Kubernetes (K8S)

preface

Kubernetes study notes, write them down! 💻 🚀

Prepare three CentOS 7.0+ machines, change the Hostname to Master, node-01, and Node-02:

node	The IP address
Master	10.211.55.7
node-01	10.211.55.8
node-02	10.211.55.9

I have created three new virtual machines:

Configure the /etc/hosts file for all machines:

vi /etc/hosts
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Add the following three lines and save and exit.

10.211.55.7 Master
10.211.55.8 node-01
10.211.55.9 node-02
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Disabling the Firewall

1. Run sudo systemctl stop firewalld.service to disable the firewall

2. Run the sudo systemctl disable firewalld.service command to disable the system startup

Check the firewall status: firewall-cmd –state

Check whether the systemctl is-enabled firewalld.service command is used to start the system

Disable SELINUX

sudo setenforce 0
sudo vi /etc/selinux/config
Change #SELINUX to disabled
SELINUX=disabled
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None example Disable the Swap partition

To disable the Swap command, run the following command:

swapoff -a
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In addition, you need to modify the /etc/fstab file to comment out the automatic mounting of SWAP to prevent SWAP from being enabled after the machine restarts. Use the following command:

vi /etc/fstab
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Comment the swap line and save and exit.

# /dev/mapper/centos-swap swap swap defaults 0 0
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To confirm that swap is closed, run the following command:

free -m
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If the swap output is 0, the swap is disabled.

Start the installation

yum -y install epel-release
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Then upgrade to the latest version:

yum update
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Start installation :(for all hosts)

yum install -y etcd kubernetes-master ntp flannel
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Etcd 3.3.11, Flannel 0.7.1 and Kubernetes-Master 1.5.2 are installed.

Continue installing Node:

yum install -y kubernetes-node ntp flannel docker
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Time check :(all hosts)

systemctl start ntpd
ntpdate ntp1.aliyun.com
hwclock -w
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Configure the ETCD server

Master: edit etcd. Conf file:

vim /etc/etcd/etcd.conf
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Modify it to the following:

ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="http://0.0.0.0:2380"
ETCD_LISTEN_CLIENT_URLS="Http://0.0.0.0:2379, http://0.0.0.0:4001
ETCD_NAME="master"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://10.211.55.7:2380"
ETCD_ADVERTISE_CLIENT_URLS="Http://10.211.55.7:2379, http://10.211.55.7:4001
ETCD_INITIAL_CLUSTER="Master = http://10.211.55.7:2380, node01 = http://10.211.55.8:2380, node02 = http://10.211.55.9:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
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Check whether to modify:

grep -v '^ #' /etc/etcd/etcd.conf
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Start the ETcd service

systemctl start etcd
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Check the ETCD cluster status

etcdctl cluster-health
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Check the list of etCD cluster members. There is only one

etcdctl  member  list
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Node01: Edit the etcd.conf file:

vim /etc/etcd/etcd.conf
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Modify it to the following:

ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="http://0.0.0.0:2380"
ETCD_LISTEN_CLIENT_URLS="Http://0.0.0.0:2379, http://0.0.0.0:4001
ETCD_NAME="node02"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://10.211.55.8:2380"
ETCD_ADVERTISE_CLIENT_URLS="Http://10.211.55.8:2379, http://10.211.55.8:4001
ETCD_INITIAL_CLUSTER="Master = http://10.211.55.7:2380, node01 = http://10.211.55.8:2380, node02 = http://10.211.55.9:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
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Start the ETcd service

systemctl start etcd
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Check the ETCD cluster status

etcdctl cluster-health
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Check the etCD cluster member list

etcdctl  member  list
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Node02:

Edit the etcd.conf file:

vim /etc/etcd/etcd.conf
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Modify it to the following:

ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="http://0.0.0.0:2380"
ETCD_LISTEN_CLIENT_URLS="Http://0.0.0.0:2379, http://0.0.0.0:4001
ETCD_NAME="node02"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://10.211.55.9:2380"
ETCD_ADVERTISE_CLIENT_URLS="Http://10.211.55.9:2379, http://10.211.55.9:4001
ETCD_INITIAL_CLUSTER="Master = http://10.211.55.7:2380, node01 = http://10.211.55.8:2380, node02 = http://10.211.55.9:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
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Start the ETcd service

systemctl start etcd
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Check the ETCD cluster status

etcdctl cluster-health
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Check the etCD cluster member list

etcdctl  member  list
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Configuring the Master Server

1) Configure the kube-Apiserver profile

[root@Master ~]# grep -v ‘^#’ /etc/kubernetes/config

KUBE_LOGTOSTDERR="--logtostderr=true"
KUBE_LOG_LEVEL="--v=0"
KUBE_ALLOW_PRIV="--allow-privileged=false"
KUBE_MASTER="-- master = http://10.10.10.14:8080"
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[root@Master ~]# grep -v ‘^#’ /etc/kubernetes/apiserver

