自动化运维平台puppet的高级应用

一、模板的应用

   到目前为止,资源申报、定义类、声明类等所有功能都只能一个manifest文件中实现,但这却非有效的基于puppet管理IT资源架构的方式。实践中,一般需要把manifest文件分解成易于理解的结构,例如将类文件、配置文件甚至包括后面讲提到的模板文件等分类存放,并且通过某种机制在必要时将他们整合起来。这种机制即成为“模板”,它有助于结构化、层次化的方式使用puppet,而puppet则基于“模块自动装载器”完成模块装载

   从另一个角度来说,模板实际上就是一个按约定的、预定义的机构存放了多个文件或子目录的目录,目录里的这些文件或子目录必须遵循其命名规范。puppet会按照这种规范在特定位置查找所需的模块文件,不过,这些特定目录页可以通过puppet的配置参数modulepath定义

   只要在某模块中定于了一个类,就可以在任何manifest文件中使用它,puppet会自动去查找并装载包含了这个类的定义的manifest文件任意使用它们。于是,基于模块机制的puppet的主manifest文件就可以变得很小,也更易懂并能基于策略进行定制

   模块目录的结构

   在puppet中,模块本身用一个目录来表示,其需要存放于puppet的modulepath参数所定义的目录中,如/etc/puppet/modules。模块目录名称必须与模块名称相同,需要遵循特定的组织结构

   MODULE NAME

       manifests

           init.pp

       files

       templates

       lib

       tests

       spec

   MODULE NAME:模块名称,也即模块目录名称:模块只能以小写字母开头,可以包含小写字母、数字和下划线,但不能使用“main”和“settings”作为模块名

       manifests目录:包含当前模块的所有manifest文件:每个manifest文件包含了一个类或一个定义的类型,此文件访问路径格式为“Modulename::[SubDirectoryName::]ManifestFileName”。

           init.pp:只能包含一个单独的类定义,且类的名称必须与模块名称相同

       files目录:包含了一组静态的文件,这些文件可被站点下载使用:每个文件的访问路径都遵循puppet:///modules/MODELE_NAME/filename路径格式

       lib目录:插件目录,常用于自定义fact及自定义资源类型等

       templates目录:存储了manifest用到的模板文件,其访问路径遵循template(‘ModulesName/TemplateName’)格式,后缀名应该为.erb,关于模板文件详细信息,后文有介绍

       tests目录:当前模板的使用帮助或使用范例文件,类似如何声明当前模板中的类及定义的类型等

       spec目录:类似于tests目录的功能,只不过,其是为lib目录定义的各插件提供使用范例的

[root@node1 ~]# mkdir -p /etc/puppet/modules/nginx/{manifests,files,templates,lib}
[root@node1 ~]# cd /etc/puppet/modules/nginx/
[root@node1 nginx]# cd manifests/
[root@node1 manifests]# vi init.pp
class nginx {
        package {'nginx':
                ensure => installed,
                name  => nginx,
        }
}
[root@node1 manifests]# vi web.pp
class nginx::web inherits nginx {
        service {'nginx':
                ensure => true,
                enable => true,
                name   => nginx,
                require => Package['nginx'],
        }
        file{'web.conf':
                ensure =>file,
                source => "puppet:///modules/nginx/web.conf",
                path   => '/etc/nginx/nginx.conf',
                notify => Service['nginx'],
                require => Package['nginx']
        }
}
[root@node1 manifests]# puppet apply -e 'include nginx::web'
notice: /Stage[main]/Nginx/Package[nginx]/ensure: created
notice: /Stage[main]/Nginx::Web/File[web.conf]/content: content changed '{md5}d9dfc198c249bb4ac341198a752b9458' to '{md5}33d2119b71f717ef4b981e9364530a39'
notice: /Stage[main]/Nginx::Web/Service[nginx]/ensure: ensure changed 'stopped' to 'running'
notice: Finished catalog run in 8.07 seconds
[root@node1 manifests]# grep work /etc/nginx/nginx.conf
worker_processes  2;

   准备nginx配置文件,并有意修改nginx的配置文件

[root@node1 ~]# cp /etc/nginx/nginx.conf /etc/puppet/modules/nginx/files/web.conf
[root@node1 ~]# grep worker_processes /etc/puppet/modules/nginx/files/web.conf
worker_processes  2;

