k8s installation and deployment steps

k8s installation and deployment steps

Preparation environment: three centos7 servers

192.168.6.129 k8s-master (master)

192.168.6.130 k8s-node-1 (node)

192.168.6.131 k8s-node-2 (node)

kubernetes (k8s) installation methods

Five methods:

• kubernetes binary installation (the most tedious configuration, no less than installing openstack)

• kubeadm installation (automated installation tool launched by Google, network requirements apply)

• minikube installation (only used to experience k8s)

• yum installation (the simplest, the version is relatively low====This method is recommended for learning)

• go compile and install (the most difficult)

We use yum to install, and learning how to use k8s is the key.

1. Modify the host and host resolution

#Please perform the following operations on the three machines 129-130-131

vim /etc/ hosts:

192.168.6.129 k8s-master
192.168.6.130 k8s-node-1
192.168.6.131 k8s-node-2

Modify the host name:

hostnamectl set-hostname k8s-master
hostnamectl set-hostname k8s-node-1
hostnamectl set-hostname k8s-node-2

2: Install docker version 1.12. The 1.13 that comes with the system has a small bug and needs to be modified, otherwise the subsequent container network communication will be blocked

[root@k8s-master ~]# yum provides docker
Loaded plugins: fastestmirror
Determining fastest mirrors
* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
2:docker-1.13.1-102.git7f2769b.el7.centos.x86_64 : Automates deployment of
: containerized applicat
Repo : extras
2:docker-1.13.1-103.git7f2769b.el7.centos.x86_64 : Automates deployment of
: containerized applications
Repo : extras
[root@k8s-master ~]#

Go to the official website to find version 1.12 docker

http://vault.centos.org/7.4.1708/extras/x86_64/Packages/

Need to install CentOS-Base.repo source in advance

All three machines need to download these three docker packages:

##http: //vault.centos.org/7.4.1708/extras/x86_64/Packages/docker-1.12.6-71.git3e8e77d.el7.centos.x86_64.rpm

http://vault.centos.org/7.4.1708/extras/x86_64/Packages/docker-client-1.12.6-71.git3e8e77d.el7.centos.x86_64.rpm

http://vault.centos.org/7.4.1708/extras/x86_64/Packages/docker-common-1.12.6-71.git3e8e77d.el7.centos.x86_64.rpm

[root@k8s-master ~]# ls
docker-1.12.6-71.git3e8e77d.el7.centos.x86_64.rpm
docker-client-1.12.6-71.git3e8e77d.el7.centos.x86_64.rpm
docker-common-1.12.6-71.git3e8e77d.el7.centos.x86_64.rpm
[root@k8s-master ~]# scp * 192.168.6.130:~
root@192.168.6.130's password:
docker-1.12.6-71.git3e8e77d.el7.centos.x86_64.rpm 100% 15MB 30.7MB/s 00:00
docker-client-1.12.6-71.git3e8e77d.el7.centos.x86_64.rpm 100% 3451KB 29.6MB/s 00:00
docker-common-1.12.6-71.git3e8e77d.el7.centos.x86_64.rpm 100% 83KB 6.9MB/s 00:00
[root@k8s-master ~]# scp * 192.168.6.131:~
root@192.168.6.131's password:
docker-1.12.6-71.git3e8e77d.el7.centos.x86_64.rpm 100% 15MB 24.2MB/s 00:00
docker-client-1.12.6-71.git3e8e77d.el7.centos.x86_64.rpm 100% 3451KB 23.3MB/s 00:00
docker-common-1.12.6-71.git3e8e77d.el7.centos.x86_64.rpm 100% 83KB 5.8MB/s 00:00
[root@k8s-master ~]#

Uninstall docker that has been installed on the system

Since the author has previously installed the docker-ce version, it needs to be completely uninstalled (it is recommended that you use a new machine to install)

[root@k8s-node-1 ~]# rpm -qa |grep docker
docker-ce-19.03.3-3.el7.x86_64
docker-ce-cli-19.03.3-3.el7.x86_64
[root@k8s-node-1 ~]# rpm -e docker-ce-19.03.3-3.el7.x86_64
[root@k8s-node-1 ~]# rpm -e docker-ce-cli-19.03.3-3.el7.x86_642
[root@k8s-node-1 ~]# rm -rf /var/lib/docker/* 清空之前docker产生的所有文件。
[root@k8s-node-1 ~]# rm -rf /etc/docker/*

3. Install docker 1.12 on all three machines (must be installed in the following order, otherwise an error may be reported)

yum localinstall docker-common-1.12.6-71.git3e8e77d.el7.centos.x86_64.rpm -y
yum localinstall docker-client-1.12.6-71.git3e8e77d.el7.centos.x86_64.rpm -y
yum localinstall docker-1.12.6-71.git3e8e77d.el7.centos.x86_64.rpm -y

4. Verify whether docker is installed successfully

[root@k8s-master ~]# docker -v
Docker version 1.12.6, build 3e8e77d/1.12.6

5. The master node installs etcd (k8s database kv type storage) natively supports clustering

[root@k8s-master ~]# yum install etcd.x86_64 -y
[root@k8s-master ~]# vim /etc/etcd/etcd.conf
ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"
ETCD_ADVERTISE_CLIENT_URLS="http://192.168.6.129:2379"
#启动
[root@k8s-master ~]# systemctl start etcd.service
[root@k8s-master ~]# systemctl enable etcd.service
#测试
#set 设置一队键值 数据存储
[root@k8s-master ~]# etcdctl set testdir/testkey0 xujin
Xujin
#get获取
[root@k8s-master ~]# etcdctl get testdir/testkey0
xujin
[root@k8s-master ~]#
#检测集群状态
[root@k8s-master ~]# etcdctl -C http://192.168.6.129:2379 cluster-health
member 8e9e05c52164694d is healthy: got healthy result from http://192.168.6.129:2379
cluster is healthy
[root@k8s-master ~]#

6. The master node installs kubernetes

[root@k8s-master ~]# yum install kubernetes-master.x86_64 -y
#修改配置文件如下
[root@k8s-master ~]# vim /etc/kubernetes/apiserver
# The address on the local server to listen to.
KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"
# The port on the local server to listen on.
KUBE_API_PORT="--port=8080"
# Port minions listen on
KUBELET_PORT="--kubelet-port=10250"
# Comma separated list of nodes in the etcd cluster
KUBE_ETCD_SERVERS="--etcd-servers=http://192.168.6.129:2379"
# default admission control policies
KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,Securi
tyContextDeny,ResourceQuota"
#修改config文件
[root@k8s-master ~]# vim /etc/kubernetes/config
KUBE_MASTER="--master=http://192.168.6.129:8080"

7. Start k8s

# 启动kube-apiserver
#这个服务用来：接受并响应用户的请求
[root@k8s-master ~]# systemctl enable kube-apiserver.service
[root@k8s-master ~]# systemctl start kube-apiserver.service
#启动 kube-controller-manager
#控制管理器的概念，保证容器存活
#每隔一段时间去扫描容器状态，看有没有死了。
#容器死了，会调度apiserver再起一个新的容器
#保证容器的个数，比如我们设定起三个nginx容器，多了就会杀掉，少了就会起
[root@k8s-master ~]# systemctl enable kube-controller-manager.service
[root@k8s-master ~]# systemctl start kube-controller-manager.service
#启动kube-scheduler
#调度器，选择启动容器的node节点，通俗点就是容器在哪一个节点服务器上面创建
[root@k8s-master ~]# systemctl enable kube-scheduler.service
[root@k8s-master ~]# systemctl start kube-scheduler.service

Now the master 129 k8s is installed.

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