KUBE_API_ADDRESS="-- insecure - bind - address = 0.0.0.0"
KUBE_ETCD_SERVERS="-- etcd - the servers = http://10.10.10.14:2379"
KUBE_SERVICE_ADDRESSES="- service - cluster - IP - range = 10.254.0.0/16"
KUBE_ADMISSION_CONTROL="--admission-control=AlwaysAdmit"
KUBE_API_ARGS=""
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2) Configure the kube-Controller-manager configuration file

[root@Master ~]# grep -v ‘^#’ /etc/kubernetes/controller-manager

KUBE_CONTROLLER_MANAGER_ARGS=""
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3) Configure the kube-Scheduler configuration file

[root@Master ~]# grep -v ‘^#’ /etc/kubernetes/scheduler

KUBE_SCHEDULER_ARGS="- the address = 0.0.0.0"
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4) Start the service

for i in  kube-apiserver kube-controller-manager kube-scheduler;do systemctl restart $i; systemctl enable $i;done
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Configure the node01 server

1) the configuration etcd

/ root @ Master ~ # etcdctl set/atomic. IO/network/config ‘{” network “:” along / 16 “}’

{"Network": "Along / 16"}
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2) Configure the Node1 network. In this example, flannel is used. For other methods, please refer to the official website of Kubernetes.

[root@node01 ~]# grep -v ‘^#’ /etc/sysconfig/flanneld

FLANNEL_ETCD_ENDPOINTS="http://10.211.55.8:2379"
FLANNEL_ETCD_PREFIX="/atomic.io/network"
FLANNEL_OPTIONS=""
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View authentication network information

[root@Master ~]# etcdctl get /atomic.io/network/config

{ "Network": "Along / 16" }
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[root@Master ~]# etcdctl ls /atomic.io/network/subnets

/ atomic. IO/network/subnets / 172.16.69.0-24 / atomic. IO/network/subnets / 172.16.6.0-24Copy the code

/ root @ Master ~ # etcdctl get/atomic. IO/network/subnets / 172.16.6.0-24

{"PublicIP":"10.211.55.8"}
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/ root @ Master ~ # etcdctl get/atomic. IO/network/subnets / 172.16.69.0-24

{"PublicIP":"10.211.55.9"}
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3) Configure node1 kube-proxy

[root@node01 ~]# grep -v ‘^#’ /etc/kubernetes/config

KUBE_LOGTOSTDERR="--logtostderr=true"
KUBE_LOG_LEVEL="--v=0"
KUBE_ALLOW_PRIV="--allow-privileged=false"
KUBE_MASTER="-- master = http://10.10.10.14:8080"
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[root@node01 ~]# grep -v ‘^#’ /etc/kubernetes/proxy

KUBE_PROXY_ARGS="-- bind = address = 0.0.0.0"
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4) Configure node1 kubelet

[root@node01 ~]# grep -v ‘^#’ /etc/kubernetes/kubelet

KUBELET_ADDRESS="- the address = 127.0.0.1"
KUBELET_HOSTNAME="- the hostname - override = 10.10.10.15"
KUBELET_API_SERVER="- API - the servers = http://10.10.10.14:8080"
KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"
KUBELET_ARGS=""
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5) Start the node01 service

for i in flanneld kube-proxy kubelet docker;do systemctl restart $i; systemctlenable $i; systemctl status$i ;done
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Configure the node02 server

The configurations for node2 and node1 are the same except for the following

[root@node2 ~]# vi /etc/kubernetes/kubelet

KUBELET_HOSTNAME="- the hostname - override = 10.211.55.9"
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Look at the node

[root@Master ~]# kubectl get nodes

NAME          STATUS    AGE
10.211.55.8   Ready     18h
10.211.55.9   Ready     13h
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The last

“Some roads, go on, will be very tired! Don’t go, will regret! ️ ️”

Welcome to follow your wechat official account: Tao Li Bao Chun Personal blog: Leeyunt. Top

preface

Configure the /etc/hosts file for all machines:

Disabling the Firewall

Disable SELINUX

None example Disable the Swap partition

Start the installation

Configure the ETCD server

Configuring the Master Server

1) Configure the kube-Apiserver profile

2) Configure the kube-Controller-manager configuration file

3) Configure the kube-Scheduler configuration file

4) Start the service

Configure the node01 server

1) the configuration etcd

2) Configure the Node1 network. In this example, flannel is used. For other methods, please refer to the official website of Kubernetes.

3) Configure node1 kube-proxy

4) Configure node1 kubelet

5) Start the node01 service

Configure the node02 server

The last

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