kubernets中部署高可用nacos
nacos部署文档
由于官方文档部署比较简单，特意整理了一下，需者自提。 部署在kubernetes中，以NFS作为数据存储卷
环境介绍：
名称 | 版本 |
|---|---|
K8S | v1.17.2 |
Docker | 19.03.5 |
nacos | 1.3.0 |
一、拉取代码
git clone https://github.com/nacos-group/nacos-k8s.git
二、安装NFS服务
1、安装服务
yum install nfs-utils rpcbind -y
2、创建共享目录
mkdir /data/k8s -p
3、配置NFS配置文件
[root@master ~]# vim /etc/exports
/data/k8s *(rw,sync,no_root_squash)
配置详解：
ro 只读访问
rw 读写访问
sync 所有数据在请求时写入共享
async NFS在写入数据前可以相应请求
secure NFS通过1024以下的安全TCP/IP端口发送
insecure NFS通过1024以上的端口发送
wdelay 如果多个用户要写入NFS目录，则归组写入（默认）
no_wdelay 如果多个用户要写入NFS目录，则立即写入，当使用async时，无需此设置。
Hide 在NFS共享目录中不共享其子目录
no_hide 共享NFS目录的子目录
subtree_check 如果共享/usr/bin之类的子目录时，强制NFS检查父目录的权限（默认）
no_subtree_check 和上面相对，不检查父目录权限
all_squash 共享文件的UID和GID映射匿名用户anonymous，适合公用目录。
no_all_squash 保留共享文件的UID和GID（默认）
root_squash root用户的所有请求映射成如anonymous用户一样的权限（默认）
no_root_squas root用户具有根目录的完全管理访问权限
anonuid=xxx 指定NFS服务器/etc/passwd文件中匿名用户的UID
4、启动服务 先启动rpcbind，再启动nfs
systemctl start rpcbind && systemctl enable rpcbind
systemctl start nfs && systemctl enable nfs
5、客户端安装nfs和rpcbind测试 安装见第一步。
[root@node01 ~]# showmount -e 172.16.1.128
Export list for 172.16.1.128:
/data/k8s *
自此，NFS创建完成。
三、部署NFS provisioner
上面拉取完代码后，进入nacos-k8s/deploy/nfs，然后修改deployment.yaml中的NFS配置，如下：
apiVersion: v1
kind: ServiceAccount
metadata:
name: nfs-client-provisioner
---
kind: Deployment
apiVersion: apps/v1
metadata:
name: nfs-client-provisioner
spec:
replicas: 1
selector:
matchLabels:
app: nfs-client-provisioner
strategy:
type: Recreate
template:
metadata:
labels:
app: nfs-client-provisioner
spec:
serviceAccount: nfs-client-provisioner
containers:
- name: nfs-client-provisioner
image: quay.io/external_storage/nfs-client-provisioner:latest
volumeMounts:
- name: nfs-client-root
mountPath: /persistentvolumes
env:
- name: PROVISIONER_NAME
value: fuseim.pri/ifs
- name: NFS_SERVER
value: 172.17.100.50
- name: NFS_PATH
value: /home/middleware/nacos/cluster_nacos
volumes:
- name: nfs-client-root
nfs:
server: 172.17.100.50
path: /home/middleware/nacos/cluster_nacos
其中需要修改的地方：1、NFS_SERVER：NFS Server地址 2、NFS_PATH：NFS地址 3、PROVISIONER_NAME：可选泽修改，默认也可以，如果修改，后面使用的时候就用修改后的名字。另外，由于我的集群版本是v1.17.2，所以Deployment的版本还有一些语法需要修改，如上。
然后创建即可：
kubectl apply -f .
