简单学习一下微服务
集群：堆服务器解决同一个问题，物理层面。
分布式：一个复杂问题拆分成若干小问题，小问题结果整合实现大需求，软件设计层面。
现在流行的微服务框架有 dubbo、spring cloud、grpc。
简单学习一下dubbo。
官网 dubbo.apache.org/zh/
核心为 RPC通信 和 微服务治理。
RPC：远程过程调用，Remote Process Call。
服务治理：服务提供者、服务消费者、注册中心。
微服务将自己信息存储到注册中心叫服务注册，服务消费者从注册中心获取服务提供者信息，叫服务发现。
配图 dobbo_architecture.png
特么的梯子挂了，连GitHub都打不开了。。。。
新建一个SpringBoot Web项目。
配图1
特么的网络有问题建个项目都各种莫名其妙的问题。。。。。
https://start.spring.io connect time out，用 https://start.aliyun.com 替换
哎，真是特色bug了。。。。还是改回start.spring.io吧，阿里的跟spring.io不太一样。。。。
写代码1个小时，解决网络问题五个小时。。。。
代码结构与TestRMI基本一致，区别就是 TestRMI需要自定义RMIConfig，Dubbo使用现成的服务中心。
api： 与TestRMI一致。
provider：服务提供者；
consumer：消费者。
修改provider的Service impl @Service注解为dubbo。
provider application.yml
server: port: 8081 # dubbo config dubbo: application: name: provider registry: #注册中心地址 # address: multicast://224.5.6.7:1234 # zookeeper 注册中心地址 address: zookeeper://172.16.5.131:2181 timeout: 6000 #元数据中心地址 metadata-report: address: zookeeper://172.16.5.131:2181 protocol: #协议名称 name: dubbo port: 20880 scan: base-packages: dc.test.provider.service
修改consumer的IUserService注入为dubbo的 @Reference
consumer的application.yml
server: port: 8082 #dubbo config dubbo: application: name: consumer registry: #消费者从哪个地址找服务 # address: multicast://224.5.6.7:1234 address: zookeeper://172.16.5.131:2181
启动运行即可，dubbo代码端的简单集成OK。
zookeeper single 部署
[senrsl@localhost ~]$ wget https://dlcdn.apache.org/zookeeper/zookeeper-3.8.0/apache-zookeeper-3.8.0-bin.tar.gz
[senrsl@localhost ~]$ mkdir zookeep_single
[senrsl@localhost ~]$ tar zxvf apache-zookeeper-3.8.0-bin.tar.gz -C zookeep_single/
[senrsl@localhost ~]$ cp zoo_sample.cfg zoo.cfg
[senrsl@localhost ~]$ cat zookeep_single/apache-zookeeper-3.8.0-bin/conf/zoo.cfg
# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just
# example sakes.
#dataDir=/tmp/zookeeper
dataDir=/home/senrsl/zookeep_single/data
logDir=/home/senrsl/zookeep_single/log
# the port at which the clients will connect
clientPort=2181
# the maximum number of client connections.
# increase this if you need to handle more clients
#maxClientCnxns=60
#
# Be sure to read the maintenance section of the
# administrator guide before turning on autopurge.
#
# https://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance
#
# The number of snapshots to retain in dataDir
#autopurge.snapRetainCount=3
# Purge task interval in hours
# Set to "0" to disable auto purge feature
#autopurge.purgeInterval=1
## Metrics Providers
#
# https://prometheus.io Metrics Exporter
#metricsProvider.className=org.apache.zookeeper.metrics.prometheus.PrometheusMetricsProvider
#metricsProvider.httpHost=0.0.0.0
#metricsProvider.httpPort=7000
#metricsProvider.exportJvmInfo=true
[senrsl@localhost ~]$
安装java
[senrsl@localhost ~]$ yum search jdk
[senrsl@localhost ~]$ yum install -y java-1.8.0-openjdk.x86_64
启动zookeeper
[senrsl@localhost bin]$ ./zkServer.sh start
/usr/bin/java
ZooKeeper JMX enabled by default
Using config: /home/senrsl/zookeep_single/apache-zookeeper-3.8.0-bin/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
[senrsl@localhost bin]$ ./zkServer.sh status
/usr/bin/java
ZooKeeper JMX enabled by default
Using config: /home/senrsl/zookeep_single/apache-zookeeper-3.8.0-bin/bin/../conf/zoo.cfg
Client port found: 2181. Client address: localhost. Client SSL: false.
