Hippopo

A very lazy programmer.

离线部署Kubernetes v1.5.7 + calico

k8s部署拓扑图

Master+ETCD

准备工作：

download dk8s.tar.gz 百度盘 密码: 478m

基础环境准备：需要在所有master/minion节点上执行

1. download dk8s.tar.gz
2. tar zxvf  dk8s.tar.gz
3. cp -r dk8s/local /root/
4. export PATH=$PATH:/root/local/bin

注：

  1. 以下操作是ubuntu16 systemctl配置方式，ubuntu14请按照修改项修改script里面的脚本启动。
  2. 以下所有kubectl命令都是在master上执行的。

搭建单节点etcd

dk8s/master/etcd/etcd.service 内容如下：

[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
Documentation=https://github.com/coreos

[Service]
Type=notify
WorkingDirectory=/var/lib/etcd/
ExecStart=/root/local/bin/etcd \
  --name=etcd-host0 \
  --initial-advertise-peer-urls=http://192.168.56.135:2380 \
  --listen-peer-urls=http://192.168.56.135:2380 \
  --listen-client-urls=http://192.168.56.135:2379,http://127.0.0.1:2379 \
  --advertise-client-urls=http://192.168.56.135:2379 \
  --initial-cluster-token=etcd-cluster-0 \
  --initial-cluster=etcd-host0=http://192.168.56.135:2380 \
  --initial-cluster-state=new \
  --data-dir=/var/lib/etcd
Restart=on-failure
RestartSec=5
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

修改etcd ip地址之后,执行

mkdir /var/lib/etcd  #创建etcd data-dir
cp dk8s/master/etcd/etcd.service /etc/systemctl/system/
systemctl daemon-reload
systemctl enable etcd
systemctl start etcd

启动kube-apiserver

dk8s/master/kube-apiserver/kube-apiserver.service 内容如下：

[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=network.target

[Service]
ExecStart=/root/local/bin/kube-apiserver \
  --admission-control= \
  --advertise-address=192.168.56.135 \
  --insecure-bind-address=0.0.0.0 \
  --service-cluster-ip-range=10.254.0.0/16 \
  --service-node-port-range=30000-60000 \
  --etcd-servers=http://192.168.56.135:2379 \
  --enable-swagger-ui=true \
  --allow-privileged=true \
  --apiserver-count=3 \
  --audit-log-maxage=30 \
  --audit-log-maxbackup=3 \
  --audit-log-maxsize=100 \
  --audit-log-path=/var/lib/audit.log \
  --event-ttl=1h \
  --v=2
Restart=on-failure
RestartSec=5
Type=notify
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

修改：

  • –advertise-address=本机ip
  • –etcd-servers=http://<etcd ip>:<port>
cp dk8s/master/kube-apiserver/kube-apiserver.service /etc/systemctl/system/
systemctl daemon-reload
systemctl enable kube-apiserver
systemctl start kube-apiserver

这时netstat -nltp 能看到8080端口kube-apiserver服务已经启动

启动kube-scheduler

dk8s/master/kube-scheduler/kube-scheduler.service 内容如下：

[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/GoogleCloudPlatform/kubernetes

[Service]
ExecStart=/root/local/bin/kube-scheduler \
  --address=127.0.0.1 \
  --master=http://192.168.56.135:8080 \
  --leader-elect=true \
  --v=2
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target

修改：

  • –master=http://<apiserver ip>:<port>
cp dk8s/master/kube-scheduler/kube-scheduler.service /etc/systemctl/system/
systemctl daemon-reload
systemctl enable kube-scheduler
systemctl start kube-scheduler

启动kube-controller-manager

dk8s/master/kube-controller/kube-controller-manager.service 内容如下：

[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/GoogleCloudPlatform/kubernetes

[Service]
ExecStart=/root/local/bin/kube-controller-manager \
  --address=127.0.0.1 \
  --master=http://192.168.56.135:8080 \
  --allocate-node-cidrs=true \
  --service-cluster-ip-range=10.254.0.0/16 \
  --cluster-cidr=172.30.0.0/16 \
  --cluster-name=kubernetes \
  --leader-elect=true \
  --v=2
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target

修改:

  • –master=http://<apiserver ip>:<port>
  • –cluster-cidr=Pod网段（这个cidr和两个服务有关kube-controller-manager、calico.yaml；而kube-proxy的cluster-cidr==service-cluster-ip-range）
cp dk8s/master/kube-controller/kube-controller-manager.service /etc/systemctl/system/
systemctl daemon-reload
systemctl enable kube-controller-manager
systemctl start kube-controller-manager

至此master服务部署基本完成，bird进程是后面部署calico时创建的，现在不用管.

