Monitoring of Weave Scope in k8s

Monitoring cluster with Weave Scope

Creating a kubernetes cluster and deploying containerized applications is just the first step. Once the cluster is running, we need to ensure that all necessary components are in place and perform their duties together, and that there are enough resources to meet the application requirements. Kubernetes is a complex system. The operation and maintenance team needs a set of tools to help them know the real-time status of the cluster and provide timely and accurate data support for troubleshooting.

Kubernetes common monitoring scheme

Weave Scope

Weave Scope is a visualized monitoring tool for Docker and Kubernetes. Scope provides a complete view of the cluster infrastructure and applications from the top to the bottom. Users can easily monitor and diagnose the distributed containerized applications in real time.

Install Scope

The method to install Scope is simple. Execute the following command:

kubectl apply -f "https://cloud.weave.works/k8s/scope.yaml?k8s-version=$(kubectl version | base64 | tr -d '\n')&k8s-service-type=NodePort"
After successful deployment, there are the following related components:

[root@k8s-master ~]# kubectl apply -f "https://cloud.weave.works/k8s/scope.yaml?k8s-version=$(kubectl version | base64 | tr -d '\n')&k8s-service-type=NodePort"
namespace/weave unchanged
serviceaccount/weave-scope created
clusterrole.rbac.authorization.k8s.io/weave-scope configured
clusterrolebinding.rbac.authorization.k8s.io/weave-scope configured
deployment.apps/weave-scope-app created
service/weave-scope-app created
deployment.apps/weave-scope-cluster-agent created
daemonset.apps/weave-scope-agent created
[root@k8s-master ~]# kubectl get pod -n weave
NAME                                         READY   STATUS              RESTARTS   AGE
weave-scope-agent-bct26                      1/1     Running             0          30s
weave-scope-agent-vzdbr                      0/1     ContainerCreating   0          30s
weave-scope-agent-xvwsp                      0/1     ContainerCreating   0          30s
weave-scope-app-cf544d8c4-v9x5z              1/1     Running             0          30s
weave-scope-cluster-agent-6466d94ccf-r4vql   0/1     ContainerCreating   0          30s
[root@k8s-master ~]# kubectl get pod -n weave
NAME                                         READY   STATUS    RESTARTS   AGE
weave-scope-agent-bct26                      1/1     Running   0          57s
weave-scope-agent-vzdbr                      1/1     Running   0          57s
weave-scope-agent-xvwsp                      1/1     Running   0          57s
weave-scope-app-cf544d8c4-v9x5z              1/1     Running   0          57s
weave-scope-cluster-agent-6466d94ccf-r4vql   1/1     Running   0          57s
[root@k8s-master ~]# kubectl get svc -n weave 
NAME              TYPE       CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
weave-scope-app   NodePort   10.108.59.226   <none>        80:31013/TCP   68s
[root@k8s-master ~]# kubectl get deployments. -n weave 
NAME                        READY   UP-TO-DATE   AVAILABLE   AGE
weave-scope-app             1/1     1            1           81s
weave-scope-cluster-agent   1/1     1            1           80s

Daemonset weave scope agent, the scope agent program that runs on each node of the cluster, is responsible for collecting data.

Deployment web scope app, a scope application, obtains data from agent s, displays it through Web UI and interacts with users.

Service weave scope app, the default is ClusterIP type, and the parameter k8s service type = NodePort has been added to the above command to modify it to NodePort.

Using Scope

Browser access http://192.168.56.106:31013/，Scope By default, all current controllers (Deployment, DaemonSet, etc.) are displayed.

topological structure

Scope automatically builds the logical topology of applications and clusters. For example, click PODS at the top to display all PODS and their dependencies.

Click HOSTS to display the relationship between each node.

Real time resource monitoring

You can view the CPU and memory usage of resources in Scope.

Supported resources are Host, Pod, and Container.

Online operation

Scope also provides convenient online operation functions, such as selecting a Host and clicking the > button can directly open the command line terminal of the node in the browser: