根据前文准备好的环境,我们现在来一步步的搭建一个基础的k8s集群 注意,这里的配置信息都是按照我自己的虚拟环境来写的。 把server01作为master节点,server02和server03作为worker节点 各个节点需要配置的服务和命令如下: master节点上需要部署的服务包括:etcd服务APIServer服务Scheduler服务ControllerManager服务CalicoNode服务kube-proxy服务kubectl命令

worker节点上需要部署的服务包括:CalicoNode服务kubelet服务kube-proxy服务

步骤1:准备文件

安装k8s集群有几种方式可以选择,比如容器化的方式,比如用kubeadmin的方式,这次我们打算尝试的是使用二进制文件的方式。

  1. 登录到master虚拟机上(server01),从github上下载安装文件的压缩包,我们使用的是1.13.6版本:

     wget https://github.com/kubernetes/kubernetes/releases/download/v1.13.6/kubernetes.tar.gz
    
  2. 解压缩

    tar zxvf kubernetes.tar.gz
    
  3. 下载文件,进入刚刚解压好的文件夹

    cd kubernetes
    ./cluster/get-kube-binaries.sh
    

    这个步骤因为涉及到从官网下载文件,由于墙的原因会非常缓慢或者失败,请自行上网解决。

步骤2:master环境部署

  1. etcd部署: 编写etcd服务的启动配置文件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=/home/anakin/bin/etcd \
  --name=192.168.32.131 \
  --listen-client-urls=http://192.168.32.131:2379,http://127.0.0.1:2379 \
  --advertise-client-urls=http://192.168.32.131:2379 \
  --data-dir=/var/lib/etcd
Restart=on-failure
RestartSec=5
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

然后执行以下命令:

cp etcd.service /lib/systemd/system/
systemctl enable etcd.service
mkdir -p /var/lib/etcd
service etcd start

如果没有问题的话,etcd服务应该已经跑起来了。

  1. APIServer部署 编写kube-apiserver.service文件,内容如下:
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=network.target
[Service]
ExecStart=/home/anakin/bin/kube-apiserver \
  --admission-control=NamespaceLifecycle,LimitRanger,DefaultStorageClass,ResourceQuota,NodeRestriction \
  --insecure-bind-address=0.0.0.0 \
  --kubelet-https=false \
  --service-cluster-ip-range=10.68.0.0/16 \
  --service-node-port-range=20000-40000 \
  --etcd-servers=http://192.168.32.131:2379 \
  --enable-swagger-ui=true \
  --allow-privileged=true \
  --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

然后执行和启动etcd类似的命令

cp kube-apiserver.service /lib/systemd/system/
systemctl enable kube-apiserver.service
service kube-apiserver start
  1. ControllerManager部署 编写kube-controller-manager.service文件,内容如下:
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
[Service]
ExecStart=/home/anakin/bin/kube-controller-manager \
  --address=127.0.0.1 \
  --master=http://127.0.0.1:8080 \
  --allocate-node-cidrs=true \
  --service-cluster-ip-range=10.68.0.0/16 \
  --cluster-cidr=172.20.0.0/16 \
  --cluster-name=kubernetes \
  --leader-elect=true \
  --cluster-signing-cert-file= \
  --cluster-signing-key-file= \
  --v=2
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target

然后,同样的方式启动服务:

cp kube-controller-manager.service /lib/systemd/system/
systemctl enable kube-controller-manager.service
service kube-controller-manager start
  1. Scheduler部署 编写kube-scheduler.service文件,内容如下:
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/GoogleCloudPlatform/kubernetes

[Service]
ExecStart=/home/anakin/bin/kube-scheduler \
  --address=127.0.0.1 \
  --master=http://127.0.0.1:8080 \
  --leader-elect=true \
  --v=2
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target

然后,继续上面的启动方式:

cp kube-scheduler.service /lib/systemd/system/
systemctl enable kube-scheduler.service
service kube-scheduler start
  1. CalicoNode部署 编写kube-calico.service文件,内容如下:
[Unit]
Description=calico node
After=docker.service
Requires=docker.service

