Pod Controller of Kubernetes

Define common resources for pods pods.spec.containers

-Name <string> #containers names

Image <string> #镜像地址

Imagepullpolicy <string> #如果标签是latest is always (download image) Ifnotpresent (see if there is a local image, if not download) never (using local mirror)

Ports <[]Object> #是给对象列表 can expose multiple ports can be defined for each port's attribute definition such as: (The name (can be called later) port number protocol exposed to the address) exposed ports only provide additional information, can not limit the system is really exposed

-Containerport Container Port

HostIP host address (basic not used)

Hostport Node Port

Name names

Protocol (default is TCP)

Args <[]string> pass parameters to command equivalent to CMD in Docker

Command <[]string> equivalent to entrypoint (reference address) in Docker

• If the pod does not provide command or args using container, use cmd or entrypoint in the Docker image.

• if pod provides command but not provided args , use only the provided command the. entrypoint and cmd are defined in the Docker image will be ignored.

• If the pod only provides args , it args will be supplied as a parameter to the Docker image entrypoint .
• If you provide a command and the args , the entrypoint and cmd in the Docker image will not take effect,and thepod args will be used as a parameter to command运行 .

Label

Key=value

• Key: Use only alphanumeric _-. (can only start with an alphanumeric character, not more than 63 characters)
• Value: Can be empty only with alpha-numeric start

#显示标签 $ kubectl Get pods--show-Labelsname Ready STATUS restarts age LABELSJDK-94bcfc779-fs2cl1/1Running08d pod-template-hash=506797335, workload.user.cattle.io/workloadselector=deployment-default-Jdkmysql-5ffdf958d9-7qdnv1/1Running13d pod-template-hash=1998951485, workload.user.cattle.io/workloadselector=deployment-default-mysql#-L show pod with app tag and print value under App tab $ kubectl get pods--all-namespaces-L appnamespace NAME ready STATUS restarts age appcattle< /c4>-alerting alertmanager-649c5fc4d7-4hp9q2/2Running01d Alertmanagercattle-system CATTLE-CLUSTER-AGENT-6D7C847588-F6CMT1/1Running228d cattle-cluster-Agentcattle-system Cattle-node-agent-9m2ls1/1Running228d cattle-Agentcattle-system CATTLE-NODE-AGENT-9NGFH1/1Running012d cattle-Agentcattle-system cattle-node-agent-j862c1/1Running112d cattle-Agentcattle-system CATTLE-NODE-AGENT-S8S751/1Running112d cattle-agent#-L Filter Those pods with app tag $ kubectl get pods--all-namespaces-l appnamespace NAME ready STATUS restarts Agecattle-alerting alertmanager-649c5fc4d7-4hp9q2/2Running01dcattle-system CATTLE-CLUSTER-AGENT-6D7C847588-F6CMT1/1Running228dcattle-system Cattle-node-agent-9m2ls1/1Running228dcattle-system CATTLE-NODE-AGENT-9NGFH1/1Running012d# hit label $ kubectl label pod JDK-94bcfc779-fs2cl app=dev# Modifying Labels--overwrite$ kubectl label pod JDK-94bcfc779-fs2cl app=test--overwrite

Tag Selector

• Equivalent relationship Tag Selector: =, = =,! = (Kubectl get pods-l App=test,app=dev)
• Collection Relationship Tag Selector: Key in (V1,V2,V3), key notin (V1,V2,V3)! KEY (Kubectl get Pods-l "app in (Test,dev)")

Many resources support inline fields

• Matchlabels: Directly given a built-in value
• Matchexpressions: Defines the use of a tag selector based on the given expression {key: "key", Operator: "operator", Values:[v1,v2,....]}
• Operator: The value of the in notin:values field must be a non-empty list Exists The value of notexists:values field must be an empty list

Node Selector

Nodeselector <object>

Annotations to annotations resources in meta-data

Annotations <object> Unlike labels, he cannot pick a resource object, only to provide metadata for the object

Pod Controller of Kubernetes