四、部署数据库
数据库依然部署在集群中，这里只部署单节点模式。进入数据库部署目录nacos-k8s/deploy/mysql 先创建namespace
kubectl create ns nacos
（1）、部署数据库，依然以NFS作为后端存储，修改配置文件 mysql-nfs.yaml的配置如下：
apiVersion: apps/v1
kind: Deployment
metadata:
name: mysql
namespace: nacos
labels:
name: mysql
spec:
replicas: 1
selector:
matchLabels:
name: mysql
template:
metadata:
labels:
name: mysql
spec:
containers:
- name: mysql
image: nacos/nacos-mysql:5.7
ports:
- containerPort: 3306
volumeMounts:
- name: mysql-data
mountPath: /var/lib/mysql
env:
- name: MYSQL_ROOT_PASSWORD
value: "root"
- name: MYSQL_DATABASE
value: "nacos"
- name: MYSQL_USER
value: "nacos"
- name: MYSQL_PASSWORD
value: "nacos"
volumes:
- name: mysql-data
nfs:
server: 10.1.10.130
path: /data/k8s/nacos/mysql
---
apiVersion: v1
kind: Service
metadata:
name: mysql
namespace: nacos
labels:
name: mysql
spec:
ports:
- port: 3306
targetPort: 3306
selector:
name: mysql
然后执行即可。
kubectl apply -f mysql-nfs.yaml
如果是自有数据库，则需要自己创建数据库，然后导入数据表。表所在位置：https://github.com/alibaba/nacos/blob/master/distribution/conf/nacos-mysql.sql
五、部署nacos
进入nacos-k8s/deploy/nacos，修改nacos-pvc-nfs.yaml，主要修改DB连接这块，修改成自己的。 1.0.0版本：
apiVersion: v1
kind: ServiceAccount
metadata:
name: nfs-client-provisioner
namespace: nacos
---
apiVersion: v1
kind: Service
metadata:
name: nacos-headless
namespace: nacos
labels:
app: nacos
annotations:
service.alpha.kubernetes.io/tolerate-unready-endpoints: "true"
spec:
ports:
- port: 8848
name: server
targetPort: 8848
clusterIP: None
selector:
app: nacos
---
apiVersion: v1
kind: ConfigMap
metadata:
name: nacos-cm
namespace: nacos
data:
mysql.master.db.name: "nacos"
mysql.master.db.host: "mysql.nacos.svc.cluster.local"
mysql.master.port: "3306"
mysql.master.user: "nacos"
mysql.master.password: "nacos"
mysql.slave.db.host: "mysql.nacos.svc.cluster.local"
mysql.slave.db.port: "3306"
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: nacos
namespace: nacos
spec:
serviceName: nacos
replicas: 3
template:
metadata:
labels:
app: nacos
annotations:
pod.alpha.kubernetes.io/initialized: "true"
spec:
# affinity:
# podAntiAffinity:
# requiredDuringSchedulingIgnoredDuringExecution:
# - labelSelector:
# matchExpressions:
# - key: "app"
# operator: In
# values:
# - nacos
# topologyKey: "kubernetes.io/hostname"
serviceAccountName: nfs-client-provisioner
initContainers:
- name: peer-finder-plugin-install
image: nacos/nacos-peer-finder-plugin:1.0
imagePullPolicy: IfNotPresent
volumeMounts:
- mountPath: "/home/nacos/plugins/peer-finder"
name: plugindir
containers:
- name: nacos
imagePullPolicy: IfNotPresent
image: swr.cn-north-1.myhuaweicloud.com/cartechfin/nacos:latest
resources:
requests:
memory: "2Gi"
cpu: "500m"
ports:
- containerPort: 8848
name: client-port
env:
- name: NACOS_REPLICAS
value: "3"
- name: SERVICE_NAME
value: "nacos"
- name: DOMAIN_NAME
value: "cluster.local"
- name: MYSQL_SLAVE_SERVICE_HOST
valueFrom:
configMapKeyRef:
name: nacos-cm
key: mysql.slave.db.host
- name: MYSQL_SLAVE_SERVICE_PORT
valueFrom:
configMapKeyRef:
name: nacos-cm
key: mysql.slave.db.port
- name: POD_NAMESPACE
valueFrom:
fieldRef:
apiVersion: v1
fieldPath: metadata.namespace
- name: MYSQL_MASTER_SERVICE_DB_NAME
valueFrom:
configMapKeyRef:
name: nacos-cm
key: mysql.master.db.name
- name: MYSQL_MASTER_SERVICE_PORT
valueFrom:
configMapKeyRef:
name: nacos-cm
key: mysql.master.port
- name: MYSQL_MASTER_SERVICE_USER
valueFrom:
configMapKeyRef:
name: nacos-cm
key: mysql.master.user
- name: MYSQL_MASTER_SERVICE_PASSWORD
valueFrom:
configMapKeyRef:
name: nacos-cm
key: mysql.master.password
- name: MYSQL_MASTER_SERVICE_HOST
valueFrom:
configMapKeyRef:
name: nacos-cm
key: mysql.master.db.host
- name: NACOS_SERVER_PORT
value: "8848"
- name: PREFER_HOST_MODE
value: "hostname"
volumeMounts:
- name: plugindir
mountPath: /home/nacos/plugins/peer-finder
- name: datadir
mountPath: /home/nacos/data
- name: logdir
mountPath: /home/nacos/logs
volumeClaimTemplates:
- metadata:
name: plugindir
annotations:
volume.beta.kubernetes.io/storage-class: "managed-nfs-storage"
spec:
accessModes: [ "ReadWriteMany" ]
resources:
requests:
storage: 5Gi
- metadata:
name: datadir
annotations:
volume.beta.kubernetes.io/storage-class: "managed-nfs-storage"
spec:
accessModes: [ "ReadWriteMany" ]
resources:
requests:
storage: 5Gi
- metadata:
name: logdir
annotations:
volume.beta.kubernetes.io/storage-class: "managed-nfs-storage"
spec:
accessModes: [ "ReadWriteMany" ]
resources:
requests:
storage: 5Gi
selector:
matchLabels:
app: nacos
1.3.0版本： （1）、把配置文件挂载到configMap中，方便修改参数 nacos-conf.yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: nacos-application-conf
namespace: nacos
data:
application.properties: |
# spring
server.servlet.contextPath=${SERVER_SERVLET_CONTEXTPATH:/nacos}
server.contextPath=/nacos
server.port=${NACOS_APPLICATION_PORT:8848}
spring.datasource.platform=${SPRING_DATASOURCE_PLATFORM:""}
nacos.cmdb.dumpTaskInterval=3600
nacos.cmdb.eventTaskInterval=10
nacos.cmdb.labelTaskInterval=300
nacos.cmdb.loadDataAtStart=false
db.num=${MYSQL_DATABASE_NUM:1}
db.url.0=jdbc:mysql://${MYSQL_SERVICE_HOST}:${MYSQL_SERVICE_PORT:3306}/${MYSQL_SERVICE_DB_NAME}?characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=true
db.url.1=jdbc:mysql://${MYSQL_SERVICE_HOST}:${MYSQL_SERVICE_PORT:3306}/${MYSQL_SERVICE_DB_NAME}?characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=true
db.user=${MYSQL_SERVICE_USER}
db.password=${MYSQL_SERVICE_PASSWORD}
### The auth system to use, currently only 'nacos' is supported:
nacos.core.auth.system.type=${NACOS_AUTH_SYSTEM_TYPE:nacos}
### The token expiration in seconds:
nacos.core.auth.default.token.expire.seconds=${NACOS_AUTH_TOKEN_EXPIRE_SECONDS:18000}
### The default token:
nacos.core.auth.default.token.secret.key=${NACOS_AUTH_TOKEN:SecretKey012345678901234567890123456789012345678901234567890123456789}
### Turn on/off caching of auth information. By turning on this switch, the update of auth information would have a 15 seconds delay.