    可以看到我们的配置执行成功

   使用模板配置文件

       语法:<%= Ruby Expression %>:替代为表达式的值,在使用表达式时应该使用@引用

             <% ruby code %>:仅执行代码,不做任何替换,常用于条件判断或循环语句、设定变量以及在输出之前对数据进行处理

             <%# commit %>:注释信息

             <%%: 输出<%

             %%>:输出%>

   如上面的案例,在使用模板后

[root@node1 manifests]# cp /etc/puppet/modules/nginx/files/web.conf /etc/puppet/modules/nginx/templates/conf.erb
[root@node1 manifests]# grep work /etc/puppet/modules/nginx/templates/conf.erb
worker_processes  <%= @processorcount %>;
表示nginx的线程数按照cpu的个数来启动
类应该改为如下所示
class nginx::web inherits nginx {
        service {'nginx':
                ensure => true,
                enable => true,
                name   => nginx,
                require => Package['nginx'],
        }
        file{'web.conf':
                ensure =>file,
                content =>template('nginx/conf.erb'),
                path   => '/etc/nginx/nginx.conf',
                notify => Service['nginx'],
                require => Package['nginx']
        }
}
[root@node1 manifests]# puppet apply -e 'include nginx::web'
notice: /Stage[main]/Nginx/Package[nginx]/ensure: created
notice: /Stage[main]/Nginx::Web/Service[nginx]/ensure: ensure changed 'stopped' to 'running'
notice: Finished catalog run in 8.25 seconds
[root@node1 manifests]# grep work /etc/nginx/nginx.conf
worker_processes  1;

二、master/agent

   应用场景:

       统一资源管理软件

       统一配置系统优化参数

       定期检测服务器是否运行

       主机上的软件配置合理的属性

   1.安装

     前提:配置实用epel的yum源,而后使用yum命令安装即可

     环境规划

       192.168.1.201 puppet-server端

       192.168.1.202 puppet-agent端

    安装部署puppet服务器端

[root@node1 manifests]# yum install puppet-server

    安装部署puppet客户端  

[root@node2 ~]# yum install puppet -y

   2.解析双方主机

     解析双方主机,可以使用DNS和hosts文件,由于本处实验的缘故,故使用的为/etc/hosts文件来解析双方主机

     建议的主机命名方式:

       角色名-运营商-机房名-机器ip.域名

[root@node1 manifests]# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
172.16.0.1  server.magelinux.com server
192.168.1.201 node1.wangfeng7399.com node1
192.168.1.202 node2.wangfeng7399.com node2
192.168.1.203 node3.wangfeng7399.com node3
192.168.1.204 node4.wangfeng7399.com node4

   3.启动

       1)启动puppet服务器端

       收起启动puppet守护进程时,其会自动进行运行环境的初始化,例如创建一个本地CA及服务器端相关的证书和密钥等。初始化操作完成后,puppet就会监听指定的套接字并等待客户端的连接请求。默认情况下,其证书和密钥等文件位于/var/lib/puppet/ssl目录中

       出于调试的目的,建议首次启动puppet服务进程可以以非守护进程方式进行,并让其输出详细信息以便于观察初始化过程,如下所示,其逐步展示了创建本地主叫向CA申请证书、获得证书以及CA移除证书签署请求的过程等,而后启动服务进程并准备接受各agent端的连接请求

