一、Flannel网络部署

为Flannel生成证书

[root@linux-node1 ssl]# vim flanneld-csr.json

{

  "CN": "flanneld",

  "hosts": [],

  "key": {

    "algo": "rsa",

    "size":

  },

  "names": [

    {

      "C": "CN",

      "ST": "BeiJing",

      "L": "BeiJing",

      "O": "k8s",

      "OU": "System"

    }

  ]

}

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

// :: [INFO] generate received request

// :: [INFO] received CSR

// :: [INFO] generating key: rsa-

// :: [INFO] encoded CSR

// :: [INFO] signed certificate with serial number

// :: [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for

websites. For more information see the Baseline Requirements for the Issuance and Management

of Publicly-Trusted Certificates, v.1.1., from the CA/Browser Forum (https://cabforum.org);

specifically, section 10.2. ("Information Requirements").

[root@linux-node1 ssl]# ll flanneld*

-rw-r--r--  root root   May  : flanneld.csr

-rw-r--r--  root root   May  : flanneld-csr.json

-rw-------  root root  May  : flanneld-key.pem

-rw-r--r--  root root  May  : flanneld.pem

分发证书

[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/

下载Flannel软件包

# wget https://github.com/coreos/flannel/releases/download/v0.10.0/flannel-v0.10.0-linux-amd64.tar.gz

[root@linux-node1 ssl]# cd /usr/local/src/

[root@linux-node1 src]# pwd

/usr/local/src

[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、linux-node3节点上

[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 src]# cd /usr/local/src/kubernetes/cluster/centos/node/bin/

[root@linux-node1 bin]# ll

total

-rwxr-xr-x  root root  Apr  : mk-docker-opts.sh

-rwxr-xr-x  root root   Apr  : remove-docker0.sh

[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/

配置Flannel

[root@linux-node1 bin]# vim /opt/kubernetes/cfg/flannel

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"

复制配置到其它节点上

[root@linux-node1 bin]# scp /opt/kubernetes/cfg/flannel 192.168.56.12:/opt/kubernetes/cfg/

[root@linux-node1 bin]# scp /opt/kubernetes/cfg/flannel 192.168.56.13:/opt/kubernetes/cfg/

设置Flannel系统服务

[root@linux-node1 bin]# vim /usr/lib/systemd/system/flannel.service

[root@linux-node1 bin]# cat /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

复制系统服务脚本到其它节点上

[root@linux-node1 bin]# scp /usr/lib/systemd/system/flannel.service 192.168.56.12:/usr/lib/systemd/system/

[root@linux-node1 bin]# scp /usr/lib/systemd/system/flannel.service 192.168.56.13:/usr/lib/systemd/system/

二、Flannel CNI集成

下载CNI插件

#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 bin]# mkdir /opt/kubernetes/bin/cni
[root@linux-node2 ssl]# mkdir /opt/kubernetes/bin/cni
[root@linux-node3 ssl]# mkdir /opt/kubernetes/bin/cni
[root@linux-node1 bin]# cd /usr/local/src/

[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/

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://192.168.56.11:2379,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 >&

启动flannel

######################linux-node1启动#############################

[root@linux-node1 src]# systemctl daemon-reload

[root@linux-node1 src]# systemctl enable flannel

Created symlink from /etc/systemd/system/multi-user.target.wants/flannel.service to /usr/lib/systemd/system/flannel.service.

Created symlink from /etc/systemd/system/docker.service.requires/flannel.service to /usr/lib/systemd/system/flannel.service.

[root@linux-node1 src]# chmod +x /opt/kubernetes/bin/*

[root@linux-node1 src]# systemctl start flannel

######################linux-node2启动#############################

[root@linux-node2 src]# systemctl daemon-reload

[root@linux-node2 src]# systemctl enable flannel

Created symlink from /etc/systemd/system/multi-user.target.wants/flannel.service to /usr/lib/systemd/system/flannel.service.

