kubernetes集群部署

作者: 丶兔小胖 | 来源:发表于2019-02-25 17:47 被阅读0次

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centos7 k8s集群部署

设置时间:timedatectl set-timezone Asia/Shanghai
安装k8s集群前期准备：
网络环境：

节点	主机名称	ip
master	k8s_master	192.168.192.128
node1	k8s_client1	192.168.192.129
node2	k8s_client2	192.168.192.130

centos7版本:

[root@localhost ~]# cat /etc/redhat-release 
CentOS Linux release 7.6.1810 (Core)

关闭firewalld:

关闭:service iptables stop
开启:service iptables start

1. 三台主机基础服务安装:

[root@localhost ~]#yum -y update
[root@localhost ~]#yum -y install net-tools wget vim ntp
[root@localhost ~]#systemctl enable ntpd
[root@localhost ~]#systemctl start ntpd

2. 分别在三台主机，设置主机名:

master
hostnamectl --static set-hostname k8s_master
node1
hostnamectl --static set-hostname k8s_client1
node2
hostnamectl --static set-hostname k8s_client2

3. 设置hosts,分别再三台主机执行:

cat <<EOF > /etc/hosts
192.168.192.128 k8s_master
192.168.192.129 k8s_client1
192.168.192.130 k8s_client2
EOF

4. 部署master操作:

[root@localhost ~]#yum -y install etcd

编辑配置文件 /etc/etcd/etcd.conf

[root@k8s_master kubernetes]#  cat /etc/etcd/etcd.conf | grep -v "^#"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379,http://0.0.0.0:4001"
ETCD_NAME="master"
ETCD_ADVERTISE_CLIENT_URLS="http://k8s_master:2379,http://k8s_master:4001"

设置开机启动并验证状态:

[root@k8s_master kubernetes]#systemctl enable etcd
[root@k8s_master kubernetes]#systemctl start etcd

etcd检查:

[root@k8s_master kubernetes]# etcdctl -C http://k8s_master:4001 cluster-health
member 8e9e05c52164694d is healthy: got healthy result from http://k8s_master:2379
cluster is healthy

[root@k8s_master kubernetes]# etcdctl -C http://k8s_master:2379 cluster-health
member 8e9e05c52164694d is healthy: got healthy result from http://k8s_master:2379
cluster is healthy

5. 安装kubernetes

[root@k8s_master ~]# yum install kubernetes

修改apiserver服务配置文件:(master节点)

[root@k8s_master kubernetes]#  cat /etc/kubernetes/apiserver | grep -v "^#"
KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"
KUBE_API_PORT="--port=8080"
KUBE_ETCD_SERVERS="--etcd-servers=http://192.168.192.128:2379"
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"
KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota"
KUBE_API_ARGS=""

修改config配置文件:(master节点)

[root@k8s_master kubernetes]#  cat /etc/kubernetes/config | grep -v "^#"
KUBE_LOGTOSTDERR="--logtostderr=true"
KUBE_LOG_LEVEL="--v=0"
KUBE_ALLOW_PRIV="--allow-privileged=false"
KUBE_MASTER="--master=http://192.168.192.128:8080"

设置开机启动，开启服务:(master节点)

[root@k8s_master ~]#systemctl enable kube-apiserver kube-controller-manager kube-scheduler
[root@k8s_master ~]#systemctl start kube-apiserver kube-controller-manager kube-scheduler

查看服务端口:(master节点)

[root@k8s_master kubernetes]# netstat -tnlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 127.0.0.1:2380          0.0.0.0:*               LISTEN      22398/etcd          
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      6641/sshd           
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      6899/master         
tcp6       0      0 :::10251                :::*                    LISTEN      24193/kube-schedule 
tcp6       0      0 :::6443                 :::*                    LISTEN      24128/kube-apiserve 
tcp6       0      0 :::2379                 :::*                    LISTEN      22398/etcd          
tcp6       0      0 :::10252                :::*                    LISTEN      24143/kube-controll 
tcp6       0      0 :::8080                 :::*                    LISTEN      24128/kube-apiserve 
tcp6       0      0 :::22                   :::*                    LISTEN      6641/sshd           
tcp6       0      0 :::23                   :::*                    LISTEN      1/systemd           
tcp6       0      0 ::1:25                  :::*                    LISTEN      6899/master         
tcp6       0      0 :::4001                 :::*                    LISTEN      22398/etcd