root@master:~# kubectl get cs
NAME                 STATUS    MESSAGE              ERROR
controller-manager   Healthy   ok
scheduler            Healthy   ok
etcd-0               Healthy   {"health": "true"}

root@master:~# netstat -nltp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      1118/sshd
tcp        0      0 127.0.0.1:10251         0.0.0.0:*               LISTEN      4623/kube-scheduler
tcp        0      0 192.168.56.135:2379     0.0.0.0:*               LISTEN      2246/etcd
tcp        0      0 127.0.0.1:2379          0.0.0.0:*               LISTEN      2246/etcd
tcp        0      0 127.0.0.1:10252         0.0.0.0:*               LISTEN      2633/kube-controlle
tcp        0      0 192.168.56.135:2380     0.0.0.0:*               LISTEN      2246/etcd
tcp        0      0 0.0.0.0:179             0.0.0.0:*               LISTEN      11156/bird
tcp        0      0 127.0.1.1:53            0.0.0.0:*               LISTEN      1195/dnsmasq
tcp6       0      0 :::22                   :::*                    LISTEN      1118/sshd
tcp6       0      0 :::6443                 :::*                    LISTEN      5289/kube-apiserver
tcp6       0      0 :::8080                 :::*                    LISTEN      5289/kube-apiserver

Minion

启动kubelet

dk8s/minion/kubelet/kubelet.service 内容如下：

[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=docker.service
Requires=docker.service

[Service]
WorkingDirectory=/var/lib/kubelet
ExecStart=/root/local/bin/kubelet \
  --api-servers=http://192.168.56.135:8080 \
  --address=192.168.56.136 \
  --hostname-override=192.168.56.136 \
  --cluster_dns=10.254.0.2 \
  --cluster_domain=cluster.local. \
  --hairpin-mode promiscuous-bridge \
  --allow-privileged=true \
  --serialize-image-pulls=false \
  --logtostderr=true \
  --pod-infra-container-image="visenzek8s/pause-amd64:3.0" \
  --network-plugin=cni \
  --network-plugin-dir=/etc/cni/net.d \
  --v=2
ExecStopPost=/sbin/iptables -A INPUT -s 10.0.0.0/8 -p tcp --dport 4194 -j ACCEPT
ExecStopPost=/sbin/iptables -A INPUT -s 172.16.0.0/12 -p tcp --dport 4194 -j ACCEPT
ExecStopPost=/sbin/iptables -A INPUT -s 192.168.0.0/16 -p tcp --dport 4194 -j ACCEPT
ExecStopPost=/sbin/iptables -A INPUT -p tcp --dport 4194 -j DROP
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target

修改:

  • –api-servers=http://<apiserver ip>:<port>
  • –address=本机IP
  • –hostname-override=本机IP
apt-get install bridge-utils socat
cp dk8s/minion/kubelet/kubelet.service /etc/systemctl/system/
cp dk8s/master/calico/nsenter /usr/local/bin/
mkdir /var/lib/kubelet
cp -r dk8s/master/calico/cni /opt/

mkdir -p /etc/cni/net.d


systemctl daemon-reload
systemctl enable kubelet
systemctl start kubelet

启动kube-proxy

dk8s/minion/kube-proxy/kube-proxy.service 内容如下：

[Unit]
Description=Kubernetes Kube-Proxy Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=network.target

[Service]
WorkingDirectory=/var/lib/kube-proxy
ExecStart=/root/local/bin/kube-proxy \
  --master=http://192.168.56.135:8080 \
  --bind-address=192.168.56.136 \
  --hostname-override=192.168.56.136 \
  --cluster-cidr=10.254.0.0/16 \
  --logtostderr=true \
  --v=2
Restart=on-failure
RestartSec=5
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

修改:

  • –master=http://<apiserver ip>:<port>
  • –bind-address=本机IP
  • –hostname-owveride=本机IP
  • –cluster-cidr kube-proxy 根据 –cluster-cidr 判断集群内部和外部流量，指定 –cluster-cidr 或 –masquerade-all 选项后 kube-proxy 才会对访问 Service IP 的请求做 SNAT；
mkdir /var/lib/kube-proxy
cp kube-proxy.service /etc/systemctl/system/
systemctl daemon-reload
systemctl enable kube-proxy
systemctl start kube-proxy

至此minion部署完毕

在master上执行

root@master:~# kubectl get nodes
NAME             STATUS    AGE
192.168.56.136   Ready     21h
192.168.56.137   Ready     19h
192.168.56.138   Ready     18h

部署calico

准备镜像, 在minion节点上

cd k8s.images
for f in *.dif;do docker load -i $f;done
for f in calico/*.dif;do docker load -i $f;done

在master节点上：

dk8s/master/calico/calico.yaml 修改:

  • etcd_endpoints: “http://192.168.56.135:2379”对应etcd地址
  • CALICO_IPV4POOL_CIDR对应kube-controller-manager配置的–cluster-cidr的值
  • IP_AUTODETECTION_METHOD指定calico绑定Node的哪一个eth
  • CALICO_IPV4POOL_IPIP off
root@master:~/dk8s/master/calico# kubectl apply -f calico.yaml
root@master:~/dk8s# kubectl get pods --namespace=kube-system -o wide
NAME                                       READY     STATUS    RESTARTS   AGE       IP               NODE
calico-node-1kpqd                          2/2       Running   0          18h       192.168.56.138   192.168.56.138
calico-node-9bp5d                          2/2       Running   0          18h       192.168.56.136   192.168.56.136
calico-node-js8hk                          2/2       Running   0          18h       192.168.56.137   192.168.56.137
calico-policy-controller-279105993-jlg4w   1/1       Running   0          18h       192.168.56.137   192.168.56.137

修改dk8s/master/calico/conf/calico.conf中etcd地址

root@master:~/dk8s/master/calico# ./get_nodes.sh
NAME      ASN       IPV4                IPV6
minion1   (64512)   192.168.56.136/24
minion2   (64512)   192.168.56.137/24
minion3   (64512)   192.168.56.138/24

这时候所有的minion节点都配好calico服务了，为了让master能ping通pod，还需要我们自己手动启动caliconode。 在master上执行

calicoctl node run -c dk8s/master/calico/conf/calico.conf #可以通过--ip-autodetection-method 参数指定interface

root@master:~/dk8s/master/calico# ./get_nodes.sh
NAME      ASN       IPV4                IPV6
master    (64512)   192.168.56.135/24
minion1   (64512)   192.168.56.136/24
minion2   (64512)   192.168.56.137/24
minion3   (64512)   192.168.56.138/24

root@master:~# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.0.2.1        0.0.0.0         UG    100    0        0 enp0s8
10.0.2.0        0.0.0.0         255.255.255.0   U     100    0        0 enp0s8
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 enp0s3
172.17.0.0      0.0.0.0         255.255.0.0     U     0      0        0 docker0
172.30.34.64    192.168.56.136  255.255.255.192 UG    0      0        0 enp0s3
172.30.51.128   192.168.56.138  255.255.255.192 UG    0      0        0 enp0s3
172.30.180.0    192.168.56.137  255.255.255.192 UG    0      0        0 enp0s3
172.30.219.64   0.0.0.0         255.255.255.192 U     0      0        0 *
192.168.56.0    0.0.0.0         255.255.255.0   U     0      0        0 enp0s3

172.30.0.0/16就是pod获取到的ip网段。

Dashboard

dk8s/master/kube-dashboard/heapster/heapster.yaml修改:

  • –source=kubernetes:https://kubernetes.default 为 –source=kubernetes:http://<apiserver ip>:<port>?inClusterConfig=false

dk8s/master/kube-dashboard/dashboard.yaml、dk8s/master/kube-dashboard/head.yaml修改:

  • –apiserver-host=http://<apiserver ip>:<port>
kubectl create -f dk8s/master/kube-dashboard/heapster
kubectl create -f dk8s/masterkube-dashboard

dns

dk8s/master/dns/skydns-rc.yaml 修改:

  • –kube-master-url=http://<apiserver ip>:<port>
kubectl create -f dk8s/master/dns

nginx 测试

kubectl create -f dk8s/test-nginx
service "nginx-ds" created
daemonset "nginx-ds" created

1.测试service dns

root@master:~# kubectl exec busybox -- nslookup nginx-ds
Server:    10.254.0.2
Address 1: 10.254.0.2 kube-dns.kube-system.svc.cluster.local

Name:      nginx-ds
Address 1: 10.254.42.90 nginx-ds.default.svc.cluster.local

2.测试pod Ip

root@master:~# kubectl get pods --all-namespaces -o wide |grep nginx-ds
default       nginx-ds-47mwz                               1/1       Running   0          30m       172.30.180.14    192.168.56.137
default       nginx-ds-fft61                               1/1       Running   0          30m       172.30.34.82     192.168.56.136
default       nginx-ds-mt8fx                               1/1       Running   0          30m       172.30.51.149    192.168.56.138

root@master:~# wget 172.30.180.14:80
--2017-06-01 18:59:52--  http://172.30.180.14/
Connecting to 172.30.180.14:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 612 [text/html]
Saving to: ‘index.html’

index.html                                            100%[======================================================================================================================>]     612  --.-KB/s    in 0s      

2017-06-01 18:59:52 (173 MB/s) - ‘index.html’ saved [612/612]

3.测试集群内部服务

root@master:~# kubectl exec busybox -- wget nginx-ds:80
Connecting to nginx-ds (10.254.42.90:80)
index.html           100% |*******************************|   612   0:00:00 ETA

4.测试外部服务：浏览器访问任意<node ip>:36666,会显示nginx页面