biglittleant

不被嘲笑的梦想,是不值得去实现的

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死磕nginx系列--使用upsync模块实现负载均衡

简介:upsync模块是用来解决配置文件修改后,reload nginx进程造成性能下降的问题。

处理流程
它的功能是拉取 consul 的后端 server 的列表,并更新 Nginx 的路由信息。此模块不依赖于任何第三方模块。consul 作为 Nginx 的 db,利用 consul 的 KV 服务,每个 Nginx work 进程独立的去拉取各个 upstream 的配置,并更新各自的路由。

实战

给nginx打补丁包

这步可以不做,如果不做,编译的时候删除这个模块

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git clone https://github.com/xiaokai-wang/nginx_upstream_check_module
## 打补丁包
patch -p0 < /usr/local/src/nginx_upstream_check_module-master/check_1.9.2+.patch

下载nginx-upsync-module源码

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git clone https://github.com/weibocom/nginx-upsync-module.git

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下载nginx源码
wget 'http://nginx.org/download/nginx-1.10.1.tar.gz'
tar -xzvf nginx-1.10.1.tar.gz
cd nginx-1.10.1/
开始编译
./configure --prefix=/data/app/nginx-1.10.1 --user=nginx --group=nginx --with-http_ssl_module --with-http_stub_status_module --add-module=/usr/local/src/nginx-upsync-module-master/ --add-module=/usr/local/src/nginx_upstream_check_module-master/
make
make install

启动consul

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wget https://releases.hashicorp.com/consul/0.6.4/consul_0.6.4_linux_amd64.zip
unzip consul_0.6.4_linux_amd64.zip
./consul agent -advertise=x.x.x.x -client=0.0.0.0 -dev

创建nginx配置文件

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mkdir -p /usr/local/nginx/conf/servers
/usr/local/nginx/conf/nginx.conf
events {
worker_connections 4096; ## Default: 1024
}

http {
upstream test {
# fake server otherwise ngx_http_upstream will report error when startup
server 127.0.0.1:11111;

# all backend server will pull from consul when startup and will delete fake server
upsync 127.0.0.1:8500/v1/kv/upstreams/test upsync_timeout=6m upsync_interval=500ms upsync_type=consul strong_dependency=off;
upsync_dump_path /usr/local/nginx/conf/servers/servers_test.conf;
}

upstream bar {
server 127.0.0.1:8090 weight=1 fail_timeout=10 max_fails=3;
}

server {
listen 8080;

location = /proxy_test {
proxy_pass http://test;
}

location = /bar {
proxy_pass http://bar;
}

location = /upstream_show {
upstream_show;
}

}
}

测试

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for i in `seq 3`;do mkdir html$i/test -p && echo $i >html$i/test/test.html; done;

docker run -d -p 8001:80 -v /root/html1/:/usr/share/nginx/html nginx
docker run -d -p 8002:80 -v /root/html2/:/usr/share/nginx/html nginx
docker run -d -p 8003:80 -v /root/html3/:/usr/share/nginx/html nginx

添加服务

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curl -X PUT -d '{"weight":1, "max_fails":2, "fail_timeout":10}' http://127.0.0.1:8500/v1/kv/upstreams/test/192.168.56.12:8001
curl -X PUT -d '{"weight":1, "max_fails":2, "fail_timeout":10}' http://127.0.0.1:8500/v1/kv/upstreams/test/192.168.56.12:8002
curl -X PUT -d '{"weight":1, "max_fails":2, "fail_timeout":10}' http://127.0.0.1:8500/v1/kv/upstreams/test/192.168.56.12:8003

查看conf/servers/servers_test.conf 文件中是否有内容

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cat conf/servers/servers_test.conf
server 192.168.56.12:8003 weight=1 max_fails=2 fail_timeout=10s;
server 192.168.56.12:8002 weight=1 max_fails=2 fail_timeout=10s;
server 192.168.56.12:8001 weight=1 max_fails=2 fail_timeout=10s;

或者浏览器打开http://192.168.56.11:8080/upstream_show?test
显示内容如下:

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Upstream name: test; Backend server count: 3
server 192.168.56.12:8003 weight=1 max_fails=2 fail_timeout=10s;
server 192.168.56.12:8002 weight=1 max_fails=2 fail_timeout=10s;
server 192.168.56.12:8001 weight=1 max_fails=2 fail_timeout=10s;

总结
此模块只修改upstream 中的缓存信息,不能修改或添加其他配置

测试中遇到的问题
在添加服务时出现如下错误,导致服务添加不能实时进行,大约需要3分钟左右时间。

consul日志:

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2016/03/22 05:34:42 [DEBUG] http: Request GET /v1/kv/upstreams/test?recurse&index=169 (149.023µs) from=127.0.0.1:38853
2016/03/22 05:34:43 [DEBUG] http: Request GET /v1/kv/upstreams/test?recurse&index=169 (146.759µs) from=127.0.0.1:38854
2016/03/22 05:34:45 [DEBUG] http: Request GET /v1/kv/upstreams/test?recurse&index=169 (149.853µs) from=127.0.0.1:38855
2016/03/22 05:34:46 [DEBUG] http: Request GET /v1/kv/upstreams/test?recurse&index=169 (111.46µs) from=127.0.0.1:38856
2016/03/22 05:34:48 [DEBUG] http: Request GET /v1/kv/upstreams/test?recurse&index=169 (142.696µs) from=127.0.0.1:38857
2016/03/22 05:34:48 [DEBUG] http: Request GET /v1/kv/upstreams/test?recurse&index=169 (112.089µs) from=127.0.0.1:38858
2016/03/22 05:34:49 [DEBUG] http: Request GET /v1/kv/upstreams/test?recurse&index=169 (114.29µs) from=127.0.0.1:38859
2016/03/22 05:34:50 [DEBUG] http: Request GET /v1/kv/upstreams/test?recurse&index=169 (148.245µs) from=127.0.0.1:38860

nginx日志

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2016/03/22 05:35:09 [error] 18879#0: recv() failed (104: Connection reset by peer)
2016/03/22 05:35:09 [error] 18879#0: upsync_recv: recv error with upsync_server: 127.0.0.1:8500
2016/03/22 05:35:10 [error] 18879#0: recv() failed (104: Connection reset by peer)
2016/03/22 05:35:10 [error] 18879#0: upsync_recv: recv error with upsync_server: 127.0.0.1:8500
2016/03/22 05:35:11 [error] 18879#0: recv() failed (104: Connection reset by peer)
2016/03/22 05:35:11 [error] 18879#0: upsync_recv: recv error with upsync_server: 127.0.0.1:8500
2016/03/22 05:35:13 [error] 18879#0: recv() failed (104: Connection reset by peer)
2016/03/22 05:35:13 [error] 18879#0: upsync_recv: recv error with upsync_server: 127.0.0.1:8500
2016/03/22 05:35:13 [error] 18879#0: recv() failed (104: Connection reset by peer)
2016/03/22 05:35:13 [error] 18879#0: upsync_recv: recv error with upsync_server: 127.0.0.1:8500
2016/03/22 05:35:14 [error] 18879#0: recv() failed (104: Connection reset by peer)

问题现象
当添加一个服务时,出现此问题,新增服务不能及时添加到负载中,不影响运行正常的服务。 此时再往consul继续添加一个服务时,可能会导致此错误终止,并能成功添加当前两条服务记录。

帮助文档

官方github地址
nginx_upstream_check_module