6. Node节点主机做以下配置：

修改config与kubelet配置:

[root@k8s_client1 ~]# cat /etc/kubernetes/config | grep -v "^#"
KUBE_LOGTOSTDERR="--logtostderr=true"
KUBE_LOG_LEVEL="--v=0"
KUBE_ALLOW_PRIV="--allow-privileged=false"
KUBE_MASTER="--master=http://192.168.192.128:8080"
[root@k8s_client1 ~]# cat /etc/kubernetes/kubelet | grep -v "^#"
KUBELET_ADDRESS="--address=0.0.0.0"
KUBELET_HOSTNAME="--hostname-override=192.168.192.129"
KUBELET_API_SERVER="--api-servers=http://192.168.192.128:8080"
KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"
KUBELET_ARGS=""

设置开机启动、开启服务:

[root@k8s_client1 ~]# systemctl enable kubelet kube-proxy
[root@k8s_client1 ~]# systemctl start kubelet kube-proxy

查看端口:

[root@k8s_client1 ~]#  netstat -ntlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 127.0.0.1:10248         0.0.0.0:*               LISTEN      97902/kubelet       
tcp        0      0 127.0.0.1:10249         0.0.0.0:*               LISTEN      97633/kube-proxy    
tcp        0      0 127.0.0.1:2380          0.0.0.0:*               LISTEN      22376/etcd          
tcp        0      0 127.0.0.1:8080          0.0.0.0:*               LISTEN      96328/kube-apiserve 
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      6651/sshd           
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      6869/master         
tcp6       0      0 :::10250                :::*                    LISTEN      97902/kubelet       
tcp6       0      0 :::10251                :::*                    LISTEN      96430/kube-schedule 
tcp6       0      0 :::6443                 :::*                    LISTEN      96328/kube-apiserve 
tcp6       0      0 :::2379                 :::*                    LISTEN      22376/etcd          
tcp6       0      0 :::10252                :::*                    LISTEN      96419/kube-controll 
tcp6       0      0 :::10255                :::*                    LISTEN      97902/kubelet       
tcp6       0      0 :::22                   :::*                    LISTEN      6651/sshd           
tcp6       0      0 :::23                   :::*                    LISTEN      1/systemd           
tcp6       0      0 ::1:25                  :::*                    LISTEN      6869/master         
tcp6       0      0 :::4001                 :::*                    LISTEN      22376/etcd          
tcp6       0      0 :::4194                 :::*                    LISTEN      97902/kubelet

7.查看状态

Master上查看集群中的节点及节点状态

[root@k8s_master kubernetes]# kubectl get node
NAME              STATUS    AGE
192.168.192.129   Ready     2h
192.168.192.130   Ready     2h

8. 安装fiannel

flannel是CoreOS提供用于解决Dokcer集群跨主机通讯的覆盖网络工具。它的主要思路是：预先留出一个网段,每个主机使用其中一部分,然后每个容器被分配不同的ip；让所有的容器认为大家在同一个直连的网络，底层通过UDP/VxLAN等进行报文的封装和转发。

master/node上flannel安装：

[root@k8s_master ~]#yum install flannel

flannel配置:(master node使用master的ip相同)

[root@k8s_master kubernetes]# cat /etc/sysconfig/flanneld | grep -v "^#"
FLANNEL_ETCD_ENDPOINTS="http://192.168.192.128:2379"
FLANNEL_ETCD_PREFIX="/atomic.io/network"

添加网络:(docker默认网段172.17.0.0)master node都要执行

[root@k8s_master ~]# etcdctl mk /atomic.io/network/config '{"Network":"172.17.0.0/16"}'

设置开机启动:

启动时候删除docker0网络:sudo ip link delete docker0
[root@k8s_master ~]# systemctl enable flanneld
[root@k8s_master ~]# systemctl start flanneld

master/node节点重启服务：

master:

for
SERVICES in docker kube-apiserver kube-controller-manager kube-scheduler; 
do systemctl restart $SERVICES ; 
done

node:

for 
SERVICES in kube-proxy kubelet docker flanneld;
do systemctl restart $SERVICES;
systemctl enable $SERVICES;
systemctl status $SERVICES;
done

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