Created symlink from /etc/systemd/system/docker.service.requires/flannel.service to /usr/lib/systemd/system/flannel.service.

[root@linux-node2 src]# chmod +x /opt/kubernetes/bin/*

[root@linux-node2 src]# systemctl start flannel

######################linux-node3启动#############################

[root@linux-node3 ssl]# systemctl daemon-reload

[root@linux-node3 ssl]# systemctl enable flannel

Created symlink from /etc/systemd/system/multi-user.target.wants/flannel.service to /usr/lib/systemd/system/flannel.service.

Created symlink from /etc/systemd/system/docker.service.requires/flannel.service to /usr/lib/systemd/system/flannel.service.

[root@linux-node3 ssl]# chmod +x /opt/kubernetes/bin/*

[root@linux-node3 ssl]# systemctl start flannel

查看服务状态

[root@linux-node1 src]# systemctl status flannel
[root@linux-node2 src]# systemctl status flannel
[root@linux-node3 ssl]# systemctl status flannel
[root@linux-node1 src]# ifconfig

eth0: flags=<UP,BROADCAST,RUNNING,MULTICAST>  mtu

        inet 192.168.56.11  netmask 255.255.255.0  broadcast 192.168.56.255

        inet6 fe80::20c:29ff:fea0:10ca  prefixlen   scopeid 0x20<link>

        ether :0c::a0::ca  txqueuelen   (Ethernet)

        RX packets   bytes  (59.9 MiB)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (1.1 GiB)

        TX errors   dropped  overruns   carrier   collisions 

flannel.: flags=<UP,BROADCAST,RUNNING,MULTICAST>  mtu

        inet 10.2.9.0  netmask 255.255.255.255  broadcast 0.0.0.0

        inet6 fe80:::bbff:fee0:41a6  prefixlen   scopeid 0x20<link>

        ether ::bb:e0::a6  txqueuelen   (Ethernet)

        RX packets   bytes  (0.0 B)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (0.0 B)

        TX errors   dropped  overruns   carrier   collisions 

lo: flags=<UP,LOOPBACK,RUNNING>  mtu

        inet 127.0.0.1  netmask 255.0.0.0

        inet6 ::  prefixlen   scopeid 0x10<host>

        loop  txqueuelen   (Local Loopback)

        RX packets   bytes  (56.5 MiB)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (56.5 MiB)

        TX errors   dropped  overruns   carrier   collisions

linux-node1上查看网卡ifconfig

[root@linux-node2 src]# ifconfig

eth0: flags=<UP,BROADCAST,RUNNING,MULTICAST>  mtu

        inet 192.168.56.12  netmask 255.255.255.0  broadcast 192.168.56.255

        inet6 fe80::20c:29ff:fef9:ca25  prefixlen   scopeid 0x20<link>

        ether :0c::f9:ca:  txqueuelen   (Ethernet)

        RX packets   bytes  (354.7 MiB)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (60.8 MiB)

        TX errors   dropped  overruns   carrier   collisions 

flannel.: flags=<UP,BROADCAST,RUNNING,MULTICAST>  mtu

        inet 10.2.13.0  netmask 255.255.255.255  broadcast 0.0.0.0

        inet6 fe80:::7ff:fe2d:9c2f  prefixlen   scopeid 0x20<link>

        ether :::2d:9c:2f  txqueuelen   (Ethernet)

        RX packets   bytes  (0.0 B)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (0.0 B)

        TX errors   dropped  overruns   carrier   collisions 

lo: flags=<UP,LOOPBACK,RUNNING>  mtu

        inet 127.0.0.1  netmask 255.0.0.0

        inet6 ::  prefixlen   scopeid 0x10<host>

        loop  txqueuelen   (Local Loopback)

        RX packets   bytes  (70.8 KiB)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (70.8 KiB)