Mode: standalone
[senrsl@localhost bin]$
关闭centos 防火墙
[senrsl@localhost ~]$ systemctl stop firewalld.service
[senrsl@localhost ~]$ systemctl status firewalld.service
然后将provider和consumer服务中心地址注册到zookeeper地址即可。
zookeeper集群
#解压复制三份，123，然后配置data和log配置123
[senrsl@localhost ~]$ ls zookeep_multi/
data1 data2 data3 zookeeper1 zookeeper2 zookeeper3#每份在data下配置myid,为123
[senrsl@localhost ~]$ cat zookeep_multi/data1/myid
1
[senrsl@localhost ~]$ cat zookeep_multi/zookeeper1/conf/zoo.cfg
# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just
# example sakes.
#dataDir=/tmp/zookeeper
dataDir=/home/senrsl/zookeep_multi/data1
logDir=/home/senrsl/zookeep_multi/log1
# the port at which the clients will connect
clientPort=2181 //分别为2181、2182、2183
# the maximum number of client connections.
# increase this if you need to handle more clients
#maxClientCnxns=60
#
# Be sure to read the maintenance section of the
# administrator guide before turning on autopurge.
#
# https://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance
#
# The number of snapshots to retain in dataDir
#autopurge.snapRetainCount=3
# Purge task interval in hours
# Set to "0" to disable auto purge feature
#autopurge.purgeInterval=1
## Metrics Providers
#
# https://prometheus.io Metrics Exporter
#metricsProvider.className=org.apache.zookeeper.metrics.prometheus.PrometheusMetricsProvider
#metricsProvider.httpHost=0.0.0.0
#metricsProvider.httpPort=7000
#metricsProvider.exportJvmInfo=true
# server.1中1是data/myid中内容,2888 2889用于集群内部通信,3888,3889用于选择leader
server.1=172.16.5.131:2888:3888
server.2=172.16.5.131:2889:3889
server.3=172.16.5.131:2890:3890
[senrsl@localhost ~]$
依次启动123
检查状态
senrsl@localhost ~]$ ./zookeep_multi/zookeeper1/bin/zkServer.sh status
/usr/bin/java
ZooKeeper JMX enabled by default
Using config: /home/senrsl/zookeep_multi/zookeeper1/bin/../conf/zoo.cfg
Client port found: 2181. Client address: localhost. Client SSL: false.
Mode: follower
[senrsl@localhost ~]$ ./zookeep_multi/zookeeper2/bin/zkServer.sh status
/usr/bin/java
ZooKeeper JMX enabled by default
Using config: /home/senrsl/zookeep_multi/zookeeper2/bin/../conf/zoo.cfg
Client port found: 2182. Client address: localhost. Client SSL: false.
Mode: leader
[senrsl@localhost ~]$ ./zookeep_multi/zookeeper3/bin/zkServer.sh status
/usr/bin/java
ZooKeeper JMX enabled by default
Using config: /home/senrsl/zookeep_multi/zookeeper3/bin/../conf/zoo.cfg
Client port found: 2183. Client address: localhost. Client SSL: false.
Mode: follower
[senrsl@localhost ~]$
然后修改代码中注册中心地址即可。
监控中心 dubbo-admin
直接走docker，省事
SENRSL:docker senrsl$ docker pull apache/dubbo-admin
docker run -d \
--name dubbo-admin \
-v /Users/senrsl/test/docker/dubbo:/data \
-p 8100:8080 \
-e admin.registry.address=zookeeper://172.16.5.131:2181 \
-e admin.config-center=zookeeper://172.16.5.131:2181 \
-e admin.metadata-report.address=zookeeper://172.16.5.131:2181 \
--restart=always \
docker.io/apache/dubbo-admin;
启动 http://localhost:8100/ 即可。
senRsl
2022年06月09日15:23:43
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