|NO.Z.00147|——————————|CloudNative|——|KuberNetes&资源调度.V17|——|daemonset.v02|创建到特定主机|

一、将daemonset部署到符合条件的宿主机上

### --- 为符合条件的宿主机打标签
~~~     为所有node节点搭上标签
~~~     只需要在node节点上部署ds，忽略master节点。需要给node节点打个标签，

[root@k8s-master01 ~]# kubectl label node k8s-node01 k8s-node02 ds=true
node/k8s-node01 labeled
node/k8s-node02 labeled

### --- 查看所有节点的标签信息

[root@k8s-master01 ~]# kubectl get node --show-labels
NAME           STATUS   ROLES    AGE   VERSION   LABELS
k8s-master01   Ready    <none>   9d    v1.20.0   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-master01,kubernetes.io/os=linux,node.kubernetes.io/node=
k8s-master02   Ready    <none>   9d    v1.20.0   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-master02,kubernetes.io/os=linux,node.kubernetes.io/node=
k8s-master03   Ready    <none>   9d    v1.20.0   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-master03,kubernetes.io/os=linux,node.kubernetes.io/node=
k8s-node01     Ready    <none>   9d    v1.20.0   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,ds=true,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-node01,kubernetes.io/os=linux,node.kubernetes.io/node=
k8s-node02     Ready    <none>   9d    v1.20.0   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,ds=true,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-node02,kubernetes.io/os=linux,node.kubernetes.io/node=

二、更改daemonset配置文件参数

### --- 更改一下DaemonSet

[root@k8s-master01 ~]# kubectl edit ds
    spec:
      nodeSelector:                                                                 //nodeSelector和containers是平级的，
        ds: "true"
      containers:
      - image: nginx:1.15.2
        imagePullPolicy: IfNotPresent
        name: nginx
        resources: {}
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File

三、重新触发容器

### --- 重新触发容器，查看pod状态
~~~     不符合这个标签的pod会被删除掉

[root@k8s-master01 ~]# kubectl get po
NAME          READY   STATUS        RESTARTS   AGE
nginx-7lgnx   1/1     Running       0          6m24s
nginx-l9dkp   0/1     Running       0          6m24s
nginx-ps42t   1/1     Terminating   0          6m24s
nginx-v6687   1/1     Terminating   0          6m24s
nginx-zb474   1/1     Terminating   0          6m24s

### --- 查看更改配置后容器状态
~~~     删除的过程中，会做一次更新，因为DaemonSet是在线编译的，会产生之前的一个版本记录。
 
NAME          READY   STATUS    RESTARTS   AGE    IP              NODE         NOMINATED NODE   READINESS GATES
nginx-n47b7   1/1     Running   0          68s    172.17.125.2    k8s-node01   <none>           <none>
nginx-tsxcp   1/1     Running   0          2m8s   172.27.14.194   k8s-node02   <none> 

四、查看pod的历史版本

### --- 通过rollout查看pod构建历史版本

[root@k8s-master01 ~]# kubectl rollout history ds nginx                             //可以查看到之前的记录。
daemonset.apps/nginx 
REVISION  CHANGE-CAUSE
1         <none>
2         <none>

五、新添加一个pod到指定的宿主机上

### --- 新添加一个节点；在master03上

[root@k8s-master01 ~]# kubectl label node k8s-master03 ds=true
node/k8s-master03 labeled

### --- 查看pod创建结果
 
[root@k8s-master01 ~]# kubectl get po -owide
NAME          READY   STATUS    RESTARTS   AGE     IP              NODE           NOMINATED NODE   READINESS GATES
nginx-n47b7   1/1     Running   0          3m40s   172.17.125.2    k8s-node01     <none>           <none>
nginx-tsxcp   1/1     Running   0          4m40s   172.27.14.194   k8s-node02     <none>           <none>
nginx-wfrpz   1/1     Running   0          10s     172.18.195.8    k8s-master03   <none>   

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart

                                                                                                                                                   ——W.S.Landor

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