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348 lines
11 KiB
348 lines
11 KiB
Name
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nginx_http_upstream_check_module - support upstream health check with
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Nginx
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Synopsis
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http {
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upstream cluster {
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# simple round-robin
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server 192.168.0.1:80;
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server 192.168.0.2:80;
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check interval=5000 rise=1 fall=3 timeout=4000;
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#check interval=3000 rise=2 fall=5 timeout=1000 type=ssl_hello;
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#check interval=3000 rise=2 fall=5 timeout=1000 type=http;
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#check_http_send "HEAD / HTTP/1.0\r\n\r\n";
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#check_http_expect_alive http_2xx http_3xx;
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}
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server {
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listen 80;
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location / {
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proxy_pass http://cluster;
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}
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location /status {
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check_status;
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access_log off;
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allow SOME.IP.ADD.RESS;
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deny all;
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}
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}
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}
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Description
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Add the support of health check with the upstream servers.
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Directives
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check
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syntax: *check interval=milliseconds [fall=count] [rise=count]
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[timeout=milliseconds] [default_down=true|false]
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[type=tcp|http|ssl_hello|mysql|ajp|fastcgi]*
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default: *none, if parameters omitted, default parameters are
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interval=30000 fall=5 rise=2 timeout=1000 default_down=true type=tcp*
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context: *upstream*
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description: Add the health check for the upstream servers.
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The parameters' meanings are:
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* *interval*: the check request's interval time.
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* *fall*(fall_count): After fall_count check failures, the server is
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marked down.
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* *rise*(rise_count): After rise_count check success, the server is
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marked up.
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* *timeout*: the check request's timeout.
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* *default_down*: set initial state of backend server, default is
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down.
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* *port*: specify the check port in the backend servers. It can be
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different with the original servers port. Default the port is 0 and
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it means the same as the original backend server.
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* *type*: the check protocol type:
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1. *tcp* is a simple tcp socket connect and peek one byte.
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2. *ssl_hello* sends a client ssl hello packet and receives the
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server ssl hello packet.
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3. *http* sends a http request packet, receives and parses the http
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response to diagnose if the upstream server is alive.
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4. *mysql* connects to the mysql server, receives the greeting
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response to diagnose if the upstream server is alive.
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5. *ajp* sends a AJP Cping packet, receives and parses the AJP
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Cpong response to diagnose if the upstream server is alive.
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6. *fastcgi* send a fastcgi request, receives and parses the
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fastcgi response to diagnose if the upstream server is alive.
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check_http_send
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syntax: *check_http_send http_packet*
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default: *"GET / HTTP/1.0\r\n\r\n"*
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context: *upstream*
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description: If you set the check type is http, then the check function
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will sends this http packet to check the upstream server.
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check_http_expect_alive
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syntax: *check_http_expect_alive [ http_2xx | http_3xx | http_4xx |
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http_5xx ]*
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default: *http_2xx | http_3xx*
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context: *upstream*
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description: These status codes indicate the upstream server's http
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response is ok, the backend is alive.
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check_keepalive_requests
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syntax: *check_keepalive_requests num*
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default: *check_keepalive_requests 1*
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context: *upstream*
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description: The directive specifies the number of requests sent on a
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connection, the default vaule 1 indicates that nginx will certainly
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close the connection after a request.
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check_fastcgi_param
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Syntax: *check_fastcgi_params parameter value*
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default: see below
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context: *upstream*
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description: If you set the check type is fastcgi, then the check
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function will sends this fastcgi headers to check the upstream server.
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The default directive looks like:
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check_fastcgi_param "REQUEST_METHOD" "GET";
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check_fastcgi_param "REQUEST_URI" "/";
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check_fastcgi_param "SCRIPT_FILENAME" "index.php";
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check_shm_size
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syntax: *check_shm_size size*
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default: *1M*
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context: *http*
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description: Default size is one megabytes. If you check thousands of
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servers, the shared memory for health check may be not enough, you can
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enlarge it with this directive.
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check_status
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syntax: *check_status [html|csv|json]*
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default: *none*
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context: *location*
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description: Display the health checking servers' status by HTTP. This
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directive should be set in the http block.
