Kubernetes部署(八):Flannel网络部署
相关内容:
Kubernetes部署(一):架构及功能说明
Kubernetes部署(二):系统环境初始化
Kubernetes部署(三):CA证书制作
Kubernetes部署(四):ETCD集群部署
Kubernetes部署(五):Haproxy、Keppalived部署
Kubernetes部署(六):Master节点部署
Kubernetes部署(七):Node节点部署
Kubernetes部署(八):Flannel网络部署
Kubernetes部署(九):CoreDNS、Dashboard、Ingress部署
Kubernetes部署(十):储存之glusterfs和heketi部署
Kubernetes部署(十一):管理之Helm和Rancher部署
Kubernetes部署(十二):helm部署harbor企业级镜像仓库
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Flannel 需要在所有的master和node都部署
1.为Flannel生成证书
[root@node-01 ssl]# vim flanneld-csr.json
{
"CN": "flanneld",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "BeiJing",
"L": "BeiJing",
"O": "k8s",
"OU": "System"
}
]
}
2.生成证书
[root@node-01 ssl]# cfssl gencert -ca=/data/kubernetes/ssl/ca.pem \
-ca-key=/data/kubernetes/ssl/ca-key.pem \
-config=/data/kubernetes/ssl/ca-config.json \
-profile=kubernetes flanneld-csr.json | cfssljson -bare flanneld
3.分发证书
[root@node-01 ssl]# for n in `seq 201 206`; do scp flanneld*.pem 10.31.90.$n:/data/kubernetes/ssl/;done
4.下载Flannel软件包
[root@node-01 k8s]#wget https://github.com/coreos/flannel/releases/download/v0.10.0/flannel-v0.10.0-linux-amd64.tar.gz
[root@node-01 k8s]# tar zxf flannel-v0.10.0-linux-amd64.tar.gz
[root@node-01 k8s]# for n in `seq 201 206`;do scp flanneld mk-docker-opts.sh 10.31.90.$n:/data/kubernetes/bin/;done
复制对应脚本到/data/kubernetes/bin目录下。
[root@node-01 k8s]# for n in `seq 201 206`;do scp remove-docker0.sh 10.31.90.$n:/data/kubernetes/bin/;done
5.配置Flannel
[root@node-04 ssl]# vim /data/kubernetes/cfg/flannel
FLANNEL_ETCD="-etcd-endpoints=https://10.31.90.201:2379,https://10.31.90.202:2379,https://10.31.90.203:2379"
FLANNEL_ETCD_KEY="-etcd-prefix=/kubernetes/network"
FLANNEL_ETCD_CAFILE="--etcd-cafile=/data/kubernetes/ssl/ca.pem"
FLANNEL_ETCD_CERTFILE="--etcd-certfile=/data/kubernetes/ssl/flanneld.pem"
FLANNEL_ETCD_KEYFILE="--etcd-keyfile=/data/kubernetes/ssl/flanneld-key.pem"
复制配置到其它节点上
[root@node-01 ~]# for n in `seq 201 206`;do scp /data/kubernetes/cfg/flannel 10.31.90.$n:/data/kubernetes/cfg/;done
6.设置Flannel系统服务
[root@node-01 ~]# vim /usr/lib/systemd/system/flannel.service
[Unit]
Description=Flanneld overlay address etcd agent
After=network.target
Before=docker.service
[Service]
EnvironmentFile=-/data/kubernetes/cfg/flannel
ExecStartPre=/data/kubernetes/bin/remove-docker0.sh
ExecStart=/data/kubernetes/bin/flanneld ${FLANNEL_ETCD} ${FLANNEL_ETCD_KEY} ${FLANNEL_ETCD_CAFILE} ${FLANNEL_ETCD_CERTFILE} ${FLANNEL_ETCD_KEYFILE}
ExecStartPost=/data/kubernetes/bin/mk-docker-opts.sh -d /run/flannel/docker
Type=notify
[Install]
WantedBy=multi-user.target
RequiredBy=docker.service
复制系统服务脚本到其它节点上
[root@node-01 k8s]# for n in `seq 201 206`;do scp /usr/lib/systemd/system/flannel.service 10.31.90.$n:/usr/lib/systemd/system/flannel.service;done
Flannel CNI集成
下载CNI插件
[root@node-01 ~]# wget https://github.com/containernetworking/plugins/releases/download/v0.7.1/cni-plugins-amd64-v0.7.1.tgz
[root@node-01 ~]# mkdir /data/kubernetes/bin/cni
[root@node-01 src]# tar zxf cni-plugins-amd64-v0.7.1.tgz -C /data/kubernetes/bin/cni
[root@node-01 k8s]# for n in `seq 201 206`;do scp /data/kubernetes/bin/cni/* 10.31.90.$n:/data/kubernetes/bin/cni/;done
创建Etcd的key
[root@node-01 ~]# /data/kubernetes/bin/etcdctl --ca-file /data/kubernetes/ssl/ca.pem --cert-file /data/kubernetes/ssl/flanneld.pem --key-file /data/kubernetes/ssl/flanneld-key.pem \
--no-sync -C https://10.31.90.201:2379,https://10.31.90.202:2379,https://10.31.90.203:2379 \
mk /kubernetes/network/config '{ "Network": "10.2.0.0/16", "Backend": { "Type": "vxlan", "VNI": 1 }}' >/dev/null 2>&1
启动flannel
[root@node-01 ~]# systemctl daemon-reload
[root@node-01 ~]# systemctl enable flannel
[root@node-01 ~]# chmod +x /data/kubernetes/bin/*
[root@node-01 ~]# systemctl start flannel
查看服务状态
[root@node-01 ~]# systemctl status flannel
配置Docker使用Flannel
[root@node-01 ~]# vim /usr/lib/systemd/system/docker.service
[Unit] #在Unit下面修改After和增加Requires
After=network-online.target firewalld.service flannel.service
Wants=network-online.target
Requires=flannel.service
[Service] #增加EnvironmentFile=-/run/flannel/docker
Type=notify
EnvironmentFile=-/run/flannel/docker
ExecStart=/usr/bin/dockerd $DOCKER_OPTS
将配置复制到其它所有的node
[root@node-01 k8s]# for n in `seq 201 206`;do scp /usr/lib/systemd/system/docker.service 10.31.90.$n:/usr/lib/systemd/system/docker.service;done
重启Docker
[root@node-01 ~]# systemctl daemon-reload
[root@node-01 ~]# systemctl restart docker
再查看各个节点会发现docker0网卡和flannel网卡的ip地址都是我们上面配置的网段了。
[root@node-01 k8s]# ifconfig
docker0: flags=4099 mtu 1500
inet 10.2.84.1 netmask 255.255.255.0 broadcast 10.2.84.255
ether 02:42:5e:c6:0c:aa txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
flannel.1: flags=4163 mtu 1450
inet 10.2.84.0 netmask 255.255.255.255 broadcast 0.0.0.0
inet6 fe80::8ccc:15ff:fedd:c00d prefixlen 64 scopeid 0x20
ether 8e:cc:15:dd:c0:0d txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 8 overruns 0 carrier 0 collisions 0
至此k8s的集群就已经全部部署完成,后续会继续补充管理、监控、存储等方面的文档。
后续会陆续更新所有的安装文档,如果你觉得我写的不错,希望大家多多关注点赞,非常感谢!
文章标题:Kubernetes部署(八):Flannel网络部署
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