[root@node1 manifests]# puppet master --no-daemonize --debug
[root@node1 manifests]# puppet master --no-daemonize --debug
debug: Failed to load library 'rubygems' for feature 'rubygems'
debug: Puppet::Type::User::ProviderDirectoryservice: file /usr/bin/dscl does not exist
debug: Puppet::Type::User::ProviderPw: file pw does not exist
debug: Puppet::Type::User::ProviderUser_role_add: file roledel does not exist
debug: Puppet::Type::User::ProviderLdap: true value when expecting false
debug: /File[/var/lib/puppet/facts]: Autorequiring File[/var/lib/puppet]
debug: /File[/var/lib/puppet/ssl/certs/ca.pem]: Autorequiring File[/var/lib/puppet/ssl/certs]
debug: /File[/etc/puppet/manifests]: Autorequiring File[/etc/puppet]
debug: /File[/var/lib/puppet/bucket]: Autorequiring File[/var/lib/puppet]
debug: /File[/var/lib/puppet/ssl/private_keys/node1.wangfeng7399.com.pem]: Autorequiring File[/var/lib/puppet/ssl/private_keys]
debug: /File[/var/lib/puppet/ssl/private_keys]: Autorequiring File[/var/lib/puppet/ssl]
debug: /File[/var/lib/puppet/server_data]: Autorequiring File[/var/lib/puppet]
debug: /File[/var/lib/puppet/rrd]: Autorequiring File[/var/lib/puppet]
debug: /File[/etc/puppet/puppet.conf]: Autorequiring File[/etc/puppet]
debug: /File[/var/lib/puppet/ssl/crl.pem]: Autorequiring File[/var/lib/puppet/ssl]
debug: /File[/etc/puppet/auth.conf]: Autorequiring File[/etc/puppet]
debug: /File[/var/lib/puppet/ssl/private]: Autorequiring File[/var/lib/puppet/ssl]
debug: /File[/var/lib/puppet/ssl/public_keys/node1.wangfeng7399.com.pem]: Autorequiring File[/var/lib/puppet/ssl/public_keys]
debug: /File[/etc/puppet/fileserver.conf]: Autorequiring File[/etc/puppet]
debug: /File[/var/lib/puppet/ssl/certs/node1.wangfeng7399.com.pem]: Autorequiring File[/var/lib/puppet/ssl/certs]
debug: /File[/var/lib/puppet/yaml]: Autorequiring File[/var/lib/puppet]
debug: /File[/var/lib/puppet/state]: Autorequiring File[/var/lib/puppet]
debug: /File[/var/lib/puppet/lib]: Autorequiring File[/var/lib/puppet]
debug: /File[/var/lib/puppet/ssl]: Autorequiring File[/var/lib/puppet]
debug: /File[/var/log/puppet/masterhttp.log]: Autorequiring File[/var/log/puppet]
debug: /File[/var/lib/puppet/ssl/certificate_requests]: Autorequiring File[/var/lib/puppet/ssl]
debug: /File[/var/lib/puppet/ssl/certs]: Autorequiring File[/var/lib/puppet/ssl]
debug: /File[/var/lib/puppet/reports]: Autorequiring File[/var/lib/puppet]
debug: /File[/var/lib/puppet/ssl/public_keys]: Autorequiring File[/var/lib/puppet/ssl]
debug: /File[/var/lib/puppet/ssl/public_keys/node1.wangfeng7399.com.pem]/mode: mode changed '0640' to '0644'
debug: /File[/var/lib/puppet/ssl/private_keys/node1.wangfeng7399.com.pem]/mode: mode changed '0640' to '0600'
debug: /File[/var/lib/puppet/ssl/certs/node1.wangfeng7399.com.pem]/mode: mode changed '0640' to '0644'
debug: Finishing transaction 70240930059560
debug: /File[/var/lib/puppet/ssl/ca/serial]: Autorequiring File[/var/lib/puppet/ssl/ca]
debug: /File[/var/lib/puppet/ssl/ca/inventory.txt]: Autorequiring File[/var/lib/puppet/ssl/ca]
debug: /File[/var/lib/puppet/ssl/ca/private]: Autorequiring File[/var/lib/puppet/ssl/ca]
debug: /File[/var/lib/puppet/ssl/ca/private/ca.pass]: Autorequiring File[/var/lib/puppet/ssl/ca/private]
debug: /File[/var/lib/puppet/ssl/ca/signed]: Autorequiring File[/var/lib/puppet/ssl/ca]
debug: /File[/var/lib/puppet/ssl/ca/requests]: Autorequiring File[/var/lib/puppet/ssl/ca]
debug: /File[/var/lib/puppet/ssl/ca/ca_key.pem]: Autorequiring File[/var/lib/puppet/ssl/ca]
debug: /File[/var/lib/puppet/ssl/ca/ca_pub.pem]: Autorequiring File[/var/lib/puppet/ssl/ca]
debug: /File[/var/lib/puppet/ssl/ca/ca_crt.pem]: Autorequiring File[/var/lib/puppet/ssl/ca]
debug: /File[/var/lib/puppet/ssl/ca/ca_crl.pem]: Autorequiring File[/var/lib/puppet/ssl/ca]
debug: /File[/var/lib/puppet/ssl/ca/ca_crt.pem]/mode: mode changed '0640' to '0660'
debug: /File[/var/lib/puppet/ssl/ca/ca_crl.pem]/mode: mode changed '0644' to '0664'
debug: /File[/var/lib/puppet/ssl/ca/ca_key.pem]/mode: mode changed '0640' to '0660'
debug: /File[/var/lib/puppet/ssl/ca/private/ca.pass]/mode: mode changed '0640' to '0660'
debug: Finishing transaction 70240928434340
debug: Using cached certificate for ca
debug: Using cached certificate for ca
debug: Using cached certificate for node1.wangfeng7399.com
notice: Starting Puppet master version 2.7.25

