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隨著公司應用需求的增加，需要不斷的擴展，服務器數量也隨之增加，當服務器數量不斷增加，我們會發現一臺puppetmaster壓力大，解析緩慢，而且時不時出“Timeout”之類的報錯，那這時有什么優化的辦法嗎？我們在Puppet官網上找尋解決方案，發現puppetmaster可以配置多端口，結合WEB代理（推薦輕量級的負載均衡器Nginx），這樣puppetmaster承受能力至少可以提升數倍以上，相當于在很大程度上優化了puppet的處理能力。

1.遵循前面的環境設定，我們這里的服務器環境及軟件版本分別為:

服務器系統：CentOS5.8 x86_64

Ruby版本：ruby-1.8.5

Puppet版本：puppet-2.7.9

Nginx版本：nginx-0.8.46

2.Mongrel安裝

要使用puppet多端口配置，需要指定mongrel類型，默認沒有安裝，需要安裝：

1	`yum` `install` `-yrubygem-mongrel`

3.配置puppetmaster

在/etc/sysconfig/puppetmaster文件末尾添加如下兩行，分別代表多端口、mongrel類型，內容如下所示：

1 2	`PUPPETMASTER_PORTS=(8141 8142 8143 81448145)` `PUPPETMASTER_EXTRA_OPTS="--servertype=mongrel--ssl_client_header=HTTP_X_SSL_SUBJECT"`

4.安裝Nginx服務

安裝之前請確保系統已經安裝pcre-devel正則庫，然后再編譯安裝Nginx，需要添加SSL模塊參數支持，Nginx的安裝過程如下所示：

yum -y install pcre-devel 
cd /usr/local/src
wgethttp://nginx.org/download/nginx-0.8.46.tar.gz 
tar zxvf nginx-0.8.46.tar.gz 
cd nginx-0.8.46 
./configure --prefix=/usr/local/nginx--with-http_ssl_module
make && make install && cd../

添加www用戶組及用戶，命令如下所示：

1 2	`groupadd www` `useradd` `-g www www`

5.我們依據puppet需求來修改配置文件nginx.conf，內容如下所示：

user www; 
worker_processes    8; 
events { 
       worker_connections    65535; 
} 
http { 
       include             mime.types; 
       default_type   application/octet-stream; 
       sendfile                on; 
       tcp_nopush         on; 
       keepalive_timeout    65; 
       #定義puppet客戶端訪問puppet-server端日志格式 
       log_format main '$remote_addr - $remote_user [$time_local]"$request" $request_length $request_time $time_local'
                                                '$status $body_bytes_sent$bytes_sent $connection $msec "$http_referer" '
                                               '"$http_user_agent" $http_x_forwarded_for$upstream_response_time $upstream_addr $upstream_status '; 
       access_log   /usr/local/nginx/logs/access.log   main; 
       upstream puppetmaster { 
                server 127.0.0.1:8141; 
                server 127.0.0.1:8142; 
                server 127.0.0.1:8143; 
                server 127.0.0.1:8144; 
                server 127.0.0.1:8145; 
                } 
       server { 
       listen 8140; 
       root /etc/puppet; 
       ssl on; 
       ssl_session_timeout 5m; 
       #如下為puppetmaster服務器端證書地址 
       ssl_certificate /var/lib/puppet/ssl/certs/server.cn7788.com.pem; 
       ssl_certificate_key/var/lib/puppet/ssl/private_keys/server.cn7788.com.pem; 
       ssl_client_certificate /var/lib/puppet/ssl/ca/ca_crt.pem; 
       ssl_crl /var/lib/puppet/ssl/ca/ca_crl.pem; 
       ssl_verify_client optional; 
       #File sections 
       location /production/file_content/files/ { 
       types { } 
       default_type application/x-raw; 
       #定義puppet推送路徑別名 
       alias /etc/puppet/files/; 
       } 
       # Modules files sections 
       location ~ /production/file_content/modules/.+/ { 
       root /etc/puppet/modules; 
       types { } 
       default_type application/x-raw; 
       rewrite ^/production/file_content/modules/(.+)/(.+)$ /$1/files/$2 break; 
       } 
       location / { 
       ##設置跳轉到puppetmaster負載均衡 
       proxy_pass http://puppetmaster; 
       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; 
       proxy_set_header X-Client-Verify $ssl_client_verify; 
       proxy_set_header X-SSL-Subject $ssl_client_s_dn; 
       proxy_set_header X-SSL-Issuer $ssl_client_i_dn; 
       proxy_buffer_size 10m; 
       proxy_buffers 1024 10m; 
       proxy_busy_buffers_size 10m; 
       proxy_temp_file_write_size 10m; 
       proxy_read_timeout 120; 
    } 
} 
}

6.修改完nginx.conf文件以后，我們要啟動nginx及puppet-server，這時應該如何操作呢？

我們首先關閉puppetmaster進程，然后先啟動nginx，不然nginx是會啟動失敗的，命令如下所示：

1	`/usr/local/nginx/sbin/nginx`

nginx占用puppetmaster默認的8140端口后，我們可以用如下命令來檢查8140端口是否被nginx接管，如下所示：

1	`lsof` `-i:8140`

此命令顯示結果表明8140被nginx進程接管，如下所示：

COMMAND   PID    USER     FD    TYPE DEVICE SIZE/OFF NODE NAME 
nginx    4121    root        6u   IPv4    20668            0t0    TCP *:8140 (LISTEN) 
nginx    4122    www    6u   IPv4    20668            0t0    TCP *:8140 (LISTEN)

我們再啟動puppetmaster，命令如下所示：

1	`service puppetmaster start`

如果ruby版本為1.8.5的話，等會運行puppetmaster會有如下警告，如下所示：

Starting puppetmaster: 
Port: 8141** Ruby version is not up-to-date;loading cgi_multipart_eof_fix 
                                                                                                                                                                                                                                        [        OK        ] 
Port: 8142** Ruby version is notup-to-date; loading cgi_multipart_eof_fix 
                                                                                                                                                                                                                                      [        OK        ] 
Port: 8143** Ruby version is notup-to-date; loading cgi_multipart_eof_fix 
                                                                                                                                                                                                                                        [        OK        ] 
Port: 8144** Ruby version is notup-to-date; loading cgi_multipart_eof_fix 
                                                                                                                                                                                                                                       [        OK        ] 
Port: 8145** Ruby version is notup-to-date; loading cgi_multipart_eof_fix 
                                                                                                                                                                                                                                      [        OK        ]

這段警告值的意思為

1 2	`It's just a warning. Mongrel wants a Rubyversion of at least 1.8.6.` `But it still runs just fine with previousversions. Just ignore the warning.`

Puppet利用Nginx多端口實現負載均衡

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