[Service]
User=root
PermissionsStartOnly=true
ExecStart=/usr/bin/docker run --net=host --privileged --name=calico-node \
  -e ETCD_ENDPOINTS=http://192.168.32.131:2379 \
  -e CALICO_LIBNETWORK_ENABLED=true \
  -e CALICO_NETWORKING_BACKEND=bird \
  -e CALICO_DISABLE_FILE_LOGGING=true \
  -e CALICO_IPV4POOL_CIDR=172.20.0.0/16 \
  -e CALICO_IPV4POOL_IPIP=off \
  -e FELIX_DEFAULTENDPOINTTOHOSTACTION=ACCEPT \
  -e FELIX_IPV6SUPPORT=false \
  -e FELIX_LOGSEVERITYSCREEN=info \
  -e FELIX_IPINIPMTU=1440 \
  -e FELIX_HEALTHENABLED=true \
  -e IP=192.168.32.131 \
  -v /var/run/calico:/var/run/calico \
  -v /lib/modules:/lib/modules \
  -v /run/docker/plugins:/run/docker/plugins \
  -v /var/run/docker.sock:/var/run/docker.sock \
  -v /var/log/calico:/var/log/calico \
  registry.anakin.sun.com/k8s/calico-node:v2.6.2
  ExecStop=/usr/bin/docker rm -f calico-node
Restart=always
RestartSec=10

[Install]
WantedBy=multi-user.target

同样的方式启动:

cp kube-calico.service /lib/systemd/system/
systemctl enable kube-calico.service
service kube-calico start
  1. kubectl命令配置 执行以下命令(root):
kubectl config set-cluster kubernetes  --server=http://192.168.1.102:8080
kubectl config set-context kubernetes --cluster=kubernetes
kubectl config use-context kubernetes

如果有问题,可以手动修改配置文件:~/.kube/config

  1. kube-proxy服务部署 编写kube-proxy.service文件,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=/home/anakin/bin/kube-proxy \
  --bind-address=192.168.32.131 \
  --hostname-override=192.168.32.131 \
  --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig \
  --logtostderr=true \
  --v=2
Restart=on-failure
RestartSec=5
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

编写kube-proxy.kubeconfig文件,内容如下:

apiVersion: v1
clusters:
- cluster:
    server: http://192.168.32.131:8080
  name: kubernetes
contexts:
- context:
    cluster: kubernetes
  name: default
current-context: default
kind: Config
preferences: {}
users: []

然后执行如下命令:

mkdir -p /var/lib/kube-proxy
cp kube-proxy.service /lib/systemd/system/
cp kube-proxy.kubeconfig /etc/kubernetes/
systemctl enable kube-proxy.service

OK,至此,master节点应该已经配置完成了。

步骤3:worker环境部署

  1. CalicoNode部署 参考master部分的内容

  2. kube-proxy服务部署 参考master部分的内容

  3. kubelet服务配置 编写kubelet.service文件,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=/home/anakin/bin/kubelet \
  --address=192.168.32.131 \
  --hostname-override=192.168.32.131 \
  --pod-infra-container-image=registry.anakin.sun.com/imooc/pause-amd64:3.0 \
  --kubeconfig=/etc/kubernetes/kubelet.kubeconfig \
  --network-plugin=cni \
  --cni-conf-dir=/etc/cni/net.d \
  --cni-bin-dir=/home/anakin/bin \
  --cluster-dns=10.68.0.2 \
  --cluster-domain=cluster.local. \
  --allow-privileged=true \
  --fail-swap-on=false \
  --logtostderr=true \
  --v=2
ExecStartPost=/sbin/iptables -A INPUT -s 10.0.0.0/8 -p tcp --dport 4194 -j ACCEPT
ExecStartPost=/sbin/iptables -A INPUT -s 172.16.0.0/12 -p tcp --dport 4194 -j ACCEPT
ExecStartPost=/sbin/iptables -A INPUT -s 192.168.0.0/16 -p tcp --dport 4194 -j ACCEPT
ExecStartPost=/sbin/iptables -A INPUT -p tcp --dport 4194 -j DROP
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target

编写kubelet.kubeconfig文件,内容如下:

apiVersion: v1
clusters:
- cluster:
    insecure-skip-tls-verify: true
    server: http://192.168.32.131:8080
  name: kubernetes
contexts:
- context:
    cluster: kubernetes
    user: ""
  name: system:node:kube-master
current-context: system:node:kube-master
kind: Config
preferences: {}
users: []

编写10-calico.conf文件,内容如下:

{
    "name": "calico-k8s-network",
    "cniVersion": "0.1.0",
    "type": "calico",
    "etcd_endpoints": "http://192.168.32.131:2379",
    "log_level": "info",
    "ipam": {
        "type": "calico-ipam"
    },
    "kubernetes": {
        "k8s_api_root": "http://192.168.32.131:8080"
    }
}

然后,执行如下命令:

mkdir -p /var/lib/kubelet
mkdir -p /etc/kubernetes
mkdir -p /etc/cni/net.d

cp kubelet.service /lib/systemd/system/
cp kubelet.kubeconfig /etc/kubernetes/
cp 10-calico.conf /etc/cni/net.d/

systemctl enable kubelet.service
service kubelet start

至此,整个集群应该已经搭建好了,如果中间遇到什么问题,可以通过查看系统日志,或者google解决。