN 隧道封装技术确保数据在跨主机传输过程中的完整性与加密安全。
• : 支持千级容器规模部署满足公司级集群需求轻松应对业务爆发。
• : 能够穿透不同物理环境和云网站提供统一虚拟交换抽象层大幅降低迁移成本。

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如果还没有 Docker 基础环境请先完成安装否则后续命令将无法执行；建议先检查程序内核版本是否≥​​​​​​​。

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p> bash sudo yum install-y yum-utils device-mapper-persistent-data lvm sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo sudo yum install-y docker-ce docker-ce-cli sudo systemctl start docker &&&sudu systemctl enable docker p 若提示 GPG Key 不匹配请自行导入官方公钥后再尝试安装以免卡住半天。

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p> bash sudo cat p 写入后记得 reload 生效：sudo systemctl daemon-reload && sudo systemctl restart docker  

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p> bash sudo docker network create --driver overlay --subnet=10.xx.xx.xxx/xx my-overlay-network   

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p> bash # 主机A 上启动并进入交互 bash sudo docker run-d --name cA --network my-overlay-network nginx bash sudo exec-it cA sh  # 在容器内执行 ping 测试 bash ping cB # 若提示 name unknown 检查 DNS 或添加 /etc/hosts 指向对方 IP即可成功回复.

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h6     h6 sysctl-w net.core.somaxconn=4096    h6 sysctl-w net.ipv4.ip_forward=1    h6 setenforce permissive 或修改 /etc/selinux/config 永久生效>

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• - 参考 RedHat/CentOS official docs 配合 nftables 时记得也要添加相应 chain rule

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 h5
h5 假设两台物理服务器分别为 MasterNode 和 WorkerNode 每台均已按上述步骤完成 docker + overlay 配置。不过，h5 在 MasterNode 上执行：
bash
docker run-d \ name cA \ image nginx \ network my-overlay-network
ifconfig cA | grep inet
shows ip like 10.xx.xx.xxx.
h5 在 WorkerNode 上同等操作：
bash
docker run-d \ name cB \ image nginx \ my-overlay-network
ifconfig cB | grep inet shows different subnet address yet仍可成功ping通。docker exec-it cA ping cB
if receives reply packets说明跨主机通信完全就绪。endcase-study">
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