        TX errors   dropped  overruns   carrier   collisions

linux-node2上查看网卡ifconfig

[root@linux-node3 ssl]# ifconfig

eth0: flags=<UP,BROADCAST,RUNNING,MULTICAST>  mtu

        inet 192.168.56.13  netmask 255.255.255.0  broadcast 192.168.56.255

        inet6 fe80::20c:29ff:feca:800d  prefixlen   scopeid 0x20<link>

        ether :0c::ca::0d  txqueuelen   (Ethernet)

        RX packets   bytes  (343.1 MiB)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (49.3 MiB)

        TX errors   dropped  overruns   carrier   collisions 

flannel.: flags=<UP,BROADCAST,RUNNING,MULTICAST>  mtu

        inet 10.2.17.0  netmask 255.255.255.255  broadcast 0.0.0.0

        inet6 fe80::c86c:3ff:fe2e:d4ca  prefixlen   scopeid 0x20<link>

        ether ca:6c::2e:d4:ca  txqueuelen   (Ethernet)

        RX packets   bytes  (0.0 B)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (0.0 B)

        TX errors   dropped  overruns   carrier   collisions 

lo: flags=<UP,LOOPBACK,RUNNING>  mtu

        inet 127.0.0.1  netmask 255.0.0.0

        inet6 ::  prefixlen   scopeid 0x10<host>

        loop  txqueuelen   (Local Loopback)

        RX packets   bytes  (47.4 KiB)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (47.4 KiB)

        TX errors   dropped  overruns   carrier   collisions

linux-node3上查看网卡ifconfig

[root@linux-node3 ssl]# cat /run/flannel/docker

DOCKER_OPT_BIP="--bip=10.2.17.1/24"

DOCKER_OPT_IPMASQ="--ip-masq=true"

DOCKER_OPT_MTU="--mtu=1450"

DOCKER_OPTS=" --bip=10.2.17.1/24 --ip-masq=true --mtu=1450"

三、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

[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

[root@linux-node1 src]# scp /usr/lib/systemd/system/docker.service 192.168.56.12:/usr/lib/systemd/system/

[root@linux-node1 src]# scp /usr/lib/systemd/system/docker.service 192.168.56.13:/usr/lib/systemd/system/

重启Docker

#####################linux-node1重启Docker服务########################

[root@linux-node1 src]# systemctl daemon-reload

[root@linux-node1 src]# systemctl restart docker

#####################linux-node3重启Docker服务########################

[root@linux-node2 src]# systemctl daemon-reload

[root@linux-node2 src]# systemctl restart docker

#####################linux-node3重启Docker服务########################

[root@linux-node3 ssl]# systemctl daemon-reload

[root@linux-node3 ssl]# systemctl restart docker
[root@linux-node1 src]# ifconfig

docker0: flags=<UP,BROADCAST,MULTICAST>  mtu

        inet 10.2.9.1  netmask 255.255.255.0  broadcast 10.2.9.255

        ether :::d5:e0:d1  txqueuelen   (Ethernet)

        RX packets   bytes  (0.0 B)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (0.0 B)

        TX errors   dropped  overruns   carrier   collisions 

eth0: flags=<UP,BROADCAST,RUNNING,MULTICAST>  mtu

        inet 192.168.56.11  netmask 255.255.255.0  broadcast 192.168.56.255

        inet6 fe80::20c:29ff:fea0:10ca  prefixlen   scopeid 0x20<link>

        ether :0c::a0::ca  txqueuelen   (Ethernet)

        RX packets   bytes  (65.5 MiB)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (1.1 GiB)

        TX errors   dropped  overruns   carrier   collisions 

flannel.: flags=<UP,BROADCAST,RUNNING,MULTICAST>  mtu

        inet 10.2.9.0  netmask 255.255.255.255  broadcast 0.0.0.0

        inet6 fe80:::bbff:fee0:41a6  prefixlen   scopeid 0x20<link>

        ether ::bb:e0::a6  txqueuelen   (Ethernet)

        RX packets   bytes  (0.0 B)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (0.0 B)

        TX errors   dropped  overruns   carrier   collisions 

lo: flags=<UP,LOOPBACK,RUNNING>  mtu

        inet 127.0.0.1  netmask 255.0.0.0

        inet6 ::  prefixlen   scopeid 0x10<host>

        loop  txqueuelen   (Local Loopback)

