Name
nginx-upsync-module - Nginx C module, sync upstreams from consul or others, dynamically modify backend-servers attribute(weight, max_fails,...), needn't reload nginx.
It may not always be convenient to modify configuration files and restart NGINX. For example, if you are experiencing large amounts of traffic and high load, restarting NGINX and reloading the configuration at that point further increases load on the system and can temporarily degrade performance.
The module can be more smoothly expansion and constriction, and will not influence the performance.
Another module, nginx-stream-upsync-module supports nginx stream module(TCP protocol), please be noticed.
Table of Contents
- Name
- Status
- Synopsis
- Description
- Directives
- Consul_interface
- Etcd_interface
- Check_module
- TODO
- Compatibility
- Installation
- Code style
- Author
- Copyright and License
- See Also
- Source Dependency
Status
This module is still under active development and is considered production ready.
Synopsis
nginx-consul:
http {
upstream test {
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;
include /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;
}
}
}
nginx-etcd:
http {
upstream test {
upsync 127.0.0.1:2379/v2/keys/upstreams/test upsync_timeout=6m upsync_interval=500ms upsync_type=etcd strong_dependency=off;
upsync_dump_path /usr/local/nginx/conf/servers/servers_test.conf;
include /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;
}
}
}
upsync_lb:
http {
upstream test {
least_conn; //hash $uri consistent;
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;
upsync_lb least_conn; //hash_ketama;
include /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;
}
}
}
NOTE: recomending strong_dependency is configed off and the first time included file include all the servers.
Description
This module provides a method to discover backend servers. Supporting dynamicly adding or deleting backend server through consul or etcd and dynamically adjusting backend servers weight, module will timely pull new backend server list from consul or etcd to upsync nginx ip router. Nginx needn't reload. Having some advantages than others:
-
timely
module send key to consul/etcd with index, consul/etcd will compare it with its index, if index doesn't change connection will hang five minutes, in the period any operation to the key-value, will feed back rightaway. -
performance
Pulling from consul/etcd equal a request to nginx, updating ip router nginx needn't reload, so affecting nginx performance is little. -
stability
Even if one pulling failed, it will pull next upsync_interval, so guarantying backend server stably provides service. And support dumping the latest config to location, so even if consul/etcd hung up, and nginx can be reload anytime. -
health_check
nginx-upsync-module support adding or deleting servers health check, needing nginx_upstream_check_module. Recommending nginx-upsync-module + nginx_upstream_check_module.
Directives
upsync
syntax: upsync $consul/etcd.api.com:$port/v1/kv/upstreams/$upstream_name/ [upsync_type=consul/etcd] [upsync_interval=second/minutes] [upsync_timeout=second/minutes] [strong_dependency=off/on]
default: none, if parameters omitted, default parameters are upsync_interval=5s upsync_timeout=6m strong_dependency=off
context: upstream
description: Pull upstream servers from consul/etcd... .
The parameters' meanings are:
-
upsync_interval
pulling servers from consul/etcd interval time.
-
upsync_timeout
pulling servers from consul/etcd request timeout.
-
upsync_type
pulling servers from conf server type.
-
strong_dependency
when strong_dependency is on, nginx will pull servers from consul/etcd every time when nginx start up or reload.
upsync_dump_path
syntax: upsync_dump_path $path
default: /tmp/servers_$host.conf
context: upstream
description: dump the upstream backends to the $path.
upsync_lb
syntax: upsync_lb $load_balance
default: round_robin/ip_hash/hash modula
context: upstream
description: mainly for least_conn and hash consistent, when using one of them, you must point out using upsync_lb.
upstream_show
syntax: upstream_show
default: none
context: upstream
description: Show specific upstream all backend servers.
location /upstream_list {
upstream_show;
}
curl http://127.0.0.1:8500/upstream_list?test;
curl http://127.0.0.1:8500/upstream_list;
show all upstreams.
Consul_interface
Data can be taken from key/value store or service catalog. In the first case parameter upsync_type of directive must be consul. For example
upsync 127.0.0.1:8500/v1/kv/upstreams/test upsync_timeout=6m upsync_interval=500ms upsync_type=consul strong_dependency=off;
In the second case it must be consul_services.
upsync 127.0.0.1:8500/v1/catalog/service/test upsync_timeout=6m upsync_interval=500ms upsync_type=consul_services strong_dependency=off;
In the third case, it must be consul_health:
upsync 127.0.0.1:8500/v1/health/service/test upsync_timeout=6m upsync_interval=500ms upsync_type=consul_health strong_dependency=off;
Services with failing health checks are marked as down with the health api.
