【目录】
(1)k8s快速介绍
(2)硬件虚拟机环境Ubuntu18.10-server安装
(3)Docker-CE安装及配置
(4)Kubernetes 安装及部署
(5)创建企业Kubernetes多主机集群环境
(6)Kubernetes集群mysql应用实例
(7)Kubernetes集群tomcat应用集群实例
(8)Kubernetes集群beego新闻发布web系统集群实例
【资源下载】
完整教程markdown下载 提取码: 92hy
kubernetes(k8s)2小时快速部署教程视频 提取码:dk4i
kubernetes-Master-Node虚拟机完整镜像文件 提取码: 2wf8
课程相关其他相关安装包及镜像 提取码: nkfj
六、应用实例
6.1 创建MySQL实例
6.1.1 定义描述文件
apiVersion: v1
kind: ReplicationController #副本控制器RC
metadata:
name: mysql #RC的名称，全局唯一
spec:
replicas: 1 #Pod副本的期待数量
selector:
app: mysql #符合目标的Pod拥有此标签
template: #根据此模板创建Pod的副本（实例）
metadata:
labels:
app: mysql #Pod副本拥有的标签，对应RC的Selector
spec:
containers: #Pod内容器的定义部分
- name: mysql #容器的名称
image: hub.c.163.com/library/mysql #容器对应的Docker image
ports:
- containerPort: 3306 #容器应用监听的端口号
env: #注入容器内的环境变量
- name: MYSQL_ROOT_PASSWORD
value: "123456"
6.1.2 加载ReplicationController副本控制器描述文件
创建好mysql-rc.yaml后，在master节点使用kubectl命令将它发布到k8s集群中。
kubectl create -f mysql-rc.yaml
6.1.3 查看启动状态
通过查看当前的pods列表，是否已经启动成功:
6.1.4 网络异常解决方案(未出现问题可直接跳过)
注意：如果这里出现了ContainerCreating状态，那么可以尝试如下解决办法:
itcast@master:~/working$ kubectl get pods
NAME READY STATUS RESTARTS AGE
mysql-tscrh 0/1 ContainerCreating 0 17m
目前mysql-tscrh 描述文件 已经创建，但是没有启动成功. 状态是ContainerCreating 没有启动起来.
通过kubectl describe pods来查看pods的详细状态
itcast@master:~/working$ kubectl describe pods mysql
Name: mysql-tscrh
Namespace: default
Priority: 0
PriorityClassName: <none>
Node: node1/192.168.236.178
Start Time: Mon, 17 Jun 2019 09:10:35 +0000
Labels: app=mysql
Annotations: <none>
Status: Pending
IP:
Controlled By: ReplicationController/mysql
Containers:
mysql:
Container ID:
Image: hub.c.163.com/library/mysql
Image ID:
Port: 3306/TCP
Host Port: 0/TCP
State: Waiting
Reason: ContainerCreating
Ready: False
Restart Count: 0
Environment:
MYSQL_ROOT_PASSWORD: 123456
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-q6ggq (ro)
Conditions:
Type Status
Initialized True
Ready False
ContainersReady False
PodScheduled True
Volumes:
default-token-q6ggq:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-q6ggq
Optional: false
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute for 300s
node.kubernetes.io/unreachable:NoExecute for 300s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 22m default-scheduler Successfully assigned default/mysql-tscrh to node1
Warning FailedCreatePodSandBox 22m kubelet, node1 Failed create pod sandbox: rpc error: code = Unknown desc = failed to set up sandbox container "58d143373e767c40610587624c667d8e20dd77fa397952406a085f2ae1dc38e6" network for pod "mysql-tscrh": NetworkPlugin cni failed to set up pod "mysql-tscrh_default" network: open /run/flannel/subnet.env: no such file or directory
Warning FailedCreatePodSandBox 22m kubelet, node1 Failed create pod sandbox: rpc error: code = Unknown desc = failed to set up sandbox container "81d12726dbe075c64af48142638e98863231e8201ccc292f0dda1fccfa7fdaec" network for pod "mysql-tscrh": NetworkPlugin cni failed to set up pod "mysql-tscrh_default" network: open /run/flannel/subnet.env: no such file or directory
Warning FailedCreatePodSandBox 22m kubelet, node1 Failed create pod sandbox: rpc error: code = Unknown desc = failed to set up sandbox container "8bd77ee0176d369435ead7bd3c2675b7bbcbdc2b052cf34c784f04053a7d5288" network for pod "mysql-tscrh": NetworkPlugin cni failed to set up pod "mysql-tscrh_default" network: open /run/flannel/subnet.env: no such file or directory