   使用puppet master --genconfig可以查看服务器端的配置信息,建议将其输出到/etc/puppet/puppet.conf中

[root@node1 ~]# puppet master --genconfig >> /etc/puppet/puppet.conf

   注意:如果此前曾以其主机名或各种原因启动过puppet客户端过程并完成过初始化,其证书文件将无法符合本次启动的需要:此时,需要先情况/var/lib/puppet/ssl目录方可完成后续的初始化操作

   如上述的测试启动没有问题,可终止当前的启动后将其以守护进程方式启动

[root@node1 ~]# service puppetmaster start
Starting puppetmaster:                                     [  OK  ]
[root@node1 ~]# chkconfig puppetmaster on

   2)启动puppet客户端

      puppet agent在首次启动时,会想起指定的puppet server申请证书,并完成后续连接请求,同样的理由,处于测试的目的,接入当前puppet集群中的首个agent节点可以以非守护进程的方式运行,以观察其初始化过程    

[root@node2 ~]# puppet agent --server=node1.wangfeng7399.com --no-daemonize --debug
info: Creating a new SSL key for node2.wangfeng7399.com
info: Caching certificate for ca
info: Creating a new SSL certificate request for node2.wangfeng7399.com
info: Certificate Request fingerprint (md5): BC:B2:36:9F:B5:78:CD:60:1E:72:9A:D5:88:DE:4B:57

   此时,在puppet服务器端使用puppet cert命令管理客户端的证书请求,其--list选项能够查看等待签署证书的客户端列表,而--sign选项可用于为指定节点签署证书,如果要一次性地多个节点证书申请进行签署可以使用--all选项

[root@node1 ~]# puppet cert --list
  "node2.wangfeng7399.com" (BC:B2:36:9F:B5:78:CD:60:1E:72:9A:D5:88:DE:4B:57)
[root@node1 ~]# puppet cert --sign node2.wangfeng7399.com
notice: Signed certificate request for node2.wangfeng7399.com
notice: Removing file Puppet::SSL::CertificateRequest node2.wangfeng7399.com at '/var/lib/puppet/ssl/ca/requests/node2.wangfeng7399.com.pem'

   一旦agent节点收到签署过的证书,其将会显示如下信息

info: Caching certificate for node2.wangfeng7399.com
notice: Starting Puppet client version 2.7.25

   确保上述agent相关操作不存在问题后,便可以将--server选项指定的信息存储与agent的配置文件中,并以服务的方式启动puppet agent了。其配置文件为/etc/puppet/puppet.conf,配置完整既可以期待能够puppet

[root@node2 ~]# echo "server=node1.wangfeng7399.com" >> /etc/puppet/puppet.conf
[root@node2 ~]# service puppet start
Starting puppet:                                           [  OK  ]
[root@node2 ~]# chkconfig puppet on

