Kubernetes实战(十)——Flannel部署

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Kubernetes实战(十)——Flannel部署

                                                                  

1.Flannel部署

Kubernetes实战(十)——Flannel部署

1.为Flannel生成证书

[root@linux-node1 ssl]# cat > flanneld-csr.json <<EOF
{
  "CN": "flanneld",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "BeiJing",
      "L": "BeiJing",
      "O": "k8s",
      "OU": "System"
    }
  ]
}
EOF

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 192.168.56.12:/opt/kubernetes/ssl/
[root@linux-node1 ssl]# scp flanneld*.pem 192.168.56.13:/opt/kubernetes/ssl/

4.下载Flannel软件包

[root@linux-node1 ~]# cd /usr/local/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 zxf flannel-v0.10.0-linux-amd64.tar.gz
[root@linux-node1 src]# cp flanneld mk-docker-opts.sh /opt/kubernetes/bin/
复制到linux-node2节点
[root@linux-node1 src]# scp flanneld mk-docker-opts.sh 192.168.56.12:/opt/kubernetes/bin/
[root@linux-node1 src]# scp flanneld mk-docker-opts.sh 192.168.56.13:/opt/kubernetes/bin/
复制对应脚本到/opt/kubernetes/bin目录下。
[root@linux-node1 ~]# 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 192.168.56.12:/opt/kubernetes/bin/
[root@linux-node1 bin]# scp remove-docker0.sh 192.168.56.13:/opt/kubernetes/bin/

5.配置Flannel

[root@linux-node1 ~]# cat > /opt/kubernetes/cfg/flannel <<EOF
FLANNEL_ETCD="-etcd-endpoints=https://192.168.56.11:2379,https://192.168.56.12:2379,https://192.168.56.13:2379"
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"
EOF

复制配置到其它节点上
[root@linux-node1 ~]# scp /opt/kubernetes/cfg/flannel 192.168.56.12:/opt/kubernetes/cfg/
[root@linux-node1 ~]# scp /opt/kubernetes/cfg/flannel 192.168.56.13:/opt/kubernetes/cfg/

6.设置Flannel系统服务

[root@linux-node1 ~]# cat > /usr/lib/systemd/system/flannel.service <<EOF
[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
EOF

配置文件若不生效则直接加参数启动:
ExecStart=/opt/kubernetes/bin/flanneld  \
"-etcd-endpoints=https://192.168.56.11:2379,https://192.168.56.12:2379,https://192.168.56.13:2379" \
"-etcd-prefix=/kubernetes/network" \
"--etcd-cafile=/opt/kubernetes/ssl/ca.pem" \
"--etcd-certfile=/opt/kubernetes/ssl/flanneld.pem" \
"--etcd-keyfile=/opt/kubernetes/ssl/flanneld-key.pem"
  

复制系统服务脚本到其它节点上
# scp /usr/lib/systemd/system/flannel.service 192.168.56.12:/usr/lib/systemd/system/
# scp /usr/lib/systemd/system/flannel.service 192.168.56.13:/usr/lib/systemd/system/

2.Flannel CNI集成

1.下载CNI插件:https://github.com/containernetworking/plugins/releases

wget https://github.com/containernetworking/plugins/releases/download/v0.7.1/cni-plugins-amd64-v0.7.1.tgz
[root@linux-node1 ~]# mkdir /opt/kubernetes/bin/cni #三个节点都创建
[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/* 192.168.56.12:/opt/kubernetes/bin/cni/
[root@linux-node1 src]# scp -r /opt/kubernetes/bin/cni/* 192.168.56.13:/opt/kubernetes/bin/cni/

2.创建Etcd的key

/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://192.168.56.11:2379,https://192.168.56.12:2379,https://192.168.56.13:2379 \
mk /kubernetes/network/config '{ "Network": "10.2.0.0/16", "Backend": { "Type": "vxlan", "VNI": 1 }}' >/dev/null 2>&1

3.启动flannel

[root@linux-node1 ~]# systemctl daemon-reload && systemctl enable flannel && chmod +x /opt/kubernetes/bin/* && systemctl start flannel

4.查看服务状态

[root@linux-node1 ~]# systemctl status flannel

3.配置Docker使用Flannel

[root@linux-node1 ~]# 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 #让docker服务依赖flannel

[Service] #增加EnvironmentFile=-/run/flannel/docker
Type=notify
EnvironmentFile=-/run/flannel/docker
ExecStart=/usr/bin/dockerd $DOCKER_OPTS

将配置复制到另外两个节点

# scp /usr/lib/systemd/system/docker.service 192.168.56.12:/usr/lib/systemd/system/
# scp /usr/lib/systemd/system/docker.service 192.168.56.13:/usr/lib/systemd/system/

重启Docker

[root@linux-node1 ~]# systemctl daemon-reload && systemctl restart docker

#每一台机器的docker网偳都会不一样
[root@linux-node1 ssl]# ifconfig |egrep -A 1 "docker0|flannel" 
docker0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 10.2.83.1  netmask 255.255.255.0  broadcast 10.2.83.255
--
flannel.1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1450
        inet 10.2.83.0  netmask 255.255.255.255  broadcast 0.0.0.0

[root@linux-node1 ssl]# cat /run/flannel/docker 
DOCKER_OPT_BIP="--bip=10.2.83.1/24"
DOCKER_OPT_IPMASQ="--ip-masq=true"
DOCKER_OPT_MTU="--mtu=1450"
DOCKER_OPTS=" --bip=10.2.83.1/24 --ip-masq=true --mtu=1450"

[root@linux-node2 kubernetes]# cat /run/flannel/docker 
DOCKER_OPT_BIP="--bip=10.2.91.1/24"
DOCKER_OPT_IPMASQ="--ip-masq=true"
DOCKER_OPT_MTU="--mtu=1450"
DOCKER_OPTS=" --bip=10.2.91.1/24 --ip-masq=true --mtu=1450"
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