字数统计: 789字

  |   阅读时长≈ 4分

Kubernetes安装及初始化

研发环境搭建Kubernetes All-in-One环境搭建。

CentOS 7初始化

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18

# Set SELinux in permissive mode (effectively disabling it)
setenforce 0
#sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
sed -i 's/^SELINUX=enforcing$/SELINUX=disabled/' /etc/selinux/config

systemctl stop NetworkManager
systemctl disable NetworkManager

systemctl status firewalld
systemctl stop firewalld
systemctl disable firewalld
systemctl status firewalld
firewall-cmd --state

curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
yum clean all && yum makecache
yum update -y

Docker国内源安装

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25

# Install Docker
curl -sSL https://get.daocloud.io/docker | sh -s -- "--mirror" "Aliyun"

# Replace docker repo
mkdir -p /etc/docker
cat > /etc/docker/daemon.json <<EOF
{
  "registry-mirrors": ["https://6m7d428u.mirror.aliyuncs.com"],
  "dns": ["114.114.114.114"],
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2",
  "storage-opts": [
    "overlay2.override_kernel_check=true"
  ]
}
EOF

systemctl enable docker && systemctl daemon-reload && systemctl restart docker

curl -L https://get.daocloud.io/docker/compose/releases/download/1.25.4/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose
chmod +x /usr/local/bin/docker-compose

安装Kubernetes软件

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27

# step1 Installation Process
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
exclude=kube*
EOF

yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes

systemctl enable kubelet

# for CentOS 7
cat <<EOF >  /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
vm.swappiness=0
EOF
sysctl --system

# from k8s 1.8, swap need to be cloased, otherwise k8s could not be started
# swapoff -a
# Modify /etc/fstab, comment swap mount

初始化Kubernetes集群

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21

# Step2 initialization
# Specify kubernetes-version if mirror do not contain latest kubernetes container. ex: if kubeadm is version 1.18.5, you can only
# install kubernetes = 1.18.x
kubeadm init --pod-network-cidr=10.244.0.0/16 --image-repository registry.aliyuncs.com/google_containers --kubernetes-version=1.18.0

# Response from output
# You should now deploy a pod network to the cluster.
# Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
#   https://kubernetes.io/docs/concepts/cluster-administration/addons/
# Then you can join any number of worker nodes by running the following on each as root:
# kubeadm join 192.168.10.111:6443 --token 1odaru.0by05advhbu7edgt \
#     --discovery-token-ca-cert-hash sha256:3efb71c40cce36c5ed90fc8b5831233aba06eec26576088e8e7a7a892d272776

# Step3 flannel Network
sysctl net.bridge.bridge-nf-call-iptables=1
kubectl apply -f https://gitee.com/xiaoquqi/flannel/raw/master/Documentation/kube-flannel.yml

# Step4 To use cluster
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

允许Master节点运行Pods

1

kubectl taint nodes --all node-role.kubernetes.io/master-

安装Wordpress和MySQL

1
2
3

curl -LO https://raw.githubusercontent.com/xiaoquqi/k8s_demo/master/wordpress/mysql-deployment.yaml
curl -LO https://raw.githubusercontent.com/xiaoquqi/k8s_demo/master/wordpress/wordpress-deployment.yaml
curl -LO https://raw.githubusercontent.com/xiaoquqi/k8s_demo/master/wordpress/kustomization.yaml

1

kubectl apply -k ./

1
2
3
4

kubectl get secrets
kubectl get pvc
kubectl get pods
kubectl get services wordpress

1

kubectl delete -k ./