nginx作為php站點的負載平衡實踐

我負責的一個lamp應用，需要提高高可用性，所以選擇nginx作為負載平衡的工具。
nginx需要修改一下nginx.conf配置：

<code>upstream qss {
     <span>82</span>         server <span>10.46</span><span>.194</span><span>.17</span>:<span>8088</span> weight<span>=</span><span>5</span>;
     <span>83</span>         server <span>10.46</span><span>.192</span><span>.41</span>:<span>8080</span> weight<span>=</span><span>5</span>;
     <span>84</span>     }
     <span>85</span><span>86</span>     server {
     <span>87</span>         listen <span>8079</span>;
     <span>88</span>         server_name cq01<span>-tdw</span><span>-bfe28</span><span>.</span>cq01<span>.</span>baidu<span>.</span>com;
     <span>89</span>         underscores_in_headers <span>on</span>;
     <span>90</span>         ignore_invalid_headers off;
     <span>91</span><span>92</span>         location <span>/</span> {
     <span>93</span>             proxy_set_header Host <span>$host</span>;
     <span>94</span>             proxy_set_header X<span>-Real</span><span>-IP</span><span>$remote_addr</span>;
     <span>95</span>             proxy_set_header X<span>-Forwarded</span><span>-For</span><span>$proxy_add_x_forwarded_for</span>;
     <span>96</span>             proxy_pass http:<span>//qss;</span><span>97</span>         }</code>

其中，underscores_in_headers on的意思是包含下劃線的header字段被認為是合法的，如果header中有下劃線字段，一定要設置這個，否則會在nginx的error_log中提示錯誤。

另外，站點是有session的，所以各個php模組中應該將session共享起來，可以修改php.ini檔案的配置，之前是保存在tmp的檔案中，現在，可以保存在memcached中：

<code><span>732</span> extension_dir = <span>"/home/qec/vlamp/build/php/output/lib/php/extensions/no-debug-non-zts-20100525/"</span><span>733</span> extension = memcache<span>.so</span><span>1365</span> [Session]
   <span>1366</span><span>; Handler used to store/retrieve data.</span><span>1367</span><span>; http://php.net/session.save-handler</span><span>1368</span><span>; session.save_handler = files</span><span>1369</span> session<span>.save</span>_handler = memcache
   <span>1370</span> memcache<span>.hash</span>_strategy = <span>"consistent"</span><span>1371</span> session<span>.save</span>_path = <span>"tcp://10.216.122.21:11211"</span></code>

然後，就可以了。

以上就介紹了nginx作為php網站的負載平衡實踐，包含了面向的內容，希望對PHP教學有興趣的朋友有幫助。