You can add or delete backend server through consul_ui or http_interface. Below are examples for key/value store.
http_interface example:
- add
curl -X PUT http://$consul_ip:$port/v1/kv/upstreams/$upstream_name/$backend_ip:$backend_port
default: weight=1 max_fails=2 fail_timeout=10 down=0 backup=0;
curl -X PUT -d "{\"weight\":1, \"max_fails\":2, \"fail_timeout\":10}" http://$consul_ip:$port/v1/kv/$dir1/$upstream_name/$backend_ip:$backend_port
or
curl -X PUT -d '{"weight":1, "max_fails":2, "fail_timeout":10}' http://$consul_ip:$port/v1/kv/$dir1/$upstream_name/$backend_ip:$backend_port
value support json format.
- delete
curl -X DELETE http://$consul_ip:$port/v1/kv/upstreams/$upstream_name/$backend_ip:$backend_port
- adjust-weight
curl -X PUT -d "{\"weight\":2, \"max_fails\":2, \"fail_timeout\":10}" http://$consul_ip:$port/v1/kv/$dir1/$upstream_name/$backend_ip:$backend_port
or
curl -X PUT -d '{"weight":2, "max_fails":2, "fail_timeout":10}' http://$consul_ip:$port/v1/kv/$dir1/$upstream_name/$backend_ip:$backend_port
- mark server-down
curl -X PUT -d "{\"weight\":2, \"max_fails\":2, \"fail_timeout\":10, \"down\":1}" http://$consul_ip:$port/v1/kv/$dir1/$upstream_name/$backend_ip:$backend_port
or
curl -X PUT -d '{"weight":2, "max_fails":2, "fail_timeout":10, "down":1}' http://$consul_ip:$port/v1/kv/$dir1/$upstream_name/$backend_ip:$backend_port
- check
curl http://$consul_ip:$port/v1/kv/upstreams/$upstream_name?recurse
Etcd_interface
you can add or delete backend server through http_interface.
mainly like etcd, http_interface example:
- add
curl -X PUT http://$etcd_ip:$port/v2/keys/upstreams/$upstream_name/$backend_ip:$backend_port
default: weight=1 max_fails=2 fail_timeout=10 down=0 backup=0;
curl -X PUT -d value="{\"weight\":1, \"max_fails\":2, \"fail_timeout\":10}" http://$etcd_ip:$port/v2/keys/$dir1/$upstream_name/$backend_ip:$backend_port
value support json format.
- delete
curl -X DELETE http://$etcd_ip:$port/v2/keys/upstreams/$upstream_name/$backend_ip:$backend_port
- adjust-weight
curl -X PUT -d "{\"weight\":2, \"max_fails\":2, \"fail_timeout\":10}" http://$etcd_ip:$port/v2/keys/$dir1/$upstream_name/$backend_ip:$backend_port
- mark server-down
curl -X PUT -d value="{\"weight\":2, \"max_fails\":2, \"fail_timeout\":10, \"down\":1}" http://$etcd_ip:$port/v2/keys/$dir1/$upstream_name/$backend_ip:$backend_port
- check
curl http://$etcd_ip:$port/v2/keys/upstreams/$upstream_name
Check_module
check module support.
check-conf:
http {
upstream test {
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;
check interval=1000 rise=2 fall=2 timeout=3000 type=http default_down=false;
check_http_send "HEAD / HTTP/1.0\r\n\r\n";
check_http_expect_alive http_2xx http_3xx;
}
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;
}
location = /upstream_status {
check_status;
access_log off;
}
}
}
TODO
- support zookeeper and so on
Compatibility
Master branch is compatible with nginx-1.9.8+.
The branch of nginx-upsync-1.8.x is compatible with Nginx-1.8.x and with tengine-2.2.0.
Installation
This module can be used independently, can be downloadGithub.
Grab the nginx source code from nginx.org, for example, the version 1.8.0 (see nginx compatibility), and then build the source with this module:
wget 'http://nginx.org/download/nginx-1.8.0.tar.gz'
tar -xzvf nginx-1.8.0.tar.gz
cd nginx-1.8.0/
./configure --add-module=/path/to/nginx-upsync-module
make
make install
if you support nginx-upstream-check-module
patch -p1 < /path/to/nginx-upstream-check-module/check_1.7.5+.patch
./configure --add-module=/path/to/nginx-upstream-check-module --add-module=/path/to/nginx-upsync-module
make
make install
Code style
Code style is mainly based on style
Author
Xiaokai Wang (王晓开) xiaokai.wang@live.com, Weibo Inc.
Copyright and License
This README template copy from agentzh.
This module is licensed under the BSD license.
Copyright (C) 2014 by Xiaokai Wang xiaokai.wang@live.com/xiaokai.wang@live.com
All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
-
Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
-
Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
see also
- the nginx_upstream_check_module: https://github.com/alibaba/tengine/blob/master/src/http/ngx_http_upstream_check_module.c
- the nginx_upstream_check_module patch: https://github.com/yaoweibin/nginx_upstream_check_module
- or based on https://github.com/xiaokai-wang/nginx_upstream_check_module
source dependency
- Cjson: https://github.com/kbranigan/cJSON
- http-parser: https://github.com/nodejs/http-parser
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