参考文章：k8s基本概念-配置调度策略之(Taints-and-Tolerations)
https://blog.51cto.com/nosmoking/2097380
问题现象：新创建的rc，查看对应的pod一直处于Pending状态
[root@master contos7文件]# kubectl get pods
NAME READY STATUS RESTARTS AGE
mysql-phrqz 1/1 Running 0 30m
myweb-qvjr4 0/1 Pending 0 29s
查看详情发现：1 node(s) had taints that the pod didn't tolerate.
===>Tolerations: node.kubernetes.io/not-ready:NoExecute for 300s
===>node.kubernetes.io/unreachable:NoExecute for 300s
[root@master contos7文件]# kubectl describe pod myweb-qvjr4
Name: myweb-qvjr4
Namespace: default
Priority: 0
PriorityClassName: <none>
Node: <none>
Labels: app=myweb
Annotations: <none>
Status: Pending
IP:
Controlled By: ReplicationController/myweb
Containers:
myweb:
Image: docker.io/kubeguide/tomcat-app:v1
Port: 8080/TCP
Host Port: 0/TCP
Environment:
MYSQL_SERVICE_HOST: mysql
MYSQL_SERVICE_PORT: 3306
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-8sqth (ro)
Conditions:
Type Status
PodScheduled False
Volumes:
default-token-8sqth:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-8sqth
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
---- ------ ---- ---- -------
Warning FailedScheduling 41s (x3 over 51s) default-scheduler 0/1 nodes are available: 1 node(s) had taints that the pod didn't tolerate.
查看yaml文件：
[root@master contos7文件]# cat myweb-rc.yaml
apiVersion: v1
kind: ReplicationController
metadata:
name: myweb
spec:
replicas: 1 #在这里选择配置成了1个副本
selector:
app: myweb
template:
metadata:
labels:
app: myweb
spec:
containers:
- name: myweb
image: docker.io/kubeguide/tomcat-app:v1
ports:
- containerPort: 8080
env:
- name: MYSQL_SERVICE_HOST #value: '节点内IP'
value: 'mysql'
- name: MYSQL_SERVICE_PORT
value: '3306'
对yaml文件进行修改，添加一个tolerations解决node上的taints
[root@master contos7文件]# cat myweb-rc.yaml
apiVersion: v1
kind: ReplicationController
metadata:
name: myweb
spec:
replicas: 1 #在这里选择配置成了1个副本
selector:
app: myweb
template:
metadata:
labels:
app: myweb
spec:
containers:
- name: myweb
image: docker.io/kubeguide/tomcat-app:v1
ports:
- containerPort: 8080
env:
- name: MYSQL_SERVICE_HOST #value: '节点内IP'
value: 'mysql'
- name: MYSQL_SERVICE_PORT
value: '3306'
tolerations:
- key: "node-role.kubernetes.io/master"
operator: "Equal"
value: ""
effect: "NoSchedule"
删除之前未成功启动的rc，重新执行新的yaml文件并查看pod状态，已经运行了
[root@master shenqh]# kubectl get pods
NAME READY STATUS RESTARTS AGE
mysql-phrqz 1/1 Running 0 4h23m
myweb-2vkh2 1/1 Running 0 3h33m
