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  • 059、安装配置flannel（2019-03-28 周四）

     
    build flannel
     
    flannel 没哟现成的执行文件可用，必须自己build，最可靠的方法是在 Docker 容器中build。不过用于做build的docker镜像托管在 gcr.io ，国内可能无法直接访问，为了方便实验，老师已经将他mirror 到了docker hub中，构建步骤如下
     
    #    1、下载并重命名image
     
    docker pull cloudman6/kube-cross:v1.6.2-2
    docker tag cloudman6/kube-cross:v1.6.2-2 gcr.io/google_containers/kube-cross:v1.6.2-2
     
    #    2、下载flannel源码
     
    git clone https://github.com/coreos/flannel.git
     
    #    3、开始构建
     
    apt-get  install zip
    apt-get  install make
    apt-get  install make-guile
    cd flannel
    make dist/flanneld-amd64
     
    #    4、将flanneld执行文件拷贝到 host1 和 host2 上
     
    scp dist/flanneld-amd64 10.12.31.211:/usr/local/bin/flanneld
    scp dist/flanneld-amd64 10.12.31.212:/usr/local/bin/flanneld
     
    #    5、将flannel网络的配置信息保存到etcd中
     
    [root@docker-machine ~]# cat flannel-config.json
    {
      "Network": "10.2.0.0/16",    #    定义该flannel网络的IP池
      "SubnetLen": 24,             #    指定每个host分配到的subnet大小为24位，即 10.2.x.0/24
      "Backend": {
        "Type": "vxlan"            #    backend为vxlan
      }
    }
     
    #    /docker-test/network/config 是etcd数据项的key，flannel-config.json的内容是etcd数据项的 value
     
    [root@docker-machine ~]# etcdctl --endpoints=10.12.31.213:2379 set /docker-test/network/config < flannel-config.json
    {
      "Network": "10.2.0.0/16",
      "SubnetLen": 24,
      "Backend": {
        "Type": "vxlan"
      }
    }
    [root@docker-machine ~]# etcdctl --endpoints=10.12.31.213:2379 get /docker-test/network/config
    {
      "Network": "10.2.0.0/16",
      "SubnetLen": 24,
      "Backend": {
        "Type": "vxlan"
      }
    }
     
    #    6、在host上启动flannel
     
    root@host1:~# flanneld-amd64 -etcd-endpoints=http://10.12.31.213:2379 -iface=ens160 -etcd-prefix=/docker-test/network &
    I0329 23:15:03.568863    4615 main.go:529] Using interface with name ens160 and address 10.12.31.211
    I0329 23:15:03.568916    4615 main.go:546] Defaulting external address to interface address (10.12.31.211)
    I0329 23:15:03.569029    4615 main.go:244] Created subnet manager: Etcd Local Manager with Previous Subnet: 10.2.46.0/24
    I0329 23:15:03.569051    4615 main.go:247] Installing signal handlers
    I0329 23:15:03.570648    4615 main.go:388] Found network config - Backend type: vxlan
    I0329 23:15:03.570718    4615 vxlan.go:120] VXLAN config: VNI=1 Port=0 GBP=false DirectRouting=false
    I0329 23:15:03.598548    4615 local_manager.go:147] Found lease (10.2.46.0/24) for current IP (10.12.31.211), reusing
    I0329 23:15:03.622441    4615 main.go:311] Changing default FORWARD chain policy to ACCEPT
    I0329 23:15:03.622590    4615 main.go:319] Wrote subnet file to /run/flannel/subnet.env
    I0329 23:15:03.622621    4615 main.go:323] Running backend.
    I0329 23:15:03.622734    4615 vxlan_network.go:60] watching for new subnet leases
    I0329 23:15:03.651253    4615 main.go:431] Waiting for 22h59m59.996415542s to renew lease
    root@host1:~# ip addr show flannel.1
    9: flannel.1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN group default
        link/ether 0e:38:3f:4c:d5:02 brd ff:ff:ff:ff:ff:ff
        inet 10.2.46.0/32 scope global flannel.1
           valid_lft forever preferred_lft forever
        inet6 fe80::c38:3fff:fe4c:d502/64 scope link
           valid_lft forever preferred_lft forever
    root@host1:~# ip route
    default via 10.12.28.6 dev ens160 onlink
    10.2.1.0/24 via 10.2.1.0 dev flannel.1 onlink
    10.12.28.0/22 dev ens160  proto kernel  scope link  src 10.12.31.211
    172.17.0.0/16 dev docker0  proto kernel  scope link  src 172.17.0.1 linkdown
    172.22.0.0/16 via 10.12.28.1 dev ens160
     