        RX packets   bytes  (62.3 MiB)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (62.3 MiB)

        TX errors   dropped  overruns   carrier   collisions

linux-node1上查看网卡ifconfig

[root@linux-node2 src]# ifconfig

docker0: flags=<UP,BROADCAST,MULTICAST>  mtu

        inet 10.2.13.1  netmask 255.255.255.0  broadcast 10.2.13.255

        ether ::6a:cf::9f  txqueuelen   (Ethernet)

        RX packets   bytes  (0.0 B)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (0.0 B)

        TX errors   dropped  overruns   carrier   collisions 

eth0: flags=<UP,BROADCAST,RUNNING,MULTICAST>  mtu

        inet 192.168.56.12  netmask 255.255.255.0  broadcast 192.168.56.255

        inet6 fe80::20c:29ff:fef9:ca25  prefixlen   scopeid 0x20<link>

        ether :0c::f9:ca:  txqueuelen   (Ethernet)

        RX packets   bytes  (361.5 MiB)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (67.7 MiB)

        TX errors   dropped  overruns   carrier   collisions 

flannel.: flags=<UP,BROADCAST,RUNNING,MULTICAST>  mtu

        inet 10.2.13.0  netmask 255.255.255.255  broadcast 0.0.0.0

        inet6 fe80:::7ff:fe2d:9c2f  prefixlen   scopeid 0x20<link>

        ether :::2d:9c:2f  txqueuelen   (Ethernet)

        RX packets   bytes  (0.0 B)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (0.0 B)

        TX errors   dropped  overruns   carrier   collisions 

lo: flags=<UP,LOOPBACK,RUNNING>  mtu

        inet 127.0.0.1  netmask 255.0.0.0

        inet6 ::  prefixlen   scopeid 0x10<host>

        loop  txqueuelen   (Local Loopback)

        RX packets   bytes  (86.3 KiB)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (86.3 KiB)

        TX errors   dropped  overruns   carrier   collisions

linux-node2上查看网卡ifconfig

[root@linux-node3 ssl]# ifconfig

docker0: flags=<UP,BROADCAST,MULTICAST>  mtu

        inet 10.2.17.1  netmask 255.255.255.0  broadcast 10.2.17.255

        ether ::e3:::2d  txqueuelen   (Ethernet)

        RX packets   bytes  (0.0 B)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (0.0 B)

        TX errors   dropped  overruns   carrier   collisions 

eth0: flags=<UP,BROADCAST,RUNNING,MULTICAST>  mtu

        inet 192.168.56.13  netmask 255.255.255.0  broadcast 192.168.56.255

        inet6 fe80::20c:29ff:feca:800d  prefixlen   scopeid 0x20<link>

        ether :0c::ca::0d  txqueuelen   (Ethernet)

        RX packets   bytes  (348.1 MiB)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (54.4 MiB)

        TX errors   dropped  overruns   carrier   collisions 

flannel.: flags=<UP,BROADCAST,RUNNING,MULTICAST>  mtu

        inet 10.2.17.0  netmask 255.255.255.255  broadcast 0.0.0.0

        inet6 fe80::c86c:3ff:fe2e:d4ca  prefixlen   scopeid 0x20<link>

        ether ca:6c::2e:d4:ca  txqueuelen   (Ethernet)

        RX packets   bytes  (0.0 B)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (0.0 B)

        TX errors   dropped  overruns   carrier   collisions 

lo: flags=<UP,LOOPBACK,RUNNING>  mtu

        inet 127.0.0.1  netmask 255.0.0.0

        inet6 ::  prefixlen   scopeid 0x10<host>

        loop  txqueuelen   (Local Loopback)

        RX packets   bytes  (51.3 KiB)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (51.3 KiB)

        TX errors   dropped  overruns   carrier   collisions

linux-node3上查看网卡ifconfig

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