Puppet利用Nginx多端口实现负载均衡,puppetnginx

Puppet利用Nginx多端口实现负载均衡,puppetnginx

随着公司应用需求的增加，需要不断的扩展，服务器数量也随之增加，当服务器数量不断增加，我们会发现一台puppetmaster压力大，解析缓慢，而且时不时出现“time out”之类的报错，那这时有什么优化的办法吗？我们在Puppet官网上找寻解决方案，发现puppetmaster可以配置多端口，结合WEB代理（推荐Nginx），这样puppetmaster承受能力至少可以提升数倍以上，相当于在很大程度上优化了puppet的处理能力。

1.遵循前面的环境设定，我们这里的服务器环境及软件版本分别为:

服务器系统：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安装

要使用puppet多端口配置，需要指定mongrel类型，默认没有安装，需要安装：

yum install -y rubygem-mongrel

3.配置puppetmaster

在/etc/sysconfig/puppetmaster文件末尾添加如下两行，分别代表多端口、mongrel类型，内容如下所示：

PUPPETMASTER_PORTS=(8141 8142 8143 8144 8145)

PUPPETMASTER_EXTRA_OPTS="--servertype=mongrel --ssl_client_header=HTTP_X_SSL_SUBJECT"

4.安装Nginx服务

安装之前请确保系统已经安装pcre-devel正则库，然后再编译安装Nginx，需要添加SSL模块参数支持，Nginx的安装过程如下所示：

yum -y install pcre-devel

cd /usr/local/src

wget http://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用户组及用户，命令如下所示：

groupadd www

useradd -g www www

5.我们依据puppet需求来修改配置文件nginx.conf，内容如下所示：

user www;

worker_processes8;

events {

worker_connections65535;

}

http {

include mime.types;

default_typeapplication/octet-stream;

sendfileon;

tcp_nopush on;

keepalive_timeout65;

#定义puppet客户端访问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.logmain;

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;

#如下为puppetmaster服务器端证书地址

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;

#定义puppet推送路径别名

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 / {

##设置跳转到puppetmaster负载均衡

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，我们要启动nginx及puppet-server，这时应该如何操作呢？

1.我们首先关闭puppetmaster进程，然后先启动nginx，不然nginx是会启动失败的，命令如下所示：

/usr/local/nginx/sbin/nginx

nginx占用puppetmaster默认的8140端口后，我们可以用如下命令来检查8140端口是否被nginx接管，如下所示：

lsof -i:8140

此命令显示结果表明8140被nginx进程接管，如下所示：

COMMANDPIDUSER FD TYPE DEVICE SIZE/OFF NODE NAME

nginx 4121root6uIPv4206680t0TCP *:8140 (LISTEN)

nginx 4122www6uIPv4206680t0TCP *:8140 (LISTEN)

我们再启动puppetmaster，命令如下所示：

service puppetmaster start

如果ruby版本为1.8.5的话，等会运行puppetmaster会有如下警告，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 not up-to-date; loading cgi_multipart_eof_fix

[OK]

Port: 8143** Ruby version is not up-to-date; loading cgi_multipart_eof_fix

[OK]

Port: 8144** Ruby version is not up-to-date; loading cgi_multipart_eof_fix

[OK]

Port: 8145** Ruby version is not up-to-date; loading cgi_multipart_eof_fix

[OK]

这段警告值的意思为：

It's just a warning. Mongrel wants a Ruby version of at least 1.8.6.

But it still runs just fine with previous versions. Just ignore the warning.

翻译为中文的意思是：

Mongrel需要ruby至少是1.8.6以上的版本，但它仍然在当前版本运行，请忽咯当前警告，为了保证整个puppet运行环境的稳定，我这里选择还是沿用1.8.5版本的ruby.