实战生产环境：最新K8sAnnotations详解

本篇文章，所使用的任何镜像我都会发一个网盘链接，供大家下载学习！

yaml 请到我的github上下载学习！

github：https://github.com/heyangguang

有任何问题可以直接联系我的Email：heyangev@cn.ibm.com

https://kubernetes.io/docs/co&＃8230;

顾名思义，就是注释的意思。有两个功能：

• 注释性信息，不影响调度
• 工具和库等客户端可以检索Annotation数据

[root@master01 ~]# kubectl describe nodes node01
Name: node01
Roles: work
Labels: beta.kubernetes.io/arch=amd64
beta.kubernetes.io/os=linux
kubernetes.io/arch=amd64
kubernetes.io/hostname=node01
kubernetes.io/os=linux
node-role.kubernetes.io/work=
Annotations: kubeadm.alpha.kubernetes.io/cri-socket: /var/run/dockershim.sock
node.alpha.kubernetes.io/ttl: 0
projectcalico.org/IPv4Address: 172.20.102.221/20
projectcalico.org/IPv4IPIPTunnelAddr: 192.168.196.128
volumes.kubernetes.io/controller-managed-attach-detach: true
CreationTimestamp: Sat, 10 Aug 2019 12:42:08 +0800
Taints:
Unschedulable: false
Conditions:
Type Status LastHeartbeatTime LastTransitionTime Reason Message
---- ------ ----------------- ------------------ ------ -------
NetworkUnavailable False Sat, 10 Aug 2019 12:42:54 +0800 Sat, 10 Aug 2019 12:42:54 +0800 CalicoIsUp Calico is running on this node
MemoryPressure False Sun, 11 Aug 2019 00:01:21 +0800 Sat, 10 Aug 2019 12:42:08 +0800 KubeletHasSufficientMemory kubelet has sufficient memory available
DiskPressure False Sun, 11 Aug 2019 00:01:21 +0800 Sat, 10 Aug 2019 12:42:08 +0800 KubeletHasNoDiskPressure kubelet has no disk pressure
PIDPressure False Sun, 11 Aug 2019 00:01:21 +0800 Sat, 10 Aug 2019 12:42:08 +0800 KubeletHasSufficientPID kubelet has sufficient PID available
Ready True Sun, 11 Aug 2019 00:01:21 +0800 Sat, 10 Aug 2019 12:42:28 +0800 KubeletReady kubelet is posting ready status
Addresses:
InternalIP: 172.20.102.221
Hostname: node01
Capacity:
cpu: 2
ephemeral-storage: 41147472Ki
hugepages-1Gi: 0
hugepages-2Mi: 0
memory: 8009180Ki
pods: 110
Allocatable:
cpu: 2
ephemeral-storage: 37921510133
hugepages-1Gi: 0
hugepages-2Mi: 0
memory: 7906780Ki
pods: 110
System Info:
Machine ID: 20190711105006363114529432776998
System UUID: 7ABFD479-B967-4A73-9D8A-5E0993B76A2D
Boot ID: f61e9e10-1864-4610-a98c-c8c9924bd8e9
Kernel Version: 3.10.0-957.21.3.el7.x86_64
OS Image: CentOS Linux 7 (Core)
Operating System: linux
Architecture: amd64
Container Runtime Version: docker://18.6.2
Kubelet Version: v1.15.2
Kube-Proxy Version: v1.15.2
PodCIDR: 192.168.1.0/24
Non-terminated Pods: (3 in total)
Namespace Name CPU Requests CPU Limits Memory Requests Memory Limits AGE
--------- ---- ------------ ---------- --------------- ------------- ---
default label-demo 0 (0%) 0 (0%) 0 (0%) 0 (0%) 16m
kube-system calico-node-nsjfq 250m (12%) 0 (0%) 0 (0%) 0 (0%) 11h
kube-system kube-proxy-dd78n 0 (0%) 0 (0%) 0 (0%) 0 (0%) 11h
Allocated resources:
(Total limits may be over 100 percent, i.e., overcommitted.)
Resource Requests Limits
-------- -------- ------
cpu 250m (12%) 0 (0%)
memory 0 (0%) 0 (0%)
ephemeral-storage 0 (0%) 0 (0%)
Events: 创建Annotations