nacos.core.auth.caching.enabled=${NACOS_AUTH_CACHE_ENABLE:false}
server.tomcat.accesslog.enabled=${TOMCAT_ACCESSLOG_ENABLED:false}
server.tomcat.accesslog.pattern=%h %l %u %t "%r" %s %b %D
# default current work dir
server.tomcat.basedir=
## spring security config
### turn off security
nacos.security.ignore.urls=/,/error,/**/*.css,/**/*.js,/**/*.html,/**/*.map,/**/*.svg,/**/*.png,/**/*.ico,/console-fe/public/**,/v1/auth/**,/v1/console/health/**,/actuator/**,/v1/console/server/**
# metrics for elastic search
management.metrics.export.elastic.enabled=false
management.metrics.export.influx.enabled=false
nacos.naming.distro.taskDispatchThreadCount=10
nacos.naming.distro.taskDispatchPeriod=200
nacos.naming.distro.batchSyncKeyCount=1000
nacos.naming.distro.initDataRatio=0.9
nacos.naming.distro.syncRetryDelay=5000
nacos.naming.data.warmup=true
修改deploy.yaml配置文件如下
apiVersion: v1
kind: ServiceAccount
metadata:
name: nfs-client-provisioner
namespace: nacos
---
apiVersion: v1
kind: Service
metadata:
name: nacos
namespace: nacos
labels:
app: nacos
annotations:
service.alpha.kubernetes.io/tolerate-unready-endpoints: "true"
spec:
ports:
- port: 8848
name: server
targetPort: 8848
clusterIP: None
selector:
app: nacos
---
apiVersion: v1
kind: ConfigMap
metadata:
name: nacos-cm
namespace: nacos
data:
mysql.db.name: "nacos"
mysql.db.host: "mysql.nacos.svc.cluster.local"
mysql.port: "3306"
mysql.user: "nacos"
mysql.password: "nacos"
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: nacos
namespace: nacos
spec:
serviceName: nacos
replicas: 3
template:
metadata:
labels:
app: nacos
annotations:
pod.alpha.kubernetes.io/initialized: "true"
spec:
# affinity:
# podAntiAffinity:
# requiredDuringSchedulingIgnoredDuringExecution:
# - labelSelector:
# matchExpressions:
# - key: "app"
# operator: In
# values:
# - nacos
# topologyKey: "kubernetes.io/hostname"
serviceAccountName: nfs-client-provisioner
initContainers:
- name: peer-finder-plugin-install
image: nacos/nacos-peer-finder-plugin:1.0
imagePullPolicy: IfNotPresent
volumeMounts:
- mountPath: "/home/nacos/plugins/peer-finder"
name: plugindir
volumes:
- name: application-conf
configMap:
name: nacos-application-conf
containers:
- name: nacos
imagePullPolicy: IfNotPresent
image: nacos/nacos-server:1.3.0
resources:
requests:
memory: "2Gi"
cpu: "500m"
ports:
- containerPort: 8848
name: client-port
env:
- name: NACOS_REPLICAS
value: "3"
- name: SERVICE_NAME
value: "nacos"
- name: DOMAIN_NAME
value: "cluster.local"
- name: POD_NAMESPACE
valueFrom:
fieldRef:
apiVersion: v1
fieldPath: metadata.namespace
- name: MYSQL_SERVICE_DB_NAME
valueFrom:
configMapKeyRef:
name: nacos-cm
key: mysql.db.name
- name: MYSQL_SERVICE_PORT
valueFrom:
configMapKeyRef:
name: nacos-cm
key: mysql.port
- name: MYSQL_SERVICE_USER
valueFrom:
configMapKeyRef:
name: nacos-cm
key: mysql.user
- name: MYSQL_SERVICE_PASSWORD
valueFrom:
configMapKeyRef:
name: nacos-cm
key: mysql.password
- name: MYSQL_SERVICE_HOST
valueFrom:
configMapKeyRef:
name: nacos-cm
key: mysql.db.host
- name: NACOS_SERVER_PORT
value: "8848"
