單節點部署k8s 3） flannel網路配置

轉接上文：單節點部署k8s(2)：配置etcd集群

1、安裝docker

yum makecache fast

yum -y install docker-ce

2、網路優化

[root@k8s-node1 /]# echo 'net.ipv4.ip_forward=1' > /etc/sysctl.conf

[root@k8s-node1 /]# sysctl -p

3、啟動服務

[root@k8s-node1 /]# systemctl start docker

[root@k8s-node1 /]# systemctl enable docker

1、在master伺服器中寫入分配的子網段到etcd中

}

2、在所有的node中輸入

[root@k8s-node1 ~]# mkdir /opt/kubernetes/ -p

[root@k8s-node1 ~]# tar xzvf ./flannel-v0.10.0-linux-amd64.tar.gz -c ./
[root@k8s-node1 ~]# mv mk-docker-opts.sh flanneld /opt/kubernetes/bin/
[root@k8s-node1 ~]# vim ./flannel.sh
#!/bin/bash 
etcd_endpoints=$
cat 
flannel_options="--etcd-endpoints=$ \
-etcd-cafile=/opt/etcd/ssl/ca.pem \
-etcd-certfile=/opt/etcd/ssl/server.pem \
-etcd-keyfile=/opt/etcd/ssl/server-key.pem"
eofcat 
[unit]
description=flanneld overlay address etcd agent
after=network-online.target network.target
before=docker.service
[service]
type=notify
environmentfile=/opt/kubernetes/cfg/flanneld
execstart=/opt/kubernetes/bin/flanneld --ip-masq \$flannel_options
execstartpost=/opt/kubernetes/bin/mk-docker-opts.sh -k docker_network_options -d /run/flannel/subnet.env
restart=on-failure
[install]
wantedby=multi-user.target
eofsystemctl daemon-reload
systemctl enable flanneld
systemctl restart flanneld
[root@k8s-node1 ~]# bash flannel.sh 

3、修改docker的配置檔案

[root@k8s-node1 ~]# vim /usr/lib/systemd/system/docker.service

environmentfile=/run/flannel/subnet.env（新增此行）
execstart=/usr/bin/dockerd $docker_network_options -h fd:// --containerd=/run/containerd/containerd.sock
[root@k8s-node1 ~]# systemctl daemon-reload
[root@k8s-node1 ~]# systemctl restart docker

4、檢視bip指定啟動時的子網

[root@k8s-node1 ~]#  cat /run/flannel/subnet.env

5、檢視flannel網路

[root@k8s-node1 ~]# ifconfig

6、測試ping通對方docker0網絡卡 證明flannel起到路由作用

[root@k8s-node1 ~]# docker run -it centos:7 /bin/bash

[root@c65500514a3d /]# yum install net-tools -y
[root@c65500514a3d /]# ifconfig 
eth0: flags=4163mtu 1500
inet 172.85.0.2 netmask 255.255.255.0 broadcast 172.85.255.255
ether 02:42:ac:12:00:02 txqueuelen 0 (ethernet)
rx packets 2190 bytes 15064770 (14.3 mib)
rx errors 0 dropped 0 overruns 0 frame 0
tx packets 2038 bytes 148065 (144.5 kib)
tx errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@k8s-node2 ~]# ifconfig
5: docker0: mtu 1500 qdisc noqueue state down 
link/ether 02:42:1c:08:18:c5 brd ff:ff:ff:ff:ff:ff
inet 172.17.85.1/24 brd 172.17.85.255 scope global docker0
valid_lft forever preferred_lft forever
[root@c65500514a3d /]# ping 172.17.42.2
ping 172.17.42.2 (172.17.42.2) 56(84) bytes of data.
64 bytes from 172.17.42.2: icmp_seq=1 ttl=64 time=0.033 ms
64 bytes from 172.17.42.2: icmp_seq=2 ttl=64 time=0.051 ms
64 bytes from 172.17.42.2: icmp_seq=3 ttl=64 time=0.089 ms
64 bytes from 172.17.42.2: icmp_seq=4 ttl=64 time=0.082 ms

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