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Kubernetes1.91(K8s)安装部署过程(五)--安装flannel网络插件

2018-01-05 11:06 1746 查看
node节点需要安装flannel网络插件才能保证所有的pod在一个局域网内通信,直接使用yum安装即可,版本是0.7.1.

1、安装flannel插件:

注意是2个node节点都需要安装,都需要修改service文件和配置文件。

yuminstallflannel-y


2、修改service文件/usr/lib/systemd/system/flanneld.service其内容为:

[Unit]
Description=Flanneldoverlayaddressetcdagent
After=network.target
After=network-online.target
Wants=network-online.target
After=etcd.service
Before=docker.service

[Service]
Type=notify
EnvironmentFile=/etc/sysconfig/flanneld
EnvironmentFile=-/etc/sysconfig/docker-network
ExecStart=/usr/bin/flanneld-start\
-etcd-endpoints=${FLANNEL_ETCD_ENDPOINTS}\
-etcd-prefix=${FLANNEL_ETCD_PREFIX}\
$FLANNEL_OPTIONS
ExecStartPost=/usr/libexec/flannel/mk-docker-opts.sh-kDOCKER_NETWORK_OPTIONS-d/run/flannel/docker
Restart=on-failure

[Install]
WantedBy=multi-user.target
RequiredBy=docker.service


提示:service文件中所有的变量参数都是读取相应的配置文件里面的,所有要保证前后对应。

修改其配置文件/etc/sysconfig/flanneld内容如下:

#Flanneldconfigurationoptions

#etcdurllocation.Pointthistotheserverwhereetcdruns
FLANNEL_ETCD_ENDPOINTS="https://10.10.90.105:2379,https://10.10.90.106:2379,https://10.10.90.107:2379"

#etcdconfigkey.Thisistheconfigurationkeythatflannelqueries
#Foraddressrangeassignment
#FLANNEL_ETCD_PREFIX="/atomic.io/network"
FLANNEL_ETCD_PREFIX="/kube-centos/network"

#Anyadditionaloptionsthatyouwanttopass
#FLANNEL_OPTIONS=""
FLANNEL_OPTIONS="-etcd-cafile=/etc/kubernetes/ssl/ca.pem-etcd-certfile=/etc/kubernetes/ssl/kubernetes.pem-etcd-keyfile=/etc/kubernetes/ssl/kubernetes-key.pem"


以上2步是2个node节点都需要做的。

3、在etcd中常见网络配置信息

etcdctl--endpoints=https://10.10.90.105:2379,https://10.10.90.106:2379,https://10.10.90.107:2379\
--ca-file=/etc/kubernetes/ssl/ca.pem\
--cert-file=/etc/kubernetes/ssl/kubernetes.pem\
--key-file=/etc/kubernetes/ssl/kubernetes-key.pem\
mkdir/kube-centos/network

#上下是2条命令,在任何节点上创建都行,因为etcd是集群的。
etcdctl--endpoints=https://10.10.90.105:2379,https://10.10.90.106:2379,https://10.10.90.107:2379\
--ca-file=/etc/kubernetes/ssl/ca.pem\
--cert-file=/etc/kubernetes/ssl/kubernetes.pem\
--key-file=/etc/kubernetes/ssl/kubernetes-key.pem\
mk/kube-centos/network/config'{"Network":"172.30.0.0/16","SubnetLen":24,"Backend":{"Type":"host-gw"}}'


4、启动flannel服务

systemctldaemon-reload
systemctlenableflanneld
systemctlstartflanneld
systemctlstatusflanneld


5、核对相关配置信息:

#先声明个endpoint变量,后边好调用
[root@c7test_node1~]#ETCD_ENDPOINTS='https://10.10.90.105:2379,https://10.10.90.106:2379,https://10.10.90.107:2379'

[root@c7test_node1~]#etcdctl--endpoints=${ETCD_ENDPOINTS}\
--ca-file=/etc/kubernetes/ssl/ca.pem\
--cert-file=/etc/kubernetes/ssl/kubernetes.pem\
--key-file=/etc/kubernetes/ssl/kubernetes-key.pem\
ls/kube-centos/network/subnets
#输出
/kube-centos/network/subnets/172.30.87.0-24
/kube-centos/network/subnets/172.30.92.0-24
#说明,有几个node就有几个子网络,就有几条记录,我是2个node,分别安装了flannel插件

[root@c7test_node1~]#etcdctl--endpoints=${ETCD_ENDPOINTS}\
--ca-file=/etc/kubernetes/ssl/ca.pem\
--cert-file=/etc/kubernetes/ssl/kubernetes.pem\
--key-file=/etc/kubernetes/ssl/kubernetes-key.pem\
get/kube-centos/network/config

#输出
{"Network":"172.30.0.0/16","SubnetLen":24,"Backend":{"Type":"host-gw"}}

#此处是查看主网络配置

etcdctl--endpoints=${ETCD_ENDPOINTS}--ca-file=/etc/kubernetes/ssl/ca.pem--cert-file=/etc/kubernetes/ssl/kubernetes.pem--key-file=/etc/kubernetes/ssl/kubernetes-key.pemget/kube-centos/network/subnets/172.30.92.0-24

#输出

{"PublicIP":"10.10.90.106","BackendType":"vxlan","BackendData":{"VtepMAC":"26:af:ac:26:47:ad"}}

etcdctl--endpoints=${ETCD_ENDPOINTS}--ca-file=/etc/kubernetes/ssl/ca.pem--cert-file=/etc/kubernetes/ssl/kubernetes.pem--key-file=/etc/kubernetes/ssl/kubernetes-key.pemget/kube-centos/network/subnets/172.30.87.0-24

#输出

{"PublicIP":"10.10.90.107","BackendType":"vxlan","BackendData":{"VtepMAC":"82:6f:58:94:9f:59"}}



如有以上输出即代表flannel插件安装配置成功,下一篇文章开始安装node节点。
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