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README.md

Kubernetes Nacos

This project contains a Nacos Docker image meant to facilitate the deployment of Nacos on Kubernetes via StatefulSets.

中文文档

Tips

If you are using Nacos version 1.1.4 or lower,, please refer to this Tag

Quick Start

  • Clone Project
git clone https://github.com/nacos-group/nacos-k8s.git
  • Simple Start

If you want to start Nacos without NFS, but emptyDirs will possibly result in a loss of data. as follows:

cd nacos-k8s
chmod +x quick-startup.sh
./quick-startup.sh
  • Testing

    • Service registration
    curl -X PUT 'http://cluster-ip:8848/nacos/v1/ns/instance?serviceName=nacos.naming.serviceName&ip=20.18.7.10&port=8080'
    • Service discovery
    curl -X GET 'http://cluster-ip:8848/nacos/v1/ns/instances?serviceName=nacos.naming.serviceName'
    • Publish config
    curl -X POST "http://cluster-ip:8848/nacos/v1/cs/configs?dataId=nacos.cfg.dataId&group=test&content=helloWorld"
    • Get config
    curl -X GET "http://cluster-ip:8848/nacos/v1/cs/configs?dataId=nacos.cfg.dataId&group=test"

Advanced

In advanced use, the cluster is automatically scaled and data is persisted, but PersistentVolumeClaims must be deployed. In this example, NFS is used.

Deploy NFS

  • Create Role
kubectl create -f deploy/nfs/rbac.yaml

If your K8S namespace is not default, execute the following script before creating RBAC

# Set the subject of the RBAC objects to the current namespace where the provisioner is being deployed
$ NS=$(kubectl config get-contexts|grep -e "^\*" |awk '{print $5}')
$ NAMESPACE=${NS:-default}
$ sed -i'' "s/namespace:.*/namespace: $NAMESPACE/g" ./deploy/nfs/rbac.yaml
  • Create ServiceAccount And deploy NFS-Client Provisioner
kubectl create -f deploy/nfs/deployment.yaml
  • Create NFS StorageClass
kubectl create -f deploy/nfs/class.yaml
  • Verify that NFS is working
kubectl get pod -l app=nfs-client-provisioner

Deploy database

  • Deploy mysql

cd nacos-k8s

kubectl create -f deploy/mysql/mysql-nfs.yaml
  • Verify that Database is working

kubectl get pod 
NAME                         READY   STATUS    RESTARTS   AGE
mysql-gf2vd                        1/1     Running   0          111m

Deploy Nacos

  • Modify depoly/nacos/nacos-pvc-nfs.yaml
data:
  mysql.db.name: "db name"
  mysql.port: " db port"
  mysql.user: " db username"
  mysql.password: " db password"
  • Create Nacos
kubectl create -f nacos-k8s/deploy/nacos/nacos-pvc-nfs.yaml
  • Verify that Nacos is working
kubectl get pod -l app=nacos


NAME      READY   STATUS    RESTARTS   AGE
nacos-0   1/1     Running   0          19h
nacos-1   1/1     Running   0          19h
nacos-2   1/1     Running   0          19h

Scale Testing

  • Use kubectl exec to get the cluster config of the Pods in the nacos StatefulSet.
for i in 0 1; do echo nacos-$i; kubectl exec nacos-$i cat conf/cluster.conf; done

The StatefulSet controller provides each Pod with a unique hostname based on its ordinal index. The hostnames take the form of <statefulset name>-<ordinal index>. Because the replicas field of the nacos StatefulSet is set to 2, In the cluster file only two nacos address

k8s

  • Use kubectl to scale StatefulSets
kubectl scale sts nacos --replicas=3

scale

  • Use kubectl exec to get the cluster config of the Pods in the nacos StatefulSet after scale StatefulSets
for i in 0 1 2; do echo nacos-$i; kubectl exec nacos-$i cat conf/cluster.conf; done

get_cluster_after

  • Use kubectl exec to get the state of the Pods in the nacos StatefulSet after scale StatefulSets
for i in 0 1 2; do echo nacos-$i; kubectl exec nacos-$i curl GET "http://localhost:8848/nacos/v1/ns/raft/state"; done

You can find that the new node has joined the cluster

Prerequisites

  • Kubernetes Node configuration(for reference only)
Hostname Configuration
k8s-master CentOS Linux release 7.4.1708 (Core) Single-core processor Mem 4G Cloud disk 40G
node01 CentOS Linux release 7.4.1708 (Core) Single-core processor Mem 4G Cloud disk 40G
node02 CentOS Linux release 7.4.1708 (Core) Single-core processor Mem 4G Cloud disk 40G
  • Kubernetes version:1.12.2+
  • NFS version:4.1+

Limitations

  • Persistent Volumes must be used. emptyDirs will possibly result in a loss of data

Project directory

Directory Name Description
plugin Help Nacos cluster achieve automatic scaling in K8s
deploy Deploy the required files

Configuration properties

  • nacos-pvc-nfs.yaml or nacos-quick-start.yaml
Name Required Description
mysql.db.name Y database name
mysql.port N database port
mysql.user Y database username
mysql.password Y database password
NACOS_REPLICAS Y The number of clusters must be consistent with the value of the replicas attribute
NACOS_SERVER_PORT N Nacos port,default:8848 for Peer-finder plugin
NACOS_APPLICATION_PORT N Nacos port, default:8848
PREFER_HOST_MODE Y Enable Nacos cluster node domain name support
  • nfs deployment.yaml
Name Required Description
NFS_SERVER Y NFS server address
NFS_PATH Y NFS server shared directory
server Y NFS server address
path Y NFS server shared directory
  • mysql yaml
Name Required Description
MYSQL_ROOT_PASSWORD N Root password
MYSQL_DATABASE Y Database Name
MYSQL_USER Y Database Username
MYSQL_PASSWORD Y Database Password
Nfs:server Y NFS server address
Nfs:path Y NFS server shared path

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