1、为Flannel生成证书
[root@linux-node1 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@linux-node1 ssl]# cfssl gencert -ca=/opt/kubernetes/ssl/ca.pem \
> -ca-key=/opt/kubernetes/ssl/ca-key.pem \
> -config=/opt/kubernetes/ssl/ca-config.json \
> -profile=kubernetes flanneld-csr.json | cfssljson -bare flanneld
3、分发证书
[root@linux-node1 ssl]# cp flanneld*.pem /opt/kubernetes/ssl/
[root@linux-node1 ssl]# scp flanneld*.pem 192.168.43.22:/opt/kubernetes/ssl/
[root@linux-node1 ssl]# scp flanneld*.pem 192.168.43.23:/opt/kubernetes/ssl/
4、下载Flannel软件包
[root@linux-node1 src]# wget https://github.com/coreos/flannel/releases/download/v0.10.0/flannel-v0.10.0-linux-amd64.tar.gz
[root@linux-node1 src]# tar -zxvf flannel-v0.10.0-linux-amd64.tar.gz
[root@linux-node1 src]# cp flanneld mk-docker-opts.sh /opt/kubernetes/bin/
[root@linux-node1 src]# scp flanneld mk-docker-opts.sh 192.168.43.22:/opt/kubernetes/bin/
[root@linux-node1 src]# scp flanneld mk-docker-opts.sh 192.168.43.23:/opt/kubernetes/bin/
[root@linux-node1 src]# cd /usr/local/src/kubernetes/cluster/centos/node/bin/
[root@linux-node1 bin]# cp remove-docker0.sh /opt/kubernetes/bin/
[root@linux-node1 bin]# scp remove-docker0.sh 192.168.43.22:/opt/kubernetes/bin/
[root@linux-node1 bin]# scp remove-docker0.sh 192.168.43.23:/opt/kubernetes/bin/
5、配置Flannel
[root@linux-node1 ~]# vim /opt/kubernetes/cfg/flannel
FLANNEL_ETCD="-etcd-endpoints=https://192.168.43.21:2379,https://192.168.43.22:2379,https://192.168.43.23:2379"
FLANNEL_ETCD_KEY="-etcd-prefix=/kubernetes/network"
FLANNEL_ETCD_CAFILE="--etcd-cafile=/opt/kubernetes/ssl/ca.pem"
FLANNEL_ETCD_CERTFILE="--etcd-certfile=/opt/kubernetes/ssl/flanneld.pem"
FLANNEL_ETCD_KEYFILE="--etcd-keyfile=/opt/kubernetes/ssl/flanneld-key.pem"
[root@linux-node1 ~]# scp /opt/kubernetes/cfg/flannel 192.168.43.22:/opt/kubernetes/cfg/
[root@linux-node1 ~]# scp /opt/kubernetes/cfg/flannel 192.168.43.23:/opt/kubernetes/cfg/
6、设置Flannel系统服务
[root@linux-node1 ~]# vim /usr/lib/systemd/system/flannel.service
[Unit]
Description=Flanneld overlay address etcd agent
After=network.target
Before=docker.service
[Service]
EnvironmentFile=-/opt/kubernetes/cfg/flannel
ExecStartPre=/opt/kubernetes/bin/remove-docker0.sh
ExecStart=/opt/kubernetes/bin/flanneld ${FLANNEL_ETCD} ${FLANNEL_ETCD_KEY} ${FLANNEL_ETCD_CAFILE} ${FLANNEL_ETCD_CERTFILE} ${FLANNEL_ETCD_KEYFILE}
ExecStartPost=/opt/kubernetes/bin/mk-docker-opts.sh -d /run/flannel/docker
Type=notify
[Install]
WantedBy=multi-user.target
RequiredBy=docker.service
[root@linux-node1 ~]# scp /usr/lib/systemd/system/flannel.service 192.168.43.22:/usr/lib/systemd/system/
[root@linux-node1 ~]# scp /usr/lib/systemd/system/flannel.service 192.168.43.23:/usr/lib/systemd/system/
7、Flannel CNI集成
下载CNI插件
[root@linux-node1 ~]# wget https://github.com/containernetworking/plugins/releases/download/v0.7.1/cni-plugins-amd64-v0.7.1.tgz
[root@linux-node1 src]# mkdir /opt/kubernetes/bin/cni
[root@linux-node2 src]# mkdir /opt/kubernetes/bin/cni
[root@linux-node3 src]# mkdir /opt/kubernetes/bin/cni
[root@linux-node1 src]# tar zxf cni-plugins-amd64-v0.7.1.tgz -C /opt/kubernetes/bin/cni
[root@linux-node1 src]# scp -r /opt/kubernetes/bin/cni/* 192.168.43.22:/opt/kubernetes/bin/cni/
[root@linux-node1 src]# scp -r /opt/kubernetes/bin/cni/* 192.168.43.23:/opt/kubernetes/bin/cni/
8、创建etcd的key
[root@linux-node1 src]# /opt/kubernetes/bin/etcdctl --ca-file /opt/kubernetes/ssl/ca.pem --cert-file /opt/kubernetes/ssl/flanneld.pem --key-file /opt/kubernetes/ssl/flanneld-key.pem \
> --no-sync -C https://192.168.43.21:2379,https://192.168.43.22:2379,https://192.168.43.23:2379 \
> mk /kubernetes/network/config '{ "Network": "10.2.0.0/16", "Backend": { "Type": "vxlan", "VNI": 1 }}' >/dev/null 2>&1
9、启动flannel(三个节点都执行)
# systemctl daemon-reload
# systemctl enable flannel
# chmod +x /opt/kubernetes/bin/*
# systemctl start flannel
10、配置Docker使用Flannel
[root@linux-node1 src]# 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
[root@linux-node1 src]# scp /usr/lib/systemd/system/docker.service 192.168.43.22:/usr/lib/systemd/system/
[root@linux-node1 src]# scp /usr/lib/systemd/system/docker.service 192.168.43.23:/usr/lib/systemd/system/
11、重启docker三台节点执行同一操作
# systemctl daemon-reload
# systemctl restart docker