- name: PREFER_HOST_MODE
value: "hostname"
volumeMounts:
- name: plugindir
mountPath: /home/nacos/plugins/peer-finder
- name: datadir
mountPath: /home/nacos/data
- name: logdir
mountPath: /home/nacos/logs
- name: application-conf
mountPath: /home/nacos/conf/application.properties
subPath: application.properties
volumeClaimTemplates:
- metadata:
name: plugindir
annotations:
volume.beta.kubernetes.io/storage-class: "managed-nfs-storage"
spec:
accessModes: [ "ReadWriteMany" ]
resources:
requests:
storage: 5Gi
- metadata:
name: datadir
annotations:
volume.beta.kubernetes.io/storage-class: "managed-nfs-storage"
spec:
accessModes: [ "ReadWriteMany" ]
resources:
requests:
storage: 5Gi
- metadata:
name: logdir
annotations:
volume.beta.kubernetes.io/storage-class: "managed-nfs-storage"
spec:
accessModes: [ "ReadWriteMany" ]
resources:
requests:
storage: 5Gi
selector:
matchLabels:
app: nacos
浏览器访问
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: nacos
namespace: nacos
spec:
rules:
- host: nacos.coolops.cn
http:
paths:
- backend:
serviceName: nacos
servicePort: 8848
六、参数调优
（1）、JVM调优 集群模式默认的配置如下：
if [[ "${EMBEDDED_STORAGE}" == "embedded" ]]; then
JAVA_OPT="${JAVA_OPT} -DembeddedStorage=true"
fi
JAVA_OPT="${JAVA_OPT} -server -Xms${JVM_XMS} -Xmx${JVM_XMX} -Xmn${JVM_XMN} -XX:MetaspaceSize=${JVM_MS} -XX:MaxMetaspaceSize=${JVM_MMS}"
if [[ "${NACOS_DEBUG}" == "y" ]]; then
JAVA_OPT="${JAVA_OPT} -Xdebug -Xrunjdwp:transport=dt_socket,address=9555,server=y,suspend=n"
fi
JAVA_OPT="${JAVA_OPT} -XX:-OmitStackTraceInFastThrow -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=${BASE_DIR}/logs/java_heapdump.hprof"
JAVA_OPT="${JAVA_OPT} -XX:-UseLargePages"
print_servers
如果要更改内存大小，直接更新deployment的yaml文件，将上面的参数通过env的方式传递进去。
七、监控
使用Prometheus进行监控，首先打开server端metrics。如下修改configMap的配置文件：
nacos.security.ignore.urls=/,/error,/**/*.css,/**/*.js,/**/*.html,/**/*.map,/**/*.svg,/**/*.png,/**/*.ico,/console-fe/public/**,/v1/auth/**,/v1/console/health/**,/v1/console/server/**
# metrics for elastic search
management.metrics.export.elastic.enabled=false
management.metrics.export.influx.enabled=false
management.endpoints.web.exposure.include=*
然后访问{ip}:8848/nacos/actuator/prometheus 查看是否能正确收集到指标： 需要监控的指标主要有：
指标 | 含义 |
|---|---|
system_cpu_usage | cpu的使用率 |
jvm_memory_used_bytes | 内存使用率 |
system_load_average_1m | 系统负载 |
nacos_monitor{name='failedPush'} | Nacos naming推送失败数 |
nacos_exception_total{name='db'} | 数据库异常检查 |
nacos_exception_total{name='configNotify'} | Nacos config水平通知失败 |
nacos_exception_total{name='unhealth'} | 集群健康检查 |
nacos_exception_total{name='disk'} | 读写磁盘异常检查 |
nacos_exception_total{name='leaderSendBeatFailed'} | Nacos naming leader发送心跳异常 |
nacos_exception_total{name='illegalArgument'} | 请求参数不合法 |
nacos_exception_total{name='nacos'} | Nacos请求响应内部错误异常（读写失败，没权限，参数错误） |
nacosSync_sync_task_error | 所有同步执行时的异常检查 |
以上指标如果异常需要及时告警处理。
参考文档：https://nacos.io/en-us/docs/use-nacos-with-kubernetes.html
完
本文参与 腾讯云自媒体同步曝光计划，分享自微信公众号。
原始发表：2020-06-08，如有侵权请联系 cloudcommunity@tencent.com 删除
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