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You can specify the default display format. The formats can be `html`,
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`csv` or `json`. The default type is `html`. It also supports to specify
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the format by the request argument. Suppose your `check_status` location
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is '/status', the argument of `format` can change the display page's
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format. You can do like this:
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/status?format=html
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/status?format=csv
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/status?format=json
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At present, you can fetch the list of servers with the same status by
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the argument of `status`. For example:
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/status?format=html&status=down
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/status?format=csv&status=up
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Below it's the sample html page:
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<title>Nginx http upstream check status</title>
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<h1>Nginx http upstream check status</h1>
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<h2>Check upstream server number: 1, generation: 3</h2>
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<th>Index</th>
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<th>Upstream</th>
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<th>Name</th>
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<th>Status</th>
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<th>Rise counts</th>
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<th>Fall counts</th>
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<th>Check type</th>
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<th>Check port</th>
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<td>0</td>
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<td>backend</td>
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<td>106.187.48.116:80</td>
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<td>up</td>
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<td>39</td>
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<td>0</td>
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<td>http</td>
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<td>80</td>
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Below it's the sample of csv page:
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0,backend,106.187.48.116:80,up,46,0,http,80
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Below it's the sample of json page:
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{"servers": {
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"total": 1,
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"generation": 3,
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"server": [
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{"index": 0, "upstream": "backend", "name": "106.187.48.116:80", "status": "up", "rise": 58, "fall": 0, "type": "http", "port": 80}
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]
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}}
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Installation
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Download the latest version of the release tarball of this module from
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github (<http://github.com/yaoweibin/nginx_upstream_check_module>)
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Grab the nginx source code from nginx.org (<http://nginx.org/>), for
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example, the version 1.0.14 (see nginx compatibility), and then build
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the source with this module:
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$ wget 'http://nginx.org/download/nginx-1.0.14.tar.gz'
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$ tar -xzvf nginx-1.0.14.tar.gz
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$ cd nginx-1.0.14/
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$ patch -p1 < /path/to/nginx_http_upstream_check_module/check.patch
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$ ./configure --add-module=/path/to/nginx_http_upstream_check_module
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$ make
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$ make install
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Note
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If you use nginx-1.2.1 or nginx-1.3.0, the nginx upstream round robin
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module changed greatly. You should use the patch named
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'check_1.2.1.patch'.
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If you use nginx-1.2.2+ or nginx-1.3.1+, It added the upstream
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least_conn module. You should use the patch named 'check_1.2.2+.patch'.
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If you use nginx-1.2.6+ or nginx-1.3.9+, It adjusted the round robin
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module. You should use the patch named 'check_1.2.6+.patch'.
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If you use nginx-1.5.12+, You should use the patch named
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'check_1.5.12+.patch'.
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If you use nginx-1.7.2+, You should use the patch named
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'check_1.7.2+.patch'.
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The patch just adds the support for the official Round-Robin, Ip_hash
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and least_conn upstream module. But it's easy to expand my module to
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other upstream modules. See the patch for detail.
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If you want to add the support for upstream fair module, you can do it
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like this:
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$ git clone git://github.com/gnosek/nginx-upstream-fair.git
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$ cd nginx-upstream-fair
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$ patch -p2 < /path/to/nginx_http_upstream_check_module/upstream_fair.patch
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$ cd /path/to/nginx-1.0.14
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$ ./configure --add-module=/path/to/nginx_http_upstream_check_module --add-module=/path/to/nginx-upstream-fair-module
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$ make
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$ make install
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If you want to add the support for nginx sticky module, you can do it
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like this:
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$ svn checkout http://nginx-sticky-module.googlecode.com/svn/trunk/ nginx-sticky-module
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$ cd nginx-sticky-module
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$ patch -p0 < /path/to/nginx_http_upstream_check_module/nginx-sticky-module.patch
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$ cd /path/to/nginx-1.0.14
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$ ./configure --add-module=/path/to/nginx_http_upstream_check_module --add-module=/path/to/nginx-sticky-module
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$ make
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$ make install
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Note that, the nginx-sticky-module also needs the original check.patch.
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Compatibility
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* The module version 0.1.5 should be compatibility with 0.7.67+
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* The module version 0.1.8 should be compatibility with Nginx-1.0.14+
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Notes
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TODO
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Known Issues
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Changelogs
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v0.3
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* support keepalive check requests
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* fastcgi check requests
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* json/csv check status page support
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v0.1
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* first release
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Authors
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Weibin Yao(姚伟斌) *yaoweibin at gmail dot com*
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Matthieu Tourne
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Copyright & License
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This README template copy from agentzh (<http://github.com/agentzh>).
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The health check part is borrowed the design of Jack Lindamood's
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healthcheck module healthcheck_nginx_upstreams
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(<http://github.com/cep21/healthcheck_nginx_upstreams>);
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This module is licensed under the BSD license.
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Copyright (C) 2014 by Weibin Yao <yaoweibin@gmail.com>
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Copyright (C) 2010-2014 Alibaba Group Holding Limited
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Copyright (C) 2014 by LiangBin Li
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Copyright (C) 2014 by Zhuo Yuan
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Copyright (C) 2012 by Matthieu Tourne
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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