1、命令行创建

[root@master01 ~]# kubectl annotate nodes node01 test_people=heyang
node/node01 annotated
[root@master01 ~]# kubectl describe nodes node01
Name: node01
Roles: work
Labels: beta.kubernetes.io/arch=amd64
beta.kubernetes.io/os=linux
kubernetes.io/arch=amd64
kubernetes.io/hostname=node01
kubernetes.io/os=linux
node-role.kubernetes.io/work=
Annotations: kubeadm.alpha.kubernetes.io/cri-socket: /var/run/dockershim.sock
node.alpha.kubernetes.io/ttl: 0
projectcalico.org/IPv4Address: 172.20.102.221/20
projectcalico.org/IPv4IPIPTunnelAddr: 192.168.196.128
test_people: heyang
volumes.kubernetes.io/controller-managed-attach-detach: true
CreationTimestamp: Sat, 10 Aug 2019 12:42:08 +0800
Taints:
Unschedulable: false
Conditions:
Type Status LastHeartbeatTime LastTransitionTime Reason Message
---- ------ ----------------- ------------------ ------ -------
NetworkUnavailable False Sat, 10 Aug 2019 12:42:54 +0800 Sat, 10 Aug 2019 12:42:54 +0800 CalicoIsUp Calico is running on this node
MemoryPressure False Sun, 11 Aug 2019 00:03:21 +0800 Sat, 10 Aug 2019 12:42:08 +0800 KubeletHasSufficientMemory kubelet has sufficient memory available
DiskPressure False Sun, 11 Aug 2019 00:03:21 +0800 Sat, 10 Aug 2019 12:42:08 +0800 KubeletHasNoDiskPressure kubelet has no disk pressure
PIDPressure False Sun, 11 Aug 2019 00:03:21 +0800 Sat, 10 Aug 2019 12:42:08 +0800 KubeletHasSufficientPID kubelet has sufficient PID available
Ready True Sun, 11 Aug 2019 00:03:21 +0800 Sat, 10 Aug 2019 12:42:28 +0800 KubeletReady kubelet is posting ready status
Addresses:
InternalIP: 172.20.102.221
Hostname: node01
Capacity:
cpu: 2
ephemeral-storage: 41147472Ki
hugepages-1Gi: 0
hugepages-2Mi: 0
memory: 8009180Ki
pods: 110
Allocatable:
cpu: 2
ephemeral-storage: 37921510133
hugepages-1Gi: 0
hugepages-2Mi: 0
memory: 7906780Ki
pods: 110
System Info:
Machine ID: 20190711105006363114529432776998
System UUID: 7ABFD479-B967-4A73-9D8A-5E0993B76A2D
Boot ID: f61e9e10-1864-4610-a98c-c8c9924bd8e9
Kernel Version: 3.10.0-957.21.3.el7.x86_64
OS Image: CentOS Linux 7 (Core)
Operating System: linux
Architecture: amd64
Container Runtime Version: docker://18.6.2
Kubelet Version: v1.15.2
Kube-Proxy Version: v1.15.2
PodCIDR: 192.168.1.0/24
Non-terminated Pods: (3 in total)
Namespace Name CPU Requests CPU Limits Memory Requests Memory Limits AGE
--------- ---- ------------ ---------- --------------- ------------- ---
default label-demo 0 (0%) 0 (0%) 0 (0%) 0 (0%) 19m
kube-system calico-node-nsjfq 250m (12%) 0 (0%) 0 (0%) 0 (0%) 11h
kube-system kube-proxy-dd78n 0 (0%) 0 (0%) 0 (0%) 0 (0%) 11h
Allocated resources:
(Total limits may be over 100 percent, i.e., overcommitted.)
Resource Requests Limits
-------- -------- ------
cpu 250m (12%) 0 (0%)
memory 0 (0%) 0 (0%)
ephemeral-storage 0 (0%) 0 (0%)
Events:

2、yaml创建

[root@master01 ~]# touch pod-annotations.yaml
[root@master01 ~]# vim pod-annotations.yaml
[root@master01 ~]# cat pod-annotations.yaml
apiVersion: v1
kind: Pod
metadata:
name: annotations-demo
annotations:
imageregistry: "https://hub.docker.com/"
spec:
containers:
- name: nginx
image: nginx:1.7.9
ports:
- containerPort: 80
[root@master01 ~]# kubectl apply -f pod-annotations.yaml
pod/annotations-demo created
[root@master01 ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
annotations-demo 0/1 ContainerCreating 0 7s
label-demo 1/1 Running 0 21m
[root@master01 ~]# kubectl describe pods annotations-demo
Name: annotations-demo
Namespace: default
Priority: 0
Node: node02/172.20.102.220
Start Time: Sun, 11 Aug 2019 00:05:46 +0800
Labels:
Annotations: cni.projectcalico.org/podIP: 192.168.140.65/32
imageregistry: https://hub.docker.com/
kubectl.kubernetes.io/last-applied-configuration:
{"apiVersion":"v1","kind":"Pod","metadata":{"annotations":{"imageregistry":"https://hub.docker.com/"},"name":"annotations-demo","namespace...
Status: Running
IP: 192.168.140.65
Containers:
nginx:
Container ID: docker://8fbbd1b6a180a55442301cc7113da92ddb74c34b13db670b27944137f13708fc
Image: nginx:1.7.9
Image ID: docker-pullable://nginx@sha256:e3456c851a152494c3e4ff5fcc26f240206abac0c9d794affb40e0714846c451
Port: 80/TCP
Host Port: 0/TCP
State: Running
Started: Sun, 11 Aug 2019 00:05:54 +0800
Ready: True
Restart Count: 0
Environment:
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-zh752 (ro)
Conditions:
Type Status
Initialized True
Ready True
ContainersReady True
PodScheduled True
Volumes:
default-token-zh752:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-zh752
Optional: false
QoS Class: BestEffort
Node-Selectors:
Tolerations: node.kubernetes.io/not-ready:NoExecute for 300s
node.kubernetes.io/unreachable:NoExecute for 300s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 19s default-scheduler Successfully assigned default/annotations-demo to node02
Normal Pulling 18s kubelet, node02 Pulling image "nginx:1.7.9"
Normal Pulled 11s kubelet, node02 Successfully pulled image "nginx:1.7.9"
Normal Created 11s kubelet, node02 Created container nginx
Normal Started 11s kubelet, node02 Started container nginx删除Annotations

