Centos7 下Kubernetes配置flannel网络

操作环境

网络拓扑图



本次操作环境参照《 Centos7 下Kubernetes集群安装部署》，在《Centos7
下Kubernetes集群安装部署》环境中k8s-

master没有安装flannel，此次配置需要在k8s-master中安装flannel。

操作步骤

配置k8s-master

1.在k8s-master节点上创建flannel网络

[root@k8s-master yaml]# etcdctl mk /atomic.io/network/config '{"Network": "172.17.0.0/16"}'

2.配置flannel

[root@k8s-master yaml]# vi /etc/sysconfig/flanneld
# Flanneld configuration options

# etcd url location.  Point this to the server where etcd runs
FLANNEL_ETCD_ENDPOINTS="http://10.10.200.224:2379"

# etcd config key.  This is the configuration key that flannel queries
# For address range assignment
FLANNEL_ETCD_PREFIX="/atomic.io/network"
#FLANNEL_ETCD_PREFIX="/k8s/network"
# Any additional options that you want to pass
#FLANNEL_OPTIONS="ens192"

[root@k8s-master yaml]# vi /usr/lib/systemd/system/flanneld.service
[Unit]
Description=Flanneld overlay address etcd agent
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  $FLANNEL_OPTIONS
ExecStart=/usr/bin/flanneld -etcd-endpoints=http://10.10.200.224:2379
ExecStartPost=/usr/libexec/flannel/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/docker
Restart=on-failure

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

3.启动flannel

[root@k8s-master ~]# systemctl start flanneld.service

  在启动flannel，通过ifconfig可以查看到flannel0

[root@k8s-master ~]# ifconfig
ens192: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
inet 10.10.200.224  netmask 255.255.255.0  broadcast 10.10.200.255
inet6 fe80::ec55:e4e8:4be:93bb  prefixlen 64  scopeid 0x20<link>
ether 00:0c:29:18:3f:c3  txqueuelen 1000  (Ethernet)
RX packets 147042  bytes 44436790 (42.3 MiB)
RX errors 0  dropped 30  overruns 0  frame 0
TX packets 148062  bytes 33065150 (31.5 MiB)
TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

flannel0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST>  mtu 1472
inet 172.17.30.0  netmask 255.255.0.0  destination 172.17.30.0
inet6 fe80::3908:159:b907:1624  prefixlen 64  scopeid 0x20<link>
unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 500  (UNSPEC)
RX packets 1321  bytes 1737235 (1.6 MiB)
RX errors 0  dropped 0  overruns 0  frame 0
TX packets 630  bytes 58891 (57.5 KiB)
TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
inet 127.0.0.1  netmask 255.0.0.0
inet6 ::1  prefixlen 128  scopeid 0x10<host>
loop  txqueuelen 1  (Local Loopback)
RX packets 64441  bytes 28164690 (26.8 MiB)
RX errors 0  dropped 0  overruns 0  frame 0
TX packets 64441  bytes 28164690 (26.8 MiB)
TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

配置k8s-node

1.2个节点flannel的方法相同，配置flannel

[root@k8s-node1 ~]# vi /etc/sysconfig/flanneld
# Flanneld configuration options

# etcd url location.  Point this to the server where etcd runs
FLANNEL_ETCD_ENDPOINTS="http://10.10.200.224:2379"

# etcd config key.  This is the configuration key that flannel queries
# For address range assignment
FLANNEL_ETCD_PREFIX="/atomic.io/network"
#FLANNEL_ETCD_PREFIX="/k8s/network"
# Any additional options that you want to pass
#FLANNEL_OPTIONS="ens192"

[root@k8s-master yaml]# vi /usr/lib/systemd/system/flanneld.service
[Unit]
Description=Flanneld overlay address etcd agent
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  $FLANNEL_OPTIONS
ExecStart=/usr/bin/flanneld -etcd-endpoints=http://10.10.200.224:2379
ExecStartPost=/usr/libexec/flannel/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/docker
Restart=on-failure

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

2.启动flannel

[root@k8s-node1 ~]# systemctl start flanneld.service

3.启动flannel后，可以通过ifconfig查看到flannel0

[root@k8s-node1 ~]# ifconfig
docker0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1472
inet 172.17.23.1  netmask 255.255.255.0  broadcast 0.0.0.0
inet6 fe80::42:a5ff:fef4:9795  prefixlen 64  scopeid 0x20<link>
ether 02:42:a5:f4:97:95  txqueuelen 0  (Ethernet)
RX packets 1430  bytes 1851730 (1.7 MiB)
RX errors 0  dropped 0  overruns 0  frame 0
TX packets 1490  bytes 1290056 (1.2 MiB)
TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ens192: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
inet 10.10.200.229  netmask 255.255.255.0  broadcast 10.10.200.255
inet6 fe80::5834:2493:e9ef:3b95  prefixlen 64  scopeid 0x20<link>
ether 00:0c:29:f6:c6:42  txqueuelen 1000  (Ethernet)
RX packets 264090  bytes 41537991 (39.6 MiB)
RX errors 0  dropped 19  overruns 0  frame 0
TX packets 251049  bytes 64982214 (61.9 MiB)
TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

flannel0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST>  mtu 1472
inet 172.17.23.0  netmask 255.255.0.0  destination 172.17.23.0
inet6 fe80::da8b:b01f:3f46:3352  prefixlen 64  scopeid 0x20<link>
unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 500  (UNSPEC)
RX packets 616  bytes 58064 (56.7 KiB)
RX errors 0  dropped 0  overruns 0  frame 0
TX packets 1315  bytes 1736045 (1.6 MiB)
TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
inet 127.0.0.1  netmask 255.0.0.0
inet6 ::1  prefixlen 128  scopeid 0x10<host>
loop  txqueuelen 1  (Local Loopback)
RX packets 438  bytes 23836 (23.2 KiB)
RX errors 0  dropped 0  overruns 0  frame 0
TX packets 438  bytes 23836 (23.2 KiB)
TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

4.设置docker0的ip地址

[root@k8s-node1 ~]# ifconfig docker0 172.17.23.1

5.节点2参照上述配置进行设置即可

通过上述就完成了配置flannel