Warning FailedCreatePodSandBox 22m kubelet, node1 Failed create pod sandbox: rpc error: code = Unknown desc = failed to set up sandbox container "0733fc209e085e96f5823a2280b012a609dace41fda967c5ae951005a8699ce6" network for pod "mysql-tscrh": NetworkPlugin cni failed to set up pod "mysql-tscrh_default" network: open /run/flannel/subnet.env: no such file or directory
Warning FailedCreatePodSandBox 22m kubelet, node1 Failed create pod sandbox: rpc error: code = Unknown desc = failed to set up sandbox container "91f337eb334612b2e7426d820ba4b15a9c9c549050517d459508832b69780b5f" network for pod "mysql-tscrh": NetworkPlugin cni failed to set up pod "mysql-tscrh_default" network: open /run/flannel/subnet.env: no such file or directory
Warning FailedCreatePodSandBox 22m kubelet, node1 Failed create pod sandbox: rpc error: code = Unknown desc = failed to set up sandbox container "48cbba9896068a774d9128a6864394e8726a0d857bae61036421ad73f5d6e3dd" network for pod "mysql-tscrh": NetworkPlugin cni failed to set up pod "mysql-tscrh_default" network: open /run/flannel/subnet.env: no such file or directory
Warning FailedCreatePodSandBox 22m kubelet, node1 Failed create pod sandbox: rpc error: code = Unknown desc = failed to set up sandbox container "d259778aa19418a9a429b3175b66afae3d8ffb7324ec9df492b2947dbc153460" network for pod "mysql-tscrh": NetworkPlugin cni failed to set up pod "mysql-tscrh_default" network: open /run/flannel/subnet.env: no such file or directory
Warning FailedCreatePodSandBox 22m kubelet, node1 Failed create pod sandbox: rpc error: code = Unknown desc = failed to set up sandbox container "3d01c00ac9eaac7b2e983402be38c1cf60c4bbd1d454aa45329ce0ca0c2bf792" network for pod "mysql-tscrh": NetworkPlugin cni failed to set up pod "mysql-tscrh_default" network: open /run/flannel/subnet.env: no such file or directory
Warning FailedCreatePodSandBox 22m kubelet, node1 Failed create pod sandbox: rpc error: code = Unknown desc = failed to set up sandbox container "98879cbb0405dac3a24753dd1986070a53fe9ee9f1b819996a903c19286a2bb7" network for pod "mysql-tscrh": NetworkPlugin cni failed to set up pod "mysql-tscrh_default" network: open /run/flannel/subnet.env: no such file or directory
Warning FailedCreatePodSandBox 7m49s (x838 over 22m) kubelet, node1 (combined from similar events): Failed create pod sandbox: rpc error: code = Unknown desc = failed to set up sandbox container "60923335b41c2d0412b279bdb6150f9b9b7eae20c4a02549e35509083c01384b" network for pod "mysql-tscrh": NetworkPlugin cni failed to set up pod "mysql-tscrh_default" network: open /run/flannel/subnet.env: no such file or directory
Normal SandboxChanged 2m49s (x1127 over 22m) kubelet, node1 Pod sandbox changed, it will be killed and re-created.
会看到一个错误:
"mysql-tscrh": NetworkPlugin cni failed to set up pod "mysql-tscrh_default" network: open /run/flannel/subnet.env: no such file or directory
这是缺少/run/flannel/subnet.env文件
解决办法：配置flannel网络
分别在三台服务器上执行如下步骤
-
创建目录
sudo mkdir -p /run/flannel -
创建环境描述文件
$ sudo tee /run/flannel/subnet.env <<-'EOF' FLANNEL_NETWORK=10.244.0.0/16 FLANNEL_SUBNET=10.244.0.1/24 FLANNEL_MTU=1450 FLANNEL_IPMASQ=true EOF
6.1.5 查看mysql实例集群状态
itcast@master:~/working$ kubectl get pods
NAME READY STATUS RESTARTS AGE
mysql-tscrh 0/1 Running 0 17m
如果为Running状态，则为mysql集群启动成功。
关于作者：
作者：Aceld(刘丹冰)
简书号：IT无崖子
mail: danbing.at@gmail.com
github: https://github.com/aceld
原创书籍gitbook: http://legacy.gitbook.com/@aceld
原创声明:未经作者允许请勿转载, 如果转载请注明出处
