cppla带你玩k8s之一（快速配置kubernets集群）

集群

[初始化配置节点]

• master1 157.230.148.56
• node1 157.230.145.228

[动态添加节点]

• node2 157.230.176.176

注意

k8s设计出于性能的考虑，不使用swap 分区， “swapoff -a” or “echo “vm.swappiness = 0″>> /etc/sysctl.conf”

安装依赖环境

apt install python-pip -y
apt install git -y
pip install ansible
pip install netaddr
pip install Jinja2

配置密钥互通

# 一、node A(master):

ssh-keygen -t rsa
 
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

# 二、node B:

# 上传密钥到node B
# scp ~/.ssh/id_rsa.pub root@node B:/root/.ssh
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

# 三、ssh互通测试

ssh root@node B

kubernetes集群配置

# 一、下载kubernetes

git clone https://github.com/kubernetes-sigs/kubespray
cd kubespray
pip install -r requirements.txt
cp -r inventory/sample inventory/cppla

# 二、初始化inventory文件

declare -a IPS=(157.230.148.56 157.230.145.228)
CONFIG_FILE=inventory/cppla/hosts.ini python3 contrib/inventory_builder/inventory.py ${IPS[@]}

# 三、调整集群配置cppla/hosts.ini

[all]
node1 	 ansible_host=157.230.148.56 ip=157.230.148.56
node2 	 ansible_host=157.230.145.228 ip=157.230.145.228
 
[kube-master]
node1 	 
 
[etcd]
node1 	 
 
[kube-node]
node2 
 
[k8s-cluster:children]
kube-master 	 
kube-node 	 
 
[calico-rr]

启动kubernetes集群

ansible-playbook -i inventory/cppla/hosts.ini cluster.yml

动态添加kubernetes节点

# 一、新节点添加密钥互通

cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

# 二、调整集群配置cppla/hosts.ini

[all]
node1 	 ansible_host=157.230.148.56 ip=157.230.148.56
node2 	 ansible_host=157.230.145.228 ip=157.230.145.228
node3 	 ansible_host=157.230.176.176 ip=157.230.176.176
 
[kube-master]
node1 	 
 
[etcd]
node1 	 
 
[kube-node]
node2
node3	 
 
[k8s-cluster:children]
kube-master 	 
kube-node 	 
 
[calico-rr]

# 三、执行命令

ansible-playbook -i inventory/cppla/hosts.ini scale.yml

验证kubernetes集群是否成功

# kubectl get node
NAME    STATUS   ROLES    AGE   VERSION
node1   Ready    master   32m   v1.13.2
node2   Ready    node     32m   v1.13.2
node3   Ready    node     65s   v1.13.2

以上测试on DigitalOcean Cloud Computing ,  time:20190121, by:cpp.la