   4.授权访问

    在puppet服务器端的/etc/puppet/manifests/中创建site.pp,在master/agent时,所有节点清单文件入口文件为site.pp

node node2.wangfeng7399.com {
        incldue nginx::web
}

   建议:一类节点使用一个清单文件,所有清单文件都在site.pp中使用improt包含进来,清单文件修改后应重启文件

   5.自动签发证书

    可以设置master自动签发所有的证书,我们只需要在/etc/puppet目录下创建autosign.conf文件即可

[root@node1 ~]# echo "*.wangfeng7399.com" > /etc/puppet/autosign.conf

   这样就会对所有来自magedu.conf的机器的请求自动签署证书

   6.puppet kick功能实现

   puppet客户端默认每30分钟很服务器通讯一次,但是有时,我们希望服务器能够给客户端紧急推送一些人物,于是就有了puppet kick(puppet 2.6以前叫puppetrun)

   1)编辑客户端配置文件/etc/puppet/puppet.conf在[agent]端中添加如下

[root@node2 ~]# echo "listen=true" >> /etc/puppet/puppet.conf
[root@node2 puppet]# ss -tnl
State       Recv-Q Send-Q             Local Address:Port               Peer Address:Port
LISTEN      0      5                              *:8139                          *:*

   2)在客户端编辑或创建新文件/etc/puppet/namespaceauth.conf,包含下面内容

[puppetrunner]
allow *.wangfeng7399.com

    3)在客户端编辑文件auth.conf,添加如下内容

path    /run
  method  save
  auth    any
  allow   *.wangfeng7399.com

   4)推送方法,在服务器端运行命令

[root@node1 puppet]# puppet kick -p 10 node2.wangfeng7399.com
Triggering node2.wangfeng7399.com
Getting status
status is success
node2.wangfeng7399.com finished with exit code 0
Finished

   查看node2

[root@node2 puppet]# rpm -q nginx
nginx-1.0.15-5.el6.x86_64
[root@node2 puppet]# grep work /etc/nginx/nginx.conf
worker_processes  1;

   错误信息,惨痛的教训,客户端一致在报这个错误

err: Could not retrieve catalog from remote server: SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed: [certificate is not yet valid for /CN=Puppet CA: node1.wangfeng7399.com]
warning: Not using cache on failed catalog
err: Could not retrieve catalog; skipping run
debug: report supports formats: b64_zlib_yaml pson raw yaml; using pson
err: Could not send report: SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed: [certificate is not yet valid for /CN=Puppet CA: node1.wangfeng7399.com]

   解决方法:

   两台服务器需要时间同步

   7.安装配置puppet-dashboard    

   1)安装

[root@node1 puppet]# rpm -ivh http://yum.puppetlabs.com/puppetlabs-release-el-6.noarch.rpm //安装官方通过的yum仓库
[root@node1 puppet]# yum install puppet-dashboard -y
[root@node1 puppet]# yum install mysql-server mysql -y

   2)数据库授权

mysql> create database dashboard character set utf8;
Query OK, 1 row affected (0.00 sec)
mysql> grant all on dashboard.* to 'dbuser'@'192.168.1.%' identified by 'wangfeng7399';
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

   3)修改配置文件,dashboard的配置文件为/usr/share/puppet-dashboard/config/database.yml,修改如下参数    

production:
  host:192.168.1.201
  database: dashboard
  username: dbuser
  password:wangfeng7399
  encoding: utf8
  adapter: mysql

   为dashboard导入依赖的数据表

[root@node1 config]# gem install rake
[root@node1 puppet]# cd /usr/share/puppet-dashboard/config
[root@node1 config]# rake gems::refresh_specs
[root@node1 config]# rake RAILS_ENV=production db:migrate

   启动服务

[root@node1 config]# service puppet-dashboard start
Starting Puppet Dashboard: => Booting WEBrick
=> Rails 2.3.17 application starting on http://0.0.0.0:3000
                                                           [  OK  ]

   4)配置puppet服务器和客户端

     服务器端配置

     在puppetmaster的配置文件中添加如下内容

    reports = store, http
    reporturl = http://192.168.1.201:3000/reports/upload
在[master]中添加

     客户端配置    

report=true
在[agent]中添加

   配置完成后重启puppet

   5)测试

   wKiom1N3ymDjIlBlAAKgVwMFy8Y726.jpg

   还可以在页面中添加节点和类文件

   终于完成了,一个时间不同步弄了2小时才找出错误。

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