     
     
    root@host2:~# flanneld-amd64 -etcd-endpoints=http://10.12.31.213:2379 -iface=ens160 -etcd-prefix=/docker-test/network &
    I0329 23:14:58.702967    2452 main.go:529] Using interface with name ens160 and address 10.12.31.212
    I0329 23:14:58.703079    2452 main.go:546] Defaulting external address to interface address (10.12.31.212)
    I0329 23:14:58.703267    2452 main.go:244] Created subnet manager: Etcd Local Manager with Previous Subnet: 10.2.1.0/24
    I0329 23:14:58.703295    2452 main.go:247] Installing signal handlers
    I0329 23:14:58.705106    2452 main.go:388] Found network config - Backend type: vxlan
    I0329 23:14:58.705156    2452 vxlan.go:120] VXLAN config: VNI=1 Port=0 GBP=false DirectRouting=false
    I0329 23:14:58.729435    2452 local_manager.go:147] Found lease (10.2.1.0/24) for current IP (10.12.31.212), reusing
    I0329 23:14:58.741472    2452 main.go:311] Changing default FORWARD chain policy to ACCEPT
    I0329 23:14:58.741672    2452 main.go:319] Wrote subnet file to /run/flannel/subnet.env
    I0329 23:14:58.741697    2452 main.go:323] Running backend.
    I0329 23:14:58.741761    2452 vxlan_network.go:60] watching for new subnet leases
    I0329 23:14:58.757628    2452 main.go:431] Waiting for 22h59m59.965049243s to renew lease
    root@host2:~# ip addr show flannel.1
    9: flannel.1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN group default
        link/ether 56:42:ec:d7:7d:7d brd ff:ff:ff:ff:ff:ff
        inet 10.2.1.0/32 scope global flannel.1
           valid_lft forever preferred_lft forever
        inet6 fe80::5442:ecff:fed7:7d7d/64 scope link
           valid_lft forever preferred_lft forever
    root@host2:~# ip route
    default via 10.12.28.6 dev ens160 onlink
    10.2.46.0/24 via 10.2.46.0 dev flannel.1 onlink
    10.12.28.0/22 dev ens160  proto kernel  scope link  src 10.12.31.212
    172.17.0.0/16 dev docker0  proto kernel  scope link  src 172.17.0.1 linkdown
    172.22.0.0/16 via 10.12.28.1 dev ens160
     
     
    etcd库查询方法：
     
    [root@docker-machine ~]# etcdctl --endpoints=10.12.31.213:2379 ls
    /docker-test
    /foo
    [root@docker-machine ~]# etcdctl --endpoints=10.12.31.213:2379 ls /docker-test
    /docker-test/network
    [root@docker-machine ~]# etcdctl --endpoints=10.12.31.213:2379 ls /docker-test/network
    /docker-test/network/config
    /docker-test/network/subnets
    [root@docker-machine ~]# etcdctl --endpoints=10.12.31.213:2379 ls /docker-test/network/config
    /docker-test/network/config
    [root@docker-machine ~]# etcdctl --endpoints=10.12.31.213:2379 get  /docker-test/network/config
    {
      "Network": "10.2.0.0/16",
      "SubnetLen": 24,
      "Backend": {
        "Type": "vxlan"
      }
    }
    [root@docker-machine ~]# etcdctl --endpoints=10.12.31.213:2379 get  /docker-test/network/subnets
    /docker-test/network/subnets: is a directory
    [root@docker-machine ~]# etcdctl --endpoints=10.12.31.213:2379 ls  /docker-test/network/subnets
    /docker-test/network/subnets/10.2.46.0-24
    /docker-test/network/subnets/10.2.1.0-24
    [root@docker-machine ~]# etcdctl --endpoints=10.12.31.213:2379 get  /docker-test/network/subnets/10.2.46.0-24
    {"PublicIP":"10.12.31.211","BackendType":"vxlan","BackendData":{"VtepMAC":"66:2b:a5:56:0d:c6"}}
    [root@docker-machine ~]# etcdctl --endpoints=10.12.31.213:2379 get  /docker-test/network/subnets/10.2.1.0-24
    {"PublicIP":"10.12.31.212","BackendType":"vxlan","BackendData":{"VtepMAC":"8a:8c:b5:42:47:40"}}
     
     
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  • 原文地址：https://www.cnblogs.com/www1707/p/10625056.html
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