JAVA项目负载均衡和双机热备
1. 配置后台项目的Mysql和redis
2. 用mvn打包
mvn clean install -Dmaven.test.skip=true
3. 运行JAVA容器，部署并运行JAR文件,记住把jar上传到j1卷
docker volume create j1
docker run -it -d --name j1 -v j1:/home/soft --net=host java
docker exec -it j1 bash
nohup java -jar /home/soft/test.jar
nohup：是后台挂起的指令，不加，会显示java启动日志
net=host 意思是使用宿主机的网络
4. 打包springboot项目为jar包，遇到的坑
- 修改redis为集群地址，注释掉spring.redis.host、spring.redis.port、spring.redis.password
#jediscluster
cluster1.host.port=172.19.0.2:6379
cluster2.host.port=172.19.0.3:6379
cluster3.host.port=172.19.0.4:6379
cluster4.host.port=172.19.0.5:6379
cluster5.host.port=172.19.0.6:6379
cluster6.host.port=172.19.0.7:6379
#jediscluster
#rediscluster
spring.redis.cluster.nodes=172.19.0.2:6379,172.19.0.2:6379,172.19.0.2:6379,172.19.0.2:6379,172.19.0.2:6379,172.19.0.2:6379
spring.redis.cluster.max-redirects=3
- 修改项目server.post=6001
- 添加springboot启动类，在pom.xml添加
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<mainClass>包名.Application</mainClass>
</configuration>
</plugin>
- 使用IDEA打包jar包，Maven Project->package 点击运行
5. 后端做负载
- 修改后端代码，把端口改为6002，然后打包出jar包
- 在终端执行如下
docker volume create j2
#把后端打包的jar上传到j2卷，然后执行
docker run -it -d --name j2 -v j2:/home/soft --net=host java
docker exec -it j2 bash
nohup java -jar /home/soft/test.jar
docker volume create j3
#把后端打包的jar上传到j3卷，然后执行
docker run -it -d --name j3 -v j3:/home/soft --net=host java
docker exec -it j3 bash
nohup java -jar /home/soft/test.jar
- Nginx是性能非常出色的反向代理服务器，最大可以支持8万/秒的并发访问
user nginx;
worker_processes 1;
error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;
events {
worker_connections 1024;
}
http {
include /etc/nginx/mime.types;
default_type application/octet-stream;
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /var/log/nginx/access.log main;
sendfile on;
#tcp_nopush on;
keepalive_timeout 65;
#gzip on;
proxy_redirect off;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
client_max_body_size 10m;
client_body_buffer_size 128k;
proxy_connect_timeout 5s;
proxy_send_timeout 5s;
proxy_read_timeout 5s;
proxy_buffer_size 4k;
proxy_buffers 4 32k;
proxy_busy_buffers_size 64k;
proxy_temp_file_write_size 64k;
upstream tomcat {
server 10.211.55.15:6001;
server 10.211.55.15:6002;
server 10.211.55.15:6003;
}
server {
listen 6101;
server_name 10.211.55.15;
location / {
proxy_set_header Host $host:6101; #这里是重点,这样配置才不会丢失端口
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_pass http://tomcat;
index index.html index.htm;
}
}
}
docker pull nginx
mkdir /home/n1
docker run -it -d --name n1 -v /home/n1/nginx.conf:/etc/nginx/nginx.conf --net=host --privileged nginx
这里使用的映射，而不是数据卷，因为数据卷只能实现目录与目录的映射。
- 修改n1
docker exec -it n1 bash
apt-get update
apt-get install keepalived
apt-get install vim
vim /etc/keepalived/keepalived.conf
service keepalived start
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 123456
}
virtual_ipaddress {
10.211.55.16
}
}
virtual_server 10.211.55.16 6201 {
delay_loop 3
lb_algo rr
lb_kind NAT
persistence_timeout 50
protocol TCP
real_server 10.211.55.15 6101 {
weight 1
}
}
- 修改n2
docker exec -it n1 bash
apt-get update
apt-get install keepalived
apt-get install vim
vim /etc/keepalived/keepalived.conf
service keepalived start
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 123456
}
virtual_ipaddress {
10.211.55.16
}
}
virtual_server 10.211.55.16 6201 {
delay_loop 3
lb_algo rr
lb_kind NAT
persistence_timeout 50
protocol TCP
real_server 10.211.55.15 6102 {
weight 1
}
}
- 访问http://10.211.55.16:6201项目路径测试是否成功。