[root@master01 ~]# kubectl annotate nodes node01 test_people-
node/node01 annotated
[root@master01 ~]# kubectl describe nodes node01
Name: node01
Roles: work
Labels: beta.kubernetes.io/arch=amd64
beta.kubernetes.io/os=linux
kubernetes.io/arch=amd64
kubernetes.io/hostname=node01
kubernetes.io/os=linux
node-role.kubernetes.io/work=
Annotations: kubeadm.alpha.kubernetes.io/cri-socket: /var/run/dockershim.sock
node.alpha.kubernetes.io/ttl: 0
projectcalico.org/IPv4Address: 172.20.102.221/20
projectcalico.org/IPv4IPIPTunnelAddr: 192.168.196.128
volumes.kubernetes.io/controller-managed-attach-detach: true
CreationTimestamp: Sat, 10 Aug 2019 12:42:08 +0800
Taints:
Unschedulable: false
Conditions:
Type Status LastHeartbeatTime LastTransitionTime Reason Message
---- ------ ----------------- ------------------ ------ -------
NetworkUnavailable False Sat, 10 Aug 2019 12:42:54 +0800 Sat, 10 Aug 2019 12:42:54 +0800 CalicoIsUp Calico is running on this node
MemoryPressure False Sun, 11 Aug 2019 00:07:21 +0800 Sat, 10 Aug 2019 12:42:08 +0800 KubeletHasSufficientMemory kubelet has sufficient memory available
DiskPressure False Sun, 11 Aug 2019 00:07:21 +0800 Sat, 10 Aug 2019 12:42:08 +0800 KubeletHasNoDiskPressure kubelet has no disk pressure
PIDPressure False Sun, 11 Aug 2019 00:07:21 +0800 Sat, 10 Aug 2019 12:42:08 +0800 KubeletHasSufficientPID kubelet has sufficient PID available
Ready True Sun, 11 Aug 2019 00:07:21 +0800 Sat, 10 Aug 2019 12:42:28 +0800 KubeletReady kubelet is posting ready status
Addresses:
InternalIP: 172.20.102.221
Hostname: node01
Capacity:
cpu: 2
ephemeral-storage: 41147472Ki
hugepages-1Gi: 0
hugepages-2Mi: 0
memory: 8009180Ki
pods: 110
Allocatable:
cpu: 2
ephemeral-storage: 37921510133
hugepages-1Gi: 0
hugepages-2Mi: 0
memory: 7906780Ki
pods: 110
System Info:
Machine ID: 20190711105006363114529432776998
System UUID: 7ABFD479-B967-4A73-9D8A-5E0993B76A2D
Boot ID: f61e9e10-1864-4610-a98c-c8c9924bd8e9
Kernel Version: 3.10.0-957.21.3.el7.x86_64
OS Image: CentOS Linux 7 (Core)
Operating System: linux
Architecture: amd64
Container Runtime Version: docker://18.6.2
Kubelet Version: v1.15.2
Kube-Proxy Version: v1.15.2
PodCIDR: 192.168.1.0/24
Non-terminated Pods: (3 in total)
Namespace Name CPU Requests CPU Limits Memory Requests Memory Limits AGE
--------- ---- ------------ ---------- --------------- ------------- ---
default label-demo 0 (0%) 0 (0%) 0 (0%) 0 (0%) 23m
kube-system calico-node-nsjfq 250m (12%) 0 (0%) 0 (0%) 0 (0%) 11h
kube-system kube-proxy-dd78n 0 (0%) 0 (0%) 0 (0%) 0 (0%) 11h
Allocated resources:
(Total limits may be over 100 percent, i.e., overcommitted.)
Resource Requests Limits
-------- -------- ------
cpu 250m (12%) 0 (0%)
memory 0 (0%) 0 (0%)
ephemeral-storage 0 (